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Add: bibcode, authors 1-1. Removed URL that duplicated identifier. Removed parameters. Some additions/deletions were parameter name changes. | Use this bot. Report bugs. | Suggested by Abductive | Category:Carina Nebula | #UCB_Category 13/19
 
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{{Short description|Star system in the constellation Carina}}
{{Starbox short |
{{Update|date=August 2024}}
{{Starbox begin
| name=QZ Carinae
| name=QZ Carinae
}}
| epoch=[[J2000.0]]
{{Starbox image
| image =
{{Location mark
|image=The spectacular star-forming Carina Nebula imaged by the VLT Survey Telescope.jpg
|alt=
|label=QZ Carinae
|background=
|position=right
|width=300
|x=591
|y=661
|float=center
|mark=Cercle rouge 100%.svg
|mark_width=12
|mark_link=QZ Carinae
}}
| caption = QZ Carinae (circled) in the Carina Nebula
| credit = ESO
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|10|44|22.91114}}<ref name=hipparcos>{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|last1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 |s2cid=18759600}}</ref>
| dec={{DEC|&minus;59|59|35.9550}}<ref name=hipparcos/>
| appmag_v =6.24<ref name=ducati/> {{nowrap|(6.16 - 6.49<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=02025|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|display-authors=etal}}</ref>)}}
| constell=[[Carina (constellation)|Carina]]
| constell=[[Carina (constellation)|Carina]]
| ra=10<sup>h</sup>44<sup>m</sup>22.9<sup>s</sup> <ref name=SIMBAD>{{cite web |url =http://simbad.u-strasbg.fr/simbad/sim-id?Ident=QZ+Car&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |title =QZ Carinae |work = SIMBAD Astronomical Database | publisher = Centre de Données astronomiques de Strasbourg|accessdate =12 March 2014}}</ref>
| dec=&minus;59°59′35.9550″<ref name=SIMBAD/>
| spectral=O9.7I+ B2V, O8 III+O9V<ref name="parkin11"/>
| appmag_v = 6.16 - 6.49<ref name=AAVSOQZ/>
| dist_ly=
| dist_pc=2300
| names=[[Henry Draper Catalogue|HD]]&nbsp;93206, [[Hipparcos catalogue|HIP]]&nbsp;52526
}}
}}
{{Starbox character
'''QZ Carinae''' is a multiple [[star]] in the [[constellation]] [[Carina (constellation)|Carina]]. It is approximately 2300 [[parsec]]s (7500 [[light-year]]s) from [[Earth]].<ref name="parkin11">{{cite journal|last= Parkin, E. R.; Broos, P. S.; Townsley, L. K.; Pittard, J. M.; Moffat, A. F. J.; Nazé, Y.; Rauw, G.; Oskinova, L. M.; Waldron, W. L.|date=2011|title=X-ray emission from the double-binary OB-star system QZ Car (HD 93206)|journal=The Astrophysical Journal Supplement|volume=194|issue=1|pages=article id. 8, 11 pp.|url=http://iopscience.iop.org/0067-0049/194/1/8/article|bibcode=2011ApJS..194....8P}}</ref> A [[Beta Lyrae variable]] eclipsing system, its [[apparent magnitude]] ranging from +6.16 to +6.49 with a period of 5.9 days.<ref name=AAVSOQZ>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=6087 |title=QZ Carinae |last=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=12 March 2014}}</ref> Stars of this brightness are just visible to the unaided eye in semi-rural settings on the edges of cities.<ref>{{cite web|url=http://www.skyandtelescope.com/resources/darksky/3304011.html?page=1&c=y|title=The Bortle Dark-Sky Scale|last=Bortle|first=John E.|date=February 2001|work=[[Sky & Telescope]]|publisher=Sky Publishing Corporation|accessdate=20 February 2013}}</ref>
| class='''A1''': O9.7I<br/>'''A2''': B2V<br/>'''B1''': O8III<br/>'''B2''': O9V<ref name=parkin>{{cite journal|display-authors= 4|author= Parkin, E. R.|author2= Broos, P. S.|author3= Townsley, L. K.|author4= Pittard, J. M.|author5= Moffat, A. F. J.|author6= Nazé, Y.|author7= Rauw, G.|author8= Oskinova, L. M.|author9= Waldron, W. L.|date=2011|title=X-ray emission from the double-binary OB-star system QZ Car (HD 93206)|journal=The Astrophysical Journal Supplement|volume=194|issue=1|pages=article id. 8, 11 pp|bibcode=2011ApJS..194....8P|arxiv = 1103.0794 |doi = 10.1088/0067-0049/194/1/8 |s2cid= 119292907}}</ref>
| b-v=+0.13<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|pages=0|last1=Ducati|first1=J. R.|year=2002}}</ref>
| u-b=&minus;0.84<ref name=ducati/>
| variable=[[Beta Lyrae variable|β Lyr]]<ref name=gcvs/>
|type=[[Blue supergiant]] (A1)<br>[[Main sequence]] (A2 and B2)<br>[[Blue giant]] (B1)}}
{{Starbox astrometry
| radial_v=&minus;2.80<ref name="PourbaixTokovinin2004">{{cite journal|last1=Pourbaix|first1=D.|last2=Tokovinin|first2=A. A.|last3=Batten|first3=A. H.|last4=Fekel|first4=F. C.|last5=Hartkopf|first5=W. I.|last6=Levato|first6=H.|last7=Morrell|first7=N. I.|author-link7=Nidia Morrell|last8=Torres|first8=G.|last9=Udry|first9=S.|title=SB9: The ninth catalogue of spectroscopic binary orbits|journal=Astronomy and Astrophysics|volume=424|issue=2|year=2004|pages=727–732|issn=0004-6361|doi=10.1051/0004-6361:20041213|bibcode=2004A&A...424..727P|arxiv = astro-ph/0406573 |s2cid=119387088}}</ref>
| prop_mo_ra=&minus;6.63<ref name=hipparcos/>
| prop_mo_dec=2.48<ref name=hipparcos/>
| parallax=1.67
| p_error=0.40
| parallax_footnote=<ref name=hipparcos/>
| dist_pc=2,300<ref name=parkin/>
| absmag_v=
}}
{{Starbox orbit
| reference = <ref name=parkin/>
| primary = A
| name = B
| period = ~25.4
| period_unitless =
| axis =
| axis_unitless = ~35 AU
| eccentricity = 0.0
| inclination = 60
| node = <!--Longitude of node (in degrees)-->
| periastron = <!--Periastron epoch-->
| periarg = <!--Argument of periastron (in degrees), secondary -->
| periarg_primary = <!--Argument of periastron (in degrees), primary -->
| k1 = <!-- Velocity semi-amplitude (SB1, or primary in SB2), in km/s -->
| k2 = <!-- Velocity semi-amplitude (secondary in SB2), in km/s -->
}}
{{Starbox orbit|no_heading=y
| reference = <ref name=parkin/>
| primary = A1
| name = A2
| period =
| period_unitless = 20.72 days
| axis =
| axis_unitless = {{solar radius|116}}
| eccentricity = 0.34
| inclination = 60
| node = <!--Longitude of node (in degrees)-->
| periastron = <!--Periastron epoch-->
| periarg = 141
| periarg_primary = <!--Argument of periastron (in degrees), primary -->
| k1 = <!-- Velocity semi-amplitude (SB1, or primary in SB2), in km/s -->
| k2 = <!-- Velocity semi-amplitude (secondary in SB2), in km/s -->
}}
{{Starbox orbit|no_heading=y
| reference = <ref name=parkin/>
| primary = B1
| name = B2
| period =
| period_unitless = 5.999 days
| axis =
| axis_unitless = {{solar radius|49}}
| eccentricity = 0.1
| inclination = 86
| node = <!--Longitude of node (in degrees)-->
| periastron = <!--Periastron epoch-->
| periarg = ~20
| periarg_primary = <!--Argument of periastron (in degrees), primary -->
| k1 = <!-- Velocity semi-amplitude (SB1, or primary in SB2), in km/s -->
| k2 = <!-- Velocity semi-amplitude (secondary in SB2), in km/s -->
}}
{{Starbox detail
| component1=A1
| mass=69.8<ref name=Broz>{{cite journal|doi=10.1051/0004-6361/202243596 |bibcode=2022A&A...666A..24B |arxiv=2206.12160 |title=Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ. II. N-body model |year=2022 |last1=Brož |first1=M. |last2=Harmanec |first2=P. |last3=Zasche |first3=P. |last4=Catalan-Hurtado |first4=R. |last5=Barlow |first5=B. N. |last6=Frondorf |first6=W. |last7=Wolf |first7=M. |last8=Drechsel |first8=H. |last9=Chini |first9=R. |last10=Nasseri |first10=A. |last11=Labadie-Bartz |first11=J. |last12=Christie |first12=G. W. |last13=Walker |first13=W. S. G. |last14=Blackford |first14=M. |last15=Blane |first15=D. |last16=Henden |first16=A. A. |last17=Bohlsen |first17=T. |last18=Božić |first18=H. |last19=Jonák |first19=J. |journal=Astronomy & Astrophysics |volume=666 |pages=A24 |s2cid=250048618 }}</ref>
| radius=22.1<ref name=rainot>{{cite journal |bibcode=2020A&A...640A..15R |title=Carina High-contrast Imaging Project for massive Stars (CHIPS). I. Methodology and proof of concept on QZ Car (≡ HD 93206) |last1=Rainot |first1=A. |last2=Reggiani |first2=M. |last3=Sana |first3=H. |last4=Bodensteiner |first4=J. |last5=Gomez-Gonzalez |first5=C. A. |last6=Absil |first6=O. |last7=Christiaens |first7=V. |last8=Delorme |first8=P. |last9=Almeida |first9=L. A. |last10=Caballero-Nieves |first10=S. |last11=De Ridder |first11=J. |last12=Kratter |first12=K. |last13=Lacour |first13=S. |last14=Le Bouquin |first14=J. -B. |last15=Pueyo |first15=L. |last16=Zinnecker |first16=H. |journal=Astronomy and Astrophysics |year=2020 |volume=640 |pages=A15 |doi=10.1051/0004-6361/201936448 |arxiv=2006.01914 |s2cid=219260368 }}</ref>
| luminosity=400,000<ref name=rainot/>
| temperature=29,564<ref name=Broz/>
| gravity=3.2<ref name=rainot/>
| metal=
| rotation=
| age_myr=
| component2=A2
| mass2=8.85<ref name=Broz/>
| radius2=3.0<ref name=rainot/>
| luminosity2=1,260<ref name=rainot/>
| temperature2=23,446<ref name=Broz/>
| gravity2=4.3<ref name=rainot/>
| metal2=
| rotation2=
| age_myr2=
}}
{{Starbox detail|no_heading=y
| component1=B1
| mass=25.5<ref name=Broz/>
| radius=13.7<ref name=rainot/>
| luminosity=200,000<ref name=rainot/><ref name=parkin/>
| temperature=29,687<ref name=Broz/>
| gravity=3.6<ref name=rainot/>
| metal=
| rotation=
| age_myr=
| component2=B2
| mass2=33.2<ref name=Broz/>
| radius2=7.53<ref name=rainot/>
| luminosity2=50,100<ref name=rainot/>
| temperature2=32,979<ref name=Broz/>
| gravity2=3.92<ref name=rainot/>
| metal2=
| rotation2=
| age_myr2=
}}
{{Starbox catalog
| names=[[variable star|QZ]]&nbsp;Car, [[Henry Draper Catalogue|HD]]&nbsp;93206, [[Hipparcos catalogue|HIP]]&nbsp;52526, [[Cordoba Durchmusterung|CD]]&minus;59&nbsp;3287, [[Boss General Catalogue|GC]]&nbsp;14784, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;238414, [[Guide Star Catalog|GSC]]&nbsp;08626-02523
}}
{{Starbox reference
| Simbad=QZ+Car
}}
{{Starbox end}}


'''QZ Carinae''' ('''HD 93206''') is a multiple [[star system]] in the [[constellation]] [[Carina (constellation)|Carina]]. It is the brightest member of the loose [[open cluster]] [[Collinder 228]] and one of the brightest stars in the [[Carina Nebula]]. The [[apparent magnitude]] is [[variable star|variable]] from +6.16 to +6.49 with a period of 6 days.
Located in the Greater Carina nebula, the star system is composed of two star pairs in close orbit designated A1 and A2, and B1 and B2. The two pairs orbit each other every 25 years, while the A pair completes an orbit around each other every 20.7 days and the B pair stars every 6 days. QZ Carinae A1 is a [[blue supergiant]] of spectral type O9.7I with around 40 times the Sun's mass that has expanded to 22.5 times the Sun's radius. With a surface temperature of 32000 K, it is around 500,000 times as luminous as our Sun. Its partner A2 is a [[blue-white main sequence star]] spectral type B2V with around 10 times the Sun's mass and 6 times its radius. With a surface temperature of 20000 K, it is around 5,000 times as luminous as our Sun. QZ Carinae B1 is a hot blue giant that has expanded and cooled off the main sequence; it is of spectral type O8III with around 14.1 times the Sun's mass and 26.9 times its radius. With a surface temperature of 32573 K, it is around 200,000 times as luminous as our Sun. Partner B2 is a hot main sequence star of spectral type O9V with around 28 times the Sun's mass and 8.9 times its radius. With a surface temperature of 32463 K, it is around 80,000 times as luminous as our Sun.<ref name="parkin11"/><!-- cites para -->

==Description==
QZ Carinae is approximately 2,300 [[parsec]]s (7,500 [[light-year]]s) from [[Earth]] in the Carina Nebula [[star-forming region]].

QZ Carinae is a complex [[Star system|multiple star system]] made up of at least nine individual stars.<ref>{{Cite journal |last1=Harmanec |first1=P. |last2=Zasche |first2=P. |last3=Brož |first3=M. |last4=Catalan-Hurtado |first4=R. |last5=Barlow |first5=B. N. |last6=Frondorf |first6=W. |last7=Wolf |first7=M. |last8=Drechsel |first8=H. |last9=Chini |first9=R. |last10=Nasseri |first10=A. |last11=Pigulski |first11=A. |last12=Labadie-Bartz |first12=J. |last13=Christie |first13=G. W. |last14=Walker |first14=W. S. G. |last15=Blackford |first15=M. |date=2022-04-15 |title=Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinae - I. Observations and their initial analyses |journal=Astronomy & Astrophysics |volume=666 |pages=A23 |doi=10.1051/0004-6361/202142108 |issn=0004-6361|arxiv=2204.07045 |bibcode=2022A&A...666A..23M }}</ref> Four massive luminous stars dominate the light output of the system.<ref>{{Cite journal |last1=Sanchez-Bermudez |first1=J. |last2=Alberdi |first2=A. |last3=Barba |first3=R. |last4=Bestenlehner |first4=J. M. |last5=Cantalloube |first5=F. |last6=Brandner |first6=W. |last7=Henning |first7=Th |last8=Hummel |first8=C. A. |last9=Apellaniz |first9=J. Maiz |last10=Pott |first10=J.-U. |last11=Schoedel |first11=R. |last12=van Boekel |first12=R. |date=2017-08-10 |title=GRAVITY spectro-interferometric study of the massive multiple stellar system HD 93 206 A |journal=The Astrophysical Journal |volume=845 |issue=1 |pages=57 |doi=10.3847/1538-4357/aa803d |issn=0004-637X |doi-access=free|arxiv=1707.04915 |bibcode=2017ApJ...845...57S }}</ref> They form a quadruple system of two [[spectroscopic binaries]]: Aa (designated A1 and A2) and [[eclipsing binary]] Ac (designated B1 and B2).

The A1/A2 and B1/B2 pairs take no more than 25 years to orbit each other, while the A pair completes an orbit around each other every 20.7 days and the B pair every 6.0 days. The system is bright at [[x-ray]] wavelengths primarily due to colliding [[stellar wind]]s in the two close pairs. Pair A1/A2 contributes the bulk of the x-ray luminosity.<ref name="parkin" />

==Components==
QZ Carinae A1 is a [[blue supergiant]] of spectral type [[O-type main-sequence star|O9.7]]I with around 40 times the Sun's mass that has expanded to 22.5 times the Sun's radius. With a surface temperature of 32,000 K, it is around 500,000 times as luminous as the Sun. Its partner A2 is a [[blue-white main sequence star]] of spectral type [[B-type main-sequence star|B2]]V with around 10 times the Sun's mass and 6 times its radius. With a surface temperature of 20,000 K, it is around 5,000 times as luminous as the Sun.

QZ Carinae B1 is a hot [[blue giant]] that is expanding and cooling away from the [[main sequence]]. It is of spectral type [[O-type main-sequence star|O8]]III with around 14.1 times the Sun's mass and 26.9 times its radius. With a surface temperature of 32,573 K, it is around 200,000 times as luminous as the Sun. Partner B2 is a hot main sequence star of spectral type [[O-type main-sequence star|O9]]V with around 28 times the Sun's mass and 8.9 times its radius. With a surface temperature of 32,463 K, it is around 80,000 times as luminous as the Sun. Star B1 is less massive than B2 and is assumed to have undergone significant mass loss or mass transfer to B2.<ref name=parkin/> Together, all four stars have a combined mass 94 times that of the Sun.<ref name="project"/>

==Variability==
[[File:QZCarLightCurve.png|thumb|left|A [[light curve]] for QZ Carinae, plotted from [[Transiting Exoplanet Survey Satellite|''TESS'']] data<ref name=MAST/>]]
Star B is a [[Beta Lyrae variable]] [[Eclipsing binary|eclipsing system]]. It causes the apparent magnitude of the system to vary regularly every 5.999 days from +6.16 at maximum to +6.49 at the primary minimum and +6.43 at the secondary minimum.<ref name=gcvs/> It was first noted to be variable in 1972 by observers in Auckland.<ref name="project">{{cite journal|bibcode=1972IBVS..681....1W|title=HD 93206 (CSV 6797) an Eclipsing System Presenting Observational Problems|date=May 1972|last1=Walker|first1=W. S. G|last2=Marino|first2=B. F.|journal=Information Bulletin on Variable Stars|volume=681|number=1|pages=1}}</ref>


==References==
==References==
{{reflist}}
{{reflist|refs=

<ref name=MAST>{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=8 December 2021}}</ref>

}}


==External links==
* [http://messier.seds.org/xtra/ngc/cr228.html Collinder 228] SEDS.org


{{Stars of Carina}}
{{Stars of Carina}}


[[Category:Carina (constellation)]]
[[Category:Carina (constellation)]]
[[Category:Carina Nebula]]
[[Category:Beta Lyrae variables]]
[[Category:Beta Lyrae variables]]
[[Category:Objects named with variable star designations|Carinae, QZ]]
[[Category:Objects with variable star designations|Carinae, QZ]]
[[Category:Henry Draper Catalogue objects|93206]]
[[Category:Henry Draper Catalogue objects|093206]]
[[Category:O-type supergiants]]
[[Category:B-type main-sequence stars]]
[[Category:O-type giants]]
[[Category:O-type main-sequence stars]]
[[Category:Multiple star systems|4]]
[[Category:Durchmusterung objects]]
[[Category:Hipparcos objects|052526]]

Latest revision as of 02:17, 17 August 2024

QZ Carinae
QZ Carinae
QZ Carinae
QZ Carinae (circled) in the Carina Nebula
Credit: ESO
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 44m 22.91114s[1]
Declination −59° 59′ 35.9550″[1]
Apparent magnitude (V) 6.24[2] (6.16 - 6.49[3])
Characteristics
Evolutionary stage Blue supergiant (A1)
Main sequence (A2 and B2)
Blue giant (B1)
Spectral type A1: O9.7I
A2: B2V
B1: O8III
B2: O9V[4]
U−B color index −0.84[2]
B−V color index +0.13[2]
Variable type β Lyr[3]
Astrometry
Radial velocity (Rv)−2.80[5] km/s
Proper motion (μ) RA: −6.63[1] mas/yr
Dec.: 2.48[1] mas/yr
Parallax (π)1.67 ± 0.40 mas[1]
Distance2,300[4] pc
Orbit[4]
PrimaryA
CompanionB
Period (P)~25.4 yr
Semi-major axis (a)~35 AU
Eccentricity (e)0.0
Inclination (i)60°
Orbit[4]
PrimaryA1
CompanionA2
Period (P)20.72 days
Semi-major axis (a)116 R☉
Eccentricity (e)0.34
Inclination (i)60°
Argument of periastron (ω)
(secondary)		141°
Orbit[4]
PrimaryB1
CompanionB2
Period (P)5.999 days
Semi-major axis (a)49 R☉
Eccentricity (e)0.1
Inclination (i)86°
Argument of periastron (ω)
(secondary)		~20°
Details
A1
Mass69.8[6] M☉
Radius22.1[7] R☉
Luminosity400,000[7] L☉
Surface gravity (log g)3.2[7] cgs
Temperature29,564[6] K
A2
Mass8.85[6] M☉
Radius3.0[7] R☉
Luminosity1,260[7] L☉
Surface gravity (log g)4.3[7] cgs
Temperature23,446[6] K
B1
Mass25.5[6] M☉
Radius13.7[7] R☉
Luminosity200,000[7][4] L☉
Surface gravity (log g)3.6[7] cgs
Temperature29,687[6] K
B2
Mass33.2[6] M☉
Radius7.53[7] R☉
Luminosity50,100[7] L☉
Surface gravity (log g)3.92[7] cgs
Temperature32,979[6] K
Other designations
QZ Car, HD 93206, HIP 52526, CD−59 3287, GC 14784, SAO 238414, GSC 08626-02523
Database references
SIMBADdata

QZ Carinae (HD 93206) is a multiple star system in the constellation Carina. It is the brightest member of the loose open cluster Collinder 228 and one of the brightest stars in the Carina Nebula. The apparent magnitude is variable from +6.16 to +6.49 with a period of 6 days.

Description

[edit]

QZ Carinae is approximately 2,300 parsecs (7,500 light-years) from Earth in the Carina Nebula star-forming region.

QZ Carinae is a complex multiple star system made up of at least nine individual stars.[8] Four massive luminous stars dominate the light output of the system.[9] They form a quadruple system of two spectroscopic binaries: Aa (designated A1 and A2) and eclipsing binary Ac (designated B1 and B2).

The A1/A2 and B1/B2 pairs take no more than 25 years to orbit each other, while the A pair completes an orbit around each other every 20.7 days and the B pair every 6.0 days. The system is bright at x-ray wavelengths primarily due to colliding stellar winds in the two close pairs. Pair A1/A2 contributes the bulk of the x-ray luminosity.[4]

Components

[edit]

QZ Carinae A1 is a blue supergiant of spectral type O9.7I with around 40 times the Sun's mass that has expanded to 22.5 times the Sun's radius. With a surface temperature of 32,000 K, it is around 500,000 times as luminous as the Sun. Its partner A2 is a blue-white main sequence star of spectral type B2V with around 10 times the Sun's mass and 6 times its radius. With a surface temperature of 20,000 K, it is around 5,000 times as luminous as the Sun.

QZ Carinae B1 is a hot blue giant that is expanding and cooling away from the main sequence. It is of spectral type O8III with around 14.1 times the Sun's mass and 26.9 times its radius. With a surface temperature of 32,573 K, it is around 200,000 times as luminous as the Sun. Partner B2 is a hot main sequence star of spectral type O9V with around 28 times the Sun's mass and 8.9 times its radius. With a surface temperature of 32,463 K, it is around 80,000 times as luminous as the Sun. Star B1 is less massive than B2 and is assumed to have undergone significant mass loss or mass transfer to B2.[4] Together, all four stars have a combined mass 94 times that of the Sun.[10]

Variability

[edit]
A light curve for QZ Carinae, plotted from TESS data[11]

Star B is a Beta Lyrae variable eclipsing system. It causes the apparent magnitude of the system to vary regularly every 5.999 days from +6.16 at maximum to +6.49 at the primary minimum and +6.43 at the secondary minimum.[3] It was first noted to be variable in 1972 by observers in Auckland.[10]

References

[edit]
  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
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  11. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
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