HD 73389: Difference between revisions
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{{Short description|Binary star system in the constellation Carina}} |
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{{Starbox short | |
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{{about|e<sup>2</sup> Carinae|e<sup>1</sup> Carinae|HD 73390|E Carinae|V345 Carinae}} |
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| name=e² Carinae |
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{{distinguish|ε Carinae}} |
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| epoch=[[J2000.0]] |
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{{Starbox begin}} |
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| constell=[[Carina]] |
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{{Starbox observe |
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| ra=08<sup>h</sup>35<sup>m</sup>19.6<sup>s</sup> |
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| epoch = J2000 |
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| dec=−58°00′33″ |
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| constell = [[Carina (constellation)|Carina]] |
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| spectral=K0III |
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| ra = {{RA|08|35|19.70886}}<ref name=GaiaDR2/> |
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| appmag_v=+4.84 |
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| dec = {{DEC|−58|00|33.2714}}<ref name=GaiaDR2/> |
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| dist_ly=230 ± 7 |
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| appmag_v = +4.84<ref name=Anderson2012/> {{nowrap|(5.08 + 8.02)}}<ref name=Eggleton2008/> |
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| dist_pc=70 ± 2 |
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| names=[[Harvard Revised catalogue|HR]] 3414, [[Henry Draper Catalogue|HD]] 73389, [[Bonner Durchmusterung|CP]]−57°1591, [[Hipparcos catalogue|HIP]] 42134, [[Smithsonian Astrophysical Observatory catalogue|SAO]] 236106, GC 11797, CCDM J08353-5801 |
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}} |
}} |
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{{Starbox character |
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'''HD 73389''', also known as '''e² Carinae''' (e² Car), is a [[binary star]] in the [[constellation]] [[Carina]]. It is approximately 230 [[light year]]s from [[Earth]]. |
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| type = |
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| class = K0III<ref name=houk1978/> |
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| b-v = {{Val|0.981|0.041}}<ref name=Anderson2012/> |
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| u-b = |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = {{Val|+25.62|0.13}}<ref name=GaiaDR2/> |
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| prop_mo_ra = {{val|+52.848|0.555}}<ref name=GaiaDR2/> |
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| prop_mo_dec = {{val|+28.117|0.491}}<ref name=GaiaDR2/> |
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| parallax = 14.5139 |
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| p_error = 0.2692 |
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| parallax_footnote = <ref name=GaiaDR2/> |
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| absmag_v = 0.68<ref name=Anderson2012/> |
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}} |
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{{Starbox detail |
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| source = |
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| component1 = A |
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| mass = |
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| radius = {{Val|11.13|1.11|0.39}}<ref name=GaiaDR2/> |
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| luminosity = {{Val|64.4|1.4}}<ref name=GaiaDR2/> |
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| gravity = |
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| temperature = {{Val|4903|87|229|fmt=commas}}<ref name=GaiaDR2/> |
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| metal_fe = |
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| rotational_velocity = |
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| age_myr = |
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}} |
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{{Starbox catalog |
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| names = {{odlist | B=e<sup>2</sup> Car | CPD=−57°1591 | GC=11797 | HD=73389 | HIP=42134 | HR=3414 | SAO=236106 | CCDM=J08353-5801 }}<ref name="Simbad"/> |
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}} |
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{{Starbox reference |
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| Simbad = HD+73389 |
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}} |
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{{End}} |
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'''HD 73389''' is a [[binary star]]<ref name=Eggleton2008/> system in the [[constellation]] [[Carina (constellation)|Carina]]. It has the [[Bayer designation]] '''e<sup>2</sup> Carinae'''; ''HD 73389'' is the identifier from the ''[[Henry Draper Catalogue]]''. This system is visible to the naked eye as a point of light with a combined [[apparent visual magnitude]] of +4.84.<ref name=Anderson2012/> Based on [[stellar parallax|parallax]] measurements, it is located at a distance of approximately 225 [[light year]]s from the [[Sun]]. The system is drifting further away with a [[radial velocity]] of +25.6 km/s.<ref name=GaiaDR2/> |
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The primary component, '''e² Carinae A''', is an orange [[stellar classification|K-type]] [[giant star|giant]] with an [[apparent magnitude]] of +4.84. The companion star, '''e² Carinae B''', is an eighth magnitude star located 0.29 [[arcsecond]]s, or at least 20 [[Astronomical Units|AU]] from the primary. |
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The visual magnitude 5.08 primary, component A, is an aging [[K-type star|K-type]] [[giant star]] with a [[stellar classification]] of K0III.<ref name=houk1978/> With the supply of hydrogen at its [[stellar core|core]] exhausted, it has cooled and expanded to 11 times the [[Sun's radius]].<ref name=GaiaDR2/> It is radiating 64 times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,903 K.<ref name=GaiaDR2/> The secondary companion, component B, has a [[visual magnitude]] of 8.02 and is located at an [[angular separation]] of {{Val|0.30|ul=arcsecond}} along a [[position angle]] of 207° from the primary, as of 2015.<ref name=Mason2014/> |
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==References== |
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{{Reflist|refs= |
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<ref name=GaiaDR2>{{Cite Gaia DR2|5314918610293463168}}</ref> |
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<ref name="Simbad">{{cite simbad | title=HD 73389 | access-date=2018-07-11}}</ref> |
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<ref name=Anderson2012>{{citation |
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| title=XHIP: An extended hipparcos compilation |
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| last1=Anderson | first1=E. | last2=Francis | first2=Ch. |
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| journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 |
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| bibcode=2012AstL...38..331A | arxiv=1108.4971 |
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| doi=10.1134/S1063773712050015 | s2cid=119257644 | postscript=. }}</ref> |
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<ref name=houk1978>{{citation |
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| last1=Houk | first1=Nancy |
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| title=Michigan catalogue of two-dimensional spectral types for the HD stars |
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| volume=1 | publication-place=Ann Arbor |
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| publisher=Dept. of Astronomy, University of Michigan |
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| year=1978 | bibcode=1975mcts.book.....H | postscript=. }}</ref> |
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<ref name=Eggleton2008>{{citation |
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| title=A catalogue of multiplicity among bright stellar systems |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=389 | issue=2 | pages=869 | date=2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 |
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| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}</ref> |
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<ref name=Mason2014>{{citation |
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| display-authors=1 | last1=Mason | first1=B. D. |
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| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. |
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| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. |
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| title=The Washington Visual Double Star Catalog |
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| journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 |
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| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds |
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| access-date=2015-07-22 | doi-access=free }}</ref> |
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}} |
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{{ |
{{Stars of Carina}} |
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{{DEFAULTSORT:HD 73389}} |
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[[Category:Bayer objects|Carinae, e²]] |
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[[Category:K-type giants]] |
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[[Category:Binary stars]] |
[[Category:Binary stars]] |
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[[Category:Carina constellation]] |
[[Category:Carina (constellation)]] |
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[[Category: |
[[Category:Bayer objects|Carinae, e2]] |
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[[Category: |
[[Category:Durchmusterung objects]] |
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[[Category:Henry Draper Catalogue objects|073389]] |
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[[Category:Hipparcos objects|042134]] |
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[[Category:Bright Star Catalogue objects|3414]] |
Latest revision as of 19:54, 18 July 2024
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Carina |
Right ascension | 08h 35m 19.70886s[1] |
Declination | −58° 00′ 33.2714″[1] |
Apparent magnitude (V) | +4.84[2] (5.08 + 8.02)[3] |
Characteristics | |
Spectral type | K0III[4] |
B−V color index | 0.981±0.041[2] |
Astrometry | |
Radial velocity (Rv) | +25.62±0.13[1] km/s |
Proper motion (μ) | RA: +52.848±0.555[1] mas/yr Dec.: +28.117±0.491[1] mas/yr |
Parallax (π) | 14.5139 ± 0.2692 mas[1] |
Distance | 225 ± 4 ly (69 ± 1 pc) |
Absolute magnitude (MV) | 0.68[2] |
Details | |
A | |
Radius | 11.13+1.11 −0.39[1] R☉ |
Luminosity | 64.4±1.4[1] L☉ |
Temperature | 4,903+87 −229[1] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 73389 is a binary star[3] system in the constellation Carina. It has the Bayer designation e2 Carinae; HD 73389 is the identifier from the Henry Draper Catalogue. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.84.[2] Based on parallax measurements, it is located at a distance of approximately 225 light years from the Sun. The system is drifting further away with a radial velocity of +25.6 km/s.[1]
The visual magnitude 5.08 primary, component A, is an aging K-type giant star with a stellar classification of K0III.[4] With the supply of hydrogen at its core exhausted, it has cooled and expanded to 11 times the Sun's radius.[1] It is radiating 64 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,903 K.[1] The secondary companion, component B, has a visual magnitude of 8.02 and is located at an angular separation of 0.30″ along a position angle of 207° from the primary, as of 2015.[6]
References
[edit]- ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ "HD 73389". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-11.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22