Zeta Cassiopeiae: Difference between revisions

ζ Cassiopeiae
	; ζ Cas is found just south of α Cas
Observation data; Epoch J2000 Equinox J2000
Constellation	Cassiopeia
Right ascension	00h 36m 58.28419s
Declination	+53° 53′ 48.8673″
Apparent magnitude (V)	3.66 (3.59 - 3.68)
Characteristics
Spectral type	B2IV
U−B color index	–0.89
B−V color index	–0.19
Variable type	SPB
Astrometry
Radial velocity (Rv)	2.0 km/s
Proper motion (μ)	RA: 17.38 mas/yr ; Dec.: –9.86 mas/yr
Parallax (π)	5.50 ± 0.16 mas
Distance	590 ± 20 ly ; (182 ± 5 pc)
Absolute magnitude (MV)	–2.8
Details
Mass	8.3 M☉
Radius	5.9 R☉
Luminosity	5,500 L☉
Surface gravity (log g)	3.81 cgs
Temperature	20,426 K
Metallicity [Fe/H]	–0.23 dex
Rotation	5.37045
Rotational velocity (v sin i)	17 ± 3 km/s
Other designations
	17 Cassiopeiae, HR 153, HD 3360, BD+53°105, FK5 17, HIP 2920, SAO 21566, GC 727
Database references
SIMBAD	data

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Zeta Cassiopeiae (ζ Cas, ζ Cassiopeiae) is a star in the constellation Cassiopeia. It has a blue-white hue and is classified as a B-type subgiant with an apparent magnitude of +3.66. It is approximately 590 light years from Earth.

ζ Cas is a probable member of an unusual group of variable stars known as "Slowly Pulsating B" (SPB) stars.^[9] It shows a pulsation frequency of 0.64 per day (or once every 1.56 days) and displays a weak magnetic field with a strength of roughly 3.35 × 10⁻² T, which varies with a period of 5.37 days.^[10] This likely matches the rotation rate of the star, which, when combined with the low projected rotational velocity, indicates the star may be seen nearly pole-on. Zeta Cassiopeiae is a candidate magnetic Bp star that shows an overabundance of helium. The star contains a randomly oriented fossil magnetic field, which impacts the outflow of the stellar wind. Collisions between streams from this stellar wind creates a shock front, with cooling particles settling toward a co-rotating disk.^[11]

Chinese name

In Chinese astronomy, Zeta Cassiopeiae is called 附路, Pinyin: Fùlù, meaning Auxiliary Road, because this star is marking itself and stand alone in Auxiliary Road asterism, Legs (mansion) (see : Chinese constellation).^[12] 附路 (Fùlù) is westernized into Foo Loo, but the name Foo Loo was designated not only for Zeta Cassiopeiae, but also for η Cassiopeiae (Achird) by R.H. Allen, with the meaning is "a by-path" ^[13]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 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
^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Neiner, C.; Geers, V. C.; Henrichs, H. F.; Floquet, M.; Frémat, Y.; Hubert, A.-M.; Preuss, O.; Wiersema, K. (2003). "Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae". Astronomy and Astrophysics. 406 (3): 1019. Bibcode:2003A&A...406.1019N. doi:10.1051/0004-6361:20030742.
^ Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333
^ ^a ^b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J
^ Jaschek, C.; Gomez, A. E. (1998). "The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes". Astronomy and Astrophysics. 330: 619. Bibcode:1998A&A...330..619J.
^ Gies, Douglas R.; Lambert, David L. (March 1992), "Carbon, nitrogen, and oxygen abundances in early B-type stars", Astrophysical Journal, Part 1, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116
^ "Zeta Cas -- Pulsating variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-02-22
^ Neiner, C.; et al. (2003), "Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae", Astronomy and Astrophysics, 406 (3): 1019–1031, Bibcode:2003A&A...406.1019N, doi:10.1051/0004-6361:2003074
^ De Cat, P. (June 2007), "Observational Asteroseismology of slowly pulsating B stars", Communications in Astroseismology, 150: 167–174, Bibcode:2007CoAst.150..167D, doi:10.1553/cia150s167
^ Smith, M. A.; Bohlender, D. A. (May 2007), "Variations of the ultraviolet resonance lines of the B2 IV-V star ζ Cassiopeiae", Astronomy and Astrophysics, 466 (2): 675–682, arXiv:astro-ph/0702461, Bibcode:2007A&A...466..675S, doi:10.1051/0004-6361:20066639
^ Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日
^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Cassiopeia

[aaa474_2_653-1] van Leeuwen, F. (November 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

[ducati-2] Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.

[neiner-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Neiner, C.; Geers, V. C.; Henrichs, H. F.; Floquet, M.; Frémat, Y.; Hubert, A.-M.; Preuss, O.; Wiersema, K. (2003). "Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae". Astronomy and Astrophysics. 406 (3): 1019. Bibcode:2003A&A...406.1019N. doi:10.1051/0004-6361:20030742.

[araa11_29-4] Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333

[clpl4-5] Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J

[6] Jaschek, C.; Gomez, A. E. (1998). "The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes". Astronomy and Astrophysics. 330: 619. Bibcode:1998A&A...330..619J.

[spj1_387_673-7] Gies, Douglas R.; Lambert, David L. (March 1992), "Carbon, nitrogen, and oxygen abundances in early B-type stars", Astrophysical Journal, Part 1, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116

[SIMBAD-8] "Zeta Cas -- Pulsating variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-02-22

[aaa406_3_1019-9] Neiner, C.; et al. (2003), "Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae", Astronomy and Astrophysics, 406 (3): 1019–1031, Bibcode:2003A&A...406.1019N, doi:10.1051/0004-6361:2003074

[cia150_167-10] De Cat, P. (June 2007), "Observational Asteroseismology of slowly pulsating B stars", Communications in Astroseismology, 150: 167–174, Bibcode:2007CoAst.150..167D, doi:10.1553/cia150s167

[aaa466_2_675-11] Smith, M. A.; Bohlender, D. A. (May 2007), "Variations of the ultraviolet resonance lines of the B2 IV-V star ζ Cassiopeiae", Astronomy and Astrophysics, 466 (2): 675–682, arXiv:astro-ph/0702461, Bibcode:2007A&A...466..675S, doi:10.1051/0004-6361:20066639

[12] Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日

[13] Richard Hinckley Allen: Star Names — Their Lore and Meaning: Cassiopeia

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

@@ Line 3: / Line 3: @@
 {{Starbox image
 | image = [[File:Cassiopeia constellation map.svg|250px]]
-| caption = ζ Cas is found just below α Cas
+| caption = ζ Cas is found just south of α Cas
 }}
 {{Starbox observe
@@ Line 9: / Line 9: @@
 | ra = {{RA|00|36|58.28419}}<ref name=aaa474_2_653/>
 | dec = {{DEC|+53|53|48.8673}}<ref name=aaa474_2_653/>
+| appmag_v = 3.66<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|author1=Ducati|first1=J. R.|year=2002}}</ref> (3.59 - 3.68<ref name=neiner/>)
-| appmag_v = 3.666<ref name=SIMBAD/>
 | constell = [[Cassiopeia (constellation)|Cassiopeia]] }}
 {{Starbox character
@@ Line 15: / Line 15: @@
 | b-v = –0.19<ref name=clpl4/>
 | u-b = –0.89<ref name=clpl4/>
-| variable = SPB<ref name="kaler" />}}
+| variable = SPB<ref name=neiner/>
+}}
 {{Starbox astrometry
+| radial_v = 2.0<ref name=neiner>{{cite journal|bibcode=2003A&A...406.1019N|title=Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae|journal=Astronomy and Astrophysics|volume=406|issue=3|pages=1019|author1=Neiner|first1=C.|last2=Geers|first2=V. C.|last3=Henrichs|first3=H. F.|last4=Floquet|first4=M.|last5=Frémat|first5=Y.|last6=Hubert|first6=A.-M.|last7=Preuss|first7=O.|last8=Wiersema|first8=K.|year=2003|doi=10.1051/0004-6361:20030742}}</ref>
-| radial_v = 2.0<ref name=SIMBAD/>
 | prop_mo_ra = 17.38<ref name=aaa474_2_653/>
 | prop_mo_dec = –9.86<ref name=aaa474_2_653/>
@@ Line 23: / Line 24: @@
 | p_error = 0.16
 | parallax_footnote = <ref name=aaa474_2_653/>
+| absmag_v = –2.8<ref>{{cite journal|bibcode=1998A&A...330..619J|title=The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes|journal=Astronomy and Astrophysics|volume=330|pages=619|author1=Jaschek|first1=C.|last2=Gomez|first2=A. E.|year=1998}}</ref>
-| absmag_v = –2.63 }}
+}}
 {{Starbox detail
-| mass = 8.4<ref name=aaa307_849/>
+| mass = 8.3<ref name=neiner/>
-| radius = 5.8<ref name=mnras189_601/>
+| radius = 5.9<ref name=neiner/>
-| luminosity = 6,400<ref name=kaler/>
+| luminosity = 5,500<ref name=neiner/>
-| temperature = 22,180<ref name=spj1_387_673/>
+| temperature = 20,426<ref name=neiner/>
-| gravity = 3.92<ref name=spj1_387_673/>
+| gravity = 3.81<ref name=neiner/>
 | metal_fe = –0.23<ref name=spj1_387_673/>
-| rotational_velocity = 2.0<ref name=scfs/>
+| rotational_velocity = 17 ± 3<ref name=neiner/>
-| age = 2.0{{e|7}}<ref name=kaler/> }}
+| rotation = 5.37045<ref name=neiner/>
+| age =
+}}
 {{Starbox catalog
-| names=17&nbsp;Cassiopeiae, [[Harvard Revised catalogue|HR]]&nbsp;153, [[Henry Draper Catalogue|HD]]&nbsp;3360, [[Bonner Durchmusterung|BD]]+53°105, [[Fifth Fundamental Catalogue|FK5]]&nbsp;17, [[Hipparcos catalogue|HIP]]&nbsp;2920, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;21566, GC&nbsp;727.<ref name=SIMBAD/> }}
+| names=17&nbsp;Cassiopeiae, [[Harvard Revised catalogue|HR]]&nbsp;153, [[Henry Draper Catalogue|HD]]&nbsp;3360, [[Bonner Durchmusterung|BD]]+53°105, [[Fifth Fundamental Catalogue|FK5]]&nbsp;17, [[Hipparcos catalogue|HIP]]&nbsp;2920, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;21566, GC&nbsp;727<ref name=SIMBAD/>
+}}
 {{Starbox reference
-| Simbad=HR153 }}
+| Simbad=HR153
+}}
 {{Starbox end}}
-'''Zeta Cassiopeiae''' (ζ Cas, ζ Cassiopeiae) is a [[star]] in the [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]]. It has a blue-white hue and is classified as a [[stellar classification|B-type]] [[subgiant]] with an [[apparent magnitude]] of +3.67. It is approximately 590 [[light years]] from [[Earth]].<ref name=aaa474_2_653/>
+'''Zeta Cassiopeiae''' (ζ Cas, ζ Cassiopeiae) is a [[star]] in the [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]]. It has a blue-white hue and is classified as a [[stellar classification|B-type]] [[subgiant]] with an [[apparent magnitude]] of +3.66. It is approximately 590 [[light years]] from [[Earth]].
-ζ Cas is a member of an unusual group of variable stars known as "[[slowly pulsating B star|Slowly Pulsating B]]" (SPB) stars.<ref name=aaa406_3_1019/> It shows a pulsation frequency of 0.64 per day (or once every 1.56 days) and displays a weak [[Stellar magnetic field|magnetic field]] with a strength of roughly {{nowrap|3.35 × 10<sup>−2</sup> [[Tesla (unit)|T]]}}, which varies with a period of 5.37 days.<ref name=cia150_167/> This likely matches the rotation rate of the star, which, when combined with the low [[Stellar rotation|projected rotational velocity]], indicates the star may be seen nearly pole-on. Zeta Cassiopeiae is a candidate magnetic [[Bp star]] that shows an overabundance of helium. The star contains a randomly oriented [[Fossil stellar magnetic field|fossil magnetic field]], which impacts the outflow of the stellar wind. Collisions between streams from this stellar wind creates a shock front, with cooling particles settling toward a co-rotating disk.<ref name=aaa466_2_675/>
+ζ Cas is a probable member of an unusual group of variable stars known as "[[slowly pulsating B star|Slowly Pulsating B]]" (SPB) stars.<ref name=aaa406_3_1019/> It shows a pulsation frequency of 0.64 per day (or once every 1.56 days) and displays a weak [[Stellar magnetic field|magnetic field]] with a strength of roughly {{nowrap|3.35 × 10<sup>−2</sup> [[Tesla (unit)|T]]}}, which varies with a period of 5.37 days.<ref name=cia150_167/> This likely matches the rotation rate of the star, which, when combined with the low [[Stellar rotation|projected rotational velocity]], indicates the star may be seen nearly pole-on. Zeta Cassiopeiae is a candidate magnetic [[Bp star]] that shows an overabundance of helium. The star contains a randomly oriented [[Fossil stellar magnetic field|fossil magnetic field]], which impacts the outflow of the stellar wind. Collisions between streams from this stellar wind creates a shock front, with cooling particles settling toward a co-rotating disk.<ref name=aaa466_2_675/>
 ==Chinese name==
 In [[Chinese astronomy]], Zeta Cassiopeiae is called 附路, [[Pinyin]]: Fùlù, meaning ''	Auxiliary Road'', because this star is marking itself and stand alone in ''Auxiliary Road'' asterism, ''[[Legs (Chinese constellation)|Legs]]'' (mansion) (see : [[Chinese constellation]]).<ref>{{zh icon}} [http://aeea.nmns.edu.tw/2006/0607/ap060709.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日]</ref> 附路 (Fùlù) is westernized into '''Foo Loo''', but the name ''Foo Loo'' was designated not only for Zeta Cassiopeiae, but also for [[Eta Cassiopeiae|η Cassiopeiae]] (Achird) by R.H. Allen, with the meaning is "a by-path" <ref>[http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Cassiopeia*.html Richard Hinckley Allen: Star Names — Their Lore and Meaning: Cassiopeia]</ref>
@@ Line 57: / Line 62: @@
 <ref name=aaa474_2_653>{{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 |date=November 2007 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V |arxiv = 0708.1752 }}</ref>
-<ref name=SIMBAD>{{citation | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR153 | title=NSV 225 -- Pulsating variable Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | accessdate=2010-02-22 }}</ref>
+<ref name=SIMBAD>{{citation | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR153 | title=Zeta Cas -- Pulsating variable Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | accessdate=2010-02-22 }}</ref>
-<ref name=kaler>{{citation | title=ZETA CAS (Zeta Cassiopeiae) | publisher=University of Illinois | first1=James B. (Jim) | last1=Kaler | url=http://stars.astro.illinois.edu/sow/zetacas.html | accessdate=2010-02-22 }}</ref>
 <ref name=aaa406_3_1019>{{citation | display-authors=1 | last1=Neiner | first1=C. | last2=Geers | first2=V. C. | last3=Henrichs | first3=H. F. | last4=Floquet | first4=M. | last5=Frémat | first5=Y. | last6=Hubert | first6=A.-M. | last7=Preuss | first7=O. | last8=Wiersema | first8=K. | title=Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae | journal=Astronomy and Astrophysics | year=2003 | volume=406 | issue=3 | pages=1019–1031 | bibcode=2003A&A...406.1019N | doi=10.1051/0004-6361:2003074}}</ref>
@@ Line 66: / Line 69: @@
 <ref name=araa11_29>{{citation | last1=Morgan | first1=W. W. | last2=Keenan | first2=P. C. | title=Spectral Classification | journal=Annual Review of Astronomy and Astrophysics | volume=11 | page=29 | year=1973 | doi=10.1146/annurev.aa.11.090173.000333 | bibcode=1973ARA&A..11...29M }}</ref>
-<ref name=scfs>{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | bibcode=1999VeARI..35....1W }}</ref>
 <ref name=clpl4>{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J }}</ref>
-<ref name=aaa307_849>{{citation | last1=Venn | first1=K. A. | last2=Lambert | first2=D. L. | last3=Lemke | first3=M. | title=The abundance of boron in evolved A- and B-type stars. | journal=Astronomy and Astrophysics | volume=307 | pages=849–859 |date=March 1996 | bibcode=1996A&A...307..849V |arxiv = astro-ph/9508001 }}</ref>
 <ref name=cia150_167>{{citation | last1=De Cat | first1=P. | title=Observational Asteroseismology of slowly pulsating B stars | journal=Communications in Astroseismology | volume=150 | pages=167–174 |date=June 2007 | doi=10.1553/cia150s167 | bibcode=2007CoAst.150..167D }}</ref>
 <ref name=aaa466_2_675>{{citation | last1=Smith | first1=M. A. | last2=Bohlender | first2=D. A. | title=Variations of the ultraviolet resonance lines of the B2 IV-V star ζ Cassiopeiae | journal=Astronomy and Astrophysics | volume=466 | issue=2 | pages=675–682 |date=May 2007 | doi=10.1051/0004-6361:20066639 | bibcode=2007A&A...466..675S |arxiv = astro-ph/0702461 }}</ref>
-<ref name=mnras189_601>{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=189 | pages=601–605 |date=November 1979 | bibcode=1979MNRAS.189..601U | doi=10.1093/mnras/189.3.601}}</ref>
 }}

Observation data Epoch J2000 Equinox J2000
ζ Cas is found just south of α Cas
Constellation	Cassiopeia
Right ascension	00^h 36^m 58.28419^s^[1]
Declination	+53° 53′ 48.8673″^[1]
Apparent magnitude (V)	3.66^[2] (3.59 - 3.68^[3])
Characteristics
Spectral type	B2IV^[4]
U−B color index	–0.89^[5]
B−V color index	–0.19^[5]
Variable type	SPB^[3]
Astrometry

Radial velocity (R_v)	2.0^[3] km/s
Proper motion (μ)	RA: 17.38^[1] mas/yr Dec.: –9.86^[1] mas/yr
Parallax (π)	5.50 ± 0.16 mas^[1]
Distance	590 ± 20 ly (182 ± 5 pc)
Absolute magnitude (M_V)	–2.8^[6]

Details

Mass	8.3^[3] `M`_☉
Radius	5.9^[3] `R`_☉
Luminosity	5,500^[3] `L`_☉
Surface gravity (log g)	3.81^[3] cgs
Temperature	20,426^[3] K
Metallicity [Fe/H]	–0.23^[7] dex
Rotation	5.37045^[3]
Rotational velocity (v sin i)	17 ± 3^[3] km/s

Other designations
17 Cassiopeiae, HR 153, HD 3360, BD+53°105, FK5 17, HIP 2920, SAO 21566, GC 727^[8]
Database references
SIMBAD	data

Revision as of 22:34, 13 September 2015

Chinese name

See also

References