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| name=ζ Cassiopeiae}}
| name=ζ Cassiopeiae}}
{{Starbox image
{{Starbox image
| image = [[File:Cassiopeia constellation map.svg|250px]]
| image = [[File:Cassiopeia constellation map.svg|250px]]
| caption = ζ Cas is found just south of α Cas
| caption = ζ Cas is found just south of α Cas
}}
}}
{{Starbox observe
{{Starbox observe
| epoch = J2000
| epoch = J2000
| ra = {{RA|00|36|58.28419}}<ref name=aaa474_2_653/>
| ra = {{RA|00|36|58.28419}}<ref name=aaa474_2_653/>
| dec = {{DEC|+53|53|48.8673}}<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 = 3.66<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/>)
| constell = [[Cassiopeia (constellation)|Cassiopeia]] }}
| constell = [[Cassiopeia (constellation)|Cassiopeia]] }}
{{Starbox character
{{Starbox character
| class = B2IV<ref name=araa11_29/>
| class = B2IV<ref name=araa11_29/>
| b-v = –0.19<ref name=clpl4/>
| b-v = –0.19<ref name=clpl4/>
| u-b = –0.89<ref name=clpl4/>
| u-b = –0.89<ref name=clpl4/>
| variable = [[Slowly pulsating B star|SPB]]<ref name=neiner/>
| variable = [[Slowly pulsating B star|SPB]]<ref name=neiner/>
}}
}}
{{Starbox astrometry
{{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=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>
| prop_mo_ra = 17.38<ref name=aaa474_2_653/>
| prop_mo_ra = 17.38<ref name=aaa474_2_653/>
| prop_mo_dec = –9.86<ref name=aaa474_2_653/>
| prop_mo_dec = –9.86<ref name=aaa474_2_653/>
| parallax = 5.50
| parallax = 5.50
| p_error = 0.16
| p_error = 0.16
Line 37: Line 37:
| age =
| age =
}}
}}
{{Starbox catalog
{{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/>
}}
}}
Line 64: Line 64:
<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=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=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>
<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| doi-broken-date=2016-01-17 }}</ref>


<ref name=spj1_387_673>{{citation | last1=Gies | first1=Douglas R. | last2=Lambert | first2=David L. | title=Carbon, nitrogen, and oxygen abundances in early B-type stars | journal=Astrophysical Journal, Part 1 | volume=387 | pages=673–700 |date=March 1992 | doi=10.1086/171116 | bibcode=1992ApJ...387..673G }}</ref>
<ref name=spj1_387_673>{{citation | last1=Gies | first1=Douglas R. | last2=Lambert | first2=David L. | title=Carbon, nitrogen, and oxygen abundances in early B-type stars | journal=Astrophysical Journal, Part 1 | volume=387 | pages=673–700 |date=March 1992 | doi=10.1086/171116 | bibcode=1992ApJ...387..673G }}</ref>
Line 70: Line 70:
<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=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=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=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 | pages=99 | year=1966 | bibcode=1966CoLPL...4...99J }}</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=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>

Revision as of 16:48, 17 January 2016

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[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 (Rv)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]
Distance590 ± 20 ly
(182 ± 5 pc)
Absolute magnitude (MV)–2.8[6]
Details
Mass8.3[3] M☉
Radius5.9[3] R☉
Luminosity5,500[3] L☉
Surface gravity (log g)3.81[3] cgs
Temperature20,426[3] K
Metallicity [Fe/H]–0.23[7] dex
Rotation5.37045[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
SIMBADdata

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]

See also

References

  1. ^ 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
  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.
  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.
  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
  5. ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 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.
  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
  8. ^ "Zeta Cas -- Pulsating variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-02-22
  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 (inactive 2016-01-17){{citation}}: CS1 maint: DOI inactive as of January 2016 (link)
  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
  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
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