In Chinese astronomy, Zeta Cassiopeiae is called 附路, Pinyin: Fùlù, meaning Auxiliary Road, because this star is marking itself and standing alone in the Auxiliary Roadasterism, Legs (mansion) (see : Chinese constellation).[10] 附路 (Fùlù) was westernized into Foo Loo, but that name was also designated for Eta Cassiopeiae by R.H. Allen, with the meaning of "a by-path" [11] In 2016, the IAU organized a Working Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN approved the name Fulu for Zeta Cassiopeiae on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[9]
Properties
Cassiopeia starfield
Zeta Cassiopeiae is a B2 subgiant, indicating that it has exhausted its core hydrogen and started to evolve away from the main sequence. It has a temperature of over 20,000 K, is about eight times the mass of the sun, and is 5,500 times as luminous.
Variability
Zeta Cassiopeiae is a probable member of an unusual group of variable stars known as "Slowly Pulsating B" (SPB) stars.[13] 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 × 10−2T, which varies with a period of 5.37 days.[14] 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.[15]
References
^ abcdevan 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, S2CID 18759600
^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.
^ abcdNeiner, 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" (PDF). 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
^ abJohnson, 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
^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
^ ab"Zeta Cas -- Pulsating variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-02-22
^ ab"Naming Stars". IAU.org. Retrieved 16 December 2017.
^(in Chinese) 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
^"IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
^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:10.1051/0004-6361:20030742
^De Cat, P. (June 2007), "Observational Asteroseismology of slowly pulsating B stars", Communications in Asteroseismology, 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, S2CID 59063221
January 06, 2023
zeta, cassiopeiae, latinized, from, cassiopeiae, officially, named, fulu, variable, star, constellation, cassiopeia, blue, white, classified, type, subgiant, with, apparent, magnitude, based, upon, parallax, measurements, approximately, light, years, from, cas. Zeta Cassiopeiae Latinized from z Cassiopeiae and officially named Fulu ˈ f uː l uː 9 is a variable star 8 in the constellation of Cassiopeia It has a blue white hue and is classified as a B type subgiant with an apparent magnitude of 3 66 Based upon parallax measurements it is approximately 590 light years from the Sun z Cassiopeiaez Cassiopeiae is found just south of the W asterismObservation dataEpoch J2000 Equinox J2000Constellation CassiopeiaRight ascension 00h 36m 58 28419s 1 Declination 53 53 48 8673 1 Apparent magnitude V 3 66 2 3 59 3 68 3 CharacteristicsSpectral type B2IV 4 U B color index 0 89 5 B V color index 0 19 5 Variable type SPB 3 AstrometryRadial velocity Rv 2 0 3 km sProper motion m RA 17 38 1 mas yr Dec 9 86 1 mas yrParallax p 5 50 0 16 mas 1 Distance590 20 ly 182 5 pc Absolute magnitude MV 2 8 6 Details 3 Mass8 3 M Radius5 9 R Luminosity5 500 L Surface gravity log g 3 81 cgsTemperature20 426 KMetallicity Fe H 0 23 7 dexRotation5 37045Rotational velocity v sin i 17 3 km sOther designationsFulu Zet Cas z Cas 17 Cassiopeiae BD 53 105 FK5 17 GC 727 HD 3360 HIP 2920 HR 153 SAO 21566 8 Database referencesSIMBADdata Contents 1 Nomenclature 2 Properties 2 1 Variability 3 ReferencesNomenclature Editz Cassiopeiae Latinised to Zeta Cassiopeiae is the star s Bayer designation In Chinese astronomy Zeta Cassiopeiae is called 附路 Pinyin Fulu meaning Auxiliary Road because this star is marking itself and standing alone in the Auxiliary Road asterism Legs mansion see Chinese constellation 10 附路 Fulu was westernized into Foo Loo but that name was also designated for Eta Cassiopeiae by R H Allen with the meaning of a by path 11 In 2016 the IAU organized a Working Group on Star Names WGSN 12 to catalog and standardize proper names for stars The WGSN approved the name Fulu for Zeta Cassiopeiae on 30 June 2017 and it is now so included in the List of IAU approved Star Names 9 Properties Edit Cassiopeia starfield Zeta Cassiopeiae is a B2 subgiant indicating that it has exhausted its core hydrogen and started to evolve away from the main sequence It has a temperature of over 20 000 K is about eight times the mass of the sun and is 5 500 times as luminous Variability Edit Zeta Cassiopeiae is a probable member of an unusual group of variable stars known as Slowly Pulsating B SPB stars 13 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 14 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 15 References Edit 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 amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 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 Neiner C Geers V C Henrichs H F Floquet M Fremat Y Hubert A M Preuss O Wiersema K 2003 Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae PDF Astronomy and Astrophysics 406 3 1019 Bibcode 2003A amp 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 amp 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 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 amp 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 a b Zeta Cas Pulsating variable Star SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2010 02 22 a b Naming Stars IAU org Retrieved 16 December 2017 in Chinese 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 IAU Working Group on Star Names WGSN Retrieved 22 May 2016 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 amp A 406 1019N doi 10 1051 0004 6361 20030742 De Cat P June 2007 Observational Asteroseismology of slowly pulsating B stars Communications in Asteroseismology 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 z Cassiopeiae Astronomy and Astrophysics 466 2 675 682 arXiv astro ph 0702461 Bibcode 2007A amp A 466 675S doi 10 1051 0004 6361 20066639 S2CID 59063221 Retrieved from https en wikipedia org w index php title Zeta Cassiopeiae amp oldid 1079510956, wikipedia, wiki, book, books, library,
