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Sigma Cassiopeiae

March 20, 2023

Sigma Cassiopeiae (σ Cas, σ Cassiopeiae) is a binary star in the constellation Cassiopeia. It is 1,200 to 1,400 light years from Earth and has a combined apparent magnitude of +4.88.[7]

σ Cassiopeiae
Location of σ Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
σ Cas A
Right ascension 23h 59m 00.538s[1]
Declination +55° 45′ 17.75″[1]
Apparent magnitude (V) 5.01[2]
σ Cas B
Right ascension 23h 59m 00.331s[3]
Declination +55° 45′ 20.37″[3]
Apparent magnitude (V) 7.24[2]
Characteristics
σ Cas A
Spectral type B2 IV[4]
U−B color index −0.82
B−V color index −0.07
Variable type β Cep?[5]
σ Cas B
Spectral type B3 V[4]
Astrometry
σ Cas A
Radial velocity (Rv)−12.6[6] km/s
Proper motion (μ) RA: +9.956[1] mas/yr
Dec.: −4.492[1] mas/yr
Parallax (π)2.7419 ± 0.1491 mas[1]
Distance1,190 ± 60 ly
(360 ± 20 pc)
Absolute magnitude (MV)−3.90[5]
Radial velocity (Rv)−5.0[6] km/s
Proper motion (μ) RA: +8.651[3] mas/yr
Dec.: −3.739[3] mas/yr
Parallax (π)2.2572 ± 0.0558 mas[3]
Distance1,440 ± 40 ly
(440 ± 10 pc)
Absolute magnitude (MV)−1.7[4]
Details[5]
A
Mass12 M☉
Radius11.3 R☉
Luminosity25,000 L☉
Surface gravity (log g)3.6 cgs
Temperature21,000 K
Rotational velocity (v sin i)170 km/s
Age15.8 Myr
Other designations
8 Cassiopeiae, HR 9071, HD 224572, BD+54°3082, HIP 118243, SAO 35947, ADS 17140, CCDM J23591+5546
Database references
SIMBADdata
σ Cassiopeiae in optical light

The primary component, σ Cassiopeiae A, is a B2 subgiant with an apparent magnitude of +5.0. Its companion, σ Cassiopeiae B, is a B5 main sequence dwarf with an apparent magnitude of +7.1. The two stars are three arcseconds apart.[8]

Naming

In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of σ Cassiopeiae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for σ Cassiopeiae itself is 螣蛇十一 (Téng Shé shíyī, English: the Eleventh Star of Flying Serpent).[9]

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  3. ^ a b c d e Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  4. ^ a b c Abt, H. A.; Cardona, O. (1983). "Confirmation among visual multiples of an increase of AP stars with age". Astrophysical Journal. 272: 182. Bibcode:1983ApJ...272..182A. doi:10.1086/161276.
  5. ^ a b c Catanzaro, G.; Ventura, R.; Ferrara, F.; Paternò, L. (2010). "Spectroscopic analysis of the candidate β Cephei star σ Cas: Atmospheric characterization and line-profile variability". New Astronomy. 15 (1): 39. Bibcode:2010NewA...15...39C. doi:10.1016/j.newast.2009.05.001.
  6. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN 1521-3994. ISSN 0004-6337. S2CID 119323941.
  7. ^ Nicolet, B. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics. 34: 1. Bibcode:1978A&AS...34....1N.
  8. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
  9. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日

March 20, 2023
sigma, cassiopeiae, cassiopeiae, binary, star, constellation, cassiopeia, light, years, from, earth, combined, apparent, magnitude, cassiopeiaelocation, cassiopeiae, circled, observation, dataepoch, j2000, equinox, j2000, 0constellation, cassiopeiaσ, aright, a. Sigma Cassiopeiae s Cas s Cassiopeiae is a binary star in the constellation Cassiopeia It is 1 200 to 1 400 light years from Earth and has a combined apparent magnitude of 4 88 7 s CassiopeiaeLocation of s Cassiopeiae circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation Cassiopeias Cas ARight ascension 23h 59m 00 538s 1 Declination 55 45 17 75 1 Apparent magnitude V 5 01 2 s Cas BRight ascension 23h 59m 00 331s 3 Declination 55 45 20 37 3 Apparent magnitude V 7 24 2 Characteristicss Cas ASpectral type B2 IV 4 U B color index 0 82B V color index 0 07Variable type b Cep 5 s Cas BSpectral type B3 V 4 Astrometrys Cas ARadial velocity Rv 12 6 6 km sProper motion m RA 9 956 1 mas yr Dec 4 492 1 mas yrParallax p 2 7419 0 1491 mas 1 Distance1 190 60 ly 360 20 pc Absolute magnitude MV 3 90 5 Radial velocity Rv 5 0 6 km sProper motion m RA 8 651 3 mas yr Dec 3 739 3 mas yrParallax p 2 2572 0 0558 mas 3 Distance1 440 40 ly 440 10 pc Absolute magnitude MV 1 7 4 Details 5 AMass12 M Radius11 3 R Luminosity25 000 L Surface gravity log g 3 6 cgsTemperature21 000 KRotational velocity v sin i 170 km sAge15 8 MyrOther designations8 Cassiopeiae HR 9071 HD 224572 BD 54 3082 HIP 118243 SAO 35947 ADS 17140 CCDM J23591 5546Database referencesSIMBADdatas Cassiopeiae in optical light The primary component s Cassiopeiae A is a B2 subgiant with an apparent magnitude of 5 0 Its companion s Cassiopeiae B is a B5 main sequence dwarf with an apparent magnitude of 7 1 The two stars are three arcseconds apart 8 Naming EditIn Chinese 螣蛇 Teng She meaning Flying Serpent refers to an asterism consisting of s Cassiopeiae a Lacertae 4 Lacertae p2 Cygni p1 Cygni HD 206267 e Cephei b Lacertae r Cassiopeiae t Cassiopeiae AR Cassiopeiae 9 Lacertae 3 Andromedae 7 Andromedae 8 Andromedae l Andromedae k Andromedae i Andromedae and ps Andromedae Consequently the Chinese name for s Cassiopeiae itself is 螣蛇十一 Teng She shiyi English the Eleventh Star of Flying Serpent 9 References Edit a b c d e Vallenari A et al Gaia Collaboration 2022 Gaia Data Release 3 Summary of the content and survey properties Astronomy amp Astrophysics arXiv 2208 00211 doi 10 1051 0004 6361 202243940 Gaia DR3 record for this source at VizieR a b Hog E Fabricius C Makarov V V Urban S Corbin T Wycoff G Bastian U Schwekendiek P Wicenec A 2000 The Tycho 2 catalogue of the 2 5 million brightest stars Astronomy and Astrophysics 355 L27 Bibcode 2000A amp A 355L 27H a b c d e Vallenari A et al Gaia Collaboration 2022 Gaia Data Release 3 Summary of the content and survey properties Astronomy amp Astrophysics arXiv 2208 00211 doi 10 1051 0004 6361 202243940 Gaia DR3 record for this source at VizieR a b c Abt H A Cardona O 1983 Confirmation among visual multiples of an increase of AP stars with age Astrophysical Journal 272 182 Bibcode 1983ApJ 272 182A doi 10 1086 161276 a b c Catanzaro G Ventura R Ferrara F Paterno L 2010 Spectroscopic analysis of the candidate b Cephei star s Cas Atmospheric characterization and line profile variability New Astronomy 15 1 39 Bibcode 2010NewA 15 39C doi 10 1016 j newast 2009 05 001 a b Kharchenko N V Scholz R D Piskunov A E Roser S Schilbach E November 2007 Astrophysical supplements to the ASCC 2 5 Ia Radial velocities of 55000 stars and mean radial velocities of 516 Galactic open clusters and associations Astronomische Nachrichten 328 9 889 896 arXiv 0705 0878 Bibcode 2007AN 328 889K doi 10 1002 asna 200710776 eISSN 1521 3994 ISSN 0004 6337 S2CID 119323941 Nicolet B 1978 Catalogue of homogeneous data in the UBV photoelectric photometric system Astronomy and Astrophysics 34 1 Bibcode 1978A amp AS 34 1N Mason Brian D Wycoff Gary L Hartkopf William I Douglass Geoffrey G Worley Charles E 2001 The 2001 US Naval Observatory Double Star CD ROM I The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Bibcode 2001AJ 122 3466M doi 10 1086 323920 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 7 月 7 日 Retrieved from https en wikipedia org w index php title Sigma Cassiopeiae amp oldid 1141287455, wikipedia, wiki, book, books, library,

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