Phi Cassiopeiae

φ Cassiopeiae
Location of φ Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
A
Right ascension 01h 20m 04.916s[1]
Declination +58° 13′ 53.81″[1]
Apparent magnitude (V) +5.11[2]
C
Right ascension 01h 19m 51.736s[3]
Declination +58° 11′ 29.32″[3]
Apparent magnitude (V) +7.08[2]
Characteristics
A
Spectral type F0Ia[2]
U−B color index +0.49[4]
B−V color index +0.68[4]
C
Spectral type B6Ib[2]
U−B color index −0.37[4]
B−V color index +0.41[4]
Astrometry
A
Radial velocity (Rv)−28.39[5] km/s
Proper motion (μ) RA: −1.479[1] mas/yr
Dec.: −1.231[1] mas/yr
Parallax (π)0.2142 ± 0.0838 mas[1]
Distanceapprox. 15,000 ly
(approx. 5,000 pc)
Absolute magnitude (MV)−8.76[6]
C
Radial velocity (Rv)−28.50[7] km/s
Proper motion (μ) RA: −1.560[3] mas/yr
Dec.: −0.809[3] mas/yr
Parallax (π)0.3679 ± 0.0169 mas[3]
Distance8,900 ± 400 ly
(2,700 ± 100 pc)
Absolute magnitude (MV)−6.5[8]
Details
A
Mass6.3[9]–17[10] M☉
Radius263[9] R☉
Luminosity170,000[9] L☉
Surface gravity (log g)1.0[6] cgs
Temperature7,341[6] K
Metallicity-0.24[6]
Rotational velocity (v sin i)23[11] km/s
Age20[12] Myr
C
Mass21[8] M☉
Radius53[8] R☉
Luminosity83,000[13] L☉
Surface gravity (log g)2.05[13] cgs
Temperature15,500[13] K
Rotational velocity (v sin i)35[13] km/s
Other designations
34 Cassiopeiae, HR 382, CCDM J01200+5813, ADS 1073
A: HD 7927, HIP 6242, BD+57°260, SAO 22191, GC 1594
C: HD 7902, HIP 6229, BD+57°257, SAO 22187, GC 1590, NSV 466
Database references
SIMBADdata

Phi Cassiopeiae (φ Cas, φ Cassiopeiae) is a multiple star in the constellation Cassiopeia with a combined apparent magnitude of +4.95. The two brightest components are A and C, sometimes called φ1 and φ2 Cas. φ Cas A is an F0 bright supergiant of magnitude 4.95 and φ Cas C is a 7.08 magnitude B6 supergiant at 134".

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d 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.
  3. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. ^ a b c d 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. Bibcode:2002yCat.2237....0D.
  5. ^ Mermilliod, J. C.; Mayor, M.; Udry, S. (2008). "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters". Astronomy and Astrophysics. 485 (1): 303–314. Bibcode:2008A&A...485..303M. CiteSeerX 10.1.1.30.7545. doi:10.1051/0004-6361:200809664.
  6. ^ a b c d Kovtyukh, V. V.; Gorlova, N.; Belik, S. I. (2012). "Accurate luminosities from the oxygen 7771-4 a triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society. 423 (4): 3268. arXiv:1204.4115v1. Bibcode:2012MNRAS.423.3268K. doi:10.1111/j.1365-2966.2012.21117.x. S2CID 118683158.
  7. ^ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (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. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  8. ^ a b c Leitherer, C.; Wolf, B. (1984). "Early-type stars in OB associations in the infrared. I Extinction law and IR excesses". Astronomy and Astrophysics. 132: 151. Bibcode:1984A&A...132..151L.
  9. ^ a b c Rosenzweig, P.; Anderson, L. (1993). "A determination of the basic atmospheric parameters of Phi Cassiopeiae". The Astrophysical Journal. 411: 207. Bibcode:1993ApJ...411..207R. doi:10.1086/172820.
  10. ^ Cite error: The named reference ferro was invoked but never defined (see the help page).
  11. ^ Evans, Christopher J.; Howarth, Ian D. (2003). "Characteristics and classification of A-type supergiants in the Small Magellanic Cloud". Monthly Notices of the Royal Astronomical Society. 345 (4): 1223. arXiv:astro-ph/0308125. Bibcode:2003MNRAS.345.1223E. doi:10.1046/j.1365-2966.2003.07038.x. S2CID 15290757.
  12. ^ Cite error: The named reference zhang was invoked but never defined (see the help page).
  13. ^ a b c d McErlean, N. D.; Lennon, D. J.; Dufton, P. L. (1999). "Galactic B-supergiants: A non-LTE model atmosphere analysis to estimate atmospheric parameters and chemical compositions". Astronomy and Astrophysics. 349: 553. Bibcode:1999A&A...349..553M.