SS Cephei

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SS Cephei
SS Cephei SDSS Red.png
SS Cephei, as seen during the Sloan Digital Sky Survey
Observation data
Epoch J2000        Equinox J2000
Constellation Cepheus [1]
Right ascension 03h 49m 30.0153s [2]
Declination +80° 19′ 20.902″ [2]
Apparent magnitude  (V)6.9 - 7.9 [3]
Characteristics
Evolutionary stage AGB [4]
Spectral type M5III [5]
Variable type SRb [3]
Astrometry
Radial velocity (Rv)−46.87±0.09 [6] km/s
Proper motion (μ)RA: −4.911 [2] mas/yr
Dec.: 12.062 [2] mas/yr
Parallax (π)3.9187±0.1886  mas [2]
Distance 830 ± 40  ly
(260 ± 10  pc)
Absolute magnitude  (MV)+0.13 [5]
Details
Mass 3.7 [7]   M☉
Radius 239 [8]   R☉
Luminosity 5,021 [8]   L☉
Surface gravity (log g)2.33 [7]   cgs
Temperature 3,830 [7]   K
Metallicity [Fe/H]−0.32 [7]   dex
Other designations
BD+79°110, HD  22689, HIP  17881, SAO  594 [9]
Database references
SIMBAD data

SS Cephei is a semiregular variable star in the constellation Cepheus. It is of spectral type M5III, and has an estimated temperature of about 3,700 K. The star is about 830 light-years (260 parsecs) from Earth. The brightness of SS Cephei varies between magnitude 6.9 and 7.9.

A light curve for SS Cephei, plotted from Hipparcos data SSCepLightCurve.png
A light curve for SS Cephei, plotted from Hipparcos data

See also

References

  1. ↑ "obj-Cep". britastro.org. Retrieved 2024-09-27.
  2. 1 2 3 4 5 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.
  3. 1 2 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  4. ↑ Olofsson, H.; González Delgado, D.; Kerschbaum, F.; Schöier, F. L. (2002). "Mass loss rates of a sample of irregular and semiregular M-type AGB-variables". Astronomy and Astrophysics. 391 (3): 1053. arXiv: astro-ph/0206172 . Bibcode:2002A&A...391.1053O. doi:10.1051/0004-6361:20020841.
  5. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  6. ↑ Famaey, B.; et al. (May 2009). "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics. 498 (2): 627–640. arXiv: 0901.0934 . Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. S2CID   18739721.
  7. 1 2 3 4 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  8. 1 2 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 .
  9. ↑ "V* SS Cep". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-02-28.
  10. ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN   9290923997 . Retrieved 3 October 2024.


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