S Cephei

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S Cephei
S Cephei by Wide-field Infrared Survey Explorer.png
S Cephei, as seen by WISE (false colour infrared)
Observation data
Epoch J2000       Equinox J2000
Constellation Cepheus
Right ascension 21h 35m 12.8233s [1]
Declination +78° 37′ 28.185″ [1]
Apparent magnitude  (V)6.6 - 12.5 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type C7,3e [4]
Variable type Mira [2]
Astrometry
Proper motion (μ)RA: 8.278 [1] mas/yr
Dec.: 0.748 [1] mas/yr
Parallax (π)2.0452±0.0697  mas [1]
Distance 1,590 ± 50  ly
(490 ± 20  pc)
Details
Mass 5.4 [5]   M☉
Radius 254 [6]   R☉
Luminosity 5,417 [6]   L☉
Surface gravity (log g)3.61 [5]   cgs
Temperature 4,032 [5]   K
Metallicity [Fe/H]−0.54 [5]   dex
Other designations
BD+77°827, HD 206362, HIP 106583, SAO 10100 [7]
Database references
SIMBAD data

S Cephei (S Cep), also designated as HD 206362, is a carbon star and Mira-type variable in the constellation Cepheus. Based on the measurement of its annual parallax by the Gaia satellite, the star is approximately ~1,590 ly (~490 pc) away from Earth.

A visual band light curve for S Cephei, plotted from ASAS-SN data SCepLightCurve.png
A visual band light curve for S Cephei, plotted from ASAS-SN data

S Cephei is a carbon star of spectral type C7.3e. [9] It is also a Mira-type variable star whose apparent magnitude varies from 6.6 to 12.5 in the form of a pulsation over a period of 484 days. [2] Its variability was discovered by Karl Hencke in 1858. [10]

See also

References

  1. 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.
  2. 1 2 3 Samus, N.N.; Kazarovets, E.V.; Durlevich, O.V.; Kireeva, N.N.; Pastukhova, E.N. "S Cep". General Catalog of Variable Stars. Lomonosov Moscow State University. Retrieved 17 December 2024.
  3. ↑ McDonald, I.; De Beck, E.; Zijlstra, A. A.; Lagadec, E. (2018). "Pulsation-triggered dust production by asymptotic giant branch stars". Monthly Notices of the Royal Astronomical Society. 481 (4): 4984. arXiv: 1809.07965 . Bibcode:2018MNRAS.481.4984M. doi: 10.1093/mnras/sty2607 .
  4. ↑ Yamashita, Y. (1975). "The C-classification of spectra of carbon stars, II". Annals of the Tokyo Astronomical Observatory. 15: 47. Bibcode:1975AnTok..15...47Y.
  5. 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.
  6. 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 .
  7. ↑ "V* S Cep". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-03-19.
  8. ↑ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 16 December 2024.
  9. ↑ Yamashita, Y. (1975). "The C-classification of spectra of carbon stars, II". Annals of the Tokyo Astronomical Observatory. 15: 47–58. Bibcode:1975AnTok..15...47Y . Retrieved 17 December 2024.
  10. ↑ "VSX : Detail for S Cephei". The International Variable Star Index. AAVSO . Retrieved 27 April 2022.
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