SS Virginis

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SS Virginis

The visual band light curve of SS Virginis, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo[2]
Right ascension 12h 25m 14.3952s[3]
Declination +00° 46′ 10.9467″[3]
Apparent magnitude (V) 6.0 - 9.6[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type C63e (Ne)[4]
Variable type SRa[4]
Astrometry
Radial velocity (Rv)2[6] km/s
Proper motion (μ) RA: −1.448±0.228[3] mas/yr
Dec.: 0.571±0.151[3] mas/yr
Parallax (π)1.4348±0.1018 mas[3]
Distance2,300 ± 200 ly
(700 ± 50 pc)
Details
Mass3.2[7] M☉
Radius500[8] R☉
Luminosity5,400[9] L☉
Surface gravity (log g)1.86[7] cgs
Temperature2,445[8] K
Metallicity [Fe/H]−0.38[7] dex
Other designations
SS Vir, BD+01°2694, HD 108105, HIP 120212, TYC 282-753-1[10]
Database references
SIMBADdata

SS Virginis is a semiregular variable star that appears with a strong red hue. It varies in apparent magnitude from a maximum of 6.0 to a minimum of 9.6 over a typical period of 361 days. Its spectral class is C63e, indicating that SS Virginis is a carbon star. SS Virginis has a hydrogen-alpha emission line that varies widely, synchronized with the overall variations in light. The line becomes far more prominent as the star becomes brighter.[11] Observations made in the near-infrared spectrum indicate that it has a radius of 500 solar radii, and its temperature is between 2,405 and 2,485 K.[8]

The location of SS Virginis is two degrees north-following of η Virginis.

References

[edit]
  1. ^ "Download Data". International Variable Star Index. AAVSO. Retrieved 1 October 2021.
  2. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  3. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ a b c 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.
  5. ^ Montez, Rodolfo, Jr.; Ramstedt, Sofia; Kastner, Joel H.; Vlemmings, Wouter; Sanchez, Enmanuel (2017). "A Catalog of GALEX Ultraviolet Emission from Asymptotic Giant Branch Stars". The Astrophysical Journal. 841 (1): 33. arXiv:1705.05371. Bibcode:2017ApJ...841...33M. doi:10.3847/1538-4357/aa704d.
  6. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  7. ^ a b c 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. ^ a b c Richichi, A.; Chandrasekhar, T. (1 June 2006). "Near-infrared observations of the carbon stars TU Geminorum and SS Virginis at milliarcsecond resolution". Astronomy and Astrophysics. 451 (3): 1041–1044. Bibcode:2006A&A...451.1041R. doi:10.1051/0004-6361:20054669.
  9. ^ Siderud, Emelie (2020). Dust emission modelling of AGB stars.
  10. ^ "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 February 2017.
  11. ^ Mikulášek, Z.; Gráf, T. (2005). "Atlas of Hα emission lines and V light curves of 30 carbon Miras". Astronomical Institute of the Slovak Academy of Sciences. 35 (2): 83–106. Bibcode:2005CoSka..35...83M.


References