Astronomy:SS Virginis

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Short description: Star in the constellation Virgo
SS Virginis
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The visual band light curve of SS Virginis, from AAVSO data[1]
Observation data
Equinox J2000.0]] (ICRS)
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[3] mas
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. Max Wolf and Gisela Wolf announced the discovery of this star, from photographs taken at Heidelburg Observatory in 1905.[11] 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.[12] 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

  1. ↑ "Download Data". AAVSO. https://www.aavso.org/data-download. 
  2. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  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. doi:10.3847/1538-4357/aa704d. Bibcode: 2017ApJ...841...33M. 
  6. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W. 
  7. ↑ 7.0 7.1 7.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ 8.0 8.1 8.2 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. doi:10.1051/0004-6361:20054669. Bibcode: 2006A&A...451.1041R. 
  9. ↑ Siderud, Emelie (2020). Dust emission modelling of AGB stars. https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423949. 
  10. ↑ "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+SS+Vir. 
  11. ↑ Wolf, M.; Wolf, G. (1905). "New Variable 78.1905 Virginis". Popular Astronomy 13: 470. https://babel.hathitrust.org/cgi/pt?id=hvd.32044077079085&seq=504. Retrieved 17 August 2025. 
  12. ↑ 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



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