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SS Virginis
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| 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] |
| Distance | 2,300 ± 200 ly (700 ± 50 pc) |
| Details | |
| Mass | 3.2[7] M☉ |
| Radius | 500[8] R☉ |
| Luminosity | 5,400[9] L☉ |
| Surface gravity (log g) | 1.86[7] cgs |
| Temperature | 2,445[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 | |
| SIMBAD | data |
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
[edit]- ^ "Download Data". International Variable Star Index. AAVSO. Retrieved 1 October 2021.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ 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.
- ^ 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.
- ^ Siderud, Emelie (2020). Dust emission modelling of AGB stars.
- ^ "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 February 2017.
- ^ Wolf, M.; Wolf, G. (1905). "New Variable 78.1905 Virginis". Popular Astronomy. 13: 470. Retrieved 17 August 2025.
- ^ 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
- Levy, David H. (2005), Deep Sky Objects, Prometheus Books, ISBN 1-59102-361-0
