SS Virginis
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 25m 14.3949s[1] |
Declination | +00° 46′ 10.921″[1] |
Apparent magnitude (V) | 9.5 to 7.4 |
Characteristics | |
Spectral type | C53e[2] |
Astrometry | |
Radial velocity (Rv) | 2[3] km/s |
Proper motion (μ) | RA: -2.7[4] mas/yr Dec.: 1.3[4] mas/yr |
Other designations | |
Database references | |
SIMBAD | data |
SS Virginis is a Mira variable star that appears with a strong red hue. It varies in magnitude from a minimum of 9.5 to a maximum of 7.4[5] over a period of 361 days. It is also considered to be a semiregular variable star, as its minimum and maximum magnitude are themselves variable over a period of decades.[6] Its spectral class is C63e. Because it is so rich in carbon, SS Virginis is classified as a carbon star, along with stars like T Geminorum. SS Virginis, like all carbon Mira variables, has a hydrogen-alpha emission line that varies widely, synchronized with the overall variations in light. The hydrogen-alpha emission line becomes far more prominent as the star becomes brighter.[5] Observations made in the near-infrared spectrum indicate that it has a radius of 500 solar radii, and its temperature is between 2405 and 2485 kelvin.[7]
References
- Citations
- 1 2 Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335. Bibcode:1998A&A...335L..65H.
- ↑ "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 February 2017.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Bibcode:1953GCRV..C......0W.
- 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- 1 2 Mikulášek, Z.; Gráf, T. (2005). "Atlas of Hα emission lines and V light curves of 30 carbon Miras" (PDF). Astronomical Institute of the Slovak Academy of Sciences. 35: 83–106. Bibcode:2005CoSka..35...83M. Retrieved 14 July 2012.
- ↑ "SS Virginis". American Association of Variable Star Observers. Retrieved 14 July 2012.
- ↑ 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. Retrieved 14 July 2012.
- References
- Levy, David H. (2005), Deep Sky Objects, Prometheus Books, ISBN 1-59102-361-0