Astronomy:SS Virginis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 25m 14.3952s[2] |
| Declination | +00° 46′ 10.9467″[2] |
| Apparent magnitude (V) | 9.5 to 7.4 |
| Characteristics | |
| Spectral type | C53e[3] |
| Astrometry | |
| Radial velocity (Rv) | 2[4] km/s |
| Proper motion (μ) | RA: −1.448±0.228[2] mas/yr Dec.: 0.571±0.151[2] mas/yr |
| Parallax (π) | 1.4348 ± 0.1018[2] mas |
| Distance | 2,300 ± 200 ly (700 ± 50 pc) |
| 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 kelvins.[7]
The location of SS Virginis is two degrees north-following of η Virginis (Eta Virginis, Zaniah).
References
- Citations
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+SS+Vir.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 5.0 5.1 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. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2005CoSka..35...83M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. Retrieved 14 July 2012.
- ↑ "SS Virginis". American Association of Variable Star Observers. http://www.aavso.org/lcotw/ss-virginis.
- ↑ 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.
- References
- Levy, David H. (2005), Deep Sky Objects, Prometheus Books, ISBN 1-59102-361-0, https://archive.org/details/deepskyobjects00davi
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