SS Virginis

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[4] 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.[5] 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.[4] 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.[6]

SS Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension  12h 25m 14.3952s[1]
Declination +00° 46′ 10.9467″[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: −1.448±0.228[1] mas/yr
Dec.: 0.571±0.151[1] mas/yr
Parallax (π)1.4348 ± 0.1018[1] mas
Distance2,300 ± 200 ly
(700 ± 50 pc)
Other designations
SS Vir, HIP 120212, HD 108105, BD+01° 2694, TYC 282-753-1
Database references
SIMBADdata

The location of SS Virginis is two degrees north-following of η Virginis (Eta Virginis, Zaniah).

References
Citations
  1. 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.
  2. "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 February 2017.
  3. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Bibcode:1953GCRV..C......0W. Cite journal requires |journal= (help)
  4. 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.
  5. "SS Virginis". American Association of Variable Star Observers. Retrieved 14 July 2012.
  6. 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.


References
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