SS Virginis

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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
SS Vir, HIP 120212, HD 108105, BD+01° 2694, TYC 282-753-1
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[edit]

Citations
  1. ^ a b Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335. Bibcode:1998A&A...335L..65H. 
  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. 
  4. ^ a b 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. 
  5. ^ a b 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. 
  6. ^ "SS Virginis". American Association of Variable Star Observers. Retrieved 14 July 2012. 
  7. ^ 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