SS Virginis

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SS Virginis
SSVirLightCurve.png
The visual band light curve of SS Virginis, from AAVSO data [1]
Observation data
Epoch J2000       Equinox J2000
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  mas [2]
Distance 2,300 ± 200  ly
(700 ± 50  pc)
Details [5]
Radius 610 [a]   R☉
Luminosity 5,400  L☉
Temperature 2,000  K
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 [6] 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. [7] Its spectral class is C63e. Because it is so rich in carbon, SS Virginis is classified as a carbon star. 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. [6] 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. [8]

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

Notes

  1. ↑ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772  K:

References

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 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.
  3. ↑ "V* SS Vir". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 25 February 2017.
  4. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  5. ↑ Siderud, Emelie (2020). Dust emission modelling of AGB stars.
  6. 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 (2): 83–106. Bibcode:2005CoSka..35...83M . Retrieved 14 July 2012.
  7. ↑ "SS Virginis". American Association of Variable Star Observers . Retrieved 14 July 2012.
  8. ↑ 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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