Sigma Virginis

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σ Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 17m 36.28327s[1]
Declination +05° 28′ 11.5221″[1]
Apparent magnitude (V) 4.86[2]
Characteristics
Spectral type M1 III[3]
U−B color index +1.86[2]
B−V color index +1.62[2]
Astrometry
Radial velocity (Rv) −28.26±0.30[4] km/s
Proper motion (μ) RA: −6.06[1] mas/yr
Dec.: +9.14[1] mas/yr
Parallax (π) 4.83 ± 0.19[1] mas
Distance 680 ± 30 ly
(207 ± 8 pc)
Details
Luminosity 1,734[5] L
Temperature 3,800[5] K
Other designations
σ Vir, 60 Virginis, BD+06° 2722, FK5 1344, HD 115521, HIP 64852, HR 5015, SAO 119855.[6]

Sigma Virginis (σ Vir, σ Virginis) is a star in the zodiac constellation of Virgo. It can be faintly seen with the naked eye with a baseline apparent visual magnitude of 4.86.[2] Based upon parallax measurements, the distance to this star is roughly 680 light years.

This is an evolved red giant star with a stellar classification of M1 III.[3] It is a variable star with a brightness that ranges from magnitude +4.77 to +4.86.[7] This variation has pulsation periods of 23.4, 24.3, 27.9, and 34.1 days.[3] The effective temperature of the stellar atmosphere is around 3,800 K, and it shines with 1,734 times the luminosity of the Sun.[5]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b c Tabur, V.; Bedding, T. R. (2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–61, arXiv:0908.3228Freely accessible, Bibcode:2009MNRAS.400.1945T, doi:10.1111/j.1365-2966.2009.15588.x. 
  4. ^ Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579Freely accessible, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 
  5. ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  6. ^ "sig Vir -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-16. 
  7. ^ Kukarkin, B. V.; et al. (1981), Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars), Moscow: Academy of Sciences USSR Shternberg, Bibcode:1981NVS...C......0K.