30 Geminorum

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30 Geminorum
Observation data
Epoch J2000        Equinox J2000
Constellation Gemini
Right ascension 06h 43m 59.28697s [1]
Declination +13° 13′ 40.8188″ [1]
Apparent magnitude  (V)4.49 [2]
Characteristics
Evolutionary stage red clump [3]
Spectral type K0+ III Ca1 [4]
B−V color index 1.167±0.006 [2]
Astrometry
Radial velocity (Rv)+9.50±0.25 [5] km/s
Proper motion (μ)RA: −0.269 [1] mas/yr
Dec.: −53.503 [1] mas/yr
Parallax (π)10.9027±0.2048  mas [1]
Distance 299 ± 6  ly
(92 ± 2  pc)
Absolute magnitude  (MV)−0.25 [2]
Details
Mass 2.29±0.62 [6]   M☉
Radius 22.4+0.5
−0.8 [1]   R☉
Luminosity 188.9±4.1 [1]   L☉
Surface gravity (log g)2.18±0.11 [6]   cgs
Temperature 4,518+82
−47 [1]   K
Metallicity [Fe/H]−0.11±0.05 [6]   dex
Rotational velocity (v sin i)2.7 [5]  km/s
Age 1.20+0.31
−0.25 [6]   Gyr
Other designations
30 Gem, BD+13°1390, HD 48433, HIP 32249, HR 2478, SAO 96051, WDS J06440+1314 [7]
Database references
SIMBAD data

30 Geminorum is a suspected astrometric binary [8] star system in the northern zodiac constellation of Gemini. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.49. [2] The distance to this star, as estimated through the use of parallax, is about 299  light years. [1] It is drifting further away from the Sun with a heliocentric radial velocity of +9.5 km/s. [5]

This is an aging giant star with a stellar classification of K0+ III Ca1, [4] having exhausted the supply of hydrogen at its core and expanded to 22 [1] times the Sun's radius. The suffix notation indicates it displays an overabundance of calcium in its spectrum. It is a red clump giant, [3] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star is about 1.2 [6]  billion years old with 2.3 [6] times the Sun's mass. It is radiating 189 [1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,518 K. [1]

There is a 13th magnitude visual companion located at an angular separation of 21.20″ along a position angle of 187° from the brighter star, as of 2011. [9]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 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. 1 2 3 4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  3. 1 2 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329 , Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID   16673121.
  4. 1 2 Keenan, P. C.; McNeil, R. C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. 1 2 3 Massarotti, Alessandro; et al. (2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209 , S2CID   121883397.
  6. 1 2 3 4 5 6 Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv: 1511.04088 , Bibcode:2016ApJ...817...40F, doi: 10.3847/0004-637X/817/1/40 , S2CID   118675933.
  7. ↑ "30 Gem". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-20.
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  9. ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi: 10.1086/323920 .
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