29 Herculis

29 Herculis is a single[11] star located around 351[1] light years away from the Sun in the northern constellation of Hercules, a few degrees away from Omega Herculis. It has the Bayer designation h Herculis, while 29 Herculis is the Flamsteed designation.[10] This star is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.84.[2] It is moving further from the Earth with a heliocentric radial velocity of +3 km/s.[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.195 arc seconds per annum.[12]

29 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 16h 32m 36.29190s[1]
Declination +11° 29′ 16.9479″[1]
Apparent magnitude (V) 4.84[2]
Characteristics
Evolutionary stage giant
Spectral type K4.5 III[3]
B−V color index 1.495±0.002[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)+2.92±0.20[2] km/s
Proper motion (μ) RA: -178.84[1] mas/yr
Dec.: −79.27[1] mas/yr
Parallax (π)9.29 ± 0.26 mas[1]
Distance351 ± 10 ly
(108 ± 3 pc)
Absolute magnitude (MV)−0.17[5]
Details
Mass1.19[6] M☉
Radius42.05+0.45
−1.81[7] R☉
Luminosity384±19[7] L☉
Surface gravity (log g)1.79±0.28[8] cgs
Temperature3,958±25[6] K
Metallicity [Fe/H]−0.18±0.09[8] dex
Rotational velocity (v sin i)5.4[9] km/s
Age6.53[6] Gyr
Other designations
h Her, 29 Her, NSV 7812, BD+11°3008, FK5 3310, GC 22250, HD 149161, HIP 81008, HR 6159, SAO 102234, LTT 14915[10]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K4.5 III.[3] It displays an enhanced abundance of elements generated through the alpha process, and, in particular, has a strong enhancement of silicon.[13] 29 Herculis is a suspected variable star of unknown type, and has been measured ranging in visual magnitude from 4.82 down to 4.85.[4] It is an estimated 6.53[6] billion years old with 1.19[6] times the mass of the Sun. Having exhausted the supply of hydrogen at its core, it has expanded to 42[7] times the Sun's radius. The star is radiating 384[7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,958 K.[6]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 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. Keenan, Philip C.; McNeil, Raymond 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.
  4. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  5. Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series, 171 (1): 146–205, arXiv:astro-ph/0611464, Bibcode:2007ApJS..171..146S, doi:10.1086/511753, S2CID 13946698.
  6. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  7. 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.
  8. Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics, 538: A143, arXiv:1111.5449, Bibcode:2012A&A...538A.143K, doi:10.1051/0004-6361/201118065, S2CID 53999614.
  9. Massarotti, Alessandro; et al. (January 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.
  10. "h Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-12.
  11. 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.
  12. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  13. Franchini, M.; et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal, 601 (1): 485–499, Bibcode:2004ApJ...601..485F, doi:10.1086/380443.
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