Astronomy:29 Herculis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 351 ± 10 ly (108 ± 3 pc) |
| Absolute magnitude (MV) | −0.17[5] |
| Details | |
| Mass | 1.19[6] M☉ |
| Radius | 42.05+0.45 −1.81[7] R☉ |
| Luminosity | 384±19[7] L☉ |
| Surface gravity (log g) | 1.79±0.28[8] cgs |
| Temperature | 3,958±25[6] K |
| Metallicity [Fe/H] | −0.18±0.09[8] dex |
| Rotational velocity (v sin i) | 5.4[9] km/s |
| Age | 6.53[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 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, doi:10.1086/511753, Bibcode: 2007ApJS..171..146S.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 7.0 7.1 7.2 7.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics 538: A143, doi:10.1051/0004-6361/201118065, Bibcode: 2012A&A...538A.143K.
- ↑ 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ 10.0 10.1 "h Her". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=h+Her.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
- ↑ Franchini, M. et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal 601 (1): 485–499, doi:10.1086/380443, Bibcode: 2004ApJ...601..485F.
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