Astronomy:106 Herculis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 20m 17.91482s[1] |
| Declination | +21° 57′ 40.6622″[1] |
| Apparent magnitude (V) | 4.96[2] |
| Characteristics | |
| Spectral type | M0 III[3] |
| U−B color index | +1.98[4] |
| B−V color index | +1.58[4] |
| Variable type | suspected SR[5][6] |
| Astrometry | |
| Radial velocity (Rv) | −35.20±0.29[7] km/s |
| Proper motion (μ) | RA: +18.105[1] mas/yr Dec.: -59.631[1] mas/yr |
| Parallax (π) | 8.5067 ± 0.1739[1] mas |
| Distance | 383 ± 8 ly (118 ± 2 pc) |
| Absolute magnitude (MV) | −0.664[7] |
| Details | |
| Radius | 44.32+2.70 −5.89[1] R☉ |
| Luminosity | 414.1±9.7[1] L☉ |
| Surface gravity (log g) | 1.56±0.09[3] cgs |
| Temperature | 3,789±6[3] K |
| Metallicity [Fe/H] | 0.00±0.03[3] dex |
| Rotational velocity (v sin i) | 5.0±1.0[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
106 Herculis is a variable star in the northern constellation Hercules. It is visible to the naked eye as a faint, red-hued point of light with a baseline apparent visual magnitude of 4.96.[2] Based on its parallax, it is estimated to lie 383 light-years (117 parsecs) away from the Sun.[3] The star is moving closer to the Earth with a heliocentric radial velocity of -35 km/s.[7]
Eggleton and Tokovinin (2008) listed this as a suspected binary star system consisting of two roughly equal components.[10] It appears as an ageing red giant with a stellar classification of M0III. This is a suspected semiregular variable star with a very small amplitude and a period of 40 days or more.[6] Having exhausted the supply of hydrogen at its core, it has expanded to 44[1] times the Sun's radius. It is radiating around 414[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of about 3,789 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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.
- ↑ 2.0 2.1 J. R., Ducati (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Wu, Yue et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W.
- ↑ 4.0 4.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1: B/gcvs. Bibcode: 2009yCat....102025S.
- ↑ 6.0 6.1 Percy, John R. (1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific 105: 1422. doi:10.1086/133324. Bibcode: 1993PASP..105.1422P.
- ↑ 7.0 7.1 7.2 Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (2008). "Vertical distribution of Galactic disk stars". Astronomy & Astrophysics 480 (1): 91–101. doi:10.1051/0004-6361:20078788. Bibcode: 2008A&A...480...91S.
- ↑ Zamanov, R. K. et al. (October 2008). "Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics". Monthly Notices of the Royal Astronomical Society 390 (1): 377–382. doi:10.1111/j.1365-2966.2008.13751.x. Bibcode: 2008MNRAS.390..377Z.
- ↑ "106 Her". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=106+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.
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