Wikipedia
60 Herculis
60 Herculis is a single[13] star located 134[1] light years away from the Sun in the northern constellation of Hercules,[12] and is positioned just seven[14] degrees away from Rasalgethi (Alpha Herculis). It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.871.[2] This star is moving closer to the Earth with a heliocentric radial velocity of −4 km/s.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 05m 22.69066s[1] |
| Declination | +12° 44′ 26.9816″[1] |
| Apparent magnitude (V) | 4.871[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A3V[4] or A4IV[5] |
| U−B color index | +0.12[6] |
| B−V color index | +0.125±0.006[7] |
| Astrometry | |
| Radial velocity (Rv) | −4.2±2[8] km/s |
| Proper motion (μ) | RA: +49.805[1] mas/yr Dec.: −12.030[1] mas/yr |
| Parallax (π) | 24.3967 ± 0.2232 mas[1] |
| Distance | 134 ± 1 ly (41.0 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.83[7] |
| Details | |
| Mass | 1.93±0.01[3] M☉ |
| Radius | 1.9[9] R☉ |
| Luminosity | 17.159[3] L☉ |
| Surface gravity (log g) | 4.19±0.03[10] cgs |
| Temperature | 8,299[3] K |
| Rotational velocity (v sin i) | 117[3] km/s |
| Age | 327[11] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Abt and Morrell (1995) assigned this star a stellar classification of A3V,[4] matching an ordinary A-type main-sequence star. However, earlier studies gave it a luminosity class of IV,[5] which suggested it is a subdwarf star. It has a projected rotational velocity of 117 km/s,[3] which is creating an equatorial bulge that is 5% larger than the star's polar radius.[15] The star is 327[11] million years old with 1.9[3] times the Sun's mass. It is radiating 17[3] times the luminosity of the Sun from its photosphere at an effective temperature of 8,299 K.[3]
References
- ^ a b c d e f 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.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ a b c d e f g h i Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ a b Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b 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.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
- ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
- ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ a b "60 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-14.
- ^ 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.
- ^ Redfield, Seth; et al. (June 2007). "Spitzer Limits on Dust Emission and Optical Gas Absorption Variability around Nearby Stars with Edge-on Circumstellar Disk Signatures". The Astrophysical Journal. 661 (2): 944–971. arXiv:astro-ph/0703089. Bibcode:2007ApJ...661..944R. doi:10.1086/517516. S2CID 42241365.
- ^ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.