Astronomy:60 Herculis

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Short description: White-hued star in the constellation Hercules
60 Herculis
Location of 60 Herculis (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distance134 ± 1 ly
(41.0 ± 0.4 pc)
Absolute magnitude (MV)1.83[7]
Details
Mass2.04±0.31[9] M☉
Radius1.89[9] R☉
Luminosity15.2[9] L☉
Surface gravity (log g)4.20[9] cgs
Temperature8,299[9] K
Rotational velocity (v sin i)117[3] km/s
Age327[10] Myr
Other designations
60 Her, BD+12°3142, FK5 635, HD 154494, HIP 83613, HR 6355, SAO 102584[11]
Database references
SIMBADdata

60 Herculis is a single[12] star located 134[1] light years away from the Sun in the northern constellation of Hercules,[11] and is positioned just seven[13] 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]

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.[14] The star is 327 million years old[10] with 2.0 times the Sun's mass.[9] It is radiating 15 times the luminosity of the Sun from its photosphere at an effective temperature of 8,299 K.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 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. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A. 
  5. ↑ 5.0 5.1 Cowley, A. et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C. 
  6. ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode: 1953GCRV..C......0W. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. 
  11. ↑ 11.0 11.1 "60 Her". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=60+Her. 
  12. ↑ 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. 
  13. ↑ 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. doi:10.1086/517516. Bibcode: 2007ApJ...661..944R. 
  14. ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V. 



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