HR 6594

From WikiProjectMed
Jump to navigation Jump to search
HR 6594
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 41m 58.632s[1]
Declination +15° 57′ 08.76″[1]
Apparent magnitude (V) 5.54[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type F4 Vw[4]
U−B color index −0.05[5]
B−V color index +0.387±0.012[2]
Astrometry
Radial velocity (Rv)−43.7[6] km/s
Proper motion (μ) RA: −1.868 mas/yr[1]
Dec.: +101.120 mas/yr[1]
Parallax (π)28.5131 ± 0.0532 mas[1]
Distance114.4 ± 0.2 ly
(35.07 ± 0.07 pc)
Absolute magnitude (MV)2.74[7]
Details
HR 6594 A
Mass1.34[8] M☉
Radius0.97[9] R☉
Luminosity6.17[2] L☉
Surface gravity (log g)4.07[3] cgs
Temperature6,615[3] K
Metallicity [Fe/H]−0.04[10] dex
Rotational velocity (v sin i)31.7[3] km/s
Age1.2[8] Gyr
Other designations
BD−16° 3256, HD 160910, HIP 86623, HR 6594, SAO 103033[11]
Database references
SIMBADdata

HR 6594 is the Bright Star Catalogue designation for a binary star[12] system in the northern constellation of Hercules. It is faintly visible to the naked eye with an apparent visual magnitude of 5.54;[2] according to the Bortle scale, it is sufficiently bright to be visible from dark suburban skies. The distance to this system, as determined using parallax measurements,[1] is about 114 light years. It is drifting closer with a heliocentric radial velocity of −43.7 km/s,[6] and is predicted to come as near as 47 light-years in 686,000 years.[2] On the celestial sphere it is located near the star Alpha Ophiuchi; their projected separation is just 3 light years, although their actual separation is much greater.[13]

The primary is an F-type main sequence star with a stellar classification of F4 Vw, where the w indicates relatively weak metallic features in the ultraviolet spectrum.[4] This star has 134% of the Sun's mass,[8] but only 97% of the solar radius.[9] It is spinning with a projected rotational velocity of 31.7 km/s,[3] and is around 1.2 billion years old.[8] The effective temperature of the outer atmosphere is 6,615 K,[3] giving it the yellow-white hue of an F-type star.[14] The abundance of elements other than hydrogen or helium, what astronomers term the metallicity, is similar to that in the Sun.[10]

It has a magnitude 9.38 companion star orbiting with a 144-year period, a semimajor axis spanning 1.04 arcseconds, and an eccentricity of 0.42.[12] There is a third, visual companion of magnitude 14.46 at an angular separation of 154.70 arcseconds along a position angle of 271°, as of 2001.[15]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c d e 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. ^ a b c d e f Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.[permanent dead link]
  4. ^ a b Barry, Don C. (1970), "Spectral Classification of A and F Stars", Astrophysical Journal Supplement, 19: 281, Bibcode:1970ApJS...19..281B, doi:10.1086/190209.
  5. ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  6. ^ a b Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
  7. ^ Boesgaard, A. M.; Tripicco, M. J. (April 15, 1986), "Lithium in early F dwarfs", Astrophysical Journal, Part 1, 303: 724–739, Bibcode:1986ApJ...303..724B, doi:10.1086/164120.
  8. ^ a b c d 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.
  9. ^ a b Pasinetti-Fracassini, L. E.; et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  10. ^ a b Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  11. ^ "HR 6594". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-12.
  12. ^ a b Malkov, O. Yu.; et al. (October 2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69.
  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, arXiv:astro-ph/0703089, Bibcode:2007ApJ...661..944R, doi:10.1086/517516, S2CID 42241365.
  14. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
  15. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.
Retrieved from "https://mdwiki.org/wiki/HR_6594"