Astronomy:HR 6594
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: +101.120[1] mas/yr |
| Parallax (π) | 28.5131 ± 0.0532[1] mas |
| Distance | 114.4 ± 0.2 ly (35.07 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.74[7] |
| Details | |
| HR 6594 A | |
| Mass | 1.34[8] M☉ |
| Radius | 0.97[9] R☉ |
| Luminosity | 6.17[2] L☉ |
| Surface gravity (log g) | 4.07[3] cgs |
| Temperature | 6,615[3] K |
| Metallicity [Fe/H] | −0.04[10] dex |
| Rotational velocity (v sin i) | 31.7[3] km/s |
| Age | 1.2[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 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 3.2 3.3 3.4 3.5 Schröder, C. et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2.[yes|permanent dead link|dead link}}]
- ↑ 4.0 4.1 Barry, Don C. (1970), "Spectral Classification of A and F Stars", Astrophysical Journal Supplement 19: 281, doi:10.1086/190209, Bibcode: 1970ApJS...19..281B.
- ↑ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 6.0 6.1 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.
- ↑ Boesgaard, A. M.; Tripicco, M. J. (April 15, 1986), "Lithium in early F dwarfs", Astrophysical Journal, Part 1 303: 724–739, doi:10.1086/164120, Bibcode: 1986ApJ...303..724B.
- ↑ 8.0 8.1 8.2 8.3 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.
- ↑ 9.0 9.1 Pasinetti-Fracassini, L. E. et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 10.0 10.1 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, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ "HR 6594". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+6594.
- ↑ 12.0 12.1 Malkov, O. Yu. et al. (October 2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M.
- ↑ 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.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22.
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