Astronomy:69 Virginis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 27m 27.16348s[1] |
| Declination | −15° 58′ 24.8980″[1] |
| Apparent magnitude (V) | 4.76[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch |
| Spectral type | K0 III-IIIb CN1.5 CH0.5[3] |
| U−B color index | +1.06[4] |
| B−V color index | +1.09[4] |
| Astrometry | |
| Radial velocity (Rv) | −12.9±0.5[5] km/s |
| Proper motion (μ) | RA: −121.016[1] mas/yr Dec.: +21.197[1] mas/yr |
| Parallax (π) | 12.5871 ± 0.2367[1] mas |
| Distance | 259 ± 5 ly (79 ± 1 pc) |
| Absolute magnitude (MV) | 0.09[2] |
| Details[6] | |
| Mass | 3.51±0.94 M☉ |
| Radius | 15[7] R☉ |
| Luminosity | 87.1[7] L☉ |
| Surface gravity (log g) | 2.70±0.11 cgs |
| Temperature | 4,909±92 K |
| Metallicity [Fe/H] | 0.11[8] dex |
| Rotational velocity (v sin i) | 4.3[7] km/s |
| Age | 288+343 −156 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
69 Virginis is a single[10] star in the zodiac constellation of Virgo, located about 259 light years away. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.76,[2] although it is a suspected variable that may range in magnitude from 4.75 down to 4.79.[11] This object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s.[5] The light from this star is polarized due to intervening interstellar dust.[12]
This is an evolved K-type giant star with a stellar classification of K0 III-IIIb CN1.5 CH0.5,[3] showing overabundances of CN and CH molecules in the spectrum. It is a red clump giant, which indicates is on the horizontal branch generating energy via helium fusion at its core.[13] The star is about 288 million years old with 3.5[6] times the mass of the Sun and 15[7] times the Sun's radius. It is radiating 87[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,909 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.2 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 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Hoffleit, Dorrit; Jaschek, Carlos (1991), "The Bright star catalogue", New Haven, Bibcode: 1991bsc..book.....H
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637x/817/1/40, Bibcode: 2016ApJ...817...40F.
- ↑ 7.0 7.1 7.2 7.3 7.4 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ Meléndez, J. et al. (June 2008), "Chemical similarities between Galactic bulge and local thick disk red giant stars", Astronomy and Astrophysics 484 (3): L21–L25, doi:10.1051/0004-6361:200809398, Bibcode: 2008A&A...484L..21M.
- ↑ "69 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=69+Vir.
- ↑ 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.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/s1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ Leroy, J. L. (July 1993), "A Polarimetric Investigation on Interstellar Dust Within 50-PARSECS from the Sun", Astronomy and Astrophysics 274 (1): 203, Bibcode: 1993A&A...274..203L.
- ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A.
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