| Observation data Epoch J2000.0 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 mas [1] |
| 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
- ^ a b c d e 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 c 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 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode: 1989ApJS...71..245K, doi: 10.1086/191373.
- ^ a b Hoffleit, Dorrit; Jaschek, Carlos (1991), "The Bright star catalogue", New Haven, Bibcode: 1991bsc..book.....H
- ^ a b 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, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv: 1511.04088, Bibcode: 2016ApJ...817...40F, doi: 10.3847/0004-637x/817/1/40, S2CID 118675933.
- ^ a b c d e 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, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ 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, arXiv: 0804.4124, Bibcode: 2008A&A...484L..21M, doi: 10.1051/0004-6361:200809398, S2CID 3201679.
- ^ "69 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-10.
- ^ 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.
- ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode: 2017ARep...61...80S, doi: 10.1134/s1063772917010085, S2CID 125853869.
- ^ 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, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
