Astronomy:109 Virginis
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Short description: Star in the constellation Virgo
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 46m 14.92536s[1] |
| Declination | +01° 53′ 34.3845″[1] |
| Apparent magnitude (V) | +3.72[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| B−V color index | −0.005±0.006[4] |
| Variable type | None[5] |
| Astrometry | |
| Radial velocity (Rv) | −6.1±2.7[4] km/s |
| Proper motion (μ) | RA: −114.03[1] mas/yr Dec.: −22.13[1] mas/yr |
| Parallax (π) | 24.25 ± 0.18[1] mas |
| Distance | 134.5 ± 1.0 ly (41.2 ± 0.3 pc) |
| Details | |
| Mass | 2.58±0.02[6] M☉ |
| Radius | 2.7[7] R☉ |
| Luminosity | 62.8+1.8 −1.7[6] L☉ |
| Surface gravity (log g) | 3.83±0.12[8] cgs |
| Temperature | 9683+112 −111[6] K |
| Metallicity [Fe/H] | −0.41±0.14[8] dex |
| Rotational velocity (v sin i) | 285[6] km/s |
| Age | 320[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
109 Virginis is a single,[9] white-hued star in the zodiac constellation of Virgo, located some 134.5 light years away from the Sun. It is the seventh-brightest member of this constellation, having an apparent visual magnitude of +3.72.[2]
This is an A-type main-sequence star with a stellar classification of A0 V,[3] and is a suspected chemically peculiar star.[6][11] However, Abt and Morrell (1995) gave it a class of A0 IIInn,[12] matching a giant star with "nebulous" lines. It is spinning rapidly with a projected rotational velocity of 285 km/s,[6] which is giving the star an oblate shape with an equatorial bulge that is an estimated 31% larger than the polar radius.[13] The star is 320[9] million years old with 2.58[6] times the mass of the Sun and about 2.7[7] times the Sun's radius. It is radiating 63[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,683 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 Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode: 1990A&AS...85.1015M.
- ↑ 3.0 3.1 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
- ↑ 4.0 4.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Adelman, Saul J. (November 1997), "On the possible variability of the main sequence A stars theta Virginis and 109 Virginis", Astronomy and Astrophysics Supplement Series 125 (3): 497–499, doi:10.1051/aas:1997105, Bibcode: 1997A&AS..125..497A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 Wu, Yue et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics 525: A71, doi:10.1051/0004-6361/201015014, Bibcode: 2011A&A...525A..71W.
- ↑ 9.0 9.1 9.2 De Rosa, R. J. et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society 437 (2): 1216–1240, doi:10.1093/mnras/stt1932, Bibcode: 2014MNRAS.437.1216D.
- ↑ "109 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=109+Vir.
- ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R, https://zenodo.org/record/890529/files/article.pdf.
- ↑ Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A.
- ↑ Belle, G. T. (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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