109 Virginis
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Star in the constellation Virgo
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 46m 14.92345s[1] |
| Declination | +01° 53′ 34.3818″[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: −115.08 mas/yr [1] Dec.: −20.464 mas/yr [1] |
| Parallax (π) | 24.2814±0.2271 mas [1] |
| Distance | 134 ± 1 ly (41.2 ± 0.4 pc) |
| Details | |
| Mass | 2.40[6] M☉ |
| Radius | 2.57[6] [a] R☉ |
| Luminosity | 46.8±1.1[6] L☉ |
| Surface gravity (log g) | 3.83±0.12[7] cgs |
| Temperature | 9,420±130[6] K |
| Metallicity [Fe/H] | −0.41±0.14[7] dex |
| Rotational velocity (v sin i) | 285[8] km/s |
| Age | 320[9] Myr |
| Other designations | |
| 109 Vir, BD+02°2862, FK5 547, HD 130109, HIP 72220, HR 5511, SAO 120648[10] | |
| 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 Earth.[1] 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.[8] [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,[8] 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 2.4 times the mass of the Sun and about 2.57 times the Sun's radius.[a] It is radiating 47 times the Sun's luminosity from its photosphere at an effective temperature of 9,420 K.[6]
Notes
[edit ]- ^ a b Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:{\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10^{3.974}}}{\biggr )}^{4}\cdot 10^{1.67}}}=2.57\ R_{\odot }.}
References
[edit ]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940 . S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b 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.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b 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.
- ^ 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, Bibcode:1997A&AS..125..497A, doi:10.1051/aas:1997105 .
- ^ a b c d e Paunzen, E; Supíková, J; Bernhard, K; Hümmerich, S; Prišegen, M (2021年07月01日), "Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager", Monthly Notices of the Royal Astronomical Society, 504 (3): 3758–3772, arXiv:2105.02206 , Bibcode:2021MNRAS.504.3758P, doi:10.1093/mnras/stab1100 , ISSN 0035-8711.
- ^ a b Wu, Yue; et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics, 525: A71, arXiv:1009.1491 , Bibcode:2011A&A...525A..71W, doi:10.1051/0004-6361/201015014, S2CID 53480665.
- ^ a b c Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b c 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, arXiv:1311.7141 , Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932 , S2CID 88503488.
- ^ "109 Vir", SIMBAD , Centre de données astronomiques de Strasbourg , retrieved 2019年02月13日.
- ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788 .
- ^ Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182 .
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572 , Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.