Astronomy:109 Virginis

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Short description: Star in the constellation Virgo
109 Virginis
280px
Chart of Virgo; 109 Virginis forms the Virgin's right foot
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo[1]
Right ascension  14h 46m 14.92345s[2]
Declination +01° 53′ 34.3818″[2]
Apparent magnitude (V) +3.72[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A0 V[5]
B−V color index −0.005±0.006[1]
Variable type None[6]
Astrometry
Radial velocity (Rv)−6.1±2.7[1] km/s
Proper motion (μ) RA: −115.08[2] mas/yr
Dec.: −20.464[2] mas/yr
Parallax (π)24.2814 ± 0.2271[2] mas
Distance134 ± 1 ly
(41.2 ± 0.4 pc)
Details
Mass2.40[7] M☉
Radius2.57[7][lower-alpha 1] R☉
Luminosity46.8±1.1[7] L☉
Surface gravity (log g)3.83±0.12[8] cgs
Temperature9,420±130[7] K
Metallicity [Fe/H]−0.41±0.14[8] dex
Rotational velocity (v sin i)285[4] km/s
Age320[9] Myr
Other designations
Maenalus, 109 Vir, BD+02°2862, FK5 547, HD 130109, HIP 72220, HR 5511, SAO 120648[10]
Database references
SIMBADdata

109 Virginis, also named Maenalus,[11] is a single,[9] white-hued star in the zodiac constellation of Virgo, located some 134.5 light years away from Earth.[2] It is the seventh-brightest member of this constellation, having an apparent visual magnitude of +3.72.[3]

This is an A-type main-sequence star with a stellar classification of A0 V,[5] and is a suspected chemically peculiar star.[4][12] However, Abt and Morrell (1995) gave it a class of A0 IIInn,[13] matching a giant star with "nebulous" lines. It is spinning rapidly with a projected rotational velocity of 285 km/s,[4] which is giving the star an oblate shape with an equatorial bulge that is an estimated 31% larger than the polar radius.[14] 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.[lower-alpha 1] It is radiating 47 times the Sun's luminosity from its photosphere at an effective temperature of 9,420 K.[7]

109 Virginis was the brightest star in the obsolete constellation Mons Maenalus, representing a mountain in the Peloponnese, Greece.[15] The IAU Working Group on Star Names approved the name Maenalus for 109 Virginis on 15 April 2026, after the obsolete constellation.[11]

Notes

  1. ↑ 1.0 1.1 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:(5,772103.974)4⋅101.67=2.57 R⊙.

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 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. 
  4. ↑ 4.0 4.1 4.2 4.3 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. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Paunzen, E; Supíková, J; Bernhard, K; Hümmerich, S; Prišegen, M (2021-07-01), "Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager", Monthly Notices of the Royal Astronomical Society 504 (3): 3758–3772, doi:10.1093/mnras/stab1100, ISSN 0035-8711, Bibcode: 2021MNRAS.504.3758P. 
  8. ↑ 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. ↑ 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. 
  10. ↑ "109 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=109+Vir. 
  11. ↑ 11.0 11.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  12. ↑ 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. 
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ Ian Ridpath's Star Tales - Mons Maenalus



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