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16 Virginis

From Wikipedia, the free encyclopedia
Star in the constellation Virgo
16 Virginis
Location of 16 Virginis (circled in red)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationVirgo[1]
Right ascension12h 20m 20.98133s[2]
Declination+03° 18′ 45.2604″[2]
Apparent magnitude (V)4.96[3]
Characteristics
Evolutionary stagered clump[4]
Spectral typeK0.5 IIIb Fe−0.5[5]
B−Vcolor index1.16[3]
Astrometry
Radial velocity (Rv)+36.66±0.17[6] km/s
Proper motion (μ)RA: −292.95[2]mas/yr
Dec.: −63.58[2]mas/yr
Parallax (π)10.59±0.25 mas[2]
Distance308 ± 7 ly
(94 ± 2 pc)
Absolute magnitude (MV)+0.10[1]
Details
Mass1.62[3] M☉
Radius19.3[7] R☉
Luminosity131.8[3] L☉
Surface gravity (log g)1.77[7] cgs
Temperature4,423±32[3] K
Metallicity[Fe/H]−0.38[7] dex
Rotational velocity (v sin i)4.2[8] km/s
Age3.22[3] Gyr
Other designations
c Vir,16 Vir,NSV 5558,BD+04°2604,HD 107328,HIP 60172,HR 4695,SAO 119341[9]
Database references
SIMBADdata

16 Virginis is a single[10]star in thezodiacconstellation ofVirgo, located about 308[2] light years from the Sun. It has theBayer designationc Virginis;16 Virginis is theFlamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with anapparent visual magnitude of 4.96.[3] This is anIAU radial velocity standard star;[11] it is moving further from the Earth with a heliocentric radial velocity of +37 km/s.[6] The star has a relatively highproper motion, traversing thecelestial sphere at an angular rate of0.301″ per year.[12]

InChinese astronomy, 16 Virginis is called 謁者,Pinyin: Yèzhě, meaningUsher to the Court, because this star is marking itself and stand alone inUsher to the Court asterism,Supreme Palace enclosure mansion (see:Chinese constellation).[13]

This is anevolvedK-typegiant star with astellar classification ofK0.5 IIIb Fe−0.5,[5] where the suffix notation denotes a mild under-abundance of iron in thespectrum. It is ared clump giant, which indicates is on thehorizontal branch generating energy viahelium fusion at its core.[4] Theinterferometry-measuredangular diameter of this star, after correcting forlimb darkening, is1.74±0.02 mas,[14] while the physical radius is about 19 times theradius of the Sun.[7] It is about three billion years old with 1.62 times themass of the Sun and is radiating 132 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,423 K.[3]

References

[edit]
  1. ^abAnderson, 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. XHIP record for this object atVizieR.
  2. ^abcdefvan Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474 (2):653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID 18759600.
  3. ^abcdefghLuck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants",Astronomical Journal,150 (3), 88,arXiv:1507.01466,Bibcode:2015AJ....150...88L,doi:10.1088/0004-6256/150/3/88,S2CID 118505114.
  4. ^abAlves, 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.
  5. ^abKeenan, 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.
  6. ^abBrown, 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 atVizieR.
  7. ^abcdSoubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; De Brito Silva, D. (2024). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version".Astronomy and Astrophysics.682: A145.arXiv:2310.11302.Bibcode:2024A&A...682A.145S.doi:10.1051/0004-6361/202347136.
  8. ^Perdelwitz, V.; Trifonov, T.; Teklu, J. T.; Sreenivas, K. R.; Tal-Or, L. (2024). "Analysis of the public HARPS/ESO spectroscopic archive. Ca II H&K time series for the HARPS radial velocity database".Astronomy and Astrophysics.683.arXiv:2311.12438.Bibcode:2024A&A...683A.125P.doi:10.1051/0004-6361/202348263.
  9. ^"c Vir".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2019-02-10.
  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.
  11. ^Batten, A. H.; Crampton, D.; Fletcher, J. M.; Morbey, C. L. (1971), "Wavelength Standards for the Measurement of Radial Velocities",Publications of the Dominion Astrophysical Observatory,13: 441,Bibcode:1971PDAO...13..441B.
  12. ^Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)",The Astronomical Journal,129 (3):1483–1522,arXiv:astro-ph/0412070,Bibcode:2005AJ....129.1483L,doi:10.1086/427854,S2CID 2603568.
  13. ^Ridpath, Ian,"Virgo the Virgin",Startales.
  14. ^Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements",Astronomy and Astrophysics,431 (2):773–777,Bibcode:2005A&A...431..773R,doi:10.1051/0004-6361:20042039.
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