Evolved red giant star in the constellation Virgo
ET Virginis is a single,[13] red-huedstar in the equatorialconstellation ofVirgo. It can be viewed with thenaked eye, having anapparent visual magnitude of 4.91.[3] Based upon an annualparallax shift of5.9 mas,[2] it is located 560 light years away. It is moving further from the Earth with a heliocentricradial velocity of +18.6 km/s,[6] having come within 177 ly of the Sun around 6.3 million years ago.[7]
In 1971, N. R. Stokes announced that the star, then called HD 123934, is a "quasi-periodic"variable star.[14] It received itsvariable star designation, ET Virginis, in 1972.[15]
ET Vir Pulsation Cycles[1]| Period (Days) | 22.6 | 23.8 | 36.4 | 37.6 | 39.8 | 48.8 | 259.1 |
|---|
| Amplitude (mag.) | 0.021 | 0.023 | 0.018 | 0.027 | 0.021 | 0.019 | 0.032 |
|---|
This is anevolvedred giant star with astellar classification of M2 IIIa.[4] It is asemiregular variable star of subtype SRB with a magnitude that ranges from a high of 4.80 down to 5.00.[5] The measuredangular diameter of this star, after correcting for limb darkening, is4.79±0.34 mas.[16] At its estimated distance, this yields a physical size of 83 times theradius of the Sun.
- ^abTabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants",Monthly Notices of the Royal Astronomical Society,400 (4):1945–1961,arXiv:0908.3228,Bibcode:2009MNRAS.400.1945T,doi:10.1111/j.1365-2966.2009.15588.x,S2CID 15358380.
- ^abcdefghBrown, 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.
- ^abcSoubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters",Astronomy and Astrophysics,515: A111,arXiv:1004.1069,Bibcode:2010A&A...515A.111S,doi:10.1051/0004-6361/201014247,S2CID 118362423.
- ^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,S2CID 123149047.
- ^abSamus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1",Astronomy Reports,61 (1):80–88,Bibcode:2017ARep...61...80S,doi:10.1134/S1063772917010085,S2CID 125853869.
- ^abde 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.
- ^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,S2CID 119257644.
- ^Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022), "Stellar and substellar companions from Gaia EDR3",Astronomy & Astrophysics,657: A7,arXiv:2109.10912,Bibcode:2022A&A...657A...7K,doi:10.1051/0004-6361/202142146,S2CID 237605138.
- ^Stassun, Keivan G.; et al. (2019-10-01), "The Revised TESS Input Catalog and Candidate Target List",The Astronomical Journal,158 (4): 138,arXiv:1905.10694,Bibcode:2019AJ....158..138S,doi:10.3847/1538-3881/ab3467,hdl:1721.1/124721,ISSN 0004-6256,S2CID 166227927.
- ^Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass",The Astrophysical Journal,826 (2): 14,arXiv:1604.07403,Bibcode:2016ApJ...826..171G,doi:10.3847/0004-637X/826/2/171,S2CID 119241004, 171.
- ^Zamanov, R. K.; et al. (October 2008), "Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics",Monthly Notices of the Royal Astronomical Society,390 (1):377–382,arXiv:0807.3817,Bibcode:2008MNRAS.390..377Z,doi:10.1111/j.1365-2966.2008.13751.x,S2CID 118697261.
- ^"HD 123934".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved16 August 2018.
- ^Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389 (2): 869,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID 14878976.
- ^Stokes, N. R. (1971)."The variability of M-stars".Monthly Notices of the Royal Astronomical Society.152 (2):165–195.Bibcode:1971MNRAS.152..165S.doi:10.1093/mnras/152.2.165. Retrieved12 December 2024.
- ^Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972)."58th Name-List of Variable Stars"(PDF).Information Bulletin on Variable Stars.717: 165.Bibcode:1971MNRAS.152..165S.doi:10.1093/mnras/152.2.165. Retrieved12 December 2024.
- ^Richichi, A.; et al. (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.
