ET Virginis

	ET Virginis
Observationsdata; Epok: J2000.0
Stjärnbild	Jungfrun
Rektascension	14t 10m 50,48706s
Deklination	-16° 18′ 07,3105″
Skenbar magnitud ()	+4,910
Stjärntyp
Spektraltyp	M2 IIIa
U–B	+1,72
Variabeltyp	Halvregelbunden variabel
Astrometri
Radialhastighet ()	+18,58 ± 0,56 km/s
Egenrörelse (µ)	RA: +3,277 mas/år; Dek.: -10,804 mas/år
Parallax ()	5,8655 ± 0,2552
Avstånd	560 ± 20 lå (170 ± 7 pc)
Absolut magnitud ()	-0,81
Detaljer
Massa	3,24 M☉
Radie	83 R☉
Luminositet	963 L☉
Temperatur	3 899 K
Metallicitet	-0,21 ± 0,06 dex
Vinkelhastighet	2,3 ± 0,9 km/s
Andra beteckningar
	HD 123934, BD-15 3817, GSC 06138-00015, HIC 69269, HIP 69269, HR 5301, IRAS 14081-1604, IRC -20265, 2MASS J14105047-1618072, PLX 3220, PPM 228402, RAFGL 1684, SAO 158401, TYC 6138-15-1, ET Virginis, Gaia DR3 6297642105821172480, Gaia DR2 6297642174541339008

ET Virginis är en ensam, röd stjärna i stjärnbilden Jungfrun. Den kan ses med blotta ögat och har en skenbar magnitud på 4,91. Med en årlig parallaxförskjutning på 5,9 mas, är den belägen 560 ljusår från solen. Den rör sig bort från solsystemet med en heliocentrisk radialhastighet av +18,6 km/s, efter att ha varit inom 177 ljusår från solen för cirka 6,3 miljoner år sedan.

Observation

År 1971 tillkännagav N.R. Stokes att stjärnan, då kallad HD 123934, är en "kvasiperiodisk" variabel stjärna. Den fick dess variabelbeteckning, ET Virginis, år 1972.

ET Virginis Pulseringsperioder
Period (Dygn)	22,6	23,8	36,4	37,6	39,8	48,8	259,1
Amplitud (magnitud)	0,021	0,023	0,018	0,027	0,021	0,019	0,032

Egenskaper

ET Virginis är en utvecklad röd jättestjärna av spektralklass M2 IIIa. Det är en halvregelbunden variabel stjärna av subtyp SRB med en magnitud som varierar från 4,80 ner till 5,00. Den uppmätta vinkeldiametern för stjärnan, efter korrigering för extremlägenas fördunkling, är 4,79 ± 0,34 mas. Med dess uppskattade avstånd beräknas den ha en radie av 83 gånger solens radie.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, ET Virginis, 17 december 2025.

Noter

1 2 3 4 5 6 7 8 Brown, 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 at VizieR.
1 2 3 Soubiran, 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.
1 2 Keenan, 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.
1 2 Samus', 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.
1 2 de 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.
1 2 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.
↑ 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.
↑ https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD+123934 Arkiverad 20 maj 2026 hämtat från the Wayback Machine.. Hämtad 2025-12-24.
↑ "HD 123934". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 16 augusti 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.
1 2 Tabur, 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.
↑ 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. Hämtad 12 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. Hämtad 12 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.

[B-1] 1 2 3 4 5 6 7 8 Brown, 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 at VizieR.

[C-2] 1 2 3 Soubiran, 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.

[D-3] 1 2 Keenan, 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.

[E-4] 1 2 Samus', 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.

[F-5] 1 2 de 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.

[G-6] 1 2 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.

[H-7] 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.

[I-8] 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.

[J-9] 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.

[K-10] 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.

[SIMBAD-11] ttps://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD+123934 Arkiverad 20 maj 2026 hämtat från the Wayback Machine.. Hämtad 2025-12-24.

[L-12] "HD 123934". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 16 augusti 2018.

[M-13] 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.

[A-14] 1 2 Tabur, 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.

[N-15] 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. Hämtad 12 december 2024.

[O-16] 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. Hämtad 12 december 2024.

[P-17] 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.