51 Hydrae

51 Hydrae
Observationsdata
Epok: J2000.0
StjärnbildVattenormen
Rektascension14t 23m 05,77393s[1]
Deklination-27° 45′ 14,4609″[1]
Skenbar magnitud ()+4,78[2]
Stjärntyp
SpektraltypK4 III[3]
B–V+1,300 ± 0,040[2]
Astrometri
Radialhastighet ()+19,7 ± 0,9[2] km/s
Egenrörelse (µ)RA: -202,476[1] mas/år
Dek.: -117,186[1] mas/år
Parallax ()19,2042 ± 0,2252[1]
Avstånd170 ± 2 lå (52,1 ± 0,6 pc)
Absolut magnitud ()1,36[2]
Detaljer
Massa1,31[4] M☉
Radie13,47+0,48-1,26[1] R☉
Luminositet54,9+0,8-1,5[1] L☉
Temperatur4 255 ± 31[4] K
Metallicitet0,08[5] dex
Andra beteckningar
CD-27 9803, CPD-27 4954, HD 125932, HIC 70306, HIP 70306, HR 5381, IRAS 14201-2731, IRC -30220, 2MASS J14230579-2745143, NLTT 37123, NSV 6648, PLX 3261, PPM 262841, SAO 182483, TYC 6740-785-1, Gaia DR2 6269720523431409536 [6]


51 Hydrae, som är stjärnans Flamsteed-beteckning, är en ensam stjärna[7] belägen i den östra delen av stjärnbilden Vattenormen och har även Bayer-beteckningen k Hydrae.[6]. Den har en skenbar magnitud på 4,78[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 19,2[1] mas, beräknas den befinna sig på ett avstånd på ca 170 ljusår (ca 52 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 20 km/s.[2] Eggen (1971) listade den som medlem i Eta Cephei-gruppen av gamla diskstjärnor. [8]

Egenskaper

51 Hydrae är en orange till gul jättestjärna av spektralklass K4 III,[3] vilket betyder att den förbrukat förrådet av väte i dess kärna och expanderat bort från huvudserien. Den har en massa som är ca 1,3[4] solmassor, en radie som är ca 13,5[1] solradier och utsänder från dess fotosfär ca 55[1] gånger mera energi än solen vid en effektiv temperatur av ca 4 300[2] K.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 51 Hydrae, 30 december 2019.

Noter

  1. ^ [a b c d e f g h i j] 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.
  2. ^ [a b c d e f g] 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.
  3. ^ [a b] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ [a b c] Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466,
  5. ^ McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
  6. ^ [a b] "k Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 3 maj 2019.
  7. ^ 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
  8. ^ Eggen, O. J. (June 1971), "The ζ Herculis, σ Puppis, ∈ Indi, and η Cephei Groups of Old Disk Population Stars", Publications of the Astronomical Society of the Pacific, 83 (493): 251, Bibcode:1971PASP...83..251E, doi:10.1086/129119.

Externa länkar

v • r
Stjärnor i Vattenormen
Bayer
Flamsteed
Variabler
HD
HD 70573  · HD 72561  · HD 72659  · HD 74156  · HD 76151  · HD 81799  · HD 81809  · HD 82943  · HD 83953  · HD 84117  · HD 85859  · HD 85951  · HD 86226  · HD 86264  · HD 90156  · HD 92036  · HD 96700  · HD 96819  · HD 97023  · HD 100307  · HD 122430
Övriga
Gliese 433  · Gliese 453  · HAT-P-35 · Kelu-1  · TWA 5  · WASP-15  · WASP-25  · WASP-36

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