6 Hydrae

6 Hydrae
Observationsdata
Epok: J2000.0
StjärnbildVattenormen
Rektascension08t 40m 01,47182s[1]
Deklination-12° 28′ 31,3433″[1]
Skenbar magnitud ()+4,98[2]
Stjärntyp
SpektraltypK3 III[3]
B–V1,415 ± 0,001[2]
Astrometri
Radialhastighet ()-7,8 ± 0,6[4] km/s
Egenrörelse (µ)RA: -81,619[1] mas/år
Dek.: -1,646[1] mas/år
Parallax ()8,7394 ± 0,1769[1]
Avstånd373 ± 8 lå (114 ± 2 pc)
Absolut magnitud ()-0,40[2]
Detaljer
Radie32,7+0,5-2,6[1] R☉
Luminositet267 ± 6[1] L☉
Temperatur4 080+173-30[1] K
Metallicitet-0,21[5] dex
Andra beteckningar
BD-11 2420, FK5 325, GSC 05437-02459, HD 73840, HIC 42509, HIP 42509, HR 3431, IRAS 08376-1217, IRC -10200, 2MASS J08400148-1228313, PLX 2068, PPM 220446, RAFGL 4705S, SAO 154515, TYC 5437-2459-1, YZC 11 3331, Gaia DR2 5747442879511136640, Gaia DR1 5747442875216347776 [6]

6 Hydrae, som är stjärnans Flamsteed-beteckning, är en ensam stjärna[7] belägen i den sydvästra delen av stjärnbilden Vattenormen och har även Bayer-beteckningen a Hydrae. Den har en skenbar magnitud på 4,98[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 8,7[1] mas, beräknas den befinna sig på ett avstånd på ca 373 ljusår (ca 114 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –8 km/s.[4] Utifrån dess egenrörelse listade Eggen (1995) den som en trolig medlem i superhopen IC 2391.[8]

Egenskaper

6 Hydrae är en orange till gul jättestjärna av spektralklass K3 III,[3] som anger att den har förbrukat förrådet av väte i dess kärna och utvecklats bort från huvudserien. Den har en radie som är ca 33[1] solradier och utsänder från dess fotosfär ca 267[1] gånger mera energi än solen vid en effektiv temperatur av ca 4 100[1] K.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 6 Hyrae, 26 december 2019.

Noter

  1. ^ [a b c d e f g h i j k l] 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] 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] Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. ^ [a b] 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, A61.
  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. ^ "6 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-04-23.
  7. ^ 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.
  8. ^ Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.

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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