My Fornacis

My Fornacis (μ)
Observationsdata
Epok: J2000.0
StjärnbildUgnen
Rektascension02t 12m 54,46962s[1]
Deklination-30° 43′ 25,7732″[1]
Skenbar magnitud ()+5,27[2]
Stjärntyp
SpektraltypA0 V[3]
U–B-0,06[2]
B–V-0,02[2]
Astrometri
Radialhastighet ()10,0 ± 3,7[4] km/s
Egenrörelse (µ)RA: +14,10[1] mas/år
Dek.: +6,85[1] mas/år
Parallax ()10,18 ± 0,24[1]
Avstånd320 ± 8  (98 ± 2 pc)
Absolut magnitud ()+0,31[5]
Detaljer
Massa3,10[6] M
Radie2,5[7] R
Luminositet68,7[8] L
Temperatur11 745 ± 399[6] K
Vinkelhastighet320[7] km/s
Ålder188[3] miljoner år
Andra beteckningar
μ For, CD-31° 882, FK5 78, GJ 89, HD 13709, HIP 10320, HR 652, SAO 193573.[9]

My Fornacis (μ Foracis, förkortat My For, μ For) som är stjärnans Bayerbeteckning, är en ensam stjärna belägen i den västra delen av stjärnbilden Ugnen. Den har en skenbar magnitud på 5,27[2] och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 10,2[1] mas, beräknas den befinna sig på ett avstånd på ca 320 ljusår (ca 98 parsek) från solen.

Egenskaper

My Fornacis är en blå till vit stjärna i huvudserien av spektralklass A0 V.[3]. Den har en massa som är ca 3[6] gånger större än solens massa, en radie som är ca 2,5[7] gånger större än solens och utsänder från dess fotosfär ca 69[8] gånger mera energi än solen vid en effektiv temperatur av ca 11 700[6] K.

My Fornacis är en Be-stjärna som visar "central quasi emission" (CQE)-stötar i sitt spektrum på grund av omgivande material.[10] Den verkar avge ett överskott av infraröd strålning med en våglängd på 22 μm, vilket kan bero på en omkretsande stoftskiva.[11]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.

Noter

  1. ^ [a b c d e f] van 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.
  2. ^ [a b c d] Cousins, A. W. J. (1973), "UBV photometry of some southern stars", Monthly Notes of the Astronomical Society of Southern Africa, 32: 11, Bibcode:1973MNSSA..32...11C.
  3. ^ [a b c] Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  4. ^ 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. ^ 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.
  6. ^ [a b c d] David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. ^ [a b c] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. ^ [a b] McDonald, I.; et al. (November 2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  9. ^ "mu. For – Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2017-01-24.
  10. ^ Rivinius, Th.; et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics, 459 (1): 137–145, Bibcode:2006A&A...459..137R, doi:10.1051/0004-6361:20053008
  11. ^ Wu, Chao-Jian; et al. (October 2013), "Bright 22 μm Excess Candidates from the Wise All-sky Catalog and the Hipparcos Main Catalog", The Astrophysical Journal Supplement, 208 (2): 12, arXiv:1308.3848, Bibcode:2013ApJS..208...29W, doi:10.1088/0067-0049/208/2/29, 29.

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