My Lupi

My Lupi (μ)
Observationsdata
Epok: J2000
StjärnbildVargen
Rektascension15t 18m 32,02296s[1]
Deklination-47° 52′ 30,9957″[1]
Skenbar magnitud ()4,29[2]
Stjärntyp
SpektraltypB8 Ve[3]
U–B-0,41[2]
B–V-0,03[2]
Astrometri
Radialhastighet ()+14,90 ± 1,78[4] km/s
Egenrörelse (µ)RA: -29,59[1] mas/år
Dek.: -35,07[1] mas/år
Parallax ()9,72 ± 0,71[1]
Avstånd340 ± 20 lå (103 ± 8 pc)
Absolut magnitud ()-0,57[5]
Detaljer
Massa4,42 ± 0,20[3] M☉
Radie3,63[6] R☉
Luminositet603[3] L☉
Temperatur13 470 ± 500[3] K
Vinkelhastighet280 ± 20[3] km/s
Ålder112[3] miljoner år
Andra beteckningar
μ Lup, CD-47° 9860, FK5, HD 135734, HIP 74911, HR 5683, SAO 225638, WDS J15185-4753AB.[7]

My Lupi (μ Lupi, förkortad My Lup, μ Lup), som är stjärnans Bayer-beteckning, är en trippel- eller kvadruppelstjärna[8] i mellersta delen av stjärnbilden Vargen. Den har en magnitud av 4,29[2] och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 9,7 mas,[1] beräknas den befinna sig på ett avstånd av ca 340 ljusår (103 parsek) från solen.

Egenskaper

Primärstjärnan My Lupi A är en blå till vit stjärna i huvudserien av spektralklass B8 Ve,[3]. Den har en massa som är ca 4,4[3] gånger solens massa, en radie som är ca 3,6[6] gånger solens radie och avger ca 600[3] gånger mer energi än solen från dess fotosfär vid en effektiv temperatur på ca 13 500 K.[3]

Två av stjärnorna i konstellationen, My Lupi A och My Lupi B, bildar en dubbelstjärna med en vinkelseparation på 1,1 bågsekunder. My Lupi C ligger med en vinkelseparation på 22,6 bågsekunder från AB-paret, och kan vara en visuell följeslagare. Den är en stjärna i huvudserien av spektralklass A2 V. En fjärde stjärna med en vinkelseparation på 6,15 bågsekunder från primärstjärnan kan vara en brun dvärg.[8]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 3 februari 2019.

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 ^ [a b c d] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ [a b c d e f g h i j] Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society, 371: 252, arXiv:astro-ph/0606149, Bibcode:2006MNRAS.371..252L, doi:10.1111/j.1365-2966.2006.10655.x.
  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. ^ Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452.
  6. ^ [a b] https://www.universeguide.com/star/mulupi. Hämtad 2019-02-03.
  7. ^ "* mu. Lup -- Be Star". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2017-03-08.
  8. ^ [a b] Veramendi, M. E.; González, J. F. (July 2014), "Spectroscopic study of early-type multiple stellar systems. II. New binary subsystems", Astronomy & Astrophysics, 567: 10, arXiv:1405.1084, Bibcode:2014A&A...567A..35V, doi:10.1051/0004-6361/201423736, A35.

Externa länkar

v • r
Stjärnor i Vargen
Bayer
Flamsteed
Variabler
R Lupi  · S Lupi  · T Lupi  · U Lupi  · V Lupi  · W Lupi  · X Lupi  · Y Lupi  · Z Lupi  · EX Lupi  · V407 Lupi
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