V357 Carinae

V357 Carinae
Observationsdata
Epok: J2000.0
StjärnbildKölen
Rektascension09t 10m 58,086 s[1]
Deklination-58° 58′ 00,82 ″[1]
Skenbar magnitud ()+3,41 – 3,44[2]
Stjärntyp
SpektraltypB2 IV-V[3]
B–V-0,19[4]
VariabeltypFörmörkelsevariabel[5]
Astrometri
Radialhastighet ()+23,3[3] km/s
Egenrörelse (µ)RA: -16,64[1] mas/år
Dek.: +15,00[1] mas/år
Parallax ()7,30 ± 0,35[1]
Avstånd450 ± 20  (137 ± 7 pc)
Absolut magnitud ()-2,25[4]
Detaljer
Massa9,15[6] M
Radie5,0[7] R
Luminositet2 492[4] L
Temperatur21 744[7] K
Ålder18,7[8] miljoner år
Andra beteckningar
a Carinae, ALS 14930, CEL 3206, CPD-58 1419, GSC 08595-03311, HD 79351, HIC 45080, HIP 45080, HR 3659, IRAS 09096-5845, 2MASS J09105810-5858008, PPM 337673, 1RXS J091058.6-585755, SAO 236693, TD1 13681, TYC 8595-3311-1, uvby98 100079351, V357 Carinae, Gaia DR2 5300534077633482112, Gaia DR3 5300534077635861888[9]

V357 Carinae eller HD 79351, är en trippelstjärna i norra delen av stjärnbilden Kölen. Den har en genomsnittlig skenbar magnitud av ca 3,43[3] och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 7,3 mas,[2] beräknas den befinna sig på ett avstånd på ca 450 ljusår (ca 137 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 23 km/s.[5]

Egenskaper

Primärstjärnan V357 Carinae Aa är en vit till blå underjättestjärna av spektralklass B2 IV-V.[3] Den har en massa som är ca 9,2[6] solmassor, en radie som är ca 5[7] solradier och har ca 2 500[4] gånger solens utstrålning av energi från dess fotosfär vid en effektiv temperatur av ca 21 700 K.[7]

V357 Carinae är en astrometrisk dubbelstjärna, vilket betyder att dess rörelse på himlen sker i ett omlopp kring en osynlig följeslagare. Den är också en enkelsidig spektroskopisk dubbelstjärna och möjligen ett trippelsystem.[10] De två närmaste komponenterna kretsar runt varandra på 6,74 dygn,[11] medan den observerade astrometriska rörelsen är mycket längre.[6]

Ljuskurva för V357 Carinae, plottad från TESS-data.[12]

Variation

V345 Carinae är en trolig variabel stjärna med ljusstyrka som varierar från magnituden +3,41 till +3,44 med en period på 6,74 dygn. Den klassificerades som en förmörkande dubbelstjärna i Gaposchkins ursprungliga katalog över variabla stjärnor,[13] även om variationen ofta ansågs tveksam.[3] Den tros nu med största sannolikhet vara en mycket ytlig förmörkande dubbelstjärna.[2]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, V357 Carinae, 4 mars 2023.

Noter

  1. ^ [a b c d e] 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. S2CID 18759600.
  2. ^ [a b c] Avvakumova, E. A.; Malkov, O. Yu.; Kniazev, A. Yu. (2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
  3. ^ [a b c d e] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. ^ [a b c d] https://www.universeguide.com/star/45080/v357carinae. Hämtad 2023-04-13.
  5. ^ [a b] Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  6. ^ [a b c] Tokovinin, A.A. "Multiple Star Catalog". Retrieved 2019-09-01.[permanent dead link]
  7. ^ [a b c d] Underhill, A. B.; et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the Royal Astronomical Society. 189 (3): 601–605. Bibcode:1979MNRAS.189..601U. doi:10.1093/mnras/189.3.601.
  8. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 KPC from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  9. ^ V357 Car (unistra.fr). Hämtad 2023-04-13.
  10. ^ 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.
  11. ^ Buscombe, W.; Morris, P. M. (1960). "The Scorpio-Centaurus Association: I. Radial Velocities of 120 Bright Stars". Monthly Notices of the Royal Astronomical Society. 121 (3): 263–278. Bibcode:1960MNRAS.121..263B. doi:10.1093/mnras/121.3.263.
  12. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Hämtad 8 december 2021.
  13. ^ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars. 1248: 1. Bibcode:1977IBVS.1248....1K.

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