HD 53143

HD 53143
Observationsdata
Epok: J2000.0
StjärnbildKölen[1]
Rektascension06t 59m 59,65545s[2]
Deklination-61° 20′ 10,2546″[2]
Skenbar magnitud ()+6,80 (V)[3]
Stjärntyp
SpektraltypG9 V[4]
U–B+0,43[4]
B–V+0,80[4]
Astrometri
Radialhastighet ()+21,3[5] km/s
Egenrörelse (µ)RA: -161,59[2] mas/år
Dek.: +264,67[2] mas/år
Parallax ()54,57 ± 0,34[2]
Avstånd59,8 ± 0,4  (18,3 ± 0,1 pc)
Absolut magnitud ()6,30[6]
Detaljer
Radie0,85 ± 0,02[7] R
Luminositet0,7[6] L
Temperatur5 224[6] K
Metallicitet0,22 (Fe/H) [8] dex
Vinkelhastighet4,0 ± 1,0[7] km/s
Ålder1,01 ± 0,13[9] miljarder år
Andra beteckningar
CD-61 1535, CPD-61 754, GJ 260, HD 53143, HIC 33690, HIP 33690, IRAS 06594-6115, IRAS F06594-6115, 2MASS J06595966-6120106, NLTT 17321, PPM 355754, 1RXS J070000.6-612008, SAO 249700, TYC 8908-1355-1, uvby98 100053143, WISEA J065959.41-612007.5, WISE J065959.41-612007.5, Gaia DR2 5479222240596469632, Gaia DR1 5479222236299064832 [10][11]

HD 53143 är en ensam stjärna belägen i den mellersta delen av stjärnbilden Kölen. Den har en skenbar magnitud av ca 6,80[2] och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 54,6[2] mas, beräknas den befinna sig på ett avstånd på ca 55 ljusår (ca 18 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 21 km/s[2] och beräknas komma så nära solen som 189,5 ljusår om 1,345 miljoner år.[2]

Egenskaper

HD 53143 är en gul till orange stjärna i huvudserien av spektralklass G9 V[4] eller K1 V.[6] Den har en radie som är ca 0,85[7] solradier och har ca 0,7 gånger solens utstrålning av energi[6] från dess fotosfär vid en effektiv temperatur av ca 5 200 K.[6]

Stoftskiva

Stoftskiva kring HD 53143 fotograferad av Hubble Space Telescope. Stjärnan själv är dold av kamerans koronograf för att synliggöra skivan.

Baserat på ett överskott av infraröd strålning har en omgivande stoftskiva observerats kring stjärnan.[12] Skivan lutar i en vinkel på ca 40–50° mot siktlinjen från jorden och har en uppskattad massa på mer än 7 × 1020 kg. (Som jämförelse är månens massa 7,377 × 1022 kg.) Detta är en av de äldsta kända stjärnorna med stoftskiva och kan följaktligen fyllas på genom kollision med större objekt. Den observerade innerkanten på skivan ligger på ett avstånd av 55 astronomiska enheter (AE) från stjärnan, medan den sträcker sig till två gånger det avståndet, eller 110 AE. Den kan även sträcka sig utanför detta intervall, eftersom mätningarna begränsas av instrumentens känslighet. Materialet i skivan förefaller jämnt fördelat utan några tecken på klumpning.[6]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 231701, 24 augusti 2020.

Noter

  1. ^ Constellation boundaries, Centre de Données astronomiques de Strasbourg, hämtad 2007-07-24
  2. ^ [a b c d e f g h i] van Leeuwen, F. (November 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
  3. ^ 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
  4. ^ [a b c d] Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics, 460 (3): 695–708, arXiv:astro-ph/0609258, Bibcode:2006A&A...460..695T, doi:10.1051/0004-6361:20065602
  5. ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Alan Henry, Batten; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
  6. ^ [a b c d e f g] Kalas, Paul; et al. (January 2006), "First Scattered Light Images of Debris Disks around HD 53143 and HD 139664", The Astrophysical Journal, 637 (1): L57–L60, arXiv:astro-ph/0601488, Bibcode:2006ApJ...637L..57K, doi:10.1086/500305
  7. ^ [a b c] Watson, C. A.; et al. (May 2011), "On the alignment of debris discs and their host stars' rotation axis - implications for spin-orbit misalignment in exoplanetary systems", Monthly Notices of the Royal Astronomical Society: Letters, 413 (1): L71–L75, arXiv:1009.4132, Bibcode:2011MNRAS.413L..71W, doi:10.1111/j.1745-3933.2011.01036.x
  8. ^ Árnadóttir, A. S.; Feltzing, S.; Lundström, I. (October 2010), "The ability of intermediate-band Strömgren photometry to correctly identify dwarf, subgiant, and giant stars and provide stellar metallicities and surface gravities", Astronomy and Astrophysics, 521: A40, arXiv:1008.3848, Bibcode:2010A&A...521A..40A, doi:10.1051/0004-6361/200913544
  9. ^ Barnes, Sydney A. (November 2007), "Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors", The Astrophysical Journal, 669 (2): 1167–1189, arXiv:0704.3068, Bibcode:2007ApJ...669.1167B, doi:10.1086/519295
  10. ^ http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+53143. Hämtad 2020-08-25.
  11. ^ "NLTT 17321 -- High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, hämtad 2007-07-24
  12. ^ Two new dusty planetary disks may be astrophysical mirrors of our Kuiper Belt, UC Berkeley News, January 19, 2006, hämtad 2007-07-24

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