1 Delphini

1 Delphini
Observationsdata
Epok: J2000.0
StjärnbildDelfinen
Rektascension20t 30m 17,96064s[1]
Deklination+10° 53′ 45,3233″[1]
Skenbar magnitud ()6,08,[2] 5,92 – 6,07 (V)[3]
Stjärntyp
SpektraltypA1 III[4]
B–V-0,019 ± 0,007[5]
VariabeltypMisstänkt variabel[3]
Astrometri
Radialhastighet ()-15,5 ± 2[6] km/s
Egenrörelse (µ)RA: +16,12 ± 0,64[1] mas/år
Dek.: +3,10 ± 0,72[1] mas/år
Parallax ()4,39 ± 0,69[1]
Avståndca 700 ± 4  (ca 230 ± 1 pc)
Absolut magnitud ()-0,76[7]
Detaljer
Radie3,97[7] R
Luminositet197,74[7] L
Temperatur10 551[7] K
Vinkelhastighet200[4] km/s
Andra beteckningar
CCDM J20303+1054AB, MWC 1019, JP11 3244, UBV 17783, GC 28525, 2MASS J20301796+1053454, UBV M 24894, BU 63AB, GCRV 12809, NSV 13114, uvby98 100195325, ADS 13920 AB, GEN# +1.00195325J, PLX 4876, WDS J20303+1054AB, AG+10 2700, GSC 01091-01875, PLX 4876.00, WEB 18274, BD+10 4303, HD 195325, PPM 138473, YZ 10 7952, CEL 5083, HIC 101160, ROT 2986, AAVSO 2025+10, CSI+10 4303 4, HIP 101160, SAO 106172, CSI+10 4303 3, HR 7836, SKY# 38798, CSI+10 4303 1, IDS 20255+1034 AB, TD1 26815[8]

1 Delphini, som är stjärnans Flamsteed-beteckning, är en trippelstjärna belägen i den mellersta delen av stjärnbilden Delfinen. Den har en lägsta skenbar magnitud på ca 6,08[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 4,4[1] mas, beräknas den befinna sig på ett avstånd av ca 700 ljusår (ca 230 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -16 km/s.[6]

Egenskaper

Primärstjärnan 1 Delphini A är en vit till blå jättestjärna av spektralklass A1 III[4] och är en skalstjärna med stabila emissionslinjer i dess spektrum. På grund av emissionslinjernas stabilitet har data från 1 Delphini använts för att utveckla modeller av skalstjärnor och Be-stjärnor.[9] Den har en radie som är ca 4[7] solradier och utsänder ca 198[7] gånger mera energi än solen från dess fotosfär vid en effektiv temperatur av ca 10 600 K.[7]

1 Delphini är en misstänkt variabel stjärna, som varierar mellan visuell magnitud +5,92 och 6,07 utan någon fastställd periodicitet.[3] Den består av tre komponenter, primärstjärnan 1 Delphini A, och följeslagarna 1 Delphini B, som ligger ca 0,9 bågsekunder från primärstjärnan med en skenbar magnitud på 8,1 och 1 Delphini C som ligger mycket längre bort på ca 17 bågsekunder från primärstjärnan och är den svagaste med en magnitud på cirka 14.

Se även

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 1 Delphini, 24 februari 2021.

Noter

  1. ^ [a b c d e f] Van Leeuwen, Floor (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ [a b] Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ [a b c] ”NSV 13114” (på engelska). The International Variable Star Index. AAVSO – American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=51738. Läst 3 juli 2019. 
  4. ^ [a b c] Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  5. ^ van Leeuwen (2007). ”Hipparcos, the New Reduction” (på engelska). http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&HIP=101160. Läst 3 juli 2019. 
  6. ^ [a b] Ralph Elmer Wilson (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  7. ^ [a b c d e f g] https://www.universeguide.com/star/ 101160/1delphini. Hämtad 2021-02-24.
  8. ^ ”Basic data: V* 1 Del – Double or multiple star” (på engelska). Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+Del&submit=SIMBAD+search. Läst 3 juli 2019. 
  9. ^ Kubát, Jiří; Kubátová, Brankica; Doležalová, Barbora; Iliev, Lubomir; Šlechta, Miroslav (1 March 2016). "Spectroscopy of close visual binary components of the stable shell star 1 Delphini". Astronomy & Astrophysics. 587: A22. arXiv:1601.05236. Bibcode:2016A&A...587A..22K. doi:10.1051/0004-6361/201526414.

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