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GCIRS 7

GCIRS 7
Observationsdata
Epok: J2000.0
StjärnbildSkytten
Rektascension17t 45m 49,987s[1]
Deklination-29° 00′ 22,24″[1]
Skenbar magnitud ()14,197 ± 0,137[1] (J)
Stjärntyp
SpektraltypM1 I[2]
Astrometri
Radialhastighet ()-126,5 ± 1,5[3] km/s
Egenrörelse (µ)RA: +359,9456[3] mas/år
Dek.: -0,0452[3] mas/år
Detaljer
Massa20 - 25[4] M
Radie1 170 ± 60[4] R
Luminositet189 000 +42 000−35 000[2] L
Temperatur3 600 ± 195,[2] 3 400[5] K
Metallicitet-0,02[6]
Ålder6,5 - 10[2] miljoner år
Andra beteckningar
GCIRS 7, 2MASS J17454004-2900225, AP J17454004-2900225[3][1]

GCIRS 7 är en röd superjätte i stjärnbilden Skytten och belägen i Vintergatans centrum. Den är mycket ljusstark och är en av de största stjärnorna som för närvarande (2023) har upptäckts, med en storlek på cirka 960 solradier.[2] Om den placeras i solsystemet, skulle dess fotosfär nästan uppsluka Jupiters omloppsbana.[2]

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, GCIRS 7, 9 maj 2024..
  1. ^ [a b c d] "SIMBAD query result: GCIRS 7 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Hämtad 5 juni 2020.
  2. ^ [a b c d e f] Paumard, T; Pfuhl, O; Martins, F; Kervella, P; Ott, T; Pott, J-U; Le Bouquin, JB; Breitfelder, J; Gillessen, S; Perrin, G; Burtscher, L; Haubois, X; Brandner, W (2014). "GCIRS 7, a pulsating M1 supergiant at the Galactic centre . Physical properties and age". Astronomy & Astrophysics. 568 (85): A85. arXiv:1406.5320. Bibcode:2014A&A...568A..85P. doi:10.1051/0004-6361/201423991. S2CID 119233940.
  3. ^ [a b c d] https://simbad.cds.unistra.fr/simbad/sim-id?Ident=GCIRS+7. Hämtad 2024-05-27.
  4. ^ [a b] Tsuboi, Masato; Kitamura, Yoshimi; Tsutsumi, Takahiro; Miyawaki, Ryosuke; Miyoshi, Makoto; Miyazaki, Atsushi (2020-04-01). "Sub-millimeter detection of a Galactic center cool star IRS 7 by ALMA". Publications of the Astronomical Society of Japan. 72 (2): 36. arXiv:2002.01620. Bibcode:2020PASJ...72...36T. doi:10.1093/pasj/psaa013. ISSN 0004-6264. S2CID 211032112.
  5. ^ Pott, J.-U.; Eckart, A.; Glindemann, A.; Kraus, S.; Schöde, R.; Ghez, A. M.; Woillez, J.; Weigelt, G. (2008). "First VLTI infrared spectro-interferometry on GCIRS 7". Astronomy & Astrophysics. 487 (1): 413–418. arXiv:0805.4408. Bibcode:2008A&A...487..413P. doi:10.1051/0004-6361:200809829. S2CID 14697759.
  6. ^ Carr, John S.; Sellgren, K.; Balachandran, Suchitra C. (2000). "The First Stellar Abundance Measurements in the Galactic Center: The M Supergiant IRS 7". The Astrophysical Journal. 530 (1): 307. arXiv:astro-ph/9909037. Bibcode:2000ApJ...530..307C. doi:10.1086/308340. S2CID 12036617.

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GCIRS 7
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