GCIRS 7

GCIRS 7
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 17h 45m 39.987s[1]
Declination −29° 00′ 22.24″[1]
Characteristics
Evolutionary stage Red supergiant
Spectral type M1I[2]
Apparent magnitude (J) 14.197±0.137[1]
Apparent magnitude (H) 9.260±0.118[1]
Apparent magnitude (K) 6.503±0.017[1]
J−H color index 4.937[citation needed]
J−K color index 7.694[citation needed]
Details
Mass20 – 25[3] M☉
Radius1,170±60[3] R☉
Luminosity189,000+42,000
−35,000[2] L☉
Surface gravity (log g)−0.6[4] cgs
Temperature3,600±195,[2] 3,400[5] K
Metallicity [Fe/H]−0.02[4] dex
Age6.5 – 10[2] Myr
Other designations
GCIRS 7, 2MASS J17454004-2900225[1]
Database references
SIMBADdata

GCIRS 7 is a red supergiant located in the Galactic Center. It is very bright and is one of the largest stars currently discovered, with a size about 1,170 solar radii.[3] If placed in the Solar System, its photosphere would engulf the orbit of Jupiter.

See also

References

  1. ^ a b c d e f "SIMBAD query result: GCIRS 7 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 5 June 2020.
  2. ^ a b c d 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 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.
  4. ^ a b 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.
  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.


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