| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17 45 39.987 |
| Declination | −29° 00′ 22.24″ |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | M1I |
| Apparent magnitude (J) | 14.197±0.137 |
| Apparent magnitude (H) | 9.260±0.118 |
| Apparent magnitude (K) | 6.503±0.017 |
| J−H color index | 4.937 |
| J−K color index | 7.694 |
| Details | |
| Mass | 20 – 25 M☉ |
| Radius | 1,170±60 R☉ |
| Luminosity | 189,000+42,000 −35,000 L☉ |
| Surface gravity (log g) | −0.6 cgs |
| Temperature | 3,600±195, 3,400 K |
| Metallicity | −0.02 dex |
| Age | 6.5 – 10 Myr |
| Other designations | |
| GCIRS 7, 2MASS J17454004-2900225 | |
| Database references | |
| SIMBAD | data |
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. If placed in the Solar System, its photosphere would engulf the orbit of Jupiter.
See also
- KW Sagittarii, another red supergiant in Sagittarius
- VX Sagittarii, another red supergiant (or possible super-AGB star) in Sagittarius
References
- ^ "SIMBAD query result: GCIRS 7 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 5 June 2020.
- ^ 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.
- ^ 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.
- ^ 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.
- 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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