Astronomy:GCIRS 7
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Short description: Star in the constellation Sagittarius
| Observation data 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 |
| J−K color index | 7.694 |
| Details | |
| Mass | 20−25[3] M☉ |
| Radius | 1,170±60[3] R☉ |
| Luminosity | 189,000+42,000 −35,000[2] L☉ |
| Surface gravity (log g) | −0.6[4] cgs |
| Temperature | 3,600±195,[2] 3,400[5] K |
| Metallicity [Fe/H] | −0.02[4] dex |
| Age | 6.5 - 10[2] Myr |
| Other designations | |
| 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 960 solar radii.[2] If placed in the Solar System, its photosphere would nearly engulf the orbit of Jupiter.[2]
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "SIMBAD query result: GCIRS 7 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GCIRS+7.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Paumard, T; Pfuhl, O; Martins, F; Kervella, P; Ott, T; Pott, J-U; Le Bouquin, JB; Breitfelder, J et al. (2014). "GCIRS 7, a pulsating M1 supergiant at the Galactic centre . Physical properties and age". Astronomy & Astrophysics 568 (85): A85. doi:10.1051/0004-6361/201423991. Bibcode: 2014A&A...568A..85P.
- ↑ 3.0 3.1 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. doi:10.1093/pasj/psaa013. ISSN 0004-6264. Bibcode: 2020PASJ...72...36T.
- ↑ 4.0 4.1 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. doi:10.1086/308340. Bibcode: 2000ApJ...530..307C.
- ↑ 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: 413–418. doi:10.1051/0004-6361:200809829. Bibcode: 2008A&A...487..413P.
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