| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius[1] |
| Right ascension | 17h 45m 39.987s[2] |
| Declination | −29° 00′ 22.24″[2] |
| Characteristics | |
| Evolutionary stage | RSG[3] |
| Spectral type | M1I[4] |
| Apparent magnitude (J) | 14.197±0.137[5] |
| Apparent magnitude (H) | 9.260±0.118[5] |
| Apparent magnitude (K) | 6.503±0.017[5] |
| Details | |
| Mass | 20 – 25[6] M☉ |
| Radius | 1,170±60[6] R☉ |
| Luminosity | 189,000+42,000 −35,000[4] L☉ |
| Surface gravity (log g) | −0.6[7] cgs |
| Temperature | 3,600±195[4] or 3,400[8] K |
| Metallicity [Fe/H] | −0.02[7] dex |
| Age | 6.5 – 10[4] Myr |
| Other designations | |
| GCIRS 7, Galactic Center IRS 7, Sgr A IRS 7, TIC 321993603, AP J17454004-2900225, 2MASS J17454004-2900225[9] | |
| Database references | |
| SIMBAD | data |
GCIRS 7 is a pulsating red supergiant star located in the Galactic Center of the Milky Way galaxy. It is very luminous with a luminosity of 189,000 Sun’s (L☉). It is also one of the largest stars currently discovered in the galactic center with a size about 1,170 solar radii (R☉).[6] If it was placed in the Solar System, its photosphere would engulf the orbit of Jupiter. The outer layers of the atmosphere are being blown away from stellar winds of the central cluster, with a very high mass loss rate of 1×10−4 times the Sun's mass per year (M☉), both one of the highest for any star and almost comparable to OH/IR red hypergiants VY Canis Majoris and NML Cygni. This forms a cometary tail north of the star.[10] It formed some 6.5 to 10 million years ago together with many of the massive stars in the galactic center.[3]
See also
- KW Sagittarii, another red supergiant in Sagittarius
- VX Sagittarii, another heavily mass-losing pulsating red supergiant (or possible super-AGB star) in Sagittarius
References
- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b Yusef-Zadeh, F.; Morris, M.; Ekers, R. (1989). "Multi-Array λ2 and 6CM Radio Continuum Observations of SGR a West". The Center of the Galaxy. 136: 443. Bibcode:1989IAUS..136..443Y. doi:10.1007/978-94-009-2362-1_60. ISBN 978-0-7923-0222-3.
- ^ a b Rodríguez-Coira, G.; Paumard, T.; Perrin, G.; Vincent, F.; Abuter, R.; Amorim, A.; Bauböck, M.; Berger, J. P.; Bonnet, H.; Brandner, W.; Clénet, Y.; de Zeeuw, P. T.; Dexter, J.; Drescher, A.; Eckart, A. (July 2021). "MOLsphere and pulsations of the Galactic Center's red supergiant GCIRS 7 from VLTI/GRAVITY". Astronomy & Astrophysics. 651: A37. arXiv:2105.09832. Bibcode:2021A&A...651A..37G. doi:10.1051/0004-6361/202039501. ISSN 0004-6361.
- ^ 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.
- ^ a b c Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode:2003yCat.2246....0C.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "GCIRS 7". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-08-24.
- ^ Paumard, T.; Pfuhl, O.; Martins, F.; Kervella, P.; Ott, T.; Pott, J.-U.; Le Bouquin, J. B.; Breitfelder, J.; Gillessen, S.; Perrin, G.; Burtscher, L.; Haubois, X.; Brandner, W. (2014). "GCIRS 7, a pulsating M1 supergiant at the Galactic centre". Astronomy & Astrophysics. 568: A85. arXiv:1406.5320. Bibcode:2014A&A...568A..85P. doi:10.1051/0004-6361/201423991.
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