Trumpler 27-1

Trumpler 27-1 is a red supergiant star that is a member of the massive, possible open cluster Trumpler-27, where a blue giant star, a yellow supergiant star , and two Wolf–Rayet stars are also located.

Trumpler 27-1

The Trumpler 27 open cluster. Trumpler 27-1 is the brightest and reddest star in the image.
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 36m 10.1189s[1]
Declination −33° 29′ 40.620″[1]
Apparent magnitude (V) 8.79[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M0Ia[2]
Astrometry
Radial velocity (Rv)−16.84 ± 0.82[1] km/s
Proper motion (μ) RA: 0.223[1] mas/yr
Dec.: −1.179[1] mas/yr
Parallax (π)0.4020 ± 0.0770 mas[1]
Distanceapprox. 8,000 ly
(approx. 2,500 pc)
Details
Mass5.86[3] M☉
Radius1,073[4] R☉
Luminosity215,000 – 261,000[4] L☉
Surface gravity (log g)-0.24[3] cgs
Temperature3,222[3] – 3,790[4] K
Metallicity [Fe/H]+0.15[3] dex
Other designations
CD−33 12241, CPD−33 4468, TYC 7380-627-1[2]
Database references
SIMBADdata

Observation history

Trumpler 27-1 was discovered and catalogued when the open cluster (not confirmed then) was first identified in the late 20th century. It has since remained largely unobserved, being featured in the Gaia Catalogue and other pieces of literature.[5]

Physical properties

Trumpler 27-1 is among the largest stars known, with a radius of over 1,000 solar radii, one estimate giving 1,073 R☉ and another giving a size of over 1,300 solar radii.[5] This star's spectral type is M0Ia,[4] meaning it possesses a cool temperature of below 3,800 K. So far, Trumpler 27-1 is the only identified red supergiant in the open cluster Trumpler 27.

Location

Trumpler 27–1, and the open cluster in which it is located, is in the constellation of Scorpius.

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. "CD-33 12241". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 July 2020.
  3. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID 131780028.
  4. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
  5. Stassun, Keivan G.; et al. (1 October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
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