Trumpler 27-1

Red supergiant star in the constellation Scorpius

Trumpler 27-1
Observation data Epoch J2000 Equinox J2000
The Trumpler 27 open cluster. Trumpler 27-1 is the brightest and reddest star in the image.
Constellation	Scorpius
Right ascension	17^h 36^m 10.1189^s^[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 (R_v)	−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]
Distance	approx. 8,000 ly (approx. 2,500 pc)

Details

Radius	1,073^[3] `R`_☉
Luminosity	215,000 – 261,000^[3] `L`_☉
Surface gravity (log g)	-0.24^[4] cgs
Temperature	3,222^[4] – 3,790^[3] K
Metallicity [Fe/H]	+0.15^[4] dex

Other designations
CD−33 12241, CPD−33 4468, TYC 7380-627-1^[2]
Database references
SIMBAD	data

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.

Observation history

Trumpler 27-1 was discovered and catalogued when the open cluster (not confirmed then) was first identified in the late 20th century.^{[citation needed]} 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,^[3] 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.^{[citation needed]}

Location

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

References

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c "CD-33 12241". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 July 2020.
^ ^a ^b ^c ^d 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.
^ ^a ^b ^c 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.
^ ^a ^b 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.

Constellation of Scorpius

Stars

Bayer	α (Antares) β (Acrab) δ (Dschubba) ε (Larawag) ζ¹ ζ² η θ (Sargas) ι¹ ι² κ (Girtab) λ (Shaula) μ¹ (Xamidimura) μ² (Pipirima) ν (Jabbah) ξ ο π (Fang) ρ (Iklil) σ (Alniyat) τ (Paikauhale) υ (Lesath) χ ψ ω¹ ω² G (Fuyue) H (β Nor) N (α Nor) Q
Flamsteed	1 (b) 2 (A) 3 4 11 12 (c¹) 13 (c²) 16 18 22 (i) 25 27
Variable	T U RR RS RV RY RZ AH AI AK AR BM CL FQ HK KQ V393 V453 V455 V482 V500 V636 V701 V703 V718 V728 V745 V760 V856 V861 V866 V884 V893 V900 V905 V906 V907 V911 V913 V915 V918 V919 V921 V922 V923 V929 V933 V949 V951 V952 V957 V965 V970 V973 V975 V992 V1003 V1007 V1018 V1026 V1033 V1034 V1036 V1040 V1051 V1058 V1068 V1073 (k) V1074 V1075 V1077 V1094 V1104 V1186 V1187 V1280 V1292 V1294 V1309
HR	5906 5910 5934 5965 5969 5973 5996 5998 5999 6000 6001 6003 6006 6007 6012 6015 6017 6044 6051 6053 6054 6061 6070 (d) 6076 6077 6078 6080 6094 6097 6100 6106 6122 6145 6160 6178 6192 6206 6209 6210 6211 6214 6218 6221 6244 6260 6266 6272 6273 6282 6298 6311 6316 6331 6338 6344 6366 6371 6381 6382 6389 6398 6403 6405 6409 6420 6454 6456 6460 6470 6501 6503 6517 6523 6539 6557 6558 6583 6587 6597 6613 6628 6643 6648 6649 6651 6653 6657 6658 6668 6671 6675 6678 6682 6683
HD	143567 144432 145377 146436 150248 150420 152424 153234 153950 (Rapeto) 155448 155985 158042 159868 162020
Other	Gliese 618 Gliese 667 Gliese 682 CD -35 11760 CD -38 10980 EPIC 204278916 EPIC 204376071 GCRT J1745−3009 GSC 06214-00210 GX 340+0 GX 349+2 H1-36 H1743-322 HIP 79431 (Sharjah) IGR J17091-3624 IGR J17252−3616 IRAS 17163−3907 K2-24 K2-33 LSS 4067 MOA-2008-BLG-310L MXB 1735-44 OAO 1657-415 OGLE-2005-BLG-071L OGLE-2005-BLG-390L OGLE-2006-BLG-109L Oph 162225-240515 Pismis 24-1 PSR B1620−26 PSR B1706−44 PSR B1737−30 PSR J1614−2230 Rapid Burster ROXs 12 1RXS J160929.1−210524 1RXS J170849.0−400910 Scorpius X-1 Th 28 Trumpler 27-1 Trumpler 27-27 Trumpler 27-28 Trumpler 27-102 Trumpler 27-105 4U 1700-37 4U 1702-42 4U 1705-44 4U 1724-307 4U 1728-34 4U 1746-371 UScoCTIO 108 VVV-WIT-07 WASP-17 (Dìwö) WR 86 WR 93b Wray 17-96 XTE J1720−318 XTE J1739−302 XTE J1751−305

Exoplanets	HD 145377 b HD 153950 b HD 159868 b HIP 78530 b HIP 79431 b K2-24b c K2-33b OGLE-2005-BLG-071Lb OGLE-2005-BLG-390Lb OGLE-2007-BLG-368Lb PSR B1620−26 b (Methuselah) WASP-17b V921 Scorpii b