Trumpler 27
It was originally thought to be young open cluster in the outer edge of the Sagittarius Arm, still surrounded by interstellar matter. The light from the stars is heavily extinguished and reddened by intervening interstellar dust. The light coming from the stars is also significantly polarized. However, a close study in 2012 could not confirm whether the stars truly form a cluster, or if they are a close alignment of bright stars.
Several member stars have been studied in closer detail. Star #1 of Trumpler 27 is CD−33°12241, a red supergiant star with a spectral type of M0Ia. Stars #28 and #105 are Wolf-Rayet stars. Star #27, a blue giant star with a spectral type of O8III((f)), may be one of the most luminous stars known, with a bolometric magnitude of −10.5. Star #102 is known as V925 Scorpii or HD 159378, and is a rare yellow supergiant star.
Star name | Temperature (K) |
Absolute magnitude |
Bolometric magnitude |
Mass (M☉) |
Spectral type |
---|---|---|---|---|---|
Trumpler 27-1 | 3,790 | -8.57 | -8.78 | 5.86 | M0Ia |
Trumpler 27-28 (WR 95) | 44,000 | -5.25 | -8.3 | 10.7 | WC9d |
Trumpler 27-105 (WR 98) | 40,000 | -6.62 | -10.1 | WN8/WC7 | |
Trumpler 27-102 | 5,980 | -6.8 | -7 | G0Ia | |
Trumpler 27-27 | 37,200 | -6.9 | -10.5 | 81 | O8III((f)) |
Trumpler 27-23 | 27,500 | -7.5 | -10.2 | 64 | B0.5I |
Trumpler 27-2 | 28,800 | -6.5 | -9.4 | 42 | B0Ia |
Trumpler 27-46 | 11,200 | -8.7 | -9.3 | 35 | B8I |
Trumpler 27-104 | 35,700 | -5.1 | -8.6 | 32 | O8.5III |
Trumpler 27-43 | 11,200 | -8.2 | -8.9 | 29 | B8I |
Trumpler 27-14 | 28,800 | -5.7 | -8.5 | 27 | B0Ib |
Trumpler 27-16 | 27,500 | -5.7 | -8.5 | 26 | B0.5Ia |
Trumpler 27-1a | 36,600 | -3.8 | -7.4 | 23 | |
Trumpler 27-103 | 26,300 | -5.4 | -7.9 | 21 | B1I |
See also
References
- ^ "Cl Trumpler 27". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-31.
- ^ Perren, G.; Vázquez, R. A.; Carraro, G. (2012). "Photometric distances to young stars in the inner Galactic disk. II. The region towards the open cluster Trumpler 27 at L = 355°". Astronomy and Astrophysics. 548: A125. arXiv:1209.3273. Bibcode:2012A&A...548A.125P. doi:10.1051/0004-6361/201219653. S2CID 62888409.
- ^ Morales, Esteban F. E.; Wyrowski, Friedrich; Schuller, Frederic; Menten, Karl M. (2013). "Stellar clusters in the inner Galaxy and their correlation with cold dust emission". Astronomy and Astrophysics. 560: A76. arXiv:1310.2612. Bibcode:2013A&A...560A..76M. doi:10.1051/0004-6361/201321626. S2CID 118422539.
- ^ Moffat, A. F. J.; Fitzgerald, M. P.; Jackson, P. D. (1977). "Trumpler 27: A heavily reddened young open cluster with blue and red supergiants". The Astrophysical Journal. 215: 106. Bibcode:1977ApJ...215..106M. doi:10.1086/155338.
- ^ The, P. S.; Stokes, N. (1970). "A study of the southern open clusters : TR 27, TR 28, NGC 6416, NGC 6425". Astronomy and Astrophysics. 5: 298. Bibcode:1970A&A.....5..298T.
- ^ Feinstein, Carlos; Baume, Gustavo; Vazquez, Ruben; Niemela, Virpi; Cerruti, Miguel Angel (2000). "The Highly Polarized Open Cluster Trumpler 27". The Astronomical Journal. 120 (4): 1906. arXiv:astro-ph/0007093. Bibcode:2000AJ....120.1906F. doi:10.1086/301562. S2CID 18701893.
- ^ Massey, P.; Degioia-Eastwood, K.; Waterhouse, E. (2001). "The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turnoffs. II. Results from 12 Galactic Clusters and OB Associations". The Astronomical Journal. 121 (2): 1050–1070. arXiv:astro-ph/0010654. Bibcode:2001AJ....121.1050M. doi:10.1086/318769. S2CID 53345173.
- ^ "HD 159378". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-31.
- ^ Bakker, R.; The, P. S. (1983). "An investigation of the heavily reddened young open cluster TR 27 on the Walraven photometric system". Astronomy and Astrophysics Supplement Series. 52: 27. Bibcode:1983A&AS...52...27B.