LSS 4067
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 17h 19m 05.548s[1] |
Declination | −29° 43′ 41.1989″[1] |
Apparent magnitude (V) | 11.176[2] |
Characteristics | |
Spectral type | O4.5Ifpe[3] |
U−B color index | +0.353[2] |
B−V color index | +1.505[2] |
Astrometry | |
Radial velocity (Rv) | -51.0[4] km/s |
Proper motion (μ) | RA: -2.5[5] mas/yr Dec.: -6.6[5] mas/yr |
Distance | 9,500–12,700 ly (2,900–3,900[6] pc) |
Absolute magnitude (MV) | -7.0[7] |
Absolute bolometric magnitude (Mbol) | -11.4[7] |
Details | |
Mass | 120[7] M☉ |
Surface gravity (log g) | 3.92[4] cgs |
Temperature | 32800[4] K |
Rotational velocity (v sin i) | <107[4] km/s |
Age | 1.10[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
LSS 4067, also known as CD−38° 11748, is an O-type blue supergiant star located in the constellation Scorpius, very close to the galactic plane. It is part of the open cluster HM 1,[8] although its distance is not well known; it may be anywhere between 9,500 and 12,700 light years (2900 to 3900 parsecs) away from the Earth. Despite being a blue supergiant, it is extremely reddened by interstellar extinction, so its apparent magnitude is brighter for longer-wavelength passbands.[2]
LSS 4067 has an absolute bolometric magnitude of −11.4,[7] making it one of the most luminous stars known. Indeed, many of the hottest and most luminous stars known are O-type supergiants, or Wolf-Rayet stars. LSS 4067 has an unusual spectrum, with various emission lines including N III and He II emission lines, thus the "f" in its spectral type.[4] Because of this unusual spectrum, classifying the star or deducing its properties has proved relatively difficult: for example, the effective temperature is predicted to be too cool and the surface gravity too high.[4]
See also
References
- ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- ^ a b c d Kozok, J. R. (1985). "Photometric observations of emission B-stars in the southern Milky Way". Astronomy and Astrophysics Supplement Series. 61: 387–405. Bibcode:1985A&AS...61..387K.
- ^ Sota, A.; et al. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement. 211 (1). arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10.
- ^ a b c d e f Williams, S. J.; et al. (2011). "Radial Velocities of Galactic O-type Stars. I. Short-term Constant Velocity Stars". The Astronomical Journal. 142 (5). Bibcode:2011AJ....142..146W. doi:10.1088/0004-6256/142/5/146.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ Vázquez, R. A.; Baume, G. (2001). "The open cluster Havlen-Moffat No. 1 revisited". Astronomy and Astrophysics. 371: 908–920. Bibcode:2001A&A...371..908V. doi:10.1051/0004-6361:20010410.
- ^ a b c d e 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.
- ^ "CD-38 11748". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 January 2016.