LSS 4067

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
Distance9,500–12,700 ly
(2,900–3,900[6] pc)
Absolute magnitude (MV)-7.0[7]
Absolute bolometric
magnitude (Mbol)		-11.4[7]
Details
Mass120[7] M☉
Surface gravity (log g)3.92[4] cgs
Temperature32800[4] K
Rotational velocity (v sin i)<107[4] km/s
Age1.10[7] Myr
Other designations
LS 4067, CD−38° 11748, Hen 3-1374, HM 1 VB 4, TYC 7870-896-1, 2MASS J17190554-3848496
Database references
SIMBADdata

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

  1. 1 2 Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. 1 2 3 4 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.
  3. ↑ 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.
  4. 1 2 3 4 5 6 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.
  5. 1 2 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.
  6. ↑ 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.
  7. 1 2 3 4 5 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.
  8. ↑ "CD-38 11748". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 January 2016.
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