HD 150136

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HD 150136
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 16h 41m 20.42426s[1]
Declination −48° 45′ 46.7490″[1]
Apparent magnitude (V) 5.54[2]
Characteristics
Spectral type O3.5 If* + O6V + O6.5-7V[3]
U−B color index −0.76[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv) −27[4] km/s
Proper motion (μ) RA: +9.73[1] mas/yr
Dec.: −7.31[1] mas/yr
Parallax (π) −3.11 ± 2.94[1] mas
Distance 4,310 ± 390 ly (1,320 ± 120 pc)[3] ly
Orbit[4]
Period (P) 2.6761 d
Eccentricity (e) 0.04±0.06
Semi-amplitude (K1)
(primary)
111 km/s
Other designations
CD-48° 11070, HD 128333, HIP 81702, HR 6187, SAO 227049.
Database references
SIMBAD data

HD 150136 is a triple system of massive O-type stars[3] in the southern constellation of Ara. It consists of a double-lined spectroscopic binary[4] with a more distant tertiary companion. The last star is orbiting the other two with a period of 8.2 years, an eccentricity of 0.73, and an inclination of 108°. The estimated masses of the stars are 63±10, 40±6, and 33±12 times the mass of the Sun. This system contains the brightest stars in the NGC 6193 cluster.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Schild, R. E.; et al. (April 1983), "UBV photometry for southern OB stars", Astrophysical Journal Supplement Series 51: 321–336, Bibcode:1983ApJS...51..321S, doi:10.1086/190852. 
  3. ^ a b c d Sana, H.; et al. (May 2013), "Three-dimensional orbits of the triple-O stellar system HD 150136", Astronomy & Astrophysics 553: 5, Bibcode:2013A&A...553A.131S, doi:10.1051/0004-6361/201321189, A131 
  4. ^ a b c Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics 424 (2): 727, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213. 

External links[edit]