HD 150136

Last updated
HD 150136
Ara constellation map.svg
Red circle.svg
Location of HD 150136 (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ara [1]
Right ascension 16h 41m 20.41559s [2]
Declination −48° 45′ 46.7305″ [2]
Apparent magnitude  (V)5.54 [3]
Characteristics
Spectral type O3 V((f*)) - O3.5 V((f+)) +O5.5-6 V((f)) +O6.5-7 V((f)) [4]
U−B color index −0.76 [3]
B−V color index +0.20 [3]
Astrometry
Radial velocity (Rv)−27 [5] km/s
Proper motion (μ)RA: +2.514 [2] mas/yr
Dec.: −4.309 [2] mas/yr
Parallax (π)0.6934±0.0484  mas [2]
Distance 4,310 ± 390 ly (1,320 ± 120 pc) [6]   ly
Absolute magnitude  (MV)−6.47 (−5.91 + −4.90 + −4.44) [4]
Orbit [6]
PrimaryPrimary
CompanionSecondary
Period (P)2.67454 days
Semi-major axis (a)38.2 R☉ [4]
Eccentricity (e)0
Inclination (i)53 [7] °
Semi-amplitude (K1)
(primary)		208.3 km/s
Semi-amplitude (K2)
(secondary)		334.5 km/s
Orbit [7]
PrimaryPrimary/Secondary
CompanionTertiary
Period (P)3069  d
Semi-major axis (a)16.918"
(20.9  AU [6] )
Eccentricity (e)0.6780
Inclination (i)106.11°
Semi-amplitude (K1)
(primary)		22.1 km/s
Semi-amplitude (K2)
(secondary)		70.6 km/s
Details [4]
Primary
Mass 54 [7]   M☉
Radius 12.13  R☉
Luminosity 724,000  L☉
Surface gravity (log g)4.00  cgs
Temperature 46,500  K
Rotational velocity (v sin i)171 km/s
Secondary
Mass 34 [7]   M☉
Radius 9.54  R☉
Luminosity209,000  L☉
Surface gravity (log g)4.00  cgs
Temperature 40,000  K
Rotational velocity (v sin i)136 km/s
Age 0-2  Myr
Tertiary
Mass 27.1 [7]   M☉
Radius 8.24  R☉
Luminosity 102,000  L☉
Surface gravity (log g)3.50  cgs
Temperature 36,000  K
Rotational velocity (v sin i)72 km/s
Age 1-3  Myr
Other designations
HD  150136, CD−48°11070, HIP  81702, HR  6187, SAO  227049, WDS  J16413-4846
Database references
SIMBAD data

HD 150136 is a multiple star system in the southern constellation of Ara, around 4,300 light years away. It is the brightest member of the faint open cluster NGC 6193, part of the Ara OB1 association.

Contents

System

Closeup of the NGC 6193 cluster, resolving HD 150136 and HD 150135 Caldwell 82 (50291992637).jpg
Closeup of the NGC 6193 cluster, resolving HD 150136 and HD 150135

HD 150136 is listed in the Washington Double Star Catalog as having seven visual components within 30  arcseconds . Component A is a close triple system containing three massive class O main sequence stars. The brightest companion is catalogued individually as HD 150135 as well as component C of the multiple system, separated by only 10 arcseconds. It is another O class spectroscopic binary and also a member of NGC 6193. The other catalogued components are all 10th to 12th magnitude, similar to many other stars known to be members of NGC 6193. [8]

The primary star consists of a double-lined spectroscopic binary [5] with a more distant tertiary companion. The third star is orbiting the other two with a period of 8.2 years, an eccentricity of 0.73, and an inclination of 108°. The close binary stars are separated by hardly more than their own diameters and orbit in less than 3 days, but the third is separated enough to have been resolved visually by VLTI. The measured separation in 2012 was 9 milli-arcseconds, corresponding to 11-12 AU. [6]

Properties

All three (four, including HD 150135) of the brightest stars are massive luminous O class main sequence stars, 27 to 54 times as massive as the Sun. They are around 10 times the size of the Sun, but 6-8 times hotter and each is over 100,000 times as luminous. The primary star is the closest O3 star to Earth, 46,500  K , visually 18,000 times as bright as the sun, but because of its high temperature it is around three quarters of a million times more luminous including all wavelengths. [4]

See also

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 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.
  4. 1 2 3 4 5 Mahy, L.; Gosset, E.; Sana, H.; Damerdji, Y.; De Becker, M.; Rauw, G.; Nitschelm, C. (2012). "Evidence for a physically bound third component in HD 150136". Astronomy & Astrophysics. 540: A97. arXiv: 1202.6215 . Bibcode:2012A&A...540A..97M. doi:10.1051/0004-6361/201118199. S2CID   53517114.
  5. 1 2 Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics. 424 (2): 727–732. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID   119387088.
  6. 1 2 3 4 Sana, H.; et al. (May 2013). "Three-dimensional orbits of the triple-O stellar system HD 150136". Astronomy & Astrophysics. 553: 5. arXiv: 1304.3457 . Bibcode:2013A&A...553A.131S. doi:10.1051/0004-6361/201321189. S2CID   41993530. A131.
  7. 1 2 3 4 5 Le Bouquin, J. -B; Sana, H.; Gosset, E.; De Becker, M.; Duvert, G.; Absil, O.; Anthonioz, F.; Berger, J. -P.; Ertel, S.; Grellmann, R.; Guieu, S.; Kervella, P.; Rabus, M.; Willson, M. (2017). "Resolved astrometric orbits of ten O-type binaries". Astronomy and Astrophysics. 601: A34. arXiv: 1608.03525 . Bibcode:2017A&A...601A..34L. doi:10.1051/0004-6361/201629260. S2CID   53686222.
  8. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
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