HD 150136

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title: "HD 150136" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["ara-(constellation)", "henry-draper-catalogue-objects", "triple-star-systems", "bright-star-catalogue-objects", "o-type-main-sequence-stars", "hipparcos-objects", "durchmusterung-objects", "emission-line-stars"] description: "Multiple star system in the constellation Ara" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/HD_150136" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Multiple star system in the constellation Ara ::

| image= |image=Ara constellation map.svg |float=center |alt= |label= |position=right |width=260 |mark=Red circle.svg |mark_width=10 |mark_link=HD 150136 |x=826|y=433 |caption=Location of HD 150136 (circled) | epoch=J2000 | constell=Ara | ra= | dec= | appmag_v=5.54 | class=O3 V((f*)) - O3.5 V((f+)) + O5.5-6 V((f)) + O6.5-7 V((f)) | r-i = | v-r = | b-v = +0.20 | u-b = −0.76 | variable= | radial_v=−27 | prop_mo_ra=+2.514 | prop_mo_dec=−4.309 | parallax=0.6934 | p_error=0.0484 | parallax_footnote= | dist_ly=1320 ± | absmag_v=−6.47 (−5.91 + −4.90 + −4.44) | reference = | primary = Primary | name = Secondary | period = | period_unitless = 2.67454 days | axis = | axis_unitless = | eccentricity = 0 | inclination = 53 | node = | periastron = | periarg = | periarg_primary = | k1 = 208.3 | k2 = 334.5 | reference = | primary = Primary/Secondary | name = Tertiary | period_unitless = | axis = 16.918 | axis_unitless = | eccentricity = 0.6780 | inclination = 106.11 | k1 = 22.1 | k2 = 70.6 | source= | component1=Primary | mass=54 | radius=12.13 | luminosity=724,000 | temperature=46,500 | metal_fe= | gravity=4.00 | rotational_velocity=171 | age_myr= | component2=Secondary | mass2=34 | radius2=9.54 | luminosity2=209,000 | temperature2=40,000 | metal_fe2= | gravity2=4.00 | rotational_velocity2=136 | age_myr2=0-2 | source= | component1=Tertiary | mass=27.1 | radius=8.24 | luminosity=102,000 | temperature=36,000 | metal_fe= | gravity=3.50 | rotational_velocity=72 | age_myr=1-3 | names=HD 150136, CD−48°11070, HIP 81702, HR 6187, SAO 227049, WDS J16413-4846 | Simbad=HD+150136 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.

System

::figure[src="https://upload.wikimedia.org/wikipedia/commons/9/91/Caldwell_82_(50291992637).jpg" caption="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 . 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.

The primary star consists of a double-lined spectroscopic binary 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.

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, , 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.

References

| display-authors=1 | journal=Astronomy & Astrophysics | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | title=SB9: The ninth catalogue of spectroscopic binary orbits | volume=424 | issue=2 | pages=727–732 | date=2004 | doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P |arxiv = astro-ph/0406573 | s2cid=119387088

| display-authors=1 | last1=Schild | first1=R. E. | last2=Garrison | first2=R. F. | last3=Hiltner | first3=W. A. | title=UBV photometry for southern OB stars | journal=Astrophysical Journal Supplement Series | volume=51 | pages=321–336 |date=April 1983 | doi=10.1086/190852 | bibcode=1983ApJS...51..321S

| display-authors=1 | last1=Sana | first1=H. | last2=Le Bouquin | first2=J.-B. | last3=Mahy | first3=L. | last4=Absil | first4=O. | last5=De Becker | first5=M. | last6=Gosset | first6=E. | title=Three-dimensional orbits of the triple-O stellar system HD 150136 | journal=Astronomy & Astrophysics | volume=553 | id=A131 | pages=5 | date=May 2013 | doi=10.1051/0004-6361/201321189 | bibcode=2013A&A...553A.131S |arxiv = 1304.3457 | s2cid=41993530 }}

References

1. {{cite Gaia DR3. 5940954177259978880
2. {{cite constellation. HD 150136
3. (2017). "Resolved astrometric orbits of ten O-type binaries". Astronomy and Astrophysics.
4. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal.
5. (2012). "Evidence for a physically bound third component in HD 150136". Astronomy & Astrophysics.

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