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Coordinates: Sky map 16h 34m 23.33330s, −04° 00′ 52.0171″
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{{reflist|30em|refs=
{{reflist|30em|refs=


<ref name=aaa474_2_653>{{cite journal | first=F. | last=van Leeuwen | year=2007 | month=November | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}</ref>
<ref name=aaa474_2_653>{{cite journal | first=F. | last=van Leeuwen | year=2007 | month=November | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 }}</ref>


<ref name=aj137_5>{{cite journal | last1=Landolt | first1=Arlo U. | month=May | year=2009 | title=UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions | journal=The Astronomical Journal | volume=137 | issue=5 | pages=4186–4269 | doi=10.1088/0004-6256/137/5/4186 | bibcode=2009AJ....137.4186L }} See table II.</ref>
<ref name=aj137_5>{{cite journal | last1=Landolt | first1=Arlo U. | month=May | year=2009 | title=UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions | journal=The Astronomical Journal | volume=137 | issue=5 | pages=4186–4269 | doi=10.1088/0004-6256/137/5/4186 | bibcode=2009AJ....137.4186L |arxiv = 0904.0638 }} See table II.</ref>


<ref name=SIMBAD>{{cite web | title=HD 149382 -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+149382 | accessdate=2010-10-06 }}</ref>
<ref name=SIMBAD>{{cite web | title=HD 149382 -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+149382 | accessdate=2010-10-06 }}</ref>
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<ref name=mnras374_2_664>{{cite journal | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | last8=Gorgas | first8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 | month=January | year=2007 | doi=10.1111/j.1365-2966.2006.11196.x | bibcode=2007MNRAS.374..664C | arxiv=astro-ph/0611618 }}</ref>
<ref name=mnras374_2_664>{{cite journal | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | last8=Gorgas | first8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 | month=January | year=2007 | doi=10.1111/j.1365-2966.2006.11196.x | bibcode=2007MNRAS.374..664C | arxiv=astro-ph/0611618 }}</ref>


<ref name=apjl702_1_L96>{{cite journal | display-authors=1 | last1=Geier | first1=S. | last2=Edelmann | first2=H. | last3=Heber | first3=U. | last4=Morales-Rueda | first4=L. | title=Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution | journal=The Astrophysical Journal Letters | volume=702 | issue=1 | pages=L96–L99 | month=September | year=2009 | doi=10.1088/0004-637X/702/1/L96 | bibcode=2009ApJ...702L..96G }}</ref>
<ref name=apjl702_1_L96>{{cite journal | display-authors=1 | last1=Geier | first1=S. | last2=Edelmann | first2=H. | last3=Heber | first3=U. | last4=Morales-Rueda | first4=L. | title=Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution | journal=The Astrophysical Journal Letters | volume=702 | issue=1 | pages=L96–L99 | month=September | year=2009 | doi=10.1088/0004-637X/702/1/L96 | bibcode=2009ApJ...702L..96G |arxiv = 0908.1025 }}</ref>


<ref name=sherrod_koed2003>{{cite book | first1=P. Clay | last1=Sherrod | first2=Thomas L. | last2=Koed | title=A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations | series=Astronomy Series | publisher=Courier Dover Publications | year=2003 | isbn=0-486-42820-6 | page=9 | url=http://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 }}</ref>
<ref name=sherrod_koed2003>{{cite book | first1=P. Clay | last1=Sherrod | first2=Thomas L. | last2=Koed | title=A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations | series=Astronomy Series | publisher=Courier Dover Publications | year=2003 | isbn=0-486-42820-6 | page=9 | url=http://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 }}</ref>
<ref name=apj743_1_88>{{citation | display-authors=1 | last1=Norris | first1=Jackson M. | last2=Wright | first2=Jason T. | last3=Wade | first3=Richard A. | last4=Mahadevan | first4=Suvrath | last5=Gettel | first4=Sara | title=Non-detection of the Putative Substellar Companion to HD 149382 | journal=The Astrophysical Journal | volume=743 | issue=1 | page=88 | month=December | year=2011 | doi=10.1088/0004-637X/743/1/88 | bibcode=2011ApJ...743...88N }}</ref>
<ref name=apj743_1_88>{{citation | display-authors=1 | last1=Norris | first1=Jackson M. | last2=Wright | first2=Jason T. | last3=Wade | first3=Richard A. | last4=Mahadevan | first4=Suvrath | last5=Gettel | first4=Sara | title=Non-detection of the Putative Substellar Companion to HD 149382 | journal=The Astrophysical Journal | volume=743 | issue=1 | page=88 | month=December | year=2011 | doi=10.1088/0004-637X/743/1/88 | bibcode=2011ApJ...743...88N |arxiv = 1110.1384 }}</ref>


}}
}}

Revision as of 01:17, 30 August 2012

HD 149382

Artist's impression of an unconfirmed brown dwarf HD 149382 b (center) in orbit around the star HD 149382 (right).
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 34m 23.33330s[1]
Declination –04° 00′ 52.0171″[1]
Apparent magnitude (V) 8.943[2]
Characteristics
Spectral type B5 VI[3]
U−B color index –1.143[2]
B−V color index –0.282[2]
V−R color index –0.127[2]
R−I color index –0.135[2]
Astrometry
Radial velocity (Rv)+3[4] km/s
Proper motion (μ) RA: –5.95[1] mas/yr
Dec.: –3.92[1] mas/yr
Parallax (π)13.53 ± 1.15 mas[1]
Distance240 ± 20 ly
(74 ± 6 pc)
Details
Mass0.29−0.53[5] M☉
Surface gravity (log g)5.80 ± 0.05[5] cgs
Temperature35,500 ± 500[5] K
Metallicity [Fe/H]−1.30[3] dex
Rotational velocity (v sin i)4.9 ± 1.4[5] km/s
Other designations
BD-03 3967, HD 149382, HIP 81145, SAO 141250[6]
Database references
SIMBADdata

HD 149382 is a star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.[2] This is too faint to be seen with the naked eye even under ideal conditions, although it can be viewed with a small telescope.[7] Based upon parallax measurements,[1] this star is located at a distance of about 240 light-years (74 parsecs) from the Earth.

This is the brightest known B-type subdwarf star with a stellar classification of B5 VI. It is generating energy through the thermonuclear fusion of helium at its core.[3] The effective temperature of the star's outer envelope is about 35,500 K, giving it the characteristic blue-white hue of a B-type star. HD 149382 has an optical companion located at an angular separation of 1 arcsecond.[8]

In 2009, a substellar companion, perhaps even a superjovian planet, was announced orbiting the star.[5] This candidate object was estimated to have nearly half the mass of the Sun. In 2011, this discovery was thrown into doubt when an independent team of astronomers were unable to confirm the detection. Their observations rule out a companion with a mass greater than Jupiter orbiting with a period of less than 28 days.[8]

The unconfirmed HD 149382 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >8-23 MJ 0.02343 2.391 0 39±13° —

See also

References

  1. ^ a b c d e f 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. {{cite journal}}: Unknown parameter |month= ignored (help)
  2. ^ a b c d e f Landolt, Arlo U. (2009). "UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions". The Astronomical Journal. 137 (5): 4186–4269. arXiv:0904.0638. Bibcode:2009AJ....137.4186L. doi:10.1088/0004-6256/137/5/4186. {{cite journal}}: Unknown parameter |month= ignored (help) See table II.
  3. ^ a b c Cenarro, A. J.; et al. (2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society. 374 (2): 664–690. arXiv:astro-ph/0611618. Bibcode:2007MNRAS.374..664C. doi:10.1111/j.1365-2966.2006.11196.x. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: unflagged free DOI (link)
  4. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
  5. ^ a b c d e Geier, S.; et al. (2009). "Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution". The Astrophysical Journal Letters. 702 (1): L96–L99. arXiv:0908.1025. Bibcode:2009ApJ...702L..96G. doi:10.1088/0004-637X/702/1/L96. {{cite journal}}: Unknown parameter |month= ignored (help)
  6. ^ "HD 149382 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-10-06.
  7. ^ Sherrod, P. Clay; Koed, Thomas L. (2003). A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations. Astronomy Series. Courier Dover Publications. p. 9. ISBN 0-486-42820-6.
  8. ^ a b Norris, Jackson M.; et al. (2011), "Non-detection of the Putative Substellar Companion to HD 149382", The Astrophysical Journal, 743 (1): 88, arXiv:1110.1384, Bibcode:2011ApJ...743...88N, doi:10.1088/0004-637X/743/1/88 {{citation}}: Unknown parameter |month= ignored (help)


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