HD 93403

Last updated
HD 93403
Observation data
Epoch J2000       Equinox J2000
Constellation Carina
Right ascension 10h 45m 44.11931s [1]
Declination −59° 24′ 28.1431″ [1]
Apparent magnitude  (V)7.272 [2]
Characteristics
Spectral type O5.5III(fc)var [3] (O5.5I + O7V [4] )
U−B color index −0.747 [2]
B−V color index +0.212 [2]
Astrometry
Radial velocity (Rv)14.80 km/s
Proper motion (μ)RA: -7.27  mas/yr
Dec.: 2.45  mas/yr
Parallax (π)1.22 ± 0.45  mas [1]
Distance 3,200 [4]   pc
Orbit [5]
Period (P)15.093 days
Semi-major axis (a)121 R☉
Eccentricity (e)0.234
Inclination (i)~31°
Semi-amplitude (K1)
(primary)		79.3 km/s
Semi-amplitude (K2)
(secondary)		139.0 km/s
Details [4]
Primary
Mass 68.5 [5]   M☉
Radius 24  R☉
Luminosity 1,050,000  L☉
Temperature 39,300  K
Secondary
Mass 37.3 [5]   M☉
Radius 10  R☉
Luminosity257,000  L☉
Temperature 40,100  K
Other designations
HD  93403, HIP  52628, CD −58°3545, 2MASS J10454411-5924281, GSC 08626-00641, TYC 8626-641-1
Database references
SIMBAD data

HD 93403 is a spectroscopic binary containing two highly luminous hot blue stars. It is 10,000 light years away in the Carina Nebula in the constellation Carina. It appears to have spectral type O5.5III, but this is composed of two spectra from a blue supergiant and blue main sequence star of spectral type O5.5I and O7V respectively. The two stars orbit every 15 days with a separation that varies from 93 R☉ to 149 R☉. The binary is shedding mass at the high rate of 0.0005 M☉ per year. [3]

HD 93403 exhibits the Struve-Sahade effect, where the strength of the spectral lines of the individual components varies during the orbit. It also has colliding stellar winds that produce variable x-ray [6] and non-thermal radio emission. [7]

See also

Related Research Articles

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<span class="mw-page-title-main">S Monocerotis</span> Star in the constellation Monoceros

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<span class="mw-page-title-main">9 Sagittarii</span> Star in the constellation Sagittarius

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<span class="mw-page-title-main">WR 30a</span> Binary star in the constellation Carina

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HD 149404, also known as HR 6164 and V918 Scorpii, is a star about 4,300 light years from the Earth, in the constellation Scorpius. It is a 5th magnitude star, so it will be faintly visible to the naked eye of an observer far from city lights. It is a rotating ellipsoidal variable, a binary star for which the two stars' combined brightness varies slightly, from magnitude 5.42 to 5.50, during their 9.8 day orbital period. It is one of the brightest members of the Ara OB1 association, which has the open cluster NGC 6193 at its center.

References

  1. 1 2 3 van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi: 10.1051/0004-6361:20078357 . eISSN   1432-0746. ISSN   0004-6361.
  2. 1 2 3 Maíz-Apellániz, Jesús; Walborn, Nolan R.; Galué, Héctor Á.; Wei, Lisa H. (2004). "A Galactic O Star Catalog". The Astrophysical Journal Supplement Series. 151 (1): 103–148. arXiv: astro-ph/0311196 . Bibcode:2004ApJS..151..103M. doi:10.1086/381380. S2CID   118813863.
  3. 1 2 Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement Series. 211 (1): 84. arXiv: 1312.6222 . Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. S2CID   118847528. 10.
  4. 1 2 3 Rauw, G.; Vreux, J.-M.; Stevens, I. R.; Gosset, E.; Sana, H.; Jamar, C.; Mason, K. O. (2002). "Phase-resolved X-ray and optical spectroscopy of the massive binary HD 93403". Astronomy and Astrophysics. 388 (2): 552. Bibcode:2002A&A...388..552R. doi: 10.1051/0004-6361:20020523 .
  5. 1 2 3 Rauw, G.; Sana, H.; Gosset, E.; Vreux, J.-M.; Jehin, E.; Parmentier, G. (2000). "A new orbital solution for the massive binary system HD 93403". Astronomy and Astrophysics. 360: 1003. Bibcode:2000A&A...360.1003R.
  6. ↑ Analysis of the X-ray emission of OB stars: O stars
  7. ↑ Palate, M.; Rauw, G.; Koenigsberger, G.; Moreno, E. (2013). "Spectral modelling of massive binary systems". Astronomy & Astrophysics. 552: A39. arXiv: 1302.5201 . Bibcode:2013A&A...552A..39P. doi:10.1051/0004-6361/201219754. S2CID   54771449.
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