HD 93403

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☉.

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[1] mas
Distance3,200[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
Mass68.5[5] M☉
Radius24 R☉
Luminosity1,050,000 L☉
Temperature39,300 K
Secondary
Mass37.3[5] M☉
Radius10 R☉
Luminosity257,000 L☉
Temperature40,100 K
Other designations
HD 93403, HIP 52628, CD−58°3545
Database references
SIMBADdata

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 x-ray and non-thermal radio emission.[6]

References
  1. Van Leeuwen, Floor (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.
  2. Maíz-Apellániz, Jesús; Walborn, Nolan R.; Galué, Héctor Á.; Wei, Lisa H. (2004). "A Galactic O Star Catalog". The Astrophysical Journal Supplement Series. 151: 103. arXiv:astro-ph/0311196. Bibcode:2004ApJS..151..103M. doi:10.1086/381380.
  3. 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. 10.
  4. 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. 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. 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.
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