HD 93403

Last updated
HD 93403
Observation data
Epoch J2000       Equinox J2000
Constellation Carina [1]
Right ascension 10h 45m 44.11931s [2]
Declination −59° 24′ 28.1431″ [2]
Apparent magnitude  (V)7.272 [3]
Characteristics
Spectral type O5.5III(fc)var [4] (O5.5I + O7V [5] )
U−B color index −0.747 [3]
B−V color index +0.212 [3]
Astrometry
Radial velocity (Rv)14.80 [6] km/s
Proper motion (μ)RA: −6.326 mas/yr [2]
Dec.: +2.306 mas/yr [2]
Parallax (π)0.1927±0.0706  mas [2]
Distance 3,200 [5]   pc
Absolute magnitude  (MV)−5.675 [7]
Orbit [8]
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 [5]
Primary
Mass 68.5 [8]   M☉
Radius 24  R☉
Luminosity 1,050,000  L☉
Temperature 39,300  K
Secondary
Mass 37.3 [8]   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 about 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. [4]

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 [9] and non-thermal radio emission. [10]

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 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.
  4. 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.
  5. 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 .
  6. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424: 727. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.
  7. ↑ Nebot Gómez-Morán, A.; Oskinova, L. M. (2018). "The X-ray catalog of spectroscopically identified Galactic O stars. Investigating the dependence of X-ray luminosity on stellar and wind parameters". Astronomy and Astrophysics. 620. arXiv: 1808.07880 . Bibcode:2018A&A...620A..89N. doi:10.1051/0004-6361/201833453.
  8. 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.
  9. ↑ Ryspaeva, Elizaveta; Kholtygin, Alexander (2018). "Analysis of the X-ray emission of OB stars: O stars". Research in Astronomy and Astrophysics. 18 (8): 104. Bibcode:2018RAA....18..104R. doi:10.1088/1674-4527/18/8/104.
  10. ↑ 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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