| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina1 |
| Right ascension | 10h 45m 44.11931s2 |
| Declination | −59° 24′ 28.1431″2 |
| Apparent magnitude (V) | 7.2723 |
| Characteristics | |
| Spectral type | O5.5III(fc)var4 (O5.5I + O7V5) |
| U−B color index | −0.7473 |
| B−V color index | +0.2123 |
| Astrometry | |
| Radial velocity (Rv) | 14.806 km/s |
| Proper motion (μ) | RA: −6.326 mas/yr2 Dec.: +2.306 mas/yr2 |
| Parallax (π) | 0.1927±0.0706 mas2 |
| Distance | 3,2005 pc |
| Absolute magnitude (MV) | −5.6757 |
| Orbit8 | |
| 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 |
| Details5 | |
| Primary | |
| Mass | 68.58 M☉ |
| Radius | 24 R☉ |
| Luminosity | 1,050,000 L☉ |
| Temperature | 39,300 K |
| Secondary | |
| Mass | 37.38 M☉ |
| Radius | 10 R☉ |
| Luminosity | 257,000 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-ray9 and non-thermal radio emission.10
References
References
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.