Astronomy:HD 93403
From HandWiki
Short description: Binary star system in the constellation Carina
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 45m 44.11931s[1] |
| Declination | −59° 24′ 28.1431″[1] |
| Apparent magnitude (V) | 7.272[2] |
| Characteristics | |
| 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 |
| Distance | 3,200[3] pc |
| Orbit[4] | |
| 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[3] | |
| Primary | |
| Mass | 68.5[4] M☉ |
| Radius | 24 R☉ |
| Luminosity | 1,050,000 L☉ |
| Temperature | 39,300 K |
| Secondary | |
| Mass | 37.3[4] M☉ |
| Radius | 10 R☉ |
| Luminosity | 257,000 L☉ |
| Temperature | 40,100 K |
| Other designations | |
| 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.[5]
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
References
- ↑ 1.0 1.1 1.2 Van Leeuwen, Floor (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 Maíz-Apellániz, Jesús; Walborn, Nolan R.; Galué, Héctor Á.; Wei, Lisa H. (2004). "A Galactic O Star Catalog". The Astrophysical Journal Supplement Series 151 (1): 103–148. doi:10.1086/381380. Bibcode: 2004ApJS..151..103M.
- ↑ 3.0 3.1 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. doi:10.1051/0004-6361:20020523. Bibcode: 2002A&A...388..552R.
- ↑ 4.0 4.1 4.2 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.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedGOSSS - ↑ Analysis of the X-ray emission of OB stars: O stars
- ↑ Palate, M.; Rauw, G.; Koenigsberger, G.; Moreno, E. (2013). "Spectral modelling of massive binary systems". Astronomy & Astrophysics 552: A39. doi:10.1051/0004-6361/201219754. Bibcode: 2013A&A...552A..39P.
 |  |
