&sq=Qlik&lang=&file=File:NGC_602c_HLA.jpg) AB8 is the brightest star in the cluster NGC 602c. Credit: Hubble Legacy Archive | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 01h 31m 04.13s[1] |
| Declination | −73° 25′ 03.8″[1] |
| Apparent magnitude (V) | 12.83[2] |
| Characteristics | |
| Spectral type | WO4 + O4V[3] |
| U−B color index | −1.17[2] |
| B−V color index | −0.16[2] |
| Astrometry | |
| Radial velocity (Rv) | 237.97 ± 1.15[3] km/s |
| Distance | 197,000 ly (61,000 pc) |
| Absolute magnitude (MV) | −6.3[4] (−4.9/−5.9) |
| Orbit[3] | |
| Period (P) | 16.638 days |
| Semi-major axis (a) | 108 R☉ |
| Eccentricity (e) | 0.10 ± 0.03 |
| Inclination (i) | 40 ± 10° |
| Semi-amplitude (K1) (primary) | 157 km/s |
| Semi-amplitude (K2) (secondary) | 54.7 ± 1.6 km/s |
| Details[4] | |
| WR | |
| Mass | 19 M☉ |
| Radius | 2 R☉ |
| Luminosity | 1,400,000 L☉ |
| Surface gravity (log g) | 5.1 cgs |
| Temperature | 141,000 K |
| O | |
| Mass | 61 M☉ |
| Radius | 14 R☉ |
| Luminosity | 708,000 L☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 45,000 K |
| Rotational velocity (v sin i) | 120 km/s |
| Age | 3.0 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
AB8, also known as SMC WR8, is a binary star in the Small Magellanic Cloud (SMC). A Wolf-Rayet star and a main sequence companion of spectral type O orbit in a period of 16.638 days. It is one of only nine known WO stars, the only Wolf-Rayet star in the SMC not on the nitrogen sequence, and the only Wolf-Rayet star in the SMC outside the main bar.
- ^ a b Cutri RM, Skrutskie MF, Van Dyk SD, Beichman CA, Carpenter JM, Chester T, et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ a b c Massey P (2002). "A UBVR CCD Survey of the Magellanic Clouds". The Astrophysical Journal Supplement Series. 141 (1): 81–122. arXiv:astro-ph/0110531. Bibcode:2002ApJS..141...81M. doi:10.1086/338286. S2CID 119447348.
- ^ a b c St-Louis N, Moffat AF, Marchenko S, Pittard JM (2005). "FUSE Observations of the SMC 16 day Wolf-Rayet Binary Sanduleak 1 (WO4+O4): Atmospheric Eclipses and Colliding Stellar Winds". The Astrophysical Journal. 628 (2): 953–972. Bibcode:2005ApJ...628..953S. doi:10.1086/430585.
- ^ a b Shenar T, Hainich R, Todt H, Sander A, Hamann WR, Moffat AF, et al. (2016). "Wolf-Rayet stars in the Small Magellanic Cloud: II. Analysis of the binaries". Astronomy & Astrophysics. 1604: A22. arXiv:1604.01022. Bibcode:2016A&A...591A..22S. doi:10.1051/0004-6361/201527916. S2CID 119255408.