| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 43m 50.99768s[2] |
| Declination | −63° 05′ 14.8029″[2] |
| Apparent magnitude (V) | 10.81[3] (10.71 - 10.82[4]) |
| Characteristics | |
| Spectral type | WN6o + O5V[5] |
| U−B color index | −0.19[3] |
| B−V color index | +0.83[3] |
| Variable type | Eclipsing binary[4] |
| Astrometry | |
| Radial velocity (Rv) | 8.00[6] km/s |
| Proper motion (μ) | RA: −5.921±0.052[7] mas/yr Dec.: −0.409±0.047[7] mas/yr |
| Parallax (π) | 0.2336 ± 0.0382 mas[7] |
| Distance | approx. 14,000 ly (approx. 4,300 pc) |
| Absolute magnitude (MV) | −6.2 (−5.2 + −5.7[8]) |
| Orbit[5][9] | |
| Primary | WR |
| Companion | O |
| Period (P) | 6.23930 days |
| Semi-major axis (a) | 0.3010" (68 R☉) |
| Eccentricity (e) | 0 |
| Inclination (i) | 67 ± 3° |
| Longitude of the node (Ω) | 3.10° |
| Semi-amplitude (K1) (primary) | 263 ± 4 km/s |
| Semi-amplitude (K2) (secondary) | 218 ± 9 km/s |
| Details | |
| WR | |
| Mass | 42.6 ± 3.6[10] M☉ |
| Radius | 5[10] R☉ |
| Luminosity | 127,000[5] L☉ |
| O | |
| Mass | 51.0 ± 2.8[10] M☉ |
| Radius | 12[10] R☉ |
| Luminosity | 880,000[5] L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
CD Crucis, also known as HD 311884, is an eclipsing binary star system in the constellation Crux. It is around 14,000 light years away near the faint open cluster Hogg 15. The binary contains a Wolf–Rayet star and is also known as WR 47.
- ^ Cite error: The named reference
Marchenkowas invoked but never defined (see the help page). - ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b c d Bhatt, H.; Pandey, J. C.; Kumar, B.; Singh, K. P.; Sagar, R. (2010). "X-ray emission characteristics of two Wolf-Rayet binaries: V444 Cyg and CD Cru". Monthly Notices of the Royal Astronomical Society. 402 (3): 1767. arXiv:0911.1489. Bibcode:2010MNRAS.402.1767B. doi:10.1111/j.1365-2966.2009.15999.x. S2CID 118455386.
- ^ 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 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Piatti, A. E.; Bica, E.; Santos, J. F. C.; Clariá, J. J. (2002). "A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47" (PDF). Astronomy and Astrophysics. 387: 108–116. Bibcode:2002A&A...387..108P. doi:10.1051/0004-6361:20020373.
- ^ Fahed, R.; Moffat, A. F. J. (2012). "Colliding winds in five WR+O systems of the Southern hemisphere". Monthly Notices of the Royal Astronomical Society. 424 (3): 1601. Bibcode:2012MNRAS.424.1601F. doi:10.1111/j.1365-2966.2012.20494.x.
- ^ a b c d Moffat, Anthony F. J.; Drissen, Laurent; Robert, Carmelle; Lamontagne, Robert; Coziol, Roger; Mousseau, Normand; Niemela, Virpi S.; Cerruti, Miguel A.; Seggewiss, Wilhelm; Van Weeren, Niels (1990). "Photometric and polarimetric variability and mass-loss rate of the massive binary Wolf-Rayet star HDE 311884 (WN6 + 05: V)". Astrophysical Journal. 350: 767. Bibcode:1990ApJ...350..767M. doi:10.1086/168429.