CX Canis Majoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 22m 00.98686s[2] |
| Declination | −25° 52′ 35.9276″[2] |
| Apparent magnitude (V) | 9.89 (-10.14) - 10.42[3] |
| Characteristics | |
| Evolutionary stage | B5V[4] |
| Variable type | Algol[3] |
| Astrometry | |
| Proper motion (μ) | RA: −2.656[2] mas/yr Dec.: 2.777[2] mas/yr |
| Parallax (π) | 0.7147±0.0586 mas[2] |
| Distance | 4,600 ± 400 ly (1,400 ± 100 pc) |
| Details | |
| A | |
| Mass | 5.9[5] M☉ |
| Temperature | 15,200[5] K |
| B | |
| Mass | 3.4[5] M☉ |
| Temperature | 10,600[5] K |
| Other designations | |
| CD−25 4424, TYC 6541-1691-1[6] | |
| Database references | |
| SIMBAD | data |
CX CMa (CX Canis Majoris) is a blue variable star in the Canis Major constellation.[6][7] Discovery of this variable is usually credited to German Astronomer Cuno Hoffmeister in 1931, although this remains uncertain.[8]
It is an eclipsing binary of Algol (detached)[3] whose magnitude varies between 9.9 and 10.4 with a period of 0.95462500 day (22.911000 hour).[7] The variability was first discovered in 1931.[9] Doubts arose because of scatter in the data and the small amplitude,[10] but the discovery was confirmed by 1949.[11] Its Algol-type light curve exhibits the O'Connell effect, meaning that there is a magnitude difference between subsequent maxima.[12]
The temperature of the secondary star has been estimated at 10,600 K and its mass at 3.4 M☉. The spectral type of the secondary star is estimated to be in the B8 to A0 range.[13]
References
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