KQ Puppis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 33m 47.96383s |
| Declination | −14° 31′ 26.0026″ |
| Apparent magnitude (V) | +4.97 (4.82 - 5.17) |
| Characteristics | |
| Cool primary | |
| Evolutionary stage | Red supergiant |
| Spectral type | M2Iab |
| U−B color index | +0.29 |
| B−V color index | +1.41 |
| Variable type | Slow irregular variable |
| Hot secondary | |
| Evolutionary stage | B-type main-sequence star |
| Spectral type | B0Ve |
| Astrometry | |
| Radial velocity (Rv) | +22 km/s |
| Proper motion (μ) | RA: -7 mas/yr Dec.: +4 mas/yr |
| Parallax (π) | 1.353±0.144 mas |
| Distance | 2720+260 −230 ly (833.4+79.8 −70.4 pc) |
| Orbit | |
| Period (P) | 9,752 days (26.70 years) |
| Eccentricity (e) | 0.46 |
| Inclination (i) | 60-80° |
| Details | |
| Cool primary | |
| Mass | 13-20 M☉ |
| Radius | 570 R☉ |
| Luminosity | 59,800 L☉ |
| Temperature | 3,662 K |
| Age | 12.6±1.4 Myr |
| Hot secondary | |
| Mass | 17 M☉ |
| Radius | 4.35 R☉ |
| Luminosity | 13,800 L☉ |
| Temperature | 30,000 K |
| Age | 12.6±1.4 Myr |
| Other designations | |
| KQ Pup, BD−14°1971, HIP 36773, HR 2902, NGC 2422 9, SAO 153072 | |
| Primary: HD 60414 | |
| Secondary: HD 60415 | |
| Database references | |
| SIMBAD | data |
KQ Puppis (KQ Pup) is a spectroscopic binary located about 2,700 light-years from Earth in the constellation Puppis. A red supergiant star and a B-type main-sequence star orbit each other every 27 years. Its apparent magnitude varies between 4.82 and 5.17, making it faintly visible to the naked eye.
The KQ Puppis system consists of a fairly typical M2 supergiant, in orbit with a hotter less luminous star. The hotter star is surrounded by a disc of material being transferred from the cool supergiant. This type of binary is referred to as a VV Cephei system, although in this case there are no eclipses of either star. A portion of the disc does appear to be eclipsed and this is detected as a strong drop in far-ultraviolet radiation for about a third of the orbit.
The red supergiant primary star has been compared to Betelgeuse. It shows small amplitude irregular pulsations, and also some variation associated with the orbital motion. The nature of the secondary is less certain. The spectrum shows high excitation features that would indicate an early B or hotter spectral type, but these may be associated with the disc rather than that star itself. Other studies have found a spectrum similar to an A supergiant, but this is thought to be an artefact of a B-type shell star.
KQ Puppis has been catalogued as an outlying member of the open cluster Messier 47 (NGC 2422) and would be the brightest member of that cluster. Membership is uncertain as it appears to be more distant than the other stars in the cluster.