PU Puppis
Blue-giant star in the constellation Puppis
From Wikipedia, the free encyclopedia
PU Puppis (PU Pup) is a class B8III[3] (blue giant) star in the constellation Puppis. Its apparent magnitude is 4.69[2] and it is approximately 620 light years away based on parallax.[1]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 38m 18.04541s[1] |
| Declination | −25° 21′ 53.3017″[1] |
| Apparent magnitude (V) | 4.69[2] |
| Characteristics | |
| Spectral type | B8III[3] |
| U−B color index | −0.35[4] |
| B−V color index | −0.11[4] |
| Variable type | β Lyr[5] |
| Astrometry | |
| Radial velocity (Rv) | +41.00[6] km/s |
| Proper motion (μ) | RA: −3.03[1] mas/yr Dec.: −7.42[1] mas/yr |
| Parallax (π) | 5.27±0.26 mas[1] |
| Distance | 620 ± 30 ly (190 ± 9 pc) |
| Absolute magnitude (MV) | −1.80±0.25 (−1.77 + 5.85)[7] |
| Absolute bolometric magnitude (Mbol) | −2.35 + 5.54[7] |
| Orbit[7] | |
| Period (P) | 2.58237±0.00005 d |
| Semi-major axis (a) | 13.30 ± 0.40 R☉ |
| Inclination (i) | 56.2° |
| Details[7] | |
| PU Pup A | |
| Mass | 4.10±0.20 M☉ |
| Radius | 6.60±0.30 R☉ |
| Luminosity | 695±80 L☉ |
| Surface gravity (log g) | 3.40±0.05 cgs |
| Temperature | 11,500±500 K |
| Rotational velocity (v sin i) | 123[8] km/s |
| PU Pup B | |
| Mass | 0.65±0.05 M☉ |
| Radius | 0.90±0.10 R☉ |
| Luminosity | 0.50±0.10 L☉ |
| Surface gravity (log g) | 4.30±0.10 cgs |
| Temperature | 5,000±350 K |
| Other designations | |
| m Puppis, PU Pup, CD−25°4828, CCDM J07383-2522AB, GC 10266, HIP 37173, HR 2944, HD 61429, SAO 174175, WDS J07383-2522AB | |
| Database references | |
| SIMBAD | data |
It is a β Lyrae variable, ranging from 4.75 to 4.69 magnitude with a period of 2.58 days.[5] The secondary is estimated at 5.6 magnitude, although recent observations have failed to confirm it.[10][11] The primary has a mass of 4.10 solar masses, and is radiating at an effective temperature of 11,500 K. The secondary, with a mass 65% that of the Sun, has a surface temperature of about 5,000 K.[7]