Pi Pavonis
Astrometric binary star system in the constellation Pavo / From Wikipedia, the free encyclopedia
π Pavonis, Latinized as Pi Pavonis, is a candidate astrometric binary[11] star system in the constellation Pavo. It is a white-hued star that is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.33.[2] The distance to this object is 130 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −15.6 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pavo |
Right ascension | 18h 08m 34.81459s[1] |
Declination | −63° 40′ 06.7906″[1] |
Apparent magnitude (V) | 4.33[2] |
Characteristics | |
Spectral type | kA4hF0mF2 III[3] |
U−B color index | +0.17[4] |
B−V color index | +0.23[4] |
Astrometry | |
Radial velocity (Rv) | −15.60[5] km/s |
Proper motion (μ) | RA: +18.02[1] mas/yr Dec.: -207.57[1] mas/yr |
Parallax (π) | 25.09 ± 0.17 mas[1] |
Distance | 130.0 ± 0.9 ly (39.9 ± 0.3 pc) |
Absolute magnitude (MV) | 1.33[2] |
Details | |
Mass | 2.15[6] M☉ |
Radius | 2.84+0.42 −0.03[7] R☉ |
Luminosity | 24.69±0.36[7] L☉ |
Surface gravity (log g) | 3.81[8] cgs |
Temperature | 7,632+50 −510[7] K |
Metallicity [Fe/H] | 0.27[8] dex |
Rotational velocity (v sin i) | 30.0[9] km/s |
Age | 630[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The visible component is an chemically peculiar star that displays an abundance anomaly of strontium.[12][13] Grey et al. (1989) classify it as kA4hF0mF2 III,[3] matching a giant Am star with the calcium K line of an A4 star, the hydrogen lines of a cooler F0 star, and the metal lines of a F2 star. However, Loden and Sundman (1989) don't consider it to be a giant and list it as an Ap star.[12] It is 630[6] million years old with 2.15[6] times the mass of the Sun and 2.8[7] times the Sun's radius. The star is radiating 24.7[7] times the Sun's luminosity from its photosphere at an effective temperature of 7,632 K.[7]