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]

Pi Pavonis

Location of π Pavonis (circled)
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
π Pav, CPD−63°4292, FK5 3437, GC 24665, HD 165040, HIP 88866, HR 6745, SAO 254147[10]
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]

References