GZ Velorum

GZ Velorum is a single,^[12] orange-hued star in the southern constellation of Vela. It is a faint star but visible to the naked eye, having an apparent visual magnitude of 4.58.^[3] The star is located around 1,300 light years from Earth, as determined from its annual parallax shift of 2.4 mas.^[2] It is moving further away with a heliocentric radial velocity of +13 km/s.^[6]

GZ Velorum

An R band light curve for GZ Velorum, adapted from Kallinger (2019)[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Vela
Right ascension	10h 19m 36.75198s[2]
Declination	−55° 01′ 45.4852″[2]
Apparent magnitude (V)	4.578[3]
Characteristics
Spectral type	K2.5 II[4]
B−V color index	+1.635[3]
Variable type	LC[5]
Astrometry
Radial velocity (Rv)	+12.9±0.8[6] km/s
Proper motion (μ)	RA: −13.208[2] mas/yr Dec.: +1.232[2] mas/yr
Parallax (π)	2.4256±0.1938 mas[2]
Distance	1,300 ± 100 ly (410 ± 30 pc)
Absolute magnitude (MV)	−4.16[7]
Details
Mass	8.9±0.5[8] M☉
Radius	136[9] R☉
Luminosity	2,679 - 2,780[9] L☉
Surface gravity (log g)	2.0[10] cgs
Temperature	3,986[9] K
Metallicity [Fe/H]	−0.4[10] dex
Rotational velocity (v sin i)	2.0[10] km/s
Age	29.6±3.8[8] Myr
Other designations
GZ Vel, CD−54° 3415, FK5 2830, HD 89682, HIP 50555, HR 4063, SAO 237916[11]
Database references
SIMBAD	data

This is a bright giant star with a stellar classification of K2.5 II.^[4] The star was found to be a variable star when the Hipparcos data was analized, in 1996.^[13] It is a slow irregular variable of type LC^[5] with a frequency of 0.16585 cycles per day.^[14] In the R (red) band, the magnitude of the star ranges from 3.43 down to 3.81.^[5] The measured angular diameter of this star, after correction for limb darkening, is 3.17±0.04 mas.^[15] At the estimated distance of GZ Vel, this yields a physical size of about 140 times the radius of the Sun.^[16]

GZ Vel is 30 million years old with 9 times the mass of the Sun.^[8] It is radiating 9,241^[3] times the Sun's luminosity from its photosphere at an effective temperature of 4,140 K.^[3]