HD 37519

HD 37519 is a star in the northern constellation Auriga. It has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 6.04.^[3] The distance to HD 37519 is approximately 810 light years based on parallax, but it is drifting closer with a radial velocity of −10 km/s.^[6]

HD 37519

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga[1]
Right ascension	05h 40m 35.90737s[2]
Declination	+31° 21′ 29.5262″[2]
Apparent magnitude (V)	6.04[3]
Characteristics
Spectral type	B9.5III-IV(p)? (Hg?)[4]
U−B color index	−0.21[3]
B−V color index	+0.05[3]
Variable type	suspected[5]
Astrometry
Radial velocity (Rv)	−10.2±3.4[6] km/s
Proper motion (μ)	RA: −5.051[2] mas/yr Dec.: −8.187[2] mas/yr
Parallax (π)	4.0335±0.1112 mas[2]
Distance	810 ± 20 ly (248 ± 7 pc)
Absolute magnitude (MV)	−0.43[7]
Details
Mass	2.8[8] M☉
Radius	6.2[9] R☉
Luminosity	221[9] L☉
Surface gravity (log g)	3.88[8] cgs
Temperature	10,677[8] K
Rotational velocity (v sin i)	195[10] km/s
Age	375[7] Myr
Other designations
NSV 2537, BD+31°1048, FK5 2425, HD 37519, HIP 26712, HR 1938, SAO 58319[11]
Database references
SIMBAD	data

Cowley in 1972 found a stellar classification of B9.5III-IV(p)? (Hg?) for this star,^[4] suggesting it is an evolved B-type star and a suspected chemically peculiar star of the mercury-manganese type.^[12] It is estimated to be 375 million years old and with a high rate of spin, showing a projected rotational velocity of 195 km/s.^[10] In March 1964, a suspected flare of HD 37519 was detected that increased the star's brightness by about three magnitudes. Smaller variations of up to two magnitudes were detected a few days later,^[13] suggesting there might be a flare star companion. However, follow-up observations failed to confirm the variability.^[14] The star is radiating 221 times the luminosity of the Sun^[9] from its photosphere at an effective temperature of 10,677 K.^[8]>