HD 48099 is a spectroscopic binary in the constellation Monoceros where both components are massive and luminous O stars.

HD 48099

Location of JD 48099 (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Monoceros
Right ascension	06h 41m 59.2309s[1]
Declination	+06° 20′ 43.531″[1]
Apparent magnitude (V)	6.37[2]
Characteristics
Spectral type	O5.5V((f)) + O9V[3]
U−B color index	−0.94[2]
B−V color index	−0.05[2]
Astrometry
Radial velocity (Rv)	+1.30[4] km/s
Proper motion (μ)	RA: 0.84[1] mas/yr Dec.: 2.55[1] mas/yr
Parallax (π)	1.17 ± 0.41 mas[1]
Distance	1829[5] pc
Absolute magnitude (MV)	−5.6[6]
Orbit[3]
Period (P)	3.0786 days
Semi-major axis (a)	~33 R☉
Eccentricity (e)	0.0
Inclination (i)	16°
Semi-amplitude (K1) (primary)	54.4 km/s
Semi-amplitude (K2) (secondary)	96.2 km/s
Details[3]
Mass	55 M☉
Radius	11.6 R☉
Luminosity	450,000 L☉
Surface gravity (log g)	4.5 cgs
Temperature	44,000 K
Rotational velocity (v sin i)	330 km/s
secondary
Mass	19 M☉
Radius	6.5 R☉
Luminosity	40,000 L☉
Surface gravity (log g)	3.5 cgs
Temperature	32,000 K
Rotational velocity (v sin i)	185 km/s
Other designations
HR 2467, HD 48099, HIP 32067, SAO 114293, BD+06°1351
Database references
SIMBAD	data

Binary stars offer the opportunity to directly measure the mass of each component, but in the case the orbital inclination is very low and the masses cannot be accurately determined. The stars are orbiting extremely close together, separated only by about the diameters of the stars themselves. They complete one orbit in just over three days.[3]

Although HD 48099 only has a moderate space velocity of 37.7 km/s, it has produced a bow shock 2.26 parsecs from the star itself.[5]

References