A new investigation of the binary HD 48099

Abstract

With an orbital period of about 3.078 days, the double-lined spectroscopic binary HD 48099 is, still now, the only short-period O+O system known in the Mon OB2 association. Even though an orbital solution has already been derived for this system, few information are available about the individual stars. We present, in this paper, the results of a long-term spectroscopic campaign. We derive a new orbital solution and apply a disentangling method to recover the mean spectrum of each star. To improve our knowledge concerning both components, we determine their spectral classifications and their projected rotational velocities. We also constrain the main stellar parameters of both stars by using the CMFGEN atmosphere code and provide the wind properties for the primary star through the study of IUE spectra. This investigation reveals that HD 48099 is an O5.5 V((f))+O9 V binary with M_1 sin^3 i = 0.70 M_{\sun} and M_2 sin^3 i = 0.39 M_{\sun}, implying a rather low orbital inclination. This result, combined with both a large effective temperature and log g, suggests that the primary star (v sini ~ 91 km s^-1) is actually a fast rotator with a strongly clumped wind and a nitrogen abundance of about 8 times the solar value.

12 pages, 7 figures, accepted by ApJ

References in corpus (7)

• UBVJHK synthetic photometry of Galactic O stars
• Rotational mixing in massive binaries: detached short-period systems
• Spectroscopic analysis of southern B and Be stars
• Properties of WNh stars in the Small Magellanic Cloud: evidence for homogeneous evolution
• Early-type stars in the young open cluster NGC 2244 and in the Mon OB2 association I. The multiplicity of O-type stars
• High resolution optical spectroscopy of Plaskett's star
• The nature of the line profile variability in the spectrum of the massive binary HD 152219

Cited by in corpus (20)

• The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars
• The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
• The MiMeS survey of magnetism in massive stars: Magnetic analysis of the O-type stars
• A quantitative study of O stars in NGC2244 and the Mon OB2 association
• Identifying quiescent compact objects in massive Galactic single-lined spectroscopic binaries
• MONOS: Multiplicity Of Northern O-type Spectroscopic systems. I. Project description and spectral classifications and visual multiplicity of previously known objects
• The Tarantula Massive Binary Monitoring VI: Characterisation of hidden companions in 51 single-lined O-type binaries, a flat mass-ratio distribution, and black-hole binary candidates
• Multiplicity of Galactic Luminous Blue Variable stars
• A magnetic massive star has experienced a stellar merger
• The two components of the evolved massive binary LZ Cep. Testing the effects of binarity on stellar evolution
• Galactic Kinematics from a Sample of Young Massive Stars
• First orbital solution for the non-thermal emitter Cyg OB2 #9
• High-precision broad-band linear polarimetry of early-type binaries I. Discovery of variable, phase-locked polarization in HD 48099
• Optical polarimetry: Methods, Instruments and Calibration Techniques
• BAT99 126: A multiple Wolf-Rayet system in the Large Magellanic Cloud with a massive near-contact binary
• Are magnetic fields universal in O-type multiple systems?
• Eclipsing high-mass binaries I. Light curves and system parameters for CPD-518946, PISMIS24-1 and HD319702
• Quantitative spectroscopy of multiple OB stars: I. The quadruple system HD 37061 at the centre of Messier 43
• Quantitative spectroscopy of close binary stars
• WR 63: A multiple system (O+O)+WR ?