Fundamental parameters of the massive eclipsing binary HM1 8

Abstract

We present a comprehensive study of the massive binary system HM1~8, based on multi-epoch high resolution spectroscopy, $V$-band photometry and archival X-ray data. Spectra from the OWN Survey, a high resolution optical monitoring of Southern O and WN stars, are used to analyse the spectral morphology and perform quantitative spectroscopic analysis of both stellar components. The primary and secondary components are classified as O4.5~IV(f) and O9.7~V, respectively. From a radial-velocity (RV) study we derived a set of orbital parameters for the system. We found an eccentric orbit ($e=0.14\pm 0.01$) with a period of $P=5.87820\pm 0.00008$~days. Through the simultaneous analysis of the RVs and the $V$-band light curve we derived an orbital inclination of $70.0^{\circ }\pm 2.0$ and stellar masses of $M_a=33.6^{+1.4}_{-1.2}~\text{M}_{\sun}$ for the primary, and $M_b=17.7^{+0.5}_{-0.7}~\text{M}_{\sun}$ for the secondary. The components show projected rotational velocities $v_1\sin i=105\pm 14{\text{km s}}^{-1}$ and $v_2\sin i=82\pm 15{\text{km s}}^{-1}$, respectively. A tidal evolution analysis is also performed and found to be in agreement with the orbital characteristics. Finally, the available X-ray observations show no evidence of a colliding winds region, therefore the X-ray emission is attributed to stellar winds.

arXiv comment15 pages, 15 figures, to be published in MNRAS

References in corpus (34)

• On the Absorption of X-rays in the Interstellar Medium
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• Binary interaction dominates the evolution of massive stars
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Toward Understanding Massive Star Formation
• A new calibration of stellar parameters of Galactic O stars
• Pre-Supernova Evolution of Massive Single and Binary Stars
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• Compact Object Modeling with the StarTrack Population Synthesis Code
• The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars
• New Grids of ATLAS9 Model Atmospheres
• Atmospheric NLTE-Models for the Spectroscopic Analysis of Blue Stars with Winds. II. Line-Blanketed Models
• The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
• UBVJHK synthetic photometry of Galactic O stars
• The IACOB project: I. Rotational velocities in Northern Galactic O and early B-type stars revisited. The impact of other sources of line-broadening
• The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turn-offs. II. Results from 12 Galactic Clusters and OB Associations
• The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
• Fourier method in the determination of rotational velocities in OB stars
• An XMM-Newton view of the young open cluster NGC 6231 -- II. The OB star population
• The IACOB project: III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars
• Optical-NIR dust extinction towards Galactic O stars
• The IACOB project: A grid-based automatic tool for the quantitative spectroscopic analysis of O-stars
• Thin-shell mixing in radiative wind-shocks and the Lx-Lbol scaling of O-star X-rays
• Photometric and Spectroscopic Studies of Massive Binaries in the Large Magellanic Cloud. I. Introduction and Orbits for Two Detached Systems: Evidence for a Mass Discrepancy?
• The multiplicity of massive stars
• A Code for Stellar Binary Evolution and its Application to the Formation of Helium White Dwarfs
• The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems
• A spectroscopic investigation of the O-type star population in four Cygnus OB associations. I. Determination of the binary fraction
• Spectral modelling of massive binary systems
• The X-ray catalog of spectroscopically identified Galactic O stars: Investigating the dependence of X-ray luminosity on stellar and wind parameters
• The coupled effect of tides and stellar winds on the evolution of compact binaries
• Apsidal motion in the massive binary HD152218
• Spectroscopic patch model for massive stars using PHOEBE II and FASTWIND
• X-ray properties of the young open clusters HM1 and IC2944/2948

Cited by in corpus (1)

• Impact of tides on non-coplanar orbits of progenitors of high-mass X-ray binaries