The WR 140 periastron passage 2009: first results from MONS and other optical sources
R. Fahed, A. F. J. Moffat, J. Zorec, T. Eversberg, A. N. Chen\'e, F., Alves, W. Arnold, T. Bergmann, L. F. Gouveia Carreira, F. Marques Dias, A., Fernando, J. Sanchez Gallego, T. Hunger, J. H. Knapen, R. Leadbeater, T., Morel, G. Rauw, N. Reinecke, J. Ribeiro, N. Romeo
TL;DR
This paper reports spectroscopic observations of the colliding wind binary WR140 during its 2009 periastron, providing updated orbital parameters, stellar masses, and mass-loss rate constraints.
Contribution
It offers the first detailed spectroscopic analysis of WR140 during its 2009 periastron, refining key orbital and stellar parameters.
Findings
Updated orbital parameters for WR140.
New estimates of WR and O star masses.
Constraints on mass-loss rates during periastron.
Abstract
We present the results from the spectroscopic follow-up of WR140 (WC7 + O4-5) during its last periastron passage in January 2009. This object is known as the archetype of colliding wind binaries and has a relatively large period (~ 8 years) and eccentricity (~ 0.89). We provide updated values for the orbital parameters, new estimates for the WR and O star masses and new constraints on the mass-loss rates.
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Taxonomy
TopicsAstro and Planetary Science · Solar and Space Plasma Dynamics · Stellar, planetary, and galactic studies