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Near-IR spectroscopic monitoring of WR 140 (WC7pd+O4-5) during the 2001 periastron passage

Published online by Cambridge University Press:  26 May 2016

Watson P. Varricatt ,
Peredur M. Williams  and
Nagarhalli M. Ashok
Watson P. Varricatt
Affiliation:
Joint Astronomy Centre, Hawai'i Headquarters, University Park, 660 North A'ohoku Place, Hilo, HI 96720, USA
Peredur M. Williams
Affiliation:
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, Scotland
Nagarhalli M. Ashok
Affiliation:
Astronomy and Astrophysics Division, Physical Research Laboratory, Navrangpura, Ahmedabad, 380009 India

Abstract

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The near-IR spectrum of the periodic dust making WCpd+O4-5 binary WR 140 was monitored to cover the 2001 periastron passage and maximum colliding-wind activity. The He i λ1.083μm emission-line profile showed the appearence of a subpeak on epochs close to periastron passage. The evolution of the subpeak was consistent with the motion of the stars and the colliding wind region. The appearance and evolution of the emission subpeak suggests that the theoretical 1/r dependence of X-ray flux does not hold, so that there is no need to change the values of eccentricity and epoch of periastron passage derived from the RV orbit. JHK spectra show variations of the continuum and and dilution of the emission lines, in agreement with the production and cooling of dust.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 253 - 254
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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