The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
Peredur M. Williams (1), Nidia I. Morrell (2), Konstantina Boutsia (2), and Philip Massey (3,4) ((1) Institute for Astronomy, University of, Edinburgh, Royal Observatory Edinburgh, (2) Las Campanas Observatory,, Carnegie Observatories, (3) Lowell Observatory, (4) Department of
TL;DR
This study reports on the dust formation episodes and binary nature of the Wolf-Rayet star HD 38030 in the Large Magellanic Cloud, revealing its colliding-wind binary status and episodic dust production.
Contribution
It provides new infrared and spectroscopic observations confirming episodic dust formation and identifying a binary companion, advancing understanding of dust production in Wolf-Rayet stars.
Findings
Dust formation occurred in 2018 and cooled by 2019-20.
Spectroscopy indicates a near O9.7III-IV companion.
Radial velocity shifts suggest a colliding-wind binary.
Abstract
Mid-infrared photometry of the Wolf-Rayet star HD 38030 in the Large Magellanic Cloud from the NEOWISE-R mission show it to have undergone a dust-formation episode in 2018 and the dust to have cooled in 2019-20. New spectroscopy with the MagE spectrograph on the Magellan I Baade Telescope in 2019 and 2020 show absorption lines attributable to a companion of type near O9.7III-IV. We found a significant shift in the radial velocity of the C IV 5801-12 blend compared with the RVs measured in 1984 and 1993. The results combine to suggest that HD 38030 is a colliding-wind binary having short-lived dust formation episodes, like the Galactic systems WR 140 and WR 19, but at intervals in excess of 20 yr.
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