The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
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 λλ5801-12 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2021
- DOI:
- 10.1093/mnras/stab1625
- arXiv:
- arXiv:2106.03781
- Bibcode:
- 2021MNRAS.505.5029W
- Keywords:
-
- binaries: spectroscopic;
- circumstellar matter;
- stars: individual: HD 38030;
- stars: winds;
- stars: Wolf-Rayet;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 8 pages, 6 figures, accepted for publication in the MNRAS