The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
arXiv:2106.03781 · doi:10.1093/mnras/stab1625
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.
arXiv comment8 pages, 6 figures, accepted for publication in the MNRAS
References in corpus (26)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
- Initial Performance of the NEOWISE Reactivation Mission
- A distance to the Large Magellanic Cloud that is precise to one per cent
- The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
- The VMC Survey - I. Strategy and First Data
- The Second Survey of the Molecular Clouds in the Large Magellanic Cloud by NANTEN I: Catalog of Molecular Clouds
- Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud
- The VISTA Science Archive
- The MagE Spectrograph
- Stellar and Wind Properties of LMC WC4 stars - A metallicity dependence for Wolf-Rayet mass-loss rates
- The VLT-FLAMES Tarantula Survey XIV. The O-Type Stellar Content of 30 Doradus
- A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds. IV. A Final Census
- Orbitally modulated dust formation by the WC7+O5 colliding-wind binary WR140
- Proper motions of new dust in the colliding-wind binary WR 140
- An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. I. The Chandra ACIS Dataset
- AKARI Infrared Camera Survey of the Large Magellanic Cloud. I. Point Source Catalog
- Quantitative spectral classification of Galactic O stars
- Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
- Revealing Efficient Dust-Formation at Low Metallicity in Extragalactic Carbon-Rich Wolf-Rayet Binaries
- Dust formation by the colliding-wind WC5+O9 binary WR19 at periastron passage
- New X-ray detections of known Wolf-Rayet stars
- Conditions in the WR 140 wind-collision region revealed by the 1.083-micron He I line profile
- Variable dust formation by the colliding-wind Wolf-Rayet system HD 36402 in the Large Magellanic Cloud
- Cross-matching DENIS and 2MASS Point Sources towards the Magellanic Clouds