This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
A tomographic study of V691 CrA (X1822−371)†
Article first published online: 5 NOV 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society
Volume 427, Issue 2, pages 1043–1051, 1 December 2012
How to Cite
Peris, C. S. and Vrtilek, S. D. (2012), A tomographic study of V691 CrA (X1822−371). Monthly Notices of the Royal Astronomical Society, 427: 1043–1051. doi: 10.1111/j.1365-2966.2012.22039.x
- Issue published online: 5 NOV 2012
- Article first published online: 5 NOV 2012
- Manuscript Accepted: 1 SEP 2012
- Manuscript Received: 8 AUG 2012
- accretion, accretion eclipsing;
- binaries: eclipsing;
- stars: individual: V691 CrA
We present Doppler and modulation tomography of the low-mass X-ray binary V691 CrA with data obtained using the 6.5-m Magellan Baade telescope at the Las Campanas Observatory in 2010 and 2011. The disc and hotspot are observed in Hα and He ii (λ4686) in both years. A clear image of the disc is seen in He ii (λ5411) using the 2010 data. We present the first tomography of the absorption line He i (λ5876) and detect absorption near the L1 point of the donor star. We also present the first modulation tomography of the emission line Hα and detect emission from the secondary. The Hα double peaks are imbedded in a deep absorption trough confirming the presence of Balmer line absorbing material in the system. Our observations of Hα show absorption in a larger phase range than in Hβ which could be due to heating up of sprayed matter from the hotspot as it travels downstream. We also suggest possible occultation of the Hα absorbing spray by the disc bulge at certain phases.