Copperwheat, C. M., Marsh, T. R., Parsons, S. G. et al. (6 more authors) (2012) A J-band detection of the donor star in the dwarf nova OY Carinae and an optical detection of its ’iron curtain’. Monthly Notices of the Royal Astronomical Society, 421 (1). pp. 149-158. ISSN 0035-8711
Abstract
Purely photometric models can be used to determine the binary parameters of eclipsing cataclysmic variables (CVs) with a high degree of precision. However, the photometric method relies on a number of assumptions, and to date there have been very few independent checks of this method in the literature. We present time-resolved spectroscopy of the P= 90.9 min eclipsing CV OY Carinae obtained with X-shooter on the Very Large Telescope (VLT), in which we detect the donor star from K I lines in the J band. We measure the radial velocity amplitude of the donor star K2= 470.0 ± 2.7 km s−1, consistent with predictions based upon the photometric method (470 ± 7 km s−1). Additionally, the spectra obtained in the UVB arm of X-shooter show a series of Fe I and Fe II lines with a phase and velocity consistent with an origin in the accretion disc. This is the first unambiguous detection at optical wavelengths of the ‘iron curtain’ of disc material which has been previously reported to veil the white dwarf in this system. The velocities of these lines do not track the white dwarf, reflecting a distortion of the outer disc that we see also in Doppler images. This is evidence for considerable radial motion in the outer disc, at up to 90 km s−1 towards and away from the white dwarf.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS Oxford University Press. This is an author produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | binaries: close; stars: dwarf novae; stars: individual: OY Carinae; white dwarfs. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 30 Nov 2016 15:52 |
Last Modified: | 29 Mar 2018 07:38 |
Published Version: | http://dx.doi.org/10.1111/j.1365-2966.2011.20282.x |
Status: | Published |
Publisher: | Oxford University Press (OUP): Policy P - Oxford Open Option A |
Refereed: | Yes |
Identification Number: | 10.1111/j.1365-2966.2011.20282.x |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:108468 |