NR is a Jansky Fellow of the National Radio Astronomy Observatory (NRAO). The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
An H I shell-like structure associated with nova V458 Vulpeculae?
Article first published online: 26 SEP 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society: Letters
Volume 427, Issue 1, pages L55–L59, November 2012
How to Cite
Roy, N., Kantharia, N. G., Eyres, S. P. S., Anupama, G. C., Bode, M. F., Prabhu, T. P. and O’Brien, T. J. (2012), An H I shell-like structure associated with nova V458 Vulpeculae?. Monthly Notices of the Royal Astronomical Society: Letters, 427: L55–L59. doi: 10.1111/j.1745-3933.2012.01344.x
- Issue published online: 7 NOV 2012
- Article first published online: 26 SEP 2012
- Accepted 2012 September 3. Received 2012 September 3; in original form 2012 July 24
- stars: individual: V458 Vul;
- novae, cataclysmic variables;
- ISM: general;
- radio lines: ISM
We report the radio detection of a shell-like H i structure in proximity to, and probably associated with, the nova V458 Vul. High spectral resolution observation with the Giant Metrewave Radio Telescope has made it possible to study the detailed kinematics of this broken and expanding shell. Unlike the diffuse Galactic H i emission, this is a single-velocity component emission with significant clumping at ∼0.5 arcmin scales. The observed narrow-line width of ∼5 km s−1 suggests that the shell consists of mostly cold gas. Assuming a distance of 13 kpc to the system, as quoted in the literature, the estimated H i mass of the nebula is about 25 M⊙. However, there are some indications that the system is closer than 13 kpc. If there is a physical association of the H i structure and the nova system, the asymmetric morphology and the off-centred stellar system indicate past strong interaction of the mass loss in the asymptotic giant branch phase with the surrounding interstellar medium. So far, this is the second example, after GK Per, of a large H i structure associated with a classical nova.