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arXiv:0706.0054 (astro-ph)
[Submitted on 1 Jun 2007]

Title:Evidence for ablated flows in the shell of nova DQ Her

Authors:N. M. H. Vaytet, T. J. O'Brien, A. P. Rushton (Jodrell Bank Observatory, School of Physics and Astronomy, The University of Manchester, Macclesfield, Cheshire, UK)
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Abstract: High-resolution longslit Halpha spectra of the shell of the old nova DQ Her have been obtained with the William Herschel Telescope using the ISIS spectrograph. An equatorial expansion velocity of 370+/-14 km/s is derived from the spectra which, in conjunction with a narrowband Halpha image of the remnant, allows a distance estimate of 525+/-28 pc. An equatorial ring which exhibits enhanced [NII] emission has also been detected and the inclination angle of the shell is found to be 86.8+/-0.2 degrees with respect to the line of sight. The spectra also reveal tails extending from the clumps in the shell, which have a radial velocity increasing along their length. This suggests the presence of a stellar wind, collimated in the polar direction, which ablates fragments of material from the clumps and accelerates them into its stream up to a terminal velocity of order 800-900 km/s.
Comments: 7 pages, 6 figures
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0054 [astro-ph]
  (or arXiv:0706.0054v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0054
Related DOI: https://doi.org/10.1111/j.1365-2966.2007.12057.x

Submission history

From: Neil M. H. Vaytet [view email]
[v1] Fri, 1 Jun 2007 14:06:29 UTC (478 KB)
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