Evidence for ablated flows in the shell of nova DQ Her

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.

7 pages, 6 figures

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• Hubble Space Telescope imaging and ground-based spectroscopy of old nova shells - I. FH Ser, V533 Her, BT Mon, DK Lac, V476 Cyg
• The Chandra Observation of the Shell of Nova Persei 1901 (GK Persei): Detection of localized Non-thermal X-ray Emission from a Miniature Supernova Remnant
• The Origin of Soft X-rays in DQ Herculis
• The tails in the Helix Nebula NGC 7293
• A multiwavelength study of the remnant of nova GK Persei
• The Active Quiescence of HR Del (Nova Del 1967)

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• Angular Expansion of Nova Shells
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• Spin-resolved spectroscopy of the intermediate polar DQ Her
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• Two New Nova Shells associated with V4362 Sagittarii and DO Aquilae
• Extended X-ray emission from the classic nova DQ Her -- On the possible presence of a magnetized jet
• Spatio-kinematic models of five nova remnants: correlations between nova shell axial ratio, expansion velocity, and speed class
• Spectral Mapping of the Intermediate Polar DQ Herculis
• Unresolved X-ray emission in M31 and constraints on progenitors of Classical Novae
• Shock shaping? Nebular Spectroscopy of Nova V906 Carinae
• X-ray observations of the nova shell IPHASX J210204.7+471015
• A persistent bow shock in a diskless magnetised accreting white dwarf