Angular Expansion of Nova Shells

Abstract

Nova shells can provide us with important information on their distance, their interactions with the circumstellar and interstellar media, and the evolution in morphology of the ejecta. We have obtained narrow-band images of a sample of five nova shells, namely DQHer, FHSer, TAur, V476Cyg, and V533Her, with ages in the range from 50 to 130 years. These images have been compared with suitable available archival images to derive their angular expansion rates. We find that all the nova shells in our sample are still in the free expansion phase, which can be expected, as the mass of the ejecta is 7-45 times larger than the mass of the swept-up circumstellar medium. The nova shells will keep expanding freely for time periods up to a few hundred years, reducing their time dispersal into the interstellar medium.

8 pages, 2 figures, 3 tables. Accepted for publication in ApJ

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• Two New Nova Shells associated with V4362 Sagittarii and DO Aquilae
• On the Observability of Recurrent Nova Super-Remnants
• Extended X-ray emission from the classic nova DQ Her -- On the possible presence of a magnetized jet
• Chemistry and physical properties of the born-again planetary nebula HuBi 1
• QU Vul: An Integral Field Spectroscopy Case Study of a Nova Shell
• The precessing jets of classical nova YZ Reticuli
• Spatio-kinematic models of five nova remnants: correlations between nova shell axial ratio, expansion velocity, and speed class
• Confirmation of the planetary nebula nature of HaTr 5. Not the remnant of Nova Sco 1437
• The peculiar ejecta of the nova V1425 Aquilae
• Morpho-kinematic modeling of the expanding ejecta of the extremely slow nova V1280 Scorpii
• VLT VIMOS Integral Field Spectroscopy of the nova remnant FH Ser
• MUSE observations of V1425 Aql reveal an arc-shaped nova shell
• X-ray observations of the nova shell IPHASX J210204.7+471015
• Challenging historical novae: AT Cnc (1645), Te-11 (483), and M22 (BC 48) revisited