On the nature of 623+71 - A cataclysmic binary surrounded by a bow-shock-like emission nebula

Details On the nature of 623+71 - A cataclysmic binary surrounded by a bow-shock-like emission nebula On the nature of 623+71 - A cataclysmic binary surrounded by a bow-shock-like emission nebula

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...181..373k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 181, no. 2, July 1987, p. 373-377.

Astronomy and Astrophysics

Astrophysics

23

Astronomical Spectroscopy, Binary Stars, Planetary Nebulae, Stellar Envelopes, Bow Waves, Charge Coupled Devices, Interstellar Matter, Novae, Shock Waves, Stellar Evolution

Scientific paper

Direct CCD images and long-slit spectrograms of the peculiar system 623+71 have been obtained. 623+71 is a cataclysmic binary surrounded by a faint emission nebula which has a bow-shocklike structure. The dimensions of the nebula are about 105 arcsec both in the east-west and south-north directions. Electron densities in the nebula are between 100 and 250/cu cm. Emission line ratios show that shock wave heating and photoionization contribute to the excitation of the nebula. The observations do not support an interpretation of 623+71 as an old nova shell which has been ejected during an eruption some time ago. A planetary nebula nature would have important implications for the evolution of cataclysmic binaries. Evidence for such a nature is the strong morphological similarity with the peculiar planetary nebula Abell 35. A third explanation is that the nebula was formed by an interaction of a stellar wind with the surrounding interstellar medium. Stellar winds of cataclysmic binaries during active phases would be strong enough to form such an interstellar bubble.

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