The symbiotic star CH Cygni. II. The broad Ly alpha emission line explained by shocks

Details The symbiotic star CH Cygni. II. The broad Ly alpha emission line explained by shocks The symbiotic star CH Cygni. II. The broad Ly alpha emission line explained by shocks

2008-07-09

arxiv.org/abs/0807.1473v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted for publication in A&A on 7th April 2008

Scientific paper

10.1051/0004-6361/20079283

Context. In 1985, at the end of the active phase 1977-1986, a broad (4000 km/s) Ly alpha line appeared in the symbiotic system CH Cygni that had never been observed previously. Aims. In this work we investigate the origin of this anomalous broad Ly alpha line. Methods. We suggest a new interpretation of the broad Ly alpha based on the theory of charge transfer reactions between ambient hydrogen atoms and post-shock protons at a strong shock front. Results. We have found that the broad Ly alpha line originated from the blast wave created by the outburst, while the contemporary optical and UV lines arose from the nebula downstream of the expanding shock in the colliding wind scenario.

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