Infrared spectroscopy of Nova Cassiopeiae 1993 - I. The pre-dust phase

Details Infrared spectroscopy of Nova Cassiopeiae 1993 - I. The pre-dust phase Infrared spectroscopy of Nova Cassiopeiae 1993 - I. The pre-dust phase

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.282.1049e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 3, pp. 1049-1058.

Astronomy and Astrophysics

Astronomy

31

Circumstellar Matter, Stars: Individual: Nova Cas (V705 Cas), Novae, Cataclysmic Variables, Infrared: Stars

Scientific paper

We present infrared spectroscopy of Nova Cassiopeiae 1993 (V705 Cas) in the period before dust formation. We find strong emission in the first-overtone CO bands before the nova reached maximum light - the earliest detection of a molecule in a nova. Our observations suggest the presence of a relatively cool (<~4500 K), neutral zone in the ejecta, as required by chemical modelling of nova winds. CO formation is likely to have been dominated by the H_2 route rather than by direct radiative association of C and O. We suggest that radiative cooling of the ejected material by CO could play a major role in the grain formation process.

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