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Astron. Astrophys. 348, 475-478 (1999)

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Indications for the presence of a postmaximum wind of nova V1500 Cyg

M. Friedjung 1, J. Mikoajewska 2 and M. Mikoajewski 3

1 Institut d'Astrophysique, 98 bis Boulevard Arago, F-75014 Paris, France
2 Copernicus Astronomical Center, Bartycka 18, PL-00716 Warsaw, Poland
3 Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toru, Poland

Received 1 April 1999 / Accepted 16 June 1999

Abstract

We have studied spectra of nova V1500 Cyg (1975) shortly after its optical maximum. We find that the very wide red wing of the H[FORMULA] plus Ca II H line blend in emission, which was invisible at maximum, appeared a few hours later. What was according to Duerbeck & Wolf (1977) an extremely blue shifted absorption component of H[FORMULA] was also seen soon after. These observations can be understood by the presence of a continuously ejected high velocity wind, which became visible during the time of these observations. Somewhat later observations by other observers indicating emission line narrowing, can then be understood as due to a weakening of the wind at such times. The significance of the position of the blue edge of the main absorption component of H[FORMULA] and H[FORMULA] is also discussed in relation to the region where this absorption is produced.

Key words: line: profiles – stars: individual: V1500 Cyg – stars: novae, cataclysmic variables

Send offprint requests to: friedjung@iap.fr

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© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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