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Astron. Astrophys. 331, 471-474 (1998)


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The variability of the broad component of the He II 4686 line in NGC 4151

L.S. Nazarova 1, 2, P.M. Gondhalekar 1, N.G. Bochkarev 2 and A.I. Shapovalova 3

1 Rutherford Appleton Laboratory, Chilton, OXON, OX11 0QX, UK
2 Astronomical Society, Sternberg Astronomical Institute, Universitetskij prosp.13, Moscow, 119899, Russia
3 Special Astrophysical Observatory, N. Arkhyz., Stavropolskii Krai, 357147, Russia

Received 27 February 1997 / Accepted 10 November 1997

Abstract

We present the results of the observations of NGC 4151 obtained from 1986 to 1990 with the TV scanner of the 6-meter telescope of the Special Astrophysical Observatory. Spectra averaged over periods of 2-3 months show changes in the asymmetry of the broad component of HeII [FORMULA] 4686 line over this observing period. The broad component of H [FORMULA] however does not show similar variations. We discuss the reasons which could be responsible for these observations.

Key words: galaxies: individual: NGC 4151 – galaxies: nuclei – galaxies: Seyfert

Send offprint requests to: P.M. Gondhalekar

© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998
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