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Astron. Astrophys. 361, 901-912 (2000)


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Strong spectral variability in NGC 7603 over 20 years *

W. Kollatschny 1,2, K. Bischoff 1 and M. Dietrich 3

1 Universitäts-Sternwarte Göttingen, Geismarlandstrasse 11, 37083 Göttingen, Germany
2 Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712, USA
3 Department of Astronomy, University of Florida, 211 Bryant Space Center, Gainesville, FL 32611-2055, USA

Received 14 June 2000 / Accepted 21 July 2000

Abstract

We present results of a long-term optical variability campaign on the Seyfert 1 galaxy NGC 7603 over a period of nearly 20 years. The optical continuum and the Balmer and Helium lines varied by a factor of 5 to 10 in this broad-line Seyfert 1 galaxy. Furthermore, it is remarkable that the optical FeII line blends varied with the same amplitude as the H[FORMULA] and HeI lines. During the first half of the campaign (until 1990) there was a strong correlation between Balmer decrement variations, H[FORMULA] intensity variations and emission line asymmetry. This behaviour changed afterwards when the H[FORMULA] line intensity was higher than on average.

Key words: line: profiles – galaxies: individual: NGC 7603 – galaxies: Seyfert

* Based on observations taken at the German-Spanish Astronomical Centre Calar Alto, ESO, and McDonald Observatory

Send offprint requests to: W. Kollatschny (wkollat@uni-sw.gwdg.de)

© European Southern Observatory (ESO) 2000

Online publication: October 10, 2000

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