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Astron. Astrophys. 355, L9-L12 (2000)


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Letter to the Editor

Early spectroscopic observations of Nova (V1494) Aquilae 1999 No.2 *

L.L. Kiss 1 and J.R. Thomson 2

1 University of Szeged, Department of Experimental Physics and Astronomical Observatory, Szeged, Dóm tér 9., 6720 Hungary
2 University of Toronto, David Dunlap Observatory, Richmond Hill, Canada

Received 21 December 1999 / Accepted 28 January 2000

Abstract

Low- and medium resolution spectra of the fast nova, Nova (V1494) Aql 1999 No.2 obtained approximately 6, 7, 19 and 28 days after the maximum brightness are presented and discussed. The spectrum covering the whole optical range at day 6 shows the principal plus diffuse-enhanced spectrum. The presence of strong Fe II multiplets with P-Cyg profiles suggest that V1494 Aql belongs to the "Fe II" class defined by Williams (1992). The medium-resolution profiles ([FORMULA]) of the H[FORMULA] and H[FORMULA] lines shows well-defined sharp absorption features with the same radial velocities, while the H[FORMULA] split into two distinct emission peaks in the last two spectra ([FORMULA]=19 and 28 days). The observed behaviour suggests an expanding equatorial ring with possible small-scale clumpiness in the nova shell. The visual lightcurve is used to deduce [FORMULA] by the maximum magnitude versus rate of decline relationship. The resulting parameters are: [FORMULA] days, [FORMULA]=16[FORMULA] days, [FORMULA] mag. Adopting this value, a distance d=3.6[FORMULA]0.3 kpc is determined.

Key words: stars: novae, cataclysmic variables – stars: individual: V1494 Aql

* Based on the data obtained at the David Dunlap Observatory, University of Toronto

Send offprint requests to: l.kiss@physx.u-szeged.hu

© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000

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