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Astron. Astrophys. 345, 592-596 (1999)

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Early-time spectroscopic observations of SN 1998aq in NGC 3982

J. Vinkó 1,2, L.L. Kiss 3, J. Thomson 4, G. Frész 1, W. Lu 4, G. Kaszás 1 and Z. Balog 1

1 Department of Optics and Quantum Electronics, JATE University, Szeged, POB 406, H-6701 Hungary
2 Research Group on Laser Physics of the Hungarian Academy of Sciences
3 Department of Experimental Physics, JATE University, Szeged, Dóm tér 9. H-6720 Hungary
4 David Dunlap Observatory, University of Toronto, Box 360, Richmond Hill, Ontario L4C 4Y6, Canada

Received 21 October 1998 / Accepted 8 February 1999

Abstract

Medium resolution spectroscopic observations of SN 1998aq made in April - May, 1998, are presented. We confirm its Type Ia classification based on the prominent Si II [FORMULA]6355 line and other features similar to SNe Ia. No significant sign of hydrogen Balmer-alpha line was seen in high-resolution spectra taken at 8 days before maximum. Preliminary estimate of reddening and distance modulus, based on the correlation between the line depth ratio of two Si II features around 6000 Å and BVRI light curves of Type Ia SNe (Riess et al., 1998), is presented. Moreover, [FORMULA] emission from the core of the Seyfert 2 type host galaxy NGC 3982 has also been detected.

Key words: galaxies: Seyfert – stars: supernovae: individual: SN 1998aq – techniques: spectroscopic

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

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© European Southern Observatory (ESO) 1999

Online publication: April 19, 1999
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