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Astron. Astrophys. 333, 159-162 (1998)

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Spectrophotometry of type Ib/c SN 1997X: He I lines near maximum light

U. Munari 1, R. Barbon 2, A. Piemonte 3, L. Tomasella 2 and M. Rejkuba 3

1 Osservatorio Astronomico di Padova, Sede di Asiago, I-36012 Asiago (VI), Italy
2 Osservatorio Astrofisico di Asiago, Università di Padova, I-36012 Asiago (VI), Italy
3 c/o Osservatorio Astrofisico di Asiago, Università di Padova, I-36012 Asiago (VI), Italy

Received 17 November 1997 / Accepted 2 January 1998

Abstract

Low resolution B&C+CCD (range 3600 Å - 1.0 µm) and high resolution Echelle+CCD (range 5800-8100 Å) spectrophotometry of type Ib/c SN 1997X near maximum light is presented and discussed. The supernova is notheworthy in having presented absorption lines of He I at early phases (at an expansion velocity of 11000 km sec-1). From the interstellar NaI D lines a reddening of E [FORMULA] =0.18 [FORMULA] 0.02 mag has been derived, which arises in the host galaxy. From the emission lines of the underlying H II region, a density of [FORMULA] and a velocity of [FORMULA] =1098 [FORMULA] 3 km sec-1 are obtained.

Key words: supernovae: individual: SN1997X – dust, extinction – galaxies: individual: NGC 4691

Send offprint requests to: R.Barbon

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© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998
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