Hydrogen in the Spectrum of SN 1990M: No More?

Details Hydrogen in the Spectrum of SN 1990M: No More? Hydrogen in the Spectrum of SN 1990M: No More?

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459l..23d&link_type=abstract

Astrophysical Journal Letters v.459, p.L23

Astronomy and Astrophysics

Astronomy

7

Galaxies: Individual Ngc Number: Ngc 5493, Stars: Supernovae: Individual Alphanumeric: Sn 1990M

Scientific paper

The detection of hydrogen in the spectra of Type Ia supernovae is matter of recurrent debates, in that it could provide an important constraint on the nature of the progenitors. Currently, the most "robust" evidence for hydrogen in spectra of Type Ia supernovae is given by an H alpha absorption line measured by Polcaro & Viotti in an early stage spectrum of SN 1990M. Through the analysis of an unpublished spectrum of this object, obtained with the 1.52 m ESO telescope one day after the SN discovery, we show that the claimed H alpha detection is originated by an observational bias. Once the subtraction of the parent galaxy background is properly done, no evidence for an H alpha absorption is found in the spectrum of SN 1990M. We set a rough upper limit of to the hydrogen abundance in the supernova atmosphere of H/Si <= 2 x 10-6.

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