H-alpha absorption in the type-Ia supernova 1990M during its early phases

Details H-alpha absorption in the type-Ia supernova 1990M during its early phases H-alpha absorption in the type-Ia supernova 1990M during its early phases

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242l...9p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. L9-L11.

Astronomy and Astrophysics

Astrophysics

18

Absorption Spectra, H Alpha Line, Spectral Line Width, Supernovae, Astronomical Models, Astronomical Spectroscopy, Radial Velocity, Red Shift, Stellar Envelopes

Scientific paper

Red and blue spectrograms of SN 1990M in NGC 5493 obtained at the ESO 1.52 m telescope 1 to 4 days after the supernova discovery are analyzed. Besides the characteristic type-Ia SN features, a relatively broad absorption line was observed at 6619 A which has been identified with H-alpha with the same redshift of NGC 5493. The line width and strength on June 16.9 are consistent with line formation in the neutral parts of an intense wind of a luminous star close to the supernova, and likely associated with it. Alternative models include absorption in the H-rich matter ejected during a common envelope phase.

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