Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234p..41h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 15, 1988, p. 41P-49P.
Astronomy and Astrophysics
Astronomy
23
Fine Structure, H Alpha Line, H Beta Line, Red Shift, Stellar Envelopes, Supernova 1987A, Cygnus Constellation, Radial Velocity, Stellar Spectra
Scientific paper
The authors present flux-calibrated spectra of the Hα region for SN 1987A at 3 Å resolution, covering the period 1987 February 25 to June 14, the first 111 days of SN 1987A. They find that Hα in SN 1987A shows an undisturbed P Cyg-type profile until March 15, superimposed by variable fine-structure after that date, developing within a few days into a blueshifted peak-like flux excess at -5000 km s-1 and a redshifted flux deficiency at +4400 km s-1. Both features move towards smaller radial velocity with time. The observed line profile structure is very likely to be caused by scattered Hα photons. Similar fine-structure is also observed at Na I-D and at Paschen-α. The authors discuss their observations in terms of possible relations to speckle observations ("mystery spot") and of models involving a jet or interactions with surrounding pre-existing material.
Dachs Joachim
Hanuschik Reinhard W.
Thimm Guido
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