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Results of modeling the spectra of two supernovae SN 2008D and SN 2006ajrelated to the X-ray flash XRF 080109 and gamma-ray burst GRB / XRF 060218,respectively, are studied. The spectra were obtained with the 6-meter BTAtelescope of the Special Astrophysical Observatory of the Russian Academy ofSciences in 6.48 and 27.61 days after the explosion of SN 2008D, and in 2.55and 3.55 days after the explosion of SN 2006aj. The spectra were interpreted inthe Sobolev approximation with the SYNOW code. An assumption about the presenceof envelopes around the progenitor stars is confirmed by an agreement betweenthe velocities of lines interpreted as hydrogen and helium, and the empiricpower-law velocity drop with time for the envelopes of classic core-collapsesupernovae. Detection of a P Cyg profile of the H-beta line in the spectra ofoptical afterglows of GRBs can be a determinative argument in favor of thishypothesis.

astrophysical bulletin

Study of Envelope Velocity Evolution of Type Ib-c Core-Collapse  Supernovae from Observations of XRF 080109 / SN 2008D and GRB 060218 / SN  2006aj with BTA