On the problem of detection of the circumstellar clouds from 2800 MgII observations |
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Authors: | G A Gurzadyan |
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Institution: | (1) Polytechnic Institute, Erevan, Armenian SSR, U.S.S.R. |
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Abstract: | A new method for the detection of the circumstellar clouds around the hot stars of O-B classes is developed. The method is based on the fact, connected with the large dispersion in the observed equivalent widths,W
*(2800 MgII) of non-stellar origin, for a selected group of stars withE(B-V)=0. The separation of observed magnitudes ofW(2800) in two components interstellarW
i, and circumstellarW
c is realised. It is shown that the circumstellar clouds really existed around 90% of hot stars analysed in the present paper (total number of stars 46, Table II). In 30% cases of hot stars circumstellar clouds are very powerful (the radii are less than 1pc, the masses less than 1 solar mass). The usual model for interstellar medium seems to be unacceptable for the system hot star+circumstellar cloud. |
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