Determination of physical characteristics of atmospheres of B- and A-stars by the Balmer indices method.
Spectra (28 Å/mm) have been obtained with the telescopes BTA and Zeiss-600 and spectrophotometry has been performed for 57 bright stars of B and A spectral classes. With the help of a new method of Balmer indices effective temperatures Te and gravities g in the atmospheres of these stars have been determined. The internal accuracy of the method is high, the effective temperature determinations agree with the calibration by Kopylov. Systematic discrepancy in lg g found by the method of Balmer indices (from the features of the continuous spectrum in the region of the Balmer jump),and from the equivalent widths of the first members of the Balmer series is revealed. Possible reasons for this discrepancy are discussed.
Astrofizicheskie Issledovaniia Izvestiya Spetsial'noj Astrofizicheskoj Observatorii
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