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Astron. Astrophys. 325, 1083-1087 (1997)

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The luminosity of the H-emission envelopes of variable Is(A)-type stars

A.F. Pugach and G.U. Kovalchuk

Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 252650 Kyiv, Golosiiv, Ukraine

Received 30 April 1996 / Accepted 20 November 1996

Abstract

We present the results of the analysis of the emission spectra of variable Is(A)-type stars. Sixteen stars have been observed in 1988-1992 at the 6-m telescope of Special Astrophysical Observaroty, Russian Academy of Sciences (SAO RAS) with the middle-resolution (R [FORMULA] 3000) echelle spectrograph "Zebra". Equivalent widths of the [FORMULA] and [FORMULA] (if available) emission components were obtained, the underlying profile of the corresponding absorption lines were taken into account. The luminosities of the emission envelopes in the [FORMULA] and [FORMULA] lines were then calculated. The main result of the investigation is that the luminosity of the emission envelope appears to depend on the effective temperature of the star.

Key words: stars: early type – stars: emission line – stars: variables: other – stars: pre main-sequence

Send offprint requests to: A.F. Pugach e-mail: pugach@mao.kiev.ua

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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