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Astron. Astrophys. 325, 1083-1087

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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


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 HFORMULA and HFORMULA (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 HFORMULA and HFORMULA 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

© European Southern Observatory (ESO) 1997

Online publication: September 9, 1997
Last change: April 28, 1998