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1981•Monthly Notices of the Royal Astronomical SocietyRequires access

Ultraviolet spectra of dwarf solar neighbourhood stars - I

C. J. Butler, P. B. Byrne, A. D. Andrews, J. G. Doyle

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Abstract

Short-wavelength IUE spectra of three nearby M-type dwarfs are presented. Two of these stars, Gliese 867 A and AU Mic, are active UV Ceti flare stars and their UV spectra exhibit strong emission lines, characteristic of active chromospheres. The third star, Gliese 825, is a low-activity flare star and its spectrum reveals no chromospheric lines. A strong UV continuum exists in one of the spectra of Gliese 867 A and it is deduced that a flare took place during the exposure. A spectrum of the flare light is extracted and compared with the predictions of various flare models.

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What this paper is about

Short-wavelength IUE spectra of three nearby M-type dwarfs are presented. Two of these stars, Gliese 867 A and AU Mic, are active UV Ceti flare stars and their UV spectra exhibit strong emission lines, characteristic of active chromospheres. The third star, Gliese 825, is a low-activity flare star and its spectrum reveals no chromospheric lines. A strong UV continuum exists in one of the spectra of Gliese 867 A and it is deduced that a flare took place during the exposure. A spectrum of the flare light is extracted and compared with the predictions of various flare models.

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Available abstract

Short-wavelength IUE spectra of three nearby M-type dwarfs are presented. Two of these stars, Gliese 867 A and AU Mic, are active UV Ceti flare stars and their UV spectra exhibit strong emission lines, characteristic of active chromospheres. The third star, Gliese 825, is a low-activity flare star and its spectrum reveals no chromospheric lines. A strong UV continuum exists in one of the spectra of Gliese 867 A and it is deduced that a flare took place during the exposure. A spectrum of the flare light is extracted and compared with the predictions of various flare models.

Key concepts: Physics, Astrophysics, Flare star, Stars, Flare, Spectral line, Ultraviolet, Astronomy

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