CA ii EMISSION VARIABILITY IN BY DRACONIS

Photoelectric spectrophotometry of the Can K emission line in the flare star BY Dra during 1975 shows no evidence for variability over the 3ḍ8 rotation period. Apparently the K-line emission is produced uniformly over the stellar surface, and is not localized in plage regions. Concurrent variations...

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Bibliographic Details
Published inPublications of the Astronomical Society of the Pacific Vol. 89; no. 527; pp. 69 - 70
Main Authors BOPP, BERNARD W., FERLAND, GARY
Format Journal Article
LanguageEnglish
Published The Astronomical Society of the Pacific 01.02.1977
Subjects
Astronomical photometry
Emission line stars
Emission spectra
Optical filters
Plages
Spectrophotometry
Variable stars
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Summary:Photoelectric spectrophotometry of the Can K emission line in the flare star BY Dra during 1975 shows no evidence for variability over the 3ḍ8 rotation period. Apparently the K-line emission is produced uniformly over the stellar surface, and is not localized in plage regions. Concurrent variations in (B— V) and (b— y) confirm that the color changes seen over the photometric cycle are a continuum effect, rather than a result of varying emission line flux.
ISSN:0004-6280
1538-3873