The corona of the K5 giant &ggr; Dra, and its relation to the hybrid‐chromosphere stars
作者:
Alexander Brown,
Jeffrey L. Linsky,
Thomas R. Ayres,
期刊:
AIP Conference Proceedings
(AIP Available online 1994)
卷期:
Volume 313,
issue 1
页码: 36-40
ISSN:0094-243X
年代: 1994
DOI:10.1063/1.46691
出版商: AIP
数据来源: AIP
摘要:
Gamma Draconis is the first, normal, single late K giant located on the red side of the coronal ‘‘dividing line’’ known to show conclusive evidence for hot (∼105K) transition region (TR) and coronal plasma. We present ROSAT PSPC data and HST GHRS spectra of &ggr; Dra and describe the coronal and TR properties of this K5 III star. The high temperature emissions of &ggr; Dra are compared to those of a sample of hybrid‐chromosphere bright giants and supergiants. New PSPC detections of the K3 giant &agr; Hya and the G supergiant &bgr; Aqr are presented. Upper limits are found for the hybrid‐chromosphere stars &thgr; Her and &agr; Aqr. These new measurements extend the X‐ray to C IV flux‐flux relations to significantly lower activity levels.
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