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Chromospheres of M Dwarf Stars with Incipient Hα Emission

Published online by Cambridge University Press:  25 April 2016

R. D. Robinson  and
L. E. Cram
R. D. Robinson
Affiliation:
Anglo-Australian Observatory
L. E. Cram
Affiliation:
University of Sydney
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Abstract

We present observations of Hα and CaII resonance lines in 4 stars having Hα features which place them intermediately between the non-(e) and (e) classifications of dK/dM stars. There is considerable variety in the shape of the Hα line, presumably due in part to differences in rotation rates. As expected, the energy fluxes in the CaII emission lines lie between those typical of non-(e) and (e) stars. There is some evidence (especially from the binary Gl 876A) that the energy fluxes in the CaII and Hα emission lines do not vary from star to star according to a simple proportionality. An intriguing result is the apparent detection of spatially displaced chromospheric emission in Gl 907.1 and Gl 890.

Type
Stellar
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 2 , 1989 , pp. 132 - 136
Copyright
Copyright © Astronomical Society of Australia 1989

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