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Near‐Ultraviolet Spectra of Nine M Dwarf Stars, or a Second Effort to Find Optical Coronal Lines in M Dwarf Stars

George Wallerstein and Sudhi Tyagi
Publications of the Astronomical Society of the Pacific
Vol. 116, No. 820 (June 2004), pp. 554-557
DOI: 10.1086/420981
Stable URL: http://www.jstor.org/stable/10.1086/420981
Page Count: 4
Subjects: Astronomy
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Abstract

ABSTRACT We have searched for optical coronal lines in the 3100–3700 Å region of eight M dwarf stars with rather low levels of activity. This brief survey supplements a similar search in 15 active stars published in 1991. No coronal lines could be identified. However, the emission spectra including lines of H i, He i, Ca ii, Ca i, Si i, and Fe i are described and illustrated. Radial velocities of the emission lines show no systematic differences from the stellar absorption lines. Coronae with temperatures similar to those in the solar corona seem to be rare among the M dwarfs, although at least one example has been found by Schmitt & Wichmann.

Notes and References

This item contains 12 references.

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