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2004PASP..116..554W - Publ. Astron. Soc. Pac., 116, 554-557 (2004/June-0)

Near-ultraviolet spectra of nine M dwarf stars, or a second effort to find optical coronal lines in M dwarf stars.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Stars: Activity - Stars: Coronae - Stars: Flare - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 20

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