Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..299f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 299-302.
Astronomy and Astrophysics
Astrophysics
5
Chromosphere, Dwarf Stars, Late Stars, Stellar Magnitude, Astronomical Spectroscopy, Emission Spectra, H Alpha Line, Spectral Line Width, Stellar Mass
Scientific paper
The preliminary results of a program to detect chromospheric Ca II K line emission in the faintest dwarf stars yet observed at this wavelength using high spectral resolution are reported. The star LHS 429 (VB 8; dM7e) exhibits K line emission in addition to H-alpha emission while LHS 2 (dM5-5.5) shows K line emission although no apparent H-alpha feature was seen in a spectrum obtained during the course of an earlier study by Giampapa and Liebert. A further seven stars observed did not exhibit any apparent feature at the position of the K line. The upper limits estimated for the K line surface flux in the case of the nondetections are still consistent with these stars having chromospheres characterized by a level of K line emission similar to that of LHS 2. The trend of the measured K line widths with absolute visual magnitude is qualitatively in accord with that expected from the Wilson-Bappu effect.
Fleming Thomas Anthony
Giampapa Mark S.
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