Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..891h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 891-899. Research supported by Sigma Xi.
Astronomy and Astrophysics
Astronomy
43
Chromosphere, Dwarf Stars, H Alpha Line, K Stars, M Stars, Stellar Activity, Absorption Spectra, Bolometers, Spectral Line Width, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
H-alpha photometry of 118 K and M dwarfs are presented, with H-alpha equivalent width measures accurate to about 0.05 A. The data are combined with the spectroscopic surveys of Stauffer and Hartmann (1986) and Fleming et al. (1988) to study the main features of the chromospheric activity versus mass relation for low-mass stars. An upper bound to the H-alpha equivalent width is found to be a function of the mass relation (R-I). H-alpha luminosities and surface fluxes are calculated for active stars, showing that both quantities generally decline with R-I. The upper bound to the fraction of a star's bolometric luminosity, however, is independent of R-I. The results suggest that the chromospheres of most dMe stars with R-I less than 1.1 are in an activity-saturated state. Also, H-alpha variability, probably due to flares, is detected in several stars.
Herbst William
Miller Jeffrey R.
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