Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...90..437p&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 90, no. 3, Nov. 1991, p. 437-450. Research supported by Depa
Astronomy and Astrophysics
Astrophysics
20
Chromosphere, Dwarf Stars, Late Stars, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, H Alpha Line, High Resolution, Visible Spectrum
Scientific paper
High resolution H-alpha absorption- and emission-line profiles are reported for 11 stars of spectral types ranging from K5V to M3V, and the profiles of NaI(D), HeI(5876A), and CaII(IR) are given for portions of the sample. The observations were taken with the Qubes spectrograph, and the data are reduced by comparing the spectral data with observations of bright K giants of known radial velocity. Emission characterized by a strong blue H-alpha wing is reported for the active dMe stars, and the dMe G1616.2 demonstrates evidence of binarity in three separate lines. Chromospheric lines in absorption are identified in the remaining sources, and differences between the present and previously observed values are elaborated. The differences, particularly in H-alpha, are concluded to indicate intrinsic variability in the stars by either filling-in of absorption lines or by significant changes in the photosphere and chromosphere.
Byrne Brendan P.
Houdebine E. R.
Panagi Peter M.
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