Search for chromospheric MG II emission in Ap-type stars

Details Search for chromospheric MG II emission in Ap-type stars Search for chromospheric MG II emission in Ap-type stars

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..186s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 186-190.

Astronomy and Astrophysics

Astrophysics

4

A Stars, Chromosphere, Magnesium, Peculiar Stars, Stellar Atmospheres, Stellar Composition, Emission Spectra, F Stars, Magnetohydrodynamics, Main Sequence Stars, Stellar Oscillations, Stellar Spectra

Scientific paper

Observations of the Mg II h and k line resonance doublet in the spectra of 10 of the latest Ap-type stars show no sign of emission cores in the broad absorption lines. Thus, the Mg II lines give no evidence for chromospheric activity in peculiar A-type stars; the present observations sharpen the boarder between active and non-active stars. This fact is discussed in connection with the problem of the onset of chromospheres and transition zones in A- and F-type main-sequence stars. Special attention is paid to the question of Alfvenic heating in the atmospheres of rapidly oscillating Ap-type stars.

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