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

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263...71s&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 71-74

Astronomy and Astrophysics

Astrophysics

2

Chromosphere, Iue, Magnesium, Stellar Composition, Stellar Spectra, Absorption Spectra, Abundance, Atmospheric Chemistry

Scientific paper

The 1985 microfiche edition of the low-dispersion IUE spectra has been searched for emission in the Mg II h,k resonance lines of peculiar A-type stars (Ap, Am, λ Boo). All published spectra show the Mg II h,k lines in absorption. The absence of emission is confirmed by comparison with 53 high-dispersion spectra available from the IUE archives. Moreover, high-dispersion spectra reveal no sign of a chromosphere for three Ap stars for which weak X-ray emission has been reported.

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