Search for transition zone lines in early dwarf A stars

Details Search for transition zone lines in early dwarf A stars Search for transition zone lines in early dwarf A stars

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159..209f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 209-216.

Astronomy and Astrophysics

Astrophysics

5

A Stars, Dwarf Stars, Early Stars, Interstellar Matter, Stellar Spectra, Carbon, Helium, Iue, Line Spectra, Photosphere, Resonance Lines, Silicon

Scientific paper

The presence of hot external atmospheric layers in some A stars, demonstrated by the X-ray detections with the Einstein satellite, stimulated the search for optical counterparts, in particular, the search for the UV transition zone indicators like Si IV, C IV and He II lines. The observations of a sample of early dwarf A stars with IUE allows one to conclude that the features observed on regions of Si IV, C IV and He II lines may be explained by blends of metallic lines. In consequence, transition regions are probably not present or they have a very small thickness in dwarf A stars.

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