Search for chromospheric indicators in A dwarf stars

Details Search for chromospheric indicators in A dwarf stars Search for chromospheric indicators in A dwarf stars

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..207f&link_type=abstract

In ESA Fourth European IUE Conf. p 207-210 (SEE N84-35135 24-88)

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3

A Stars, Chromosphere, Dwarf Stars, Iue, Stellar Spectra, Ultraviolet Spectra

Scientific paper

An IUE observational program, using the high resolution mode, with the aim to search for chromospheric indicators in A normal stars was started in 1982. The classical chromospheric indicators are core reversals in collisional dominated lines as C II (1335 Å), Si II (1308 Å) and Mg II (2800 Å) lines. The analysis of the sample of 16 stars observed (from A0 V to A8 IV) do not show any line core reversal on the UV high resolution spectra. The preliminary result that emerges with this small sample of A stars, supported by other results in the literature, is that chromospheres are probably absent in A type IV - V stars.

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