Searching for chromospheric Lyman-α emission in A-F stars from IUE high resolution spectra.

Details Searching for chromospheric Lyman-α emission in A-F stars from IUE high resolution spectra. Searching for chromospheric Lyman-α emission in A-F stars from IUE high resolution spectra.

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..521m&link_type=abstract

Astronomy and Astrophysics, v.317, p.521-531

Astronomy and Astrophysics

Astrophysics

9

Line: Profiles, Stars: Chromospheres, Hr Diagram, Interstellar Medium: Atoms, Ultraviolet: Stars

Scientific paper

With the aim of locating the boundary for the onset of chromospheric emission in the H-R diagram we have undertaken a spectroscopic study of the hydrogen Ly-α, using the IUE short wavelength spectrograph in the high resolution mode. We report here on the analysis of IUE spectra of 11 A-F type stars. We have detected Ly-α emission in stars as early as A7 (B-V=0.19), establishing a new limit for the presence of chromospheres. The constant or the slowly decreasing trend of the Ly-α flux for B-V<0.5 is related to the decreasing trend of X-ray emission in the same spectral type region. From the interstellar absorption feature affecting the stellar Ly-α emission, the Hi column density is estimated.

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