Non-LTE gallium abundance in HgMn stars

Details Non-LTE gallium abundance in HgMn stars Non-LTE gallium abundance in HgMn stars

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...373..987z&link_type=abstract

Astronomy and Astrophysics, v.373, p.987-992 (2001)

Astronomy and Astrophysics

Astrophysics

2

Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar

Scientific paper

We present, for the first time, the Non-LTE gallium equivalent widths for the most prominent gallium transitions as identified in real spectra and in (hot) mercury-manganese star. The common feature of the departure coefficients is to decrease near the stellar surface, the collision rates are dominant in many cases and the Non-LTE equivalent widths are generally smaller. In particular, the abundance difference as derived from UV and visual lines is reduced. The photoionization cross sections were computed by means of standard R-matrix formalism. The gallium cross-sections are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/373/987

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