Abundances of the elements in sharp-lined early-type stars from IUE high-dispersion spectrograms.: II.: The nitrogen deficiency in mercury-manganese stars

被引：14

作者：

Roby, SW ^{[1
]}

Leckrone, DS

Adelman, SJ

机构：

[1] SUNY Coll Oswego, Dept Earth Sci, Oswego, NY 13126 USA

[2] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA

[3] The Citadel, Dept Phys, Charleston, SC 29409 USA

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 524卷 / 02期

关键词：

stars : abundances; stars : early-type; stars : peculiar; ultraviolet : stars;

D O I：

10.1086/307815

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We determine nitrogen abundances from co-added IUE high-dispersion SWP spectrograms of four HgMn stars and five normal or superficially normal main-sequence B and A stars. We find N deficiencies in the HgMn stars greater than previously reported (depletion factors of 135-400 relative to the Sun). N abundance discrepancies from UV and IR studies of normal stars are discussed in light of possible non-LTE effects. Our data set for our sample of HgMn stars (observed with a consistent strategy to maximize the benefits of co-additions) is an improvement over the single or few images previously used to derive N abundances for most of these stars.

引用

页码：974 / 982

页数：9