Abundances of the Elements in Sharp‐lined Early‐Type Stars fromIUEHigh‐Dispersion Spectrograms. II. The Nitrogen Deficiency in Mercury‐Manganese Stars
Open Access
- 20 October 1999
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 524 (2) , 974-982
- https://doi.org/10.1086/307815
Abstract
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.Keywords
This publication has 20 references indexed in Scilit:
- The Abundances of the Elements in Sharp-lined Early-Type Stars from IUE High-Dispersion Spectrograms. I. Cr, Mn, Fe, Ni, and COThe Astrophysical Journal, 1993
- Elemental abundance analyses with DAO spectrograms - X. The mercury-manganese stars 1 Bootis, Herculis and HR 7361Monthly Notices of the Royal Astronomical Society, 1992
- Elemental abundance analyses with DAO spectrograms - VII. The late normal B stars Pi Ceti, 134 Tauri, 21 Aquilae, and Nu Capricorni and the use of Reticon spectraMonthly Notices of the Royal Astronomical Society, 1991
- Elemental abundance analyses with coadded DAO spectrograms - VI. The mercury-manganese stars Nu Cancri, Iota Coronae Borealis and HR 8349Monthly Notices of the Royal Astronomical Society, 1989
- Abundances of the elements: Meteoritic and solarGeochimica et Cosmochimica Acta, 1989
- Elemental abundance analyses with coadded DAO spectrograms – IV. Revision of previous analysesMonthly Notices of the Royal Astronomical Society, 1988
- Elemental abundance analyses with coadded Dominion Astrophysical Observatory spectrograms - III. The superficially normal standard stars Theta Leonis, Tau Herculis and Omicron PegasiMonthly Notices of the Royal Astronomical Society, 1988
- Elemental abundance analyses with coadded Dominion Astrophysical Observatory spectrograms – II. The mercury–manganese stars 53 Tauri, Mu Leporis and Kappa CancriMonthly Notices of the Royal Astronomical Society, 1987
- Theoretical oscillator strengths for the resonance transitions in the Zni isoelectronic sequencePhysical Review A, 1978
- Transition probabilities for vacuum ultraviolet lines of N I through N IVJournal of Quantitative Spectroscopy and Radiative Transfer, 1974