Heavy element abundances in AP stars from ultraviolet data. I. The bright reference stars. cap alpha. Lyrae and. cap alpha. Canis Majoris A
Journal Article
·
· Astrophys. J.; (United States)
- Crimean Astrophysical Observatory, USSR
Curve-of-growth andlysis is used to derive chemical abundances in ..cap alpha.. Lyr and ..cap alpha.. CMa, based on ultraviolet spectra obtained with Copernicus. This analysis is the first step in a program to study the abundances of the heavy elements mercury and platinum and the short-lived element technetium in the atmospheres of Ap and Am stars. Ultraviolet Fe II lines are used to establish the curves of growth for ..cap alpha.. Lyr and ..cap alpha.. CMa A, and abundances of a variety of elements, along with upper limits on Hg, Pt, and Tc, are derived. In cases where previous studies based on visual spectra have included elements in common with the present analysis, the agreement is good within the known uncertainties. One new element, cadmium, is observed for these two stars. The upper limits on Pt and Hg, as well as Tc, show that these elements are probably not enhanced in ..cap alpha.. CMa A by more than about one order of magnitude. 2 figures, 4 tables.
- OSTI ID:
- 6774954
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 219:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE ABUNDANCE OF BERYLLIUM IN FOUR STARS OF TYPE A
Observations of local interstellar Mg I and Mg II
Boron and beryllium in gamma Geminorum
Journal Article
·
Tue Feb 28 23:00:00 EST 1961
· Astrophysical Journal (U.S.)
·
OSTI ID:4050461
Observations of local interstellar Mg I and Mg II
Technical Report
·
Wed Oct 31 23:00:00 EST 1984
·
OSTI ID:5774701
Boron and beryllium in gamma Geminorum
Journal Article
·
Tue Mar 31 23:00:00 EST 1981
· Astrophys. J.; (United States)
·
OSTI ID:6452262