Element identification in five Ap stars.
We have examined 2 A spectra of p CrB, 73 Dra, 78 Vir, HR 4816, and HR 4072 for the presence of some 74 elements. The technique combines traditional line-identification methods with a Monte Carlo analysis of wavelength coincidences. The identifications are divided into three categories: definite, good, and possible. A majority of the discussion is devoted to the latter category. In many instances, the lines in question arise from more than 10 eV so that a positive identification alone would imply a large abundance excess. Elements in this category which may be present in one or more of the five stars are Al, S, Kr, and a few others. A high significance level was found for Pt in HR 4072. The statistical results for Pt and U were negative or weak in all other cases but the tracings provide some evidence for the presence of these elements. No evidence was found for Pm, or any of the transuranic elements. Subject headings: abundances, stellar - line identifications - peculiar A stars
The Astrophysical Journal
- Pub Date:
- December 1974