THE ABUNDANCE OF BERYLLIUM IN FOUR STARS OF TYPE A
Journal Article
·
· Astrophysical Journal (U.S.)
By means of a curve-of-growth analysis of high-dispersion spectrograms, the ratio of the abundance of Be to that of Fe was determined for alpha /sup 2/ CVn (AOp) and alpha CMa (Al V) relative to the ratio in alpha Lyr (AO V). In addition, the position of alpha Gem A (A1 V) on the abandance scale so defined was estimated. The absolute ratio of Be to H was obtained for alpha Lyr with the aid of a published model atmosphere. The results show that the abundance of Be in alpha Lyr is approximately one-fourth of the solar abundance (Be/H = 10/ sup -10/). the Be-to-Fe ratio in alpha CMa is atleast 40 times less than in alpha Lyr, and in alpha /sup 2/ CVn it is 25 times more. The abundance ratio in alpha Gem A appears to be similar to that in alpha Lyr. The absence of Be in alpha CMa is interpreted as a possible consequence of the transfer of matter from its white dwarf companion when the latter was an M supergiant. Ths Be abundance difference between alpha /sup 2/ CVn and alpha Lyr, together with the apparent absence of mechanisms to reduce the initial surface abundance in alpha Lyr more than in alpha /sup 2/ CVn. suggest the active production of Be on the surface of alpha /sup 2/ CVn, probably in the early phases of its evolution. This suggestion, taken together with the evidence available on the abundance of lithium, indicates that the origin of Li, Be, and B is probably in nuclear processes at the surfaces of newly formed stars. (auth)
- Research Organization:
- Carnegie Institution of Washington, D.C.; California Inst. of Tech., Pasadena
- NSA Number:
- NSA-15-016271
- OSTI ID:
- 4050461
- Journal Information:
- Astrophysical Journal (U.S.), Journal Name: Astrophysical Journal (U.S.) Vol. Vol: 133; ISSN ASJOA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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