Boron and beryllium in gamma Geminorum

Journal Article · Wed Apr 01 04:00:00 EST 1981 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158802· OSTI ID:6452262

Boesgaard, A M; Praderie, F

Observations have been made of the B II resonance line at 1362 A inthe A0 IV star ..gamma.. Gem with the Princeton spectrometer on the Copernicus satellite at a spectral resolution of 0.05 A. Complementary ground-based observations of the Be II resonance lines at 3130 and 3131 A have been made at Mauna Kea Observatory with a comparable resolution. A model-atmosphere abundance analysis has been done which includes the effects of the lines that blend with the B II and Be II lines. Previous data on ..cap alpha.. Lyr and ..cap alpha.. CMa for B II (which blends with a V III feature) have been reanalyzed with the help of new photographic and Reticon data from Mauna Kea which enable us to determine the V abundance. The results show that ..gamma.. Gem is depleted in B by a factor of 5--10 relative to ..cap alpha.. Lyr and other normal B stars and depleted in Be by at least a factor of 4. By comparison, the hot Am star ..cap alpha.. CMa is B-deficient by about 3 orders of magnitude and Be-deficient by at least 15 times. It is suggested that the abundance deficiencies are due to diffusion, and that ..cap alpha.. CMa is intrinsically a slow rotator, and ..gamma.. Gem is a slightly evolved slow rotator where some, but not all, of the B and Be has resurfaced.

• Research Organization: Institute for Astronomy, University of Hawaii
• OSTI ID: 6452262
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 245:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ATMOSPHERES
BERYLLIUM IONS
BORON IONS
CHARGED PARTICLES
CHEMICAL COMPOSITION
ELEMENTS
IONS
MAIN SEQUENCE STARS
METALS
SPECTRA
STARS
STELLAR ATMOSPHERES
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
VANADIUM