Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-02-15
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted by MNRAS: 16 pages, 5 figures
Scientific paper
HD 65949 is a late B star with exceptionally strong Hg II at 3984[A], but it is not a typical HgMn star. The Re II spectrum is of extraordinary strength. Abundances, or upper limits are derived here for 58 elements based on a model with Teff = 13100K, and log(g) = 4.0. Even-Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd-Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. The abundance pattern of the heaviest elements resembles the N=126 r-process peak of solar material, though not in detail. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. This indicates the relevance of photospheric or near-photospheric processes. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. Likely primary and secondary masses are near 3.3 and 1.6 M(solar), with a separation of ca. 0.25 AU. New atomic structure calculations are presented in two appendices.
Biémont É.
Cowley Ch. R.
González Javier Francisco
Hubrig Svetlana
Palmeri Patrick
No associations
LandOfFree
HD 65949: Rosetta Stone or Red Herring does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with HD 65949: Rosetta Stone or Red Herring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HD 65949: Rosetta Stone or Red Herring will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-597461