other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2010MNRAS.405.1271C - Mon. Not. R. Astron. Soc., 405, 1271-1284 (2010/June-3)
HD 65949: rosetta stone or red herring.
COWLEY C.R., HUBRIG S., PALMERI P., QUINET P., BIEMONT E., WAHLGREN G.M., SCHUTZ O. and GONZALEZ J.F.
Abstract (from CDS):
We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near-photospheric processes. Large excesses (4-6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. 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.
New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M☉, with a separation of ca. 0.25 au.
New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Reii spectrum.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): astrochemistry - diffusion - stars: abundances - stars: chemically peculiar - stars: individual: HD 65949 - stars: individual: HR 7143
Simbad objects: 8
To bookmark this query, right click on this link: simbad:2010MNRAS.405.1271C and select 'bookmark this link' or equivalent in the popup menu