On the Binarity of Carbon-Enhanced, Metal-Poor Stars
| dc.creator | Tsangarides, S. | |
| dc.creator | Ryan, S. G. | |
| dc.creator | Beers, T. C. | |
| dc.date | 2004-12-07 | |
| dc.date.accessioned | 2026-07-25T12:20:36Z | |
| dc.description | We report on a programme to monitor the radial velocities of a sample of candidate and confirmed carbon-enhanced, metal-poor (CEMP) stars. We observed 45 targets using the Echelle Spectrographs of three 4m class telescopes. Radial velocities for these objects were calculated by cross-correlation of their spectra with the spectrum of HD 140283, and have errors < 1 km/s. Sixteen of our programme's targets have reported carbon excess, and nine of these objects also exhibit s-process enhancements (CEMP-s). We combine these stars' radial velocities with other literature studies in search of binarity. The search reveals that four of our CEMP-s stars (44%) are in binary systems. Using the analysis of Lucatello et al. (2004), we find that all the CEMP-s stars in our sample are binaries. This conclusion implies that CEMP-s stars may be the very metal-poor relatives of CH and Ba II stars, which are believed to have acquired their peculiar abundance patterns by mass transfer from a thermally-pulsing AGB companion. | |
| dc.description | 6 pages, 2 tables, 1 figure, Mem. S. A. It., in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0412160 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0412160 | |
| dc.identifier | Mem.Soc.Ast.It. 75 (2004) 772 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/9540 | |
| dc.subject | Astrophysics | |
| dc.title | On the Binarity of Carbon-Enhanced, Metal-Poor Stars | |
| dc.type | text |