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On the Binarity of Carbon-Enhanced, Metal-Poor Stars | S. Tsangarides
; S. G. Ryan
; T. C. Beers
; | Date: |
7 Dec 2004 | Journal: | Mem.Soc.Ast.It. 75 (2004) 772 | Subject: | astro-ph | Affiliation: | The Open University, Milton Keynes, UK, Michigan State University and JINA, East Lansing, USA | Abstract: | 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. | Source: | arXiv, astro-ph/0412160 | Services: | Forum | Review | PDF | Favorites |
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