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Abstract: We report 349 radial velocities for 45 metal-poor field red giant and redhorizontal branch stars. We have have identified one new spectroscopic binary,HD 4306, and one possible such system, HD 184711. We also report 57 radialvelocities for 11 of the 91 stars reported on previously by Carney et al.2003. As was found in the previous study, radial velocity -jitter- is presentin many of the most luminous stars. Excluding stars showing spectroscopicbinary orbital motion, all 7 of the red giants with MV <= -2.0 displayjitter, as well as 3 of the 14 stars with -2.0 <= MV <= -1.4. We have alsomeasured line broadening in all of the new spectra, using synthetic spectra astemplates. The most luminous red giants show significant line broadening, as domany of the red horizontal branch stars, and we discuss briefly possiblecauses.



Autor: Bruce W. Carney, David W. Latham, R. P. Stefanik, John B. Laird

Fuente: https://arxiv.org/



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