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Photoelectric Radial Velocities, Paper XX 45 Years’ Monitoring of the Radial Velocities of the Redman K Stars

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Abstract

The ‘Redman K stars’ are a group of 80-odd seventh-magnitude late-type stars, nearly all giants, distributed along the Galactic equator between approximate longitudes 50° and 150° (roughly Sagitta to Cassiopeia). Their radial velocities have been measured systematically once per season in 30 of the 45 seasons from 1966 to 2010/11. At least 26 of them (30%) have proved to vary in velocity. Orbits have been derived for all but one of the 26, many of them having longer periods than have normally been associated with spectroscopic binaries; several are comparable with, or longer than, the present duration of the observing campaign. Also reported here are radial-velocity measurements made casually of stars seen in the fields of some of the Redman stars. Two of the companions have proved to vary in velocity on long time-scales, and (somewhat preliminary) orbits are given for them.

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  1. The Observatories, Madingley Road, Cambridge, CB3 0HA, UK

    R. F. Griffin & A. Stroe

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  1. R. F. Griffin
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  2. A. Stroe
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Correspondence to R. F. Griffin.

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Griffin, R.F., Stroe, A. Photoelectric Radial Velocities, Paper XX 45 Years’ Monitoring of the Radial Velocities of the Redman K Stars. J Astrophys Astron 33, 245–278 (2012). https://doi.org/10.1007/s12036-012-9146-4

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  • DOI: https://doi.org/10.1007/s12036-012-9146-4

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