Carbon-Rich Mira Variables: Radial Velocities and Distances

Details Carbon-Rich Mira Variables: Radial Velocities and Distances Carbon-Rich Mira Variables: Radial Velocities and Distances

2006-03-18

arxiv.org/abs/astro-ph/0603505v1

Mon.Not.Roy.Astron.Soc.369:783-790,2006

Astronomy and Astrophysics

Astrophysics

11 pages, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10323.x

Optical radial velocities have been measured for 38 C-type Mira variables. These data together with others in the literature are used to study the differences between optical and CO mm observations for C-Miras and the necessary corrections to the optical velocities are derived in order to obtain the true radial velocities of the variables. The difference between absorption and emission line velocities is also examined. A particularly large difference (+30 km\s) is found in the case of the H-alpha emission line. A catalogue is given of 177 C-Miras with estimated distances and radial velocities. The distances are based on bolometric magnitudes derived in Paper I using SAAO observations or (for 60 of the stars) using non-SAAO photometry. In the latter case the necessary transformations to the SAAO system are derived. These data will be used in paper III to study the kinematics of the C-Miras.

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