Open AccessCarbon‐rich Mira variables: radial velocities and distances
Author(s) -
Menzies John W.,
Feast Michael W.,
Whitelock Patricia A.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10323.x
Subject(s) - physics , radial velocity , photometry (optics) , astrophysics , stars , observatory , line (geometry) , astronomy , geometry , mathematics
Optical radial velocities have been measured for 38 C‐type Mira variables (C‐Miras). These data together with others in the literature are used to study the differences between optical and CO millimetre (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 −1 ) is found in the case of the Hα 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 South African Astronomical Observatory (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.