HIPPARCOS observations of hydrogen-deficient carbon stars

Details HIPPARCOS observations of hydrogen-deficient carbon stars HIPPARCOS observations of hydrogen-deficient carbon stars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15..179c&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 2, p. 179-182

Astronomy and Astrophysics

Astronomy

12

Agb Stars, Post-Agb Stars, Carbon Stars, Stellar Kinematics

Scientific paper

Parallax measurements for 21 hydrogen-deficient carbon stars have been made by the Hipparcos satellite. These stars include most of the brighter R Coronae Borealis (RCB) variables, other cool hydrogen-deficient carbon (HdC) stars, and several higher-temperature extreme helium (eHe) stars. Most of these stars have either negative or statistically insignificant parallaxes, indicating that they lie beyond the detection capability of Hipparcos. Although the distances to the galactic hydrogen-deficient carbon stars remain unknown, at least the Hipparcos observations do confirm that these objects must have high luminosity like the LMC RCB stars, for which M_bol = -4 to -5. Based upon Hipparcos proper motions, we derive UVW velocities for the RCB and HdC stars, assuming M_bol = -3 and -5. The UW-velocity dispersion of the RCB/HdC stars is similar to that already reported for the eHe stars, further supporting that these groups of stars have predominantly bulge distributions. However, UW Cen may be a second example of a halo RCB star currently seen transitting the galactic plane.

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