Whither the LSR: Anticenter carbon star velocities

Details Whither the LSR: Anticenter carbon star velocities Whither the LSR: Anticenter carbon star velocities

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..177m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 1, p. 177-182

Astronomy and Astrophysics

Astrophysics

20

Carbon Stars, Disk Galaxies, Galactic Rotation, Galactic Structure, Radial Velocity, Astronomical Photometry, Kinematics, Stellar Motions

Scientific paper

We report new radial measurements of 179 carbon stars toward the Galactic anticenter with accuracies of 4 km/s. We derive distances to the carbon stars from existing K-band photometry and derive an average galactocentric radius of 13.9 kpc for the stars in the sample. Using the new velocities we find that the carbon star sample is moving radially outward with respect to the local standard of rest at a velocity of 6.6 +/- 1.7 km/s. This is in disagreement with the nonaxisymmetric rotation curve model proposed by Blitz & Spergel, which predicts a motion in the opposite direction. We find no systematic difference in the peculiar motion on either side of the anticenter and see no significant trend with distance. The radial velocity dispersion of sample is 23 km/s and does not appear to vary with increasing radius.

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