J/A+A/318/416 J/A+A/318/416 Radial velocities & photometry of classical Cepheids F Pont D Queloz P Bratschi M Mayor Astron. Astrophys. 318 416 1997 1997A&A...318..416P Photometry Radial velocities Stars, variable Cepheids Galaxy: kinematics and dynamics stars: distances Radial velocities and distances have been measured for a sample of 48 remote classical Cepheids located in the outer disc of the Galaxy (118deg<l<274deg). The distances are determined from BVI photometry, with semi-empirical metallicity corrections calibrated on the Magellanic Clouds. Using these Cepheids as tracers, the rotation curve of the disc is determined between R_0_ and 2R_0_. The result is a flat rotation curve about 30km/s lower than theta_0_, V_rot_=193+/-4km/s for R_0_==8.5kpc and theta_0_=220kms/s assumed, or V_rot_=167+/-4km/s for R_0_=8kpc and theta_0_=200km/s. The possible presence of non-axisymmetric components in the rotation of the outer disc is considered. We find a very small or vanishing value for any radial motion of the LSR or expansion/contraction motion.

HJD Heliocentric Julian date d RV Radial velocity km/s e_RV rms uncertainty on RV km/s Name Object name --- Com Comment number=1 a: uncertain cross-correlation function b: doubtful identification c: almost certainly mistaken identification --- HJD Heliocetric Julian date d RV Radial velocity km/s e_RV rms uncertainty in RV (photon noise only) km/s Name Object name --- Name Object name --- HJD Heliocentric Julian date d Vmag V (Geneva) filter mag V-B V-B (Geneva) filter mag V-R V-R (Gunn) filter mag V-I V-I (Cousins) filer mag Com Comment number=1 a: low number of counts on B, uncertainty larger than 3% b: low number of counts on V c: observing run with too little standards observed, values with higher errors. --- Patricia Bauer CDS 1996Jun28 J_A+A_318_416.xml