Precision photometry of young stellar groups towards the outer Galactic disk and the Galactic rotation curve

Abstract

view Abstract Citations (44) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Precision Photometry of Young Stellar Groups Towards the Outer Galactic Disk and the Galactic Rotation Curve Turbide, Luc ; Moffat, Anthony F. J. Abstract We have used a CCD to obtain stellar UBV magnitudes to V = 18 towards eight distant, young stellar groups in the third Galactic quadrant where interstellar extinction is low (l = 210 deg-242 deg). Comparison with theoretical isochrones yields ages and distances of significantly improved precision compared to previous studies based on photoelectric diaphragm photometry. One of the groups (in the faint H II region S 289) is located twice as far from the Galactic center as the sun and is likely located near the outer limit of active star formation in the Galactic disk. Together with published radial velocities and allowing for a metallicity gradient, the new distances harden the evidence for a flat Galactic rotation curve out to R about 16 kpc. Publication: The Astronomical Journal Pub Date: May 1993 DOI: 10.1086/116558 Bibcode: 1993AJ....105.1831T Keywords: Astronomical Photometry; Charge Coupled Devices; Color-Magnitude Diagram; Galactic Rotation; Radial Velocity; Stellar Magnitude; Faint Objects; Interstellar Extinction; Astronomy; GALAXY: STELLAR CONTENT; GALAXY: KINEMATICS AND DYNAMICS full text sources ADS | data products SIMBAD (39)