A complete, multicolor survey of absolute proper motions to B of about 22.5 - Galactic structure and kinematics at the north Galactic pole

Details A complete, multicolor survey of absolute proper motions to B of about 22.5 - Galactic structure and kinematics at the north Galactic pole A complete, multicolor survey of absolute proper motions to B of about 22.5 - Galactic structure and kinematics at the north Galactic pole

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...78...87m&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 78, Jan. 1992, p. 87-152.

Astronomy and Astrophysics

Astronomy

209

Astrometry, Astronomical Photometry, Galactic Structure, Sky Surveys (Astronomy), Stellar Motions, Color-Magnitude Diagram, Milky Way Galaxy

Scientific paper

Results from a new complete survey of stellar property motions and multicolor (UBVI) photometry to B of about 22.5 in the north Galactic pole field SA 57 are presented. The importance of secular magnitude and color effects in astrometric surveys of field stars are highlighted. Serious systematic errors are found in a similar survey by Chiu (1980). High-quality photographic photometry is used to determine UV excesses and photometric parallaxes for 250 stars in the color range 0.3 to 1.10 and with U not more than 21.5. An unexpectedly sharp break is found in the distribution of UV excess at about 5.5 kpc above the Galactic plane. Features in the kinematical distribution are also seen at this distance. It is suggested that there is a correspondingly sharp change in the mix of stellar populations at a distance of about 5.5 kpc above the Galactic plane, which is associated with an 'edge' of the Galactic thick disk. Evidence for a candidate halo moving group at z of about 4550 pc at the north Galactic pole is presented.

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