A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations

Details A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..810o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 3, p. 810-826

Astronomy and Astrophysics

Astrophysics

39

Astrometry, Galactic Structure, Kinematics, Milky Way Galaxy, Star Distribution, Stellar Motions, Analog To Digital Converters, Astronomical Photometry, Optical Filters, Photographic Plates, Quasars, Schmidt Telescopes

Scientific paper

We present the results from a new complete absolute proper motion survey in the direction of intermediate galactic latitude (L = 167.5 deg, b = 47.4 deg) with respect to background galaxies and quasars, using a set of Tautenburg and OCA (Observatoire de la Cote d'Azur) Schmidt plates, obtained at different epochs separated by approximately 25 years. Photometric U, B and V survey has been done for 4167 objects covering 18.8 square degree field and proper motions have been calculated for 1888 objects for a 8.6 deg2 area. The resulting catalogs are complete down to V = 17, B = 19 and U = 16.5. An average proper motion accuracy of 0.25 sec per century was achieved for stars brighter than V = 16, with the uncertainties increasing to approximately 0.4 sec per century at V greater than 16. The photometric accuracy ranges between 0.07 to 0.10 in the three bands. We utilize our photometric and absolute proper motions data to investigate the structure and kinematics of the Galaxy. We have determined ultraviolet excesses and distances for a sub-sample of 2685 stars in the color range 0.3 less than or equal to (B-V) less than or equal to 0.9 and with V less than or equal to 17. Thus we have been able to probe the kinematical distribution of F and G-type stars to distances up to 3.5 kpc from the plane. We obtain a value -0.21 +/- 0.1/kpc for the galactic radial gradient of velocity dispersion. By comparing the ratio of stars in this direction to the number of stars towards galactic center at intermediate latitude (l =3 deg, b = 47 deg), give a strong evidence that the scale length of old disk is rather short (2-2.5 kpc). Because of the kinematical biases inherent in our data sample, we can not present definite kinematical parameters for the intermediate population, but reasonable estimates would be an asymmetric drift of 57 +/- 4 km/s and velocity dispersion of 60 +/- 3 km/s at a mean distance (above the plane) of z = 2 kpc.

Affiliated with

Also associated with

No associations

Rating

A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new UBV and proper motion survey in the anticentre direction at intermediate galactic latitude: Kinematics of the Galaxy's stellar populations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1254507