1999/10/01 by D. K. Ojha, O. Bienayme, Ojha, D. K. +6
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9910016
13 pages, 8 PS figures, To appear in A&A
arxiv created 1999/10/01 · openalex publication_date 1999/10/01 · arxiv updated 2009/12/01 · openalex created_date 2019/07/12 · openalex updated_date 2026/07/28
A photometric and proper motion survey has been obtained in 2 directions at\nintermediate latitude: (l=167.5^\∘, b=47.4^\∘;\n\α2000=9h41m26s,\δ2000=+49^\∘53'27'') and\n(l=278^\∘, b=47^\∘; \α2000=11h42m56s,\n\δ2000=-12^\∘31'42''). The survey covers 7.13 and 20.84 square\ndegrees, respectively. The limiting magnitude is about 18.5 in V for both\ndirections. We have derived the density laws for stars (MV \≥ 3.5) as a\nfunction of distance from the galactic plane. The density laws for stars follow\na sum of two exponentials with scale heights of 240 pc (thin disk) and 790 pc\n(thick disk), respectively. The local density of thick disk is found to be\n6.1\±3 % relative to the thin disk. The kinematical distribution of stars\nhas been probed to distances up to 3.5 kpc above the galactic plane. New\nestimates of the parameters of velocity ellipsoid have been derived for the\nthick disk of the Galaxy. A comparison of our data sets with the Besan c con\nmodel star count predictions has been performed, giving a good agreement in the\nmagnitude range V = 13 to 18.\n