Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...45h&link_type=abstract
NOAO Proposal ID #1999A-0045
Computer Science
Scientific paper
We have found a significant asymmetry in the number of faint blue stars observed on either side of the Sun-Center line. The excess in the star counts is 30% to 40% between the fields at l=20° to 45° and their complementary fields at l=340° to 315° at b=+30°. No comparable excess is found at higher latitudes (40° or 50°) or in the anticenter direction. The excess in the star counts increases with fainter magnitudes and with decreasing longitude. The stars responsible for the excess are apparently 1-2 kpc above the stellar "bar" in the disk. A vertical extent of the bar this high seems unlikely; although, the excess in the counts could be due to a bar-induced `wake'. Alternatively, the asymmetry may indicate that the thick disk/inner halo is triaxial. We propose to obtain spectra for classification and radial velocities of the faint blue stars (17-19 mag) in the l=20° to 45° direction where the excess in counts is observed. The complementary fields at l=340° to 315° will be observed at CTIO. The purpose of our proposed observations is to identify the stellar population responsible for the asymmetry and determine its kinematics.
Debattista Victor P.
Humphreys Roberta M.
Larsen Jeffrey A.
Sellwood Jerry A.
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