Stellar populations and inhomogeneities of the galactic plane from DENIS star counts.

Details Stellar populations and inhomogeneities of the galactic plane from DENIS star counts. Stellar populations and inhomogeneities of the galactic plane from DENIS star counts.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..597r&link_type=abstract

Astronomy and Astrophysics, v.326, p.597-607

Astronomy and Astrophysics

Astrophysics

16

Galaxy: Structure, Galaxy: Stellar Content, Infrared: Stars

Scientific paper

This paper reports on the analysis of 3-colour (IJK_s_) near infrared star counts obtained during the commissioning phase of the Deep Near Infrared Southern Sky Survey (DENIS) project. Observing methods, data processing, source extraction and calibration are briefly outlined. Nine strips of 12' of RA x 30° in declination crossing the galactic plane at different longitudes ranging from 217° to 385°, covering approximately 50 square degrees are analyzed. One strip has been measured in 3 colours, the others in J and K_s_ only. More than 250 000 objects are detected and calibrated. The completeness limits are 17.5, 15.5 and 13.5 in the I, J and K_s_ bands, respectively. Colour-colour diagrams are shown to be efficient tool for breaking out dwarf and giant star populations especially at low latitude, where the interstellar extinction strongly affects the far away red giants. Source counts are compared to the SKY model developed by Wainscoat et al. (1992ApJS...83..111W). This small sample of DENIS data is tentatively used to investigate the existence and the spatial distribution of the stellar populations associated with the molecular ring at R_G.C._=4kpc.

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