CCD UVBY beta photometry of faint stars. 2: Reddening in six fields in the Galaxy

Details CCD UVBY beta photometry of faint stars. 2: Reddening in six fields in the Galaxy CCD UVBY beta photometry of faint stars. 2: Reddening in six fields in the Galaxy

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292...92j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 92-101

Physics

7

Emission Spectra, Faint Objects, Galaxies, Interstellar Extinction, Light (Visible Radiation), Stars, Stellar Magnitude, Stellar Physics, Accretion Disks, Brightness, Charge Coupled Devices, Photometry

Scientific paper

Calibrated CCD uvby beta photometry for stars brighter than V approximately = 20 mdg in six Galactic fields is presented. For the F- and early G-type subsample E(b-y) is derived for stars at distances up to approximately = 10 kpc. For two directions sounding the inner part of the disk (fourth quadrant) a lower envelope in the E(b-y)-distance diagram is evident. The minimum reddening acquired by stars outside the disk corresponds to a projected total absorption through the disk of AV = 0.31mag and it is assumed to be contributed to the diffuse medium alone. For all six fields the derived total mean absorptions through the disk projected at (-90 deg, +90 deg) range from AV = 0.16mag to Av = 0.66mag, with an indication of a shift from 0.55mag to 0.25mag going from R approximately = 7 kpc to R approximately = 9 kpc. The weighted grand mean of the measured total visual absorption through the disk is 0.46mag indicating that the Galactic disk is optically thick at the solar position. The run of E(b-y) with distance for the low latitude fields supports our previously estimated scale height of the obscuring diffuse material of hz approximately = 140 pc. Reddening is found to be variable on small angular scales with AV varying up to 1.5mag inside a CCD field, which implies that mean absorption values should only be used with caution.

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