Influence of the gould belt on interstellar extinction |
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| Authors: | G A Gontcharov |
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| Institution: | 1.Pulkovo Astronomical Observatory,Russian Academy of Sciences,St. Petersburg,Russia |
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| Abstract: | A new analytical 3D model of interstellar extinction within 500 pc of the Sun as a function of the Galactic spherical coordinates
is suggested. This model is physically more justified than the widely used Arenou model, since it takes into account the presence
of absorbing matter both in the layer along the equatorial Galactic plane and in the Gould Belt. The extinction in the equatorial
layer varies as the sine of the Galactic longitude and in the Gould Belt as the sine of twice the longitude in the Belt plane.
The extinction across the layers varies according to a barometric law. It has been found that the absorbing layers intersect
at an angle of 17° and that the Sun is located near the axial plane of the absorbing layer of the Gould Belt and is probably
several parsecs below the axial plane of the equatorial absorbing layer but above the Galactic plane. The model has been tested
using the extinction of real stars from three catalogs. |
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