Papers › Luminosity distance and extinction by submicrometer-sized grains
Luminosity distance and extinction by submicrometer-sized grains
Ralf Siebenmorgen, Frank Heymann, Rolf Chini
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The distance to the stars is a fundamental parameter, which is determined via two primary methods - parallax and luminosity. While the parallax is a direct trigonometric method, the luminosity distance is usually influenced by interstellar extinction. As long as the optical properties of dust grains are wavelength-dependent this contamination can be corrected. With increasing grain size, however, the extinction properties become grey, i.e. they contribute at wavelengths but can no longer be detected by photometry. However, as the grain size increases, the extinction properties become grey, meaning these particles contribute by a constant at wavelengths below 1 mic, making them undetectable by photometry in the optical. In this study, we compare the parallactic and luminosity distances of a pristine sample of 33 well-known early-type stars with non-peculiar reddening curves and find that the luminosity distance overestimates the parallactic distance in 80% of the cases. This discrepancy can be removed when incorporating a population of large, submicrometer-sized dust grains in a dust model that provides grey extinction which diminishes the luminosity distance accordingly.
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