Visual - near-infrared properties of the interstellar extinction towards the Galactic bulge with RR Lyrae stars
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Date
2018
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Abstract
Towards the bulge, studies of interstellar extinction are generally limited by uncertainties in the individual distances, magnitudes, and colors of the most commonly utilized stellar tracers. RR Lyrae stars, however, have well known absolute magnitudes and colors; furthermore, their distribution is known to be strongly centered around the Galactic center, easing the problem of unknown individual distances. We exploit these properties of RR Lyrae variables with large samples derived from wide-area surveys (OGLE, VVV) to study the interstellar extinction in optical and near-infrared wavelengths towards the Galactic bulge....