The Galactic Environments of Cool Stars - part I: Modeling Interstellar Dust around the Sun and Nearby Cool Stars

摘要

We present a model of the interaction of interstellar dust grains with astellar environment, that predicts the distribution of interstellar dust grainsin the size range between $0.1 {\rm \mu m}$ and $1 {\rm \mu m}$ around a starfor the whole stellar cycle. Comparisons of the model results with in-situ dustmeasurements by the Ulysses spacecraft in the Solar System validate the model.We show that in the case of the Sun, interstellar dust grains can produce largeregions of infrared emission that can be confused with a circumsolar dust diskwhen observed from afar. Our model can determine the shape of interstellar dustconcentrations close to nearby stars, if we have information on the relativevelocty of the stars with respect to the surrounding interstellar medium, andthe properties of the stellar wind.