Interstellar velocity components towards reddened stars

A Catalog of Background Stars Reddened by Dust in the Taurus Dark Clouds

Normal field stars located behind dense clouds are a valuable resource in interstellar astrophysics, as they provide continua in which to study phenomena such as gas-phase and solid-state absorption features, interstellar extinction and polarization. This paper reports the results of a search for highly reddened stars behind the Taurus Dark Cloud complex. We use the Two Micron All Sky Survey (2...

Optical observations of three Galactic halo stars: evidence for cloudlets in intermediate- and high-velocity interstellar clouds

Very high resolution (R ∼ 160000) absorption line measurements of the interstellar Ca ii K and Na i D lines and medium resolution (R ∼ 50000) measurements of the interstellar Ti ii (3384 Å) line towards three Galactic halo stars are presented. The data have signal-to-noise ratios of ∼ 90–240. The sightlines studied clearly show several intermediate-high velocity interstellar clouds with local s...

Runaway Stars, Hypervelocity Stars, and Radial Velocity Surveys

Runaway stars ejected from the Galactic disk populate the halo of the Milky Way. To predict the spatial and kinematic properties of runaways, we inject stars into a Galactic potential, compute their trajectories through the Galaxy, and derive simulated catalogs for comparison with observations. Runaways have a flattened spatial distribution, with higher velocity stars at Galactic latitudes less...

Ionisation impact of high-mass stars on interstellar filaments

Context. Ionising stars reshape their original molecular cloud and impact star formation, leading to spectacular morphologies such as bipolar nebulae around H ii regions. Molecular clouds are structured in filaments where stars principally form, as revealed by the Herschel space observatory. The prominent southern hemisphere H ii region, RCW 36, is one of these bipolar nebulae. Aims. We study t...

Polarization of Light From Distant Stars by Interstellar Medium.