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The M 4 Core Project with HST: I. Overview and first epoch
van den Berg, M.; Anderson, J.; Milone, A. P. +13 more
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M 4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive companions (black holes, neutron stars, or white dwarfs) by measuring the ``wobble'' of the luminou…
Advanced Spectral Library (ASTRAL): Cool stars edition
Ayres, T. R.
ASTRAL is a project to create high-resolution, high-S/N UV (1150-3200 Å) atlases of bright stars utilizing {HST}/STIS. During Cycle 18 (2010-2011), eight cool star targets were observed, including key objects like Procyon and Betelgeuse, churning through 146 orbits in the process. The new spectral atlases are publically available through the proje…
The opacity of spiral galaxy disks: IX. Dust and gas surface densities
Leroy, A.; Holwerda, B. W.; Allen, R. J. +4 more
Our aim is to explore the relation between gas, atomic and molecular, and dust in spiral galaxies. Gas surface densities are from atomic hydrogen and CO line emission maps. To estimate the dust content, we use the disk opacity as inferred from the number of distant galaxies identified in twelve HST/WFPC2 fields of ten nearby spiral galaxies. The o…