High resolution reddening map in the direction of the stellar system Terzan 5
Abstract
We have used optical images acquired with the Hubble Space Telescope to construct the first high-resolution extinction map in the direction of Terzan 5, a peculiar stellar system in the inner bulge of our Galaxy. The map has a spatial resolution of 8" X 8", over a total FoV of 200" X 200". The absorption clouds show a patchy structure on a typical scale of 20" and extinction variations as large as delta E(B-V) = 0.67 mag, especially in the direction of the center of the system. These correspond to an absolute color excess ranging from E(B-V)=2.15 mag, up to 2.82 mag. After the correction for differential reddening, two distinct red giant branches become clearly visible in the color magnitude diagram of Terzan 5 and they well correspond to the two sub-populations with different iron abundances recently discovered in this system.
Keywords
Cite
@article{arxiv.1209.0990,
title = {High resolution reddening map in the direction of the stellar system Terzan 5},
author = {Davide Massari and Alessio Mucciarelli and Emanuele Dalessandro and Francesco R. Ferraro and Livia Origlia and Barbara Lanzoni and Giacomo Beccari and R. Michael Rich and Elena Valenti and Scott M. Ransom},
journal= {arXiv preprint arXiv:1209.0990},
year = {2012}
}
Comments
Published by the Astrophysical Journal Letters, Volume 755, Issue 2, article id. L32 (2012). 15 pages, 5 figures