Article ID: gc444
Author	Massari, D. et al.
Title	Hubble Space Telescope Absolute Proper Motions Of NGC 6681 (M70) and the Sagittarius Dwarf Spheroidal Galaxy
Journal	The Astrophysical Journal, Volume 779, Issue 1, article id. 81, 9 pp.
Year of publication	2013 (on gclusters from 2014-02-10 08:29:04 )
Abstract	We have measured absolute proper motions for the three populations intercepted in the direction of the Galactic globular cluster NGC 6681: the cluster itself, the Sagittarius dwarf spheroidal galaxy, and the field. For this, we used Hubble Space Telescope ACS/WFC and WFC3/UVIS optical imaging data separated by a temporal baseline of 5.464 yr. Five background galaxies were used to determine the zero point of the absolute-motion reference frame. (....) In this study we also use background Sagittarius Dwarf Spheroidal stars to determine the rotation of the globular cluster in the plane of the sky and find that NGC 6681 is not rotating significantly: v rot = 0.82 ± 1.02 km s–1 at a distance of 1' from the cluster center.
CM diagram
Tags	NGC 6681 , cmd

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