The Deepest UV Observations of a Globular Cluster: Preliminary Results for NGC 6681

Details The Deepest UV Observations of a Globular Cluster: Preliminary Results for NGC 6681 The Deepest UV Observations of a Globular Cluster: Preliminary Results for NGC 6681

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2608c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #26.08; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The globular cluster NGC 6681 (M70), a post-core-collapse galactic cluster, has been imaged extensively in the nearand far-ultraviolet with HST as a calibration target for both STIS and ACS. An aggregate dataset of 605 UV exposures taken on 53 occasions yields the deepest nearand far-UV survey of a globular cluster to date. Reduction and analysis of this massive, multi-epoch dataset allows for the study of the hot stellar populations within the cluster core. If present, cataclysmic variables (CVs), low-mass X-ray binaries (LMXBs), blue stragglers (BSs), hot white dwarfs, and extreme blue horizontal branch (EBHB) stars may be investigated in the UV images. EBHB and BS stars are believed to be the result of close stellar interactions -the former posited to be the result of mass exchange and the latter created via direct collisions or merger events. Close binary objects such as CVs and LMXBs may act to effectively heat their host cluster as encounters with passing single stars cause the loss of binding energy (“hardening”) in the binary orbit and an increase in the translational motion of the interacting cluster star. Characterization of the hot stellar populations is thus essential to testing current formation scenarios and understanding the dynamical evolution of globular clusters. Preliminary color-magnitude diagrams constructed using the STIS near-UV and far-UV observations are presented here.

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