The surprising external upturn of the Blue Straggler radial distribution in M55

Details The surprising external upturn of the Blue Straggler radial distribution in M55 The surprising external upturn of the Blue Straggler radial distribution in M55

2007-09-11

arxiv.org/abs/0709.1609v1

Astronomy and Astrophysics

Astrophysics

in press on ApJ

Scientific paper

10.1086/522301

By combining high-resolution HST and wide-field ground based observations, in ultraviolet and optical bands, we study the Blue Straggler Star (BSS) population of the low density galactic globular cluster M55 (NGC 6809) over its entire radial extent. The BSS projected radial distribution is found to be bimodal, with a central peak, a broad minimum at intermediate radii, and an upturn at large radii. Similar bimodal distributions have been found in other globular clusters (M3, 47 Tucanae, NGC 6752, M5), but the external upturn in M55 is the largest found to date. This might indicate a large fraction of primordial binaries in the outer regions of M55, which seems somehow in contrast with the relatively low (\sim 10%) binary fraction recently measured in the core of this cluster.

Affiliated with

Also associated with

No associations

Rating

The surprising external upturn of the Blue Straggler radial distribution in M55 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The surprising external upturn of the Blue Straggler radial distribution in M55, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The surprising external upturn of the Blue Straggler radial distribution in M55 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-392338