Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-10-07
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
14 pages, 8 figures, accepted for publication in Acta Astronomica
Scientific paper
We present results of a search for objects with H-alpha excess, such as cataclysmic variables (CVs) and chromospherically active binaries (ABs), as counterparts to X-ray sources detected with Chandra satellite observatory in six Galactic globular clusters (GCs): M4, M28, M30, M71, M80, NGC 6752. Binary systems play a critical role in the evolution of GCs, serving as an internal energy source countering the tendency of GC cores to collapse. Theoretical studies predict dozens of CVs in the cores of some GCs (e.g., 130 for M28, 40 for M30). A number of such binaries is also expected outside the core radius. However, few CVs are known so far in GCs. Using subtraction technique applied to images taken with the 4.1-m SOAR telescope we have found 27 objects with H-alpha excess in the field of the observed clusters, of which nine are likely associated with the clusters. Four are candidate CVs, four candidate ABs, one could be either a CV or an AB. One H-alpha object seems to be a background galaxy, while other 17 detected objects are probably foreground or background stars.
No associations
LandOfFree
H-alpha Imaging of X-ray Sources in Selected Globular Clusters with the SOAR Telescope 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 H-alpha Imaging of X-ray Sources in Selected Globular Clusters with the SOAR Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H-alpha Imaging of X-ray Sources in Selected Globular Clusters with the SOAR Telescope will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-36728