Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1605l&link_type=abstract
American Astronomical Society Meeting 210, #16.05; Bulletin of the American Astronomical Society, Vol. 39, p.116
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Binary systems have a large effect on globular cluster dynamics and evolution. Among the binaries known to exist in significant numbers in globluar clusters are cataclysmic variables (CVs). However, little is known about their probable precursors, namely detached main-sequence/white-dwarf systems. We present preliminary work on the feasibility of detecting detached binaries composed of white dwarfs and main-sequence stars in globular clusters. Such binaries will reside in the region between the main sequence and the white-dwarf sequence in a color-magnitude diagram (CMD). However, these binaries must be distinguished from the typically numerous background (non-member) single stars that also populate this region. We are focusing on the nearby globular cluster NGC 6397 for which we have previously obtained WFPC2 and ACS/WFC imaging in UBVRI filters (F336W through F814W) as well as H-alpha. We use the broad-band filters to discriminate between single stars and binaries, while the H-alpha filter enables us to distinguish detached binaries from CVs (which appear bright in H-alpha relative to R images due to their Balmer emission lines). We have compared the spectra of synthetic binary systems constructed using IRAF/SYNPHOT to models of single stars and found that they can best be differentiated using the F336W and/or F814W filters. We present CMDs and color-color diagrams illustrating the location and layout of the model binary sequences relative to those of the single-star sequences. We also show initial comparisons between the theoretical sequences and the photometric sequences measured from NGC 6397.
Cool Adrienne
Lopez Liliana I.
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