Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1406t&link_type=abstract
American Astronomical Society, AAS Meeting #212, #14.06; Bulletin of the American Astronomical Society, Vol. 40, p.208
Other
2
Scientific paper
We present the findings to date of an ongoing observation program of O stars using the CHARA Array. This program uses the CHARA Array facility K'-band, open-air beam combiner, known as CHARA Classic, to probe the narrow angular region around the target star, a task that interferometry is uniquely suited to perform. The data were taken as part of a "queue" observation program, taking advantage of the lull times between objects of other, scheduled observing programs. To date, 12 of 24 objects have been observed with at least one baseline, and 7 with at least two baselines. We have employed two techniques for analysis, a "wide-field" mode, which looks for companions of an angular separation of 10-30 milliarcseconds by looking for two separated fringe packets, and a calibrated mode, where closer binaries and diameters are investigated by means of comparing the measured visibilities with those of unresolved calibrators. One object, HD 193322 (CHARA 96Aa), has provided us the opportunity to use both techniques. It has shown a double fringe packet at certain baselines, which allows us to use the second fringe packet as a calibrator for the first. The first fringe packet contains the mixed interference fringes of two stars -- a known spectroscopic binary.
This research has been supported by Georgia State University, the National Science Foundation, and the W.M. Keck Foundation.
Mason Brian D.
ten Brummelaar Theo A.
Turner Nils H.
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