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From: Molly Peeples  molly@astronomy.ohio-state.edu 
To: gcnews@aoc.nrao.edu
Subject: submit paper.tex ApJL, accepted

%astro-ph/0610212
\title{The Nature of the Variable Galactic Center Source GCIRS 16SW
Revisited: A Massive Eclipsing Binary}

\author{Molly S. Peeples (1),  A. Z. Bonanos (2),  D. L. DePoy (1),  K. Z.
Stanek (1),  J. Pepper (1),  Richard W. Pogge (1),  M. H. Pinsonneault
(1),  K. Sellgren (1)}
\inst{((1) Ohio State, (2) Carnegie Institute of
Washington)}

\begin{abstract}
We present a re-analysis of our H- and K-band photometry and
light-curves for GCIRS 16SW, a regular periodic source near the
Galactic center.  These data include those presented by DePoy et al.
(2004); we correct a sign error in their reduction, finding GCIRS 16SW
to be an eclipsing binary with no color variations.  We find the
system to be an equal mass overcontact binary (both stars overfilling
their Roche lobes) in a circular orbit with a period P=19.4513 days,
an inclination angle i=71 degrees.  This confirms and strengthens the
findings of Martins et al. (2006) that GCIRS 16SW is an eclipsing
binary composed of two ~50Msun stars, further supporting evidence of
recent star formation very close to the Galactic center.  Finally, the
calculated luminosity of each component is close to the Eddington
luminosity, implying that the temperature of 24400 K given by Najarro
et al. (1997) might be overestimated for these evolved stars.
\end{abstract}