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 abstract.tex ApJ, in press
Date: Fri, 9 Mar 2007 23:38:17 -0800
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astro-ph/0703175


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\documentclass[12pt,preprint]{aastex}=0A%%\usepackage{epsfig}=0A=0A=20=
\def\Mdot{\hbox{$\dot=20{M}$}}=0A=20\def\Zdot{\hbox{$\dot=20{Z}$}}=0A=20=
\def\Rsun{\hbox{\it=20R$_\odot$}}=0A=20\def\Rstar{\hbox{\it=20R$_*$}}=0A=20=
\def\Lsun{\hbox{\it=20L$_\odot$}}=0A=20\def\Lstar{\hbox{\it=20L$_*$}}=0A=20=
\def\Msun{\hbox{\it=20M$_\odot$}}=0A=20\def\Msunyr{\hbox{\it=20=
M$_\odot\,$yr$^{-1}$}}=0A=20\def\Myr{\hbox{\it=20Myr}}=0A=20=
\def\Gyr{\hbox{\it=20Gyr}}=0A=20\def\Teff{\hbox{\it=20T$_{\rm=20eff}$}}=0A=
=20\def\Vinf{\hbox{$v_\infty$}}=0A=20\def\kms{\hbox{km$\,$s$^{-1}$=20}}=0A=
\def\sgrastar{\mbox{Sgr=20A$^*$}}=0A\def\cxo{\textit{Chandra=20X-ray=20=
Observatory$~$}}=0A=0A\begin{document}=0A\title{Discovery=20of=20Hot=20=
Supergiant=20Stars=20Near=20the=20Galactic=20Center}=0A=0A\shorttitle{}=0A=
=0A\author{Jon=20C.=20Mauerhan\altaffilmark{1},=20Michael=20P.=20=
\altaffiltext{1}{Department=20of=20Astronomy=20and=20Astrophysics,=20=
UCLA,=20405=20Hilgard=20Ave.,=20Los=20Angeles,=20CA=2090095}=0A=
\altaffiltext{2}{Space=20Radiation=20Laboroatory,=20California=20=
Institute=20of=20Technology,=20Pasadena,=20CA,=2091125}=0A=0A=
\begin{abstract}=0A=0AWe=20report=20new=20results=20of=20a=20campaign=20=
to=20find=20Wolf-Rayet=20and=20O=20(WR/O)=20stars=20and=20high-mass=20=
X-ray=20binaries=20(HMXBs)=20in=20the=20Galactic=20center.=20We=20=
searched=20for=20candidates=20by=20cross-correlating=20the=20=
{\textit{Two-Micron=20All-Sky=20Survey}}=20with=20a=20deep=20\cxo=20=
catalog=20of=20point=20sources=20in=20the=20Radio=20Arches=20region.=20=
Following=20up=20with=20$K$-band=20spectroscopy,=20we=20found=20two=20=
massive=20stellar=20counterparts=20to=20CXOGC=20J174555.3-285126=20and=20=
CXOGC=20J174617.0-285131,=20which=20we=20classify=20as=20a=20broad-lined=20=
WR=20star=20of=20sub-type=20WN6b=20and=20an=20O=20Ia=20supergiant,=20=
respectively.=20Their=20X-ray=20properties=20are=20most=20consistent=20=
with=20those=20of=20known=20colliding-wind=20binaries=20in=20the=20=
Galaxy=20and=20the=20Large=20Magellanic=20Cloud,=20although=20a=20=
scenario=20involving=20low-rate=20accretion=20onto=20a=20compact=20=
object=20is=20also=20possible.=20The=20O=20Ia=20star=20lies=204.4=20pc=20=
in=20projection=20from=20the=20Quintuplet=20cluster,=20and=20has=20a=20=
radial=20velocity=20consistent=20with=20that=20of=20the=20Quintuplet,=20=
suggesting=20that=20this=20star=20might=20have=20escaped=20from=20the=20=
cluster.=20We=20also=20present=20the=20discovery=20of=20a=20B2=20Ia=20=
supergiant,=20which=20we=20identified=20as=20a=20candidate=20massive=20=
star=20using=208=20$\micron$=20$Spitzer$=20maps=20of=20the=20Galactic=20=
center=20in=20a=20region=20near=20the=20known=20massive=20X-ray-emitting=20=
star=20CXOGC=20J174516.1-290315.=20=20We=20discuss=20the=20origin=20of=20=
these=20stars=20in=20the=20context=20of=20evolving=20stellar=20clusters=20=
in=20the=20Galactic=20center.=20=0A=20=0A\end{abstract}=0A=0A=
\end{document}=

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