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From: Freitag Marc  freitag@tapir.caltech.edu 
To: gcnews@aoc.nrao.edu
Subject: submit abstract_SgrA.tex ApJL, accepted

From freitag@tapir.caltech.edu Sat Jun  7 16:25:52 2003
Date: Fri, 06 Dec 2002 11:32:29 +0100
From: Freitag Marc <freitag@tapir.caltech.edu>
To: gcnews@aoc.nrao.edu
Subject: submit abstract_SgrA.tex ApJL, accepted

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\title{Gravitational waves from stars orbiting the Sagittarius A$^\ast$ black hole}
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\author{Marc Freitag$^{1,2}$  \verb|<freitag@tapir.caltech.edu>|}

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$^1$ California Institute of Technology, Mail code 130-33, Pasadena, 
CA~91125, USA

$^2$ Astronomisches Rechen-Institut, M\"{o}nchhofstrasse 12-14, 
D-69120~Heidelberg, Germany
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\begin{abstract}
One of the main astrophysical processes leading to strong emission of
gravitational waves to be detected by the future space-borne
interferometer {\em LISA} is the capture of a compact star by a black
hole with a mass of a few million solar masses in the center of a
galaxy. In previous studies, main sequence stars were thought not to
contribute because they suffer from early tidal disruption.  Here we
show that, according to our simulations of the stellar dynamics of the
{Sgr~A$^\ast$} cluster, there must be one to a few low-mass main sequence
stars sufficiently bound to the central Galactic black hole to be
conspicuous sources in {\em LISA} observations. The probability that a
white dwarf may be detectable is lower than $0.5$ and, in spite of
mass segregation, detection of a captured neutron star or stellar
black hole in the center of the Milky Way is highly unlikely.
\end{abstract}
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