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From: Kin-Wing Chan 4-3118  kwc@ssa1.arc.nasa.gov 
To: gcnews@aoc.nrao.edu
Subject:Abstract submission

%astro-ph/9807294
 
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\title{The Nature of the Mid-Infrared Background\\
    Radiation in the Galactic Bulge\\
    from the IRTS Observations}

\author{Kin-Wing Chan and T. L. Roellig}
\affil{NASA/Ames Research Center, MS 245--6, Moffett Field, CA 94035; 
kwc@ssa1.arc.nasa.gov, roellig@ssa1.arc.nasa.gov}

\author{T. Onaka and I. Yamamura\altaffilmark{1}}
\affil{Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113; 
onaka@apsun4.astron.s.u-tokyo.ac.jp, yamamura@astron.s.u-tokyo.ac.jp}

\and

\author{T. Tanab\'e}
\affil{Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181; 
ttanabe@mtk.ioa.s.u-tokyo.ac.jp}

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\altaffiltext{1}{present address:  Astronomical Institute ``Anton Pannekoek'', 
    University of Amsterdam, Kruislaan 403, NL-1098SJ, Amsterdam, the 
    Netherlands}

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\begin{abstract}
Using the Mid-Infrared Spectrometer (MIRS) on board the Infrared Telescope in 
Space (IRTS)
we obtained the 4.5 to 11.7 $\mu$m spectra of the stellar populations and 
diffuse interstellar medium in the Galactic bulge (${l}$ $\approx$ 
8.7$^{\circ}$, ${b}$ $\approx$ 2.9, 4.0, 4.7, and 5.7$^{\circ}$). Below galactic
latitudes of 4.0$^{\circ}$, the mid-infrared background spectra in the bulge are 
similar to the spectra of M and K giants. The UIR emission bands (6.2, 7.7, 8.6, 
and 
11.3 $\mu$m) are also detected in these regions and likely arise
from the diffuse interstellar medium in the disk. Above galactic latitudes of
4.0$^{\circ}$, the mid-infrared background spectra are similar to the spectra
of those oxygen-rich evolved stars with high mass-loss rates detected by IRAS. 
One likely
interpretation is that this background emission arises predominantly from those
stars with very low luminosities that have not been detected by IRAS. The
age for such low-luminosity evolved stars could be
15 Gyr, and the existence of a large number of evolved stars with high mass-loss 
rates in the bulge has a significant impact on our understanding of the stellar 
content in the Galactic bulge. 
\end{abstract}



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