000002134 001__ 2134
000002134 005__ 20160701171659.0
000002134 0247_ $$2DOI$$a10.1093/mnras/stu1317
000002134 037__ $$aASTROimport-291
000002134 100__ $$aGolriz, S. S.
000002134 245__ $$aInfrared spectroscopy of asymptotic giant branch stars in the Galactic bulge
000002134 260__ $$c2014
000002134 520__ $$aWe have selected a homogeneous sample of asymptotic giant branch (AGB) stars in the Galactic bulge population from the ISOGAL survey. Our target stars cover a wide range of mass-loss rates (˜10-8-10-4 M⊙ yr-1) and differ primarily by their age on the AGB. This homogeneous sample is thus ideally suited to study the dust formation process as a function of age on the AGB. We observed our sample with Spitzer-Infrared Spectrograph, and studied the overall properties of the infrared spectra of these targets. The analysis is complicated by the presence of strong and variable background emission, and the extracted infrared AGB star spectra are affected by interstellar extinction. Several stars in our sample have no detectable dust emission, and we used these `naked stars' to characterize the stellar and molecular contributions to the infrared spectra of our target stars. The resulting dust spectra of our targets do indeed show significant variety in their spectral appearance, pointing to differing dust compositions for the targets. We classify the spectra based on the shape of their 10-µm emission following the scheme by Sloan  Price. We find that the early silicate emission classes associated with oxide dust are generally under-represented in our sample due to extinction effects. We also find a weak 13-µm dust feature in two of our otherwise naked star spectra, suggesting that the carrier of this feature could potentially be the first condensate in the sequence of dust condensation. 
000002134 700__ $$a Blommaert, J. A. D. L.
000002134 700__ $$a Vanhollebeke, E.
000002134 700__ $$a Groenewegen, M. A. T.
000002134 700__ $$a Habing, H. J.
000002134 700__ $$a Kemper, F.
000002134 700__ $$a Schultheis, M.
000002134 700__ $$a Tielens, A. G. G. M.
000002134 700__ $$a Waters, L. B. F. M.
000002134 700__ $$a Wood, P. R.
000002134 700__ $$a Cami, J.
000002134 773__ $$c3402-3434$$i4$$pMonthly Notices of the Royal Astronomical Society$$v443$$y2014
000002134 85642 $$ahttp://esoads.eso.org/abs/2014MNRAS.443.3402G
000002134 905__ $$apublished in
000002134 980__ $$aREFERD