/ftp/cats/aliases/M//MSS2012



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J/A+A/537/A2        8.6um imaging of 47 Tuc                  (Momany+, 2012)
The following files can be converted to FITS (extension .fit or fit.gz)
	table3.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/537/A2
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Beginning of ReadMe : J/A+A/537/A2 8.6um imaging of 47 Tuc (Momany+, 2012) ================================================================================ The VLT/VISIR mid-IR view of 47 Tucanae. A further step in solving the puzzle of RGB mass loss. Momany Y., Saviane I., Smette A., Bayo A., Girardi L., Marconi G., Milone A.P., Bressan A. <Astron. Astrophys., 537, A2 (2012)> =2012A&A...537A...2M ================================================================================ ADC_Keywords: Clusters, globular ; Photometry, infrared ; Photometry, HST Keywords: stars: mass-loss - stars: winds, outflows - stars: Population II - globular clusters: individual: 47 Tucanae (NGC 104) Abstract: There is an ongoing debate regarding the onset luminosity of dusty mass loss in population-II red giant stars. We present VLT/VISIR mid-infrared (MIR) 8.6um imaging of 47 Tuc, the centre of attention of a number of space-based Spitzer observations and studies. The VISIR high-resolution (diffraction limited) observations allow excellent matching to existing optical Hubble Space Telescope catalogues. The optical-MIR coverage of the inner core of the cluster provide the cleanest possible blending-free sampling of the upper 3mag of the giant branch. Our diagrams show no evidence of faint giants with MIR-excess. A combined near/mid-infrared diagram additionally confirms the near absence of dusty red giants. Dusty red giants and asymptotic giant stars are confined to the 47 Tuc long-period variable population. In particular, dusty red giants are limited to the upper one N8.6um magnitude below the giant branch tip. This particular luminosity level corresponds to  1000L_sun_, which was suggested in previous determinations to mark the onset of dusty mass loss. Interestingly, starting from this luminosity level we detected a gradual deviation between the colours of red giants and the theoretical isochrones. Description: Our observations were obtained using the VLT spectrometer and imager for the MIR (VISIR) currently located at the Cassegrain focus of UT3. These observations were carried out in service mode in the period between October 3, 2009 and January 30, 2010.