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• W2123031046 abstract "Maser lines of OH, H2O and SiO are commonly observed in O-rich asymptotic giant branch (AGB) stars, but their presence after the end of the AGB phase is linked to non-spherical mass-loss processes. IRAS 15452 − 5459 is a post-AGB star with an hourglass nebula whose maser lines are quite peculiar. We observed all of the three maser species with the Australia Telescope Compact Array with angular resolutions of 6, 0.6, 0.3 and 1.7 arcsec at 18 cm, 13 mm, 7 mm and 3 mm, respectively. While double peaks are routinely seen in OH and water masers and interpreted as due to expanding envelopes, only very few sources display SiO lines with a similar spectral profile. Our observations confirm the detection of the double peak of SiO at 86 GHz; the same spectral shape is seen in the lower J maser at 43 GHz. A double peak is also detected in the water line, which covers the same velocity range as the SiO masers. Thermally excited lines of SiO are detected at 7 and 3 mm and span the same velocity range as the maser lines of this species. Although observations at higher angular resolution are desirable to further investigate the spatial distributions of the maser spots, the current data allow us to conclude that the SiO masers are distributed in an hourglass shape and are likely due to the sputtering of dust grains caused by shock propagation. The complex OH profile would instead be due to emission from the fast outflow and an orthogonal structure." @default.
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• W2123031046 date "2013-07-05" @default.
• W2123031046 modified "2023-09-23" @default.
• W2123031046 title "Probing the fast outflow in IRAS 15452 − 5459 with ATCA observations of OH, H2O and SiO masers" @default.
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• W2123031046 doi "https://doi.org/10.1093/mnras/stt1039" @default.
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