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• W2141135251 abstract "The 1612 MHz hydroxyl maser in circumstellar envelopes has long been thought to be pumped by 34.6 μm photons. Only recently, the Infrared Space Observatory has made possible spectroscopic observations which enable the direct confirmation of this pumping mechanism in a few cases. To look for the presence of this pumping line, we have searched the Infrared Space Observatory Data Archive and found 178 spectra with data around 34.6 μm for 87 galactic 1612 MHz masers. The analysis performed showed that the noise level and the spectral resolution of the spectra are the most important factors affecting the detection of the 34.6 μm absorption line. Only 5 objects from the sample (3 red supergiants and 2 galactic center sources) are found to show clear 34.6 μm absorption (all of them already known) while two additional objects only tentatively show this line. The 3 supergiants show similar pump rates and their masers might be purely radiatively pumped. The pump rates of OH masers in late type stars are found to be about 0.05, only 1/5 of the theoretical value of 0.25 derived by Elitzur (1992). We have also found 16 maser sources which, according to the analysis assuming Elitzur's pump rate, should show the 34.6 μm absorption line but do not. These non-detections can be tentatively explained by far-infrared photon pumping, clumpy nature of the OH masing region or a limb-filling emission effect in the OH shell." @default.
• W2141135251 created "2016-06-24" @default.
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• W2141135251 date "2005-04-01" @default.
• W2141135251 modified "2023-09-27" @default.
• W2141135251 title "Search for radiative pumping lines of OH masers" @default.
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• W2141135251 doi "https://doi.org/10.1051/0004-6361:20040569" @default.
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