Search for radiative pumping lines of OH masers - I. The 34.6 mu m absorption line towards 1612MHz OH maser sources
文献类型：期刊论文
| 作者 | He JH(何金华)1 ; Szczerba, R2; Chen PS(陈培生)1; Sobolev, AM3
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2005-04 |
| 卷号 | 434期号:1页码:201-211 |
| 关键词 | masers stars : AGB and post AGB stars : circumstellar matter radio lines : stars |
| ISSN号 | 0004-6361 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | He, JH (reprint author), CAS, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | The 1612 MHz hydroxyl maser in circumstellar envelopes has long been thought to be pumped by 34.6 mu m 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 mu m 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 mu m absorption line. Only 5 objects from the sample (3 red supergiants and 2 galactic center sources) are found to show clear 34.6 mu m 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 mu m 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GIANT BRANCH STARS ; IRAS POINT SOURCES ; OH/IR STARS ; MHZ SURVEY ; CIRCUMSTELLAR ENVELOPES ; INTERSTELLAR OH ; GALACTIC-CENTER ; LRS SPECTRA ; EMISSION ; MICROWAVE |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2005/16/aa0569-04/aa0569-04.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000228097300022 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4415]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, CAS, PO Box 110, Kunming, 650011, PR China 2.N. Copernicus Astronomical Center, Rabianska 8, 87-100 Torun, Poland 3.Astronomical Observatory, Ural State University, Lenin Street 51, Ekaterinburg 620083, Russia |
| 推荐引用方式 GB/T 7714 | He JH,Szczerba, R,Chen PS,et al. Search for radiative pumping lines of OH masers - I. The 34.6 mu m absorption line towards 1612MHz OH maser sources[J]. ASTRONOMY & ASTROPHYSICS,2005,434(1):201-211. |
| APA | He JH,Szczerba, R,Chen PS,&Sobolev, AM.(2005).Search for radiative pumping lines of OH masers - I. The 34.6 mu m absorption line towards 1612MHz OH maser sources.ASTRONOMY & ASTROPHYSICS,434(1),201-211. |
| MLA | He JH,et al."Search for radiative pumping lines of OH masers - I. The 34.6 mu m absorption line towards 1612MHz OH maser sources".ASTRONOMY & ASTROPHYSICS 434.1(2005):201-211. |
入库方式： OAI收割
来源：云南天文台
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