New detections of H2O masers in planetary nebulae and post-AGB stars using the Robledo-70m antenna
| العنوان: | New detections of H2O masers in planetary nebulae and post-AGB stars using the Robledo-70m antenna |
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| المؤلفون: | O. Morata, José-Luis Gómez, O. Suarez |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Physics, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Declination, Planetary nebula, law.invention, Stars, Space and Planetary Science, law, Maser, Antenna (radio) |
| الوصف: | Aims: We investigated the possible relationship between the evolutionary stage of post-AGB stars and planetary nebulae (PNe) and the presence of water masers in their envelopes. Methods: We have used NASA's 70-m antenna in Robledo de Chavela (Spain) to search for the water maser transition at 22235.08 MHz, towards a sample of 105 sources with IRAS colour characteristic of post-AGB stars and PNe at declination >-32 deg. 83% of the sources in the sample are post-AGB stars, 15% PNe or PN candidates, while only 2% seem to be HII regions. Results: We have detected five water masers, of which four are reported for the first time: two in PNe (IRAS 17443-2949 and IRAS 18061-2505), a ``water fountain'' in a post-AGB star (IRAS 16552-3050), and one in a source previously catalogued as a PN, but whose classification is uncertain (IRAS 17580-3111). Conclusions: The unexpected detections of water masers in two objects among the small subset of PNe led us to suggest that the PNe harbouring water masers are a special type of massive, rapidly evolving PNe. 15 pages, 7 figures. Accepted for publication in Astronomy and Astrophysics |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::863115d23a5cf033dc39e7b79114a5dd http://arxiv.org/abs/astro-ph/0703502 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....863115d23a5cf033dc39e7b79114a5dd |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |