Water maser detections in southern candidate post-AGB stars and planetary nebulae
| العنوان: | Water maser detections in southern candidate post-AGB stars and planetary nebulae |
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| المؤلفون: | Olga Suarez, O. Morata, Luis F. Miranda, Yolanda Gómez, Guillem Anglada, José M. Torrelles, José-Luis Gómez |
| المصدر: | Astronomy & Astrophysics. 505:217-225 |
| بيانات النشر: | EDP Sciences, 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Physics, Stellar mass, Lower velocity, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Planetary nebula, Declination, law.invention, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, law, Asymptotic giant branch, Maser, Solar and Stellar Astrophysics (astro-ph.SR) |
| الوصف: | We intended to study the incidence and characteristics of water masers in the envelopes of stars in the post-AGB and PN evolutionary stages. We have used the 64-m antenna in Parkes (Australia) to search for water maser emission at 22 GHz, towards a sample of 74 sources with IRAS colours characteristic of post-AGB stars and PNe, at declination $< -32 ��$. In our sample, 39% of the sources are PNe or PNe candidates, and 50% are post-AGB stars or post-AGB candidates. We have detected four new water masers, all of them in optically obscured sources: three in PNe candidates (IRAS 12405-6219, IRAS 15103-5754, and IRAS 16333-4807); and one in a post-AGB candidate (IRAS 13500-6106). The PN candidate IRAS 15103-5754 has water fountain characteristics, and it could be the first PN of this class found. We confirm the tendency suggested in Paper I that the presence of water masers in the post-AGB phase is favoured in obscured sources with massive envelopes. We propose an evolutionary scenario for water masers in the post-AGB and PNe stages, in which ``water fountain'' masers could develop during post-AGB and early PN stages. Later PNe would show lower velocity maser emission, both along jets and close to the central objects, with only the central masers remaining in more evolved PNe. 11 pages, 5 figures. Accepted by Astronomy and Astrophysics |
| تدمد: | 1432-0746 0004-6361 2405-6219 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b3695bb12acc38da019dad398175b6d https://doi.org/10.1051/0004-6361/200911777 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....5b3695bb12acc38da019dad398175b6d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320746 00046361 24056219 |
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