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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2014
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57131044016 |
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Table of Contents:
- A SENSITIVE SEARCH FOR METHANOL LINE EMISSION TOWARD EVOLVED STARS José F. Gómez Lucero Uscanga Olga Suárez J. Ricardo Rizzo Itziar de Gregorio-Monsalvo Física, Astronomía y Matemáticas ISM AGB AGB and post molecules — masers — stars We present a sensitive search for methanol line emission in evolved stars at 1 cm, aiming to detect, for the first time, methanol masers in this type of objects. Our sample comprised post-AGB stars and young planetary nebulae (PNe), whose mass-loss processes and circumstellar structures resemble those of young stellar objects (YSOs), where methanol masers are detected. Class I masers were searched for in 73 objects, whereas Class II ones were searched in 16. No detection was obtained. The non-detection of Class I methanol masers indicated that methanol production in dust grains and/or the enhancement of its gas-phase abundance in the shocked regions of evolved objects are not as efficient as in YSOs. We suggest that relatively more evolved PNe might have a better probability of harboring Class II masers. 2014 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57131044016 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.50