A dataset provided by the European Space Agency

Name GT2_vbujarra_6
Title Additional molecular observations in AGB and post-AGB objects
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342227160&instrument_name=HIFI&product_level=LEVEL0&compress=true
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http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342267160&instrument_name=HIFI&product_level=LEVEL0&compress=true

DOI 10.5270/esa-1vh5rjr
Author bujarrabal, v.
Description The study of shells around AGB and post-AGB stars with Herschel-HIFI is being very fruitful. Observations of molecular lines have yielded extremely rich information on these objects, particularly on their warm gas components, which are crucial to understand the nature of the nebulae and the late stellar evolution. Two guaranteed time projects, HIFISTARS and SUCCESS, have already obtained most of the originally proposed observations, yielding several hundreds of high-quality line profiles. But these results also indicate that some interesting observations were not proposed, because we could not imagine some unexpected results or because our samples were biased to previously well observed objects. We have realized that a small additional amount of time would significantly improve the existing data in three aspects: A) A few interesting O-rich AGB stars in the HIFISTARS sample were not observed in the strongest lines of H _2^{18} O and H _2^{17} O, which are in general found to be more intense than expected. B) We detected surprisingly strong and widespread NH _3 J,K=1,0-0,0 emission, but a proper analysis of these lines obviously requires data on higher-J lines. C) Our sample of post-AGB objects was biased towards northern sources, the best studied ones until now, but the proper exploitation of ALMA will require high-frequency data of southern nebulae. We are accordingly proposing a few HIFI GT2 observations of evolved stars that, in combination with already existing data, will significantly improve the reach and quality of the previously allocated GT1. The total telescope time necessary to obtain these additional spectra is only 12.5 hr.
Publication
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2011-08-13T11:35:21Z/2013-03-12T05:08:53Z
Version SPG v14.1.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-09-12T04:17:32Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-12T04:17:32Z, GT2_vbujarra_6, SPG v14.1.0. https://doi.org/10.5270/esa-1vh5rjr