| Name | OT2_dneufeld_6 |
| Title | Probing the mystery of water vapour in carbon-rich stars: a search for the H2-17O and H2-18O isotopologues of water toward IRC+10216 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342246477&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-0mbmaa2 |
| Author | neufeld, d. |
| Description | Using the HIFI instrument, we propose to investigate further the puzzling - but widespread appearance of water vapour in carbon-rich stars. Following up on our discovery that water vapour is present in the warm inner envelope of the carbon rich AGB star IRC+10216, we will carry out a sensitive search for the minor isotopologues, H2-17O and H2-18O. The abundances of these species will provide a critical test of competing models for the origin of the water vapour present in the inner envelope. If the production of water vapor is initiated by the photodissociation of CO by UV radiation, as proposed by Decin et al. (2010) and Agndez et al. (2010), then enhancements in the H2-17O/H2-16O and H2-18O/H2-16O ratios are expected; however, if non-equilibrium chemistry initiated by pulsationally-driven shock waves is responsible - an alternative mechanism proposed recently by Cherchneff (2011) - then no such enhancement will be observed. |
| Publication |
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| Instrument | HIFI_HifiPoint_dbs |
| Temporal Coverage | 2012-05-17T21:58:51Z/2012-05-18T10:13:44Z |
| 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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2012-11-18T10:11:03Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, neufeld et al., 2012, 'Probing the mystery of water vapour in carbon-rich stars: a search for the H2-17O and H2-18O isotopologues of water toward IRC+10216', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-0mbmaa2 |