| Name | OT2_edebeck_2 |
| Title | When twins are not identical: a HIFI scan of IRAS15194-5115, the stellar twin of IRC+10216 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250680&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-ttrm6vy |
| Author | de beck, e. |
| Description | Currently, our knowledge of the chemistry occurring in the stellaratmospheres and circumstellar envelopes of AGB stars is far from beingcomplete. A most powerful method to study the circumstellar chemistry isbroadband spectral scans of individual sources. We propose here toperform a spectral scan of the high mass-loss rate carbon starIRAS15194-5115 in selected HIFI bands. Lines will be identified andradiative transfer modelling will be performed for most of the detectedspecies to provide circumstellar abundances and isotope ratios. Theresults will be compared with those of similar spectral scans of othertypes of evolved objects, in particular IRC+10216, to address theefficiency of various chemical processes and their dependence on theevolution of the object. A comparison between isotope ratios determinedfor IRAS15194-5115 and IRC+10216 will be of special interest since thesestars have most likely taken different evolutionary paths along the AGB.The proposed observations will improve our understanding of AGB stars and theirrole in the chemical evolution of galaxies. |
| Publication | |
| Instrument | HIFI_HifiFS_freq |
| Temporal Coverage | 2012-09-05T20:05:52Z/2012-09-22T02:57:52Z |
| 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 | 2013-03-21T20:40:47Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, de beck et al., 2013, 'When twins are not identical: a HIFI scan of IRAS15194-5115 comma the stellar twin of IRC+10216', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-ttrm6vy |