A dataset provided by the European Space Agency

Name OT1_jcernich_5
Title Molecular complexity in the circumstellar envelope of the O-rich evolved star VY CMa
URL

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DOI 10.5270/esa-7b72vyn
Author cernicharo, j.
Description Envelopes around evolved stars are factories of complex molecules (neutrals, anions and cations) and one of the main sites for dust formation. Most chemical studies have focused on C-rich envelopes, in particular on IRC+10216. Recent observations of metal bearing species and hydroxides in O-rich shells suggest that the chemistry in these objects can be as richer as in C-rich circumstellar envelopes. We propose to perform a complete line survey of the prominent O-rich star VY CMa with HIFI. This study will provide, in addition to all lines of CO, H2O, HCN, SiO, SO2, a complete inventory of the molecular gas in O-rich evolved stars. The comparison with the line survey of IRC+10216 (already carried out with HIFI-Herschel) will permit to distingush the different chemical processes in these objects and the subtle role of the C-O abundance ratio in the molecular composition of the gas at different distances from the central star. We will use our radiative transfer and chemistry models to reproduce the observed spectra and to derive molecular abundances. The data will also allow a better understanding of the physical structure of the envelope.
Publication Circumstellar ammonia in oxygen-rich evolved stars . Wong K. T. et al. . Astronomy & Astrophysics, Volume 612, id.A48, 37 pp. . 612 . 10.1051\/0004-6361\/201731873 . 2018A&A...612A..48W ,
Instrument HIFI_HifiFS_freq
Temporal Coverage 2011-09-14T17:24:03Z/2012-04-26T15:07:48Z
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 2012-10-26T12:05:26Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-10-26T12:05:26Z, OT1_jcernich_5, SPG v14.1.0. https://doi.org/10.5270/esa-7b72vyn