A dataset provided by the European Space Agency

Name OT2_kjusttan_2
Title Herschel observations of extreme OH-IR stars
URL

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DOI 10.5270/esa-yis9k40
Author justtanont, k.
Description A subset of Asymptotic Giant Branch (AGB) stars loses mass at a very high rate. The dust effectively shields the radiation from the central star, allowing water-ice to condense onto existing silicate grains. Through the mass loss process, these stars provide a siginificant fraction to the gas and dust mass return to the interstellar medium. They are thought to be massive intermediate-stars (>5 Msun), close to the end of their AGB evolution. Using Herschel to obtain the full spectral coverage from 50 to 670 micron with PACS and SPIRE, we will obtain spectra of gas-phase H2O lines and derive the H2O abundance by modelling these lines, thought to be the main cooling agent in O-rich AGB star. This, combine with a few selected high resolution observations of CO lines with HIFI will allow us to explore both the temperature and density structures of the circumstellar envelope (CSE). These observations will enable us to study the H2O abundance as a function of distance from the star as well as explore the superwind region close to the central star and detect any departure from spherical symmetry in the structure of the CSE. We will also get a handle on the stellar mass from 12C-13C and the wealth of the molecular emission lines in this wavelength range will be used to study the ongoing chemistry in highly obscured circumstellar envelopes of AGB stars.
Publication Herschel observations of extreme OH-IR stars. The isotopic ratios of oxygen as a sign-post for the stellar mass . Justtanont K. et al. . Astronomy & Astrophysics, Volume 578, id.A115, 38 pp. . 578 . 10.1051\/0004-6361\/201526270 . 2015A&A...578A.115J ,
Instrument SPIRE_SpireSpectrometer_, HIFI_HifiPoint_dbs, PACS_PacsRangeSpec_point
Temporal Coverage 2013-03-23T17:38:46Z/2013-04-03T13:21:55Z
Version SPG v14.2.0
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 2013-10-03T12:26:13Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-10-03T12:26:13Z, OT2_kjusttan_2, SPG v14.2.0. https://doi.org/10.5270/esa-yis9k40