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 https://doi.org/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 The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - II. Estimating radial velocity of SPIRE spectral observation sources . Scott Jeremy P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4894S ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - III. Line identification and off-axis spectra . Benson Chris S. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4906B ,
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 ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder I. The Spectral Feature Finder and Catalogue . Hopwood R. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4874H ,
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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-10-03T12:26:13Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, justtanont, k., 2013, OT2_kjusttan_2, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-yis9k40