| Name | DDT_kjusttan_3 |
| Title | Determination of the initial masses for extreme OH/IR stars using isotopologues of H2O |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342271263&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-oyh9gfx |
| Author | European Space Agency |
| 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. These so-called extreme OH/IR stars are thought to originate from stars with initial mass of 5 solar masses or more. These stars are expcted to experience the process of hot-bottom burning which preferentially synthesizes 13C and destroys 18O relative to the more abundant isotope. From HIFI observations of two of these objects, we observed a lack of H2_18O in these objects. Our aim here is to underpin the hypothesis of the high-mass progenitor of these stars by observing three isotopologues of H2O using HIFI in six other similar objects. Herschel offers the last opportunity to observe these lines for years to come. |
| 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 | HIFI_HifiPoint_dbs |
| Temporal Coverage | 2013-04-29T05:56:39Z/2013-04-29T08:03:34Z |
| 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 | 2013-10-29T07:38:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2013, Determination Of The Initial Masses For Extreme Oh/Ir Stars Using Isotopologues Of H2O, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-oyh9gfx |