|The neutral disk of MWC349
|We wish to study the circumstellar disk of the bright radiostar MWC349 with the aim to infer the evolutionary state of this prominent but enigmatic massive stellar object. We propose to make a full wavelength range scan with PACS and with the SPIRE spectrometer in order to determine the continuum spectrum of the disk, especially in the ill determined or unexplored wavelength region centered on 200-300 microns where the emission from the ionized wind and the warm circumstellar dust are comparably strong. These spectral scans are at least 10x more sensitive than our ISO data, and permit a deep search for molecules like water and CO. The presence of water which is being found by Herschel in a range of accretion disks young stellar objects would be strong evidence for the nature of the MWC349 disk as due to accretion, whereas the absence of water is most easily explained if the disk results from mass loss in a strong stellar wind or ejection event. Our proposed investigation has thus the potential to resolve the half--century old question about the evolutionary state of MWC349.
|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 ,
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 ,
|SPIRE_SpireSpectrometer_, PACS_PacsRangeSpec_point, SPIRE_SpirePhoto_small
|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.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2012, OT1_cthum_1, SPG v14.2.0. https://doi.org/10.5270/esa-xxvvo55