The Circumstellar Environment of MWC297: ISO Results and FIRST Expectations

Details The Circumstellar Environment of MWC297: ISO Results and FIRST Expectations The Circumstellar Environment of MWC297: ISO Results and FIRST Expectations

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..353b&link_type=abstract

The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460

Physics

Stars: Individual: Mwc297, Stars: Mass-Loss-Circumstellar Matter

Scientific paper

The ISO SWS and LWS full grating spectra of the Herbig Be star MWC297 are presented. The spectra are dominated by a strong continuum; in addition, in the SWS range (2.3-45 microns), emission lines from the HI recombination series, PAH emission and absorption by solid CO2, H2O, and silicates have been observed while in the LWS spectrum (43-197 microns) [OI] and [CII] fine structure lines have been detected. The NIR-FIR data have been combined with ground based photometry to derive the spectral energy distribution (SED) from optical to radio wavelengths. The observed SED has been compared with the SED's computed with a spherical dusty envelope model parametrized by a density and temperature law in order to probe if such a circumstellar matter distribution is compatible with the observations, deriving also suitable values for the spectral type, the extinction and the distance. Consistent determination of the extinction and estimates of both the source mass loss rate and the size of the emitting ionized region have been derived by the analysis of the HI recombination lines of the Brackett, Pfund and Humphreys series observed by ISO together with Paschen and Brackett lines observed from the ground. The results are somewhat hampered by the large beam size of the ISO instruments. We show how the Photoconductor Array Camera and Spectrometer (spectral range 60 - 210 microns) on board the FIRST satellite, with its high spatial resolution (9.4 arcsec) will be able to improve our understanding of the physical conditions in the close neighbourhood of MWC297 and, more generally, to shed light on the distribution of the circumstellar matter around the Herbig Ae/Be stars.

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