Testing the Falling Evaporating Bodies hypothesis on the Herbig star HD100546

Details Testing the Falling Evaporating Bodies hypothesis on the Herbig star HD100546 Testing the Falling Evaporating Bodies hypothesis on the Herbig star HD100546

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8300l&link_type=abstract

HST Proposal ID #8300

Physics

Hst Proposal Id #8300 Young Stars And Circumstellar Material

Scientific paper

It has been recently proposed that several Herbig stars exhibit spectroscopic variable features similar to those of the older, Main Sequence star, beta Pictoris, and by analogy attributed to evaporation of cometary-like bodies falling on to the star. The presence of such around Herbig stars is an important issue regarding the evolutionary timescales of planetary systems formation. However, this hypothesis is still controversial and needs to be tested. The only way to do so is to compare the observations with detailed, dedicated simulations, as we successfully did on beta Pictoris. This is also the only way to reliably estimate the physical {sizes, evaporation rates, etc} and orbital parameters of the suspected infalling bodies. We recently adopted this approach in one of the sofar most convincing cases of Herbig candidates for cometary infalls, namely HD100546, comparing IUE data with the predictions of our model. First tests could be done, eventhough limited, due to the lim it ed Signal/Noise provided by IUE and to the limited number of available data. Important differences have already been found between this object and beta Pictoris. We propose to record STIS data to test the cometary hypothesis for this star into more details and more quantitatively, from both dynamical and chemical points of view.

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