|Unveiling the evolutionary paths of the most massive stars through the study of their ejected nebulae
|Several important questions remain open regarding the latest stages of evolution of the most massive stars, in particular regarding the exact evolutionary paths between the various subtypes of O stars, LBVs and Wolf-Rayet stars, and the mass-loss history of these objects throughout their lives. In the framework of the MESS GTKP+GT1, we have obtained or will obtain PACS imaging of 9 massive star nebulae of various types (LBV, LBV candidate, OF-WN, Of?p, WR) and PACS spectroscopy of 4 of them. In this short follow-up proposal we want to obtain PACS line spectroscopy for 3 peculiar massive and evolved objects for which spectroscopy is lacking. In particular, these observations will allow to determine the elemental abundances in the nebulae as well as the mass of the neutral gas using the fine structure lines formed in the ionized gas and in the photo-dissociation region respectively.
|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, 2013, GT2_proyer_3, SPG v14.2.0. https://doi.org/10.5270/esa-j66byuz