|Evolution of water emission in intermediate mass YSOs
|Intermediate mass YSOs are studied as part of the WISH KP. We find our source sample is too limited to identify properties associated with stellar evolution. With this proposal we ask for time to observe two more intermediate mass YSOs with HIFI and PACS. When looking at line profiles among or source set a confused picture appears. NGC 7129 FIRS 2 and LDN 1641 are both Class 0 YSOs but have very different line profiles. Similarly, the Vela sources are both Class I sources and even have almost the same bolometric luminosity but display very different spectra. It is noteworthy that line profiles of the Class 0 NGC 7129 FIRS 2 are very similar to the line profiles of the Class I Vela IRS 17. Furthermore, the most evolved source, AFGL 490, is most similar, albeit brighter, to one of the least evolved sources, LDN 1641. We require more observations in order to assess if there is any relation in line profile with evolutionary state. We ask for time to observe the Class 0 intermediate YSO, Cep E-mm, and the Class I-II sources, LkHa 224.
|HIFI_HifiPoint_dbs, HIFI_HifiPoint_load, HIFI_HifiMapping_fly, PACS_PacsLineSpec_point
|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, OT2_cmccoey_3, SPG v14.2.0. https://doi.org/10.5270/esa-73dlzy1