0 Assigned ID: 724 ----- Attempting Submission 1 (Fri Apr 08 19:34:21 GMT 2016) ----- HST Phase I Proposal 724 (fuvagb-cyc24.apt) successfully submitted. Receipt: # 724-1 ----- Attempting Submission 2 (Fri Apr 08 23:49:25 GMT 2016) ----- I have modified the buffer times for all visits to CONSERVATIVELY cover count rates as high as 12000 c/s shortened visit 3, by about 40s per orbit to fit in the previous plan windows 188296474 ----- Attempting Submission 1 (Thu Jul 21 00:12:56 GMT 2016) ----- ----- Attempting Submission 2 (Mon Sep 12 20:46:01 GMT 2016) ----- ----- Attempting Submission 3 (Tue Sep 13 17:53:15 GMT 2016) ----- Binarity and Accretion Activity in AGB Stars with Variable UV and X-Ray Emission The dramatic changes in the geometry and dynamics of the mass-ejection during the AGB-to-PN transformation are widely believed to be due to binarity and associated accretion processes, but observational probes are lacking. We propose to obtain multi-epoch UV spectra of two late-spectral-type AGB stars, Y Gem and EY Hya, that belong to a newly-discovered class of AGB stars showing strong and variable FUV fluxes ("fuvAGB" stars) and hard X-ray emission -- suggestive of variable accretion of matter onto an accretion disk in a binary system. The companions are either low-mass main-sequence stars or cold white dwarfs. The proposed study will provide robust confirmation of, and constraints on, our accretion-activity model for these objects. Y Gem and EY Hya represent the two main observational paths taken during post-AGB (pAGB) evolution: one leading to preplanetary nebulae (PPN) and the other to disk-prominent pAGB objects (dpAGB). Both dpAGBs and PPNe possess dusty circumstellar disks/torii, but, unlike dpAGBs, PPNs also show prominent extended nebulosities. We will fit the continuum to derive the temperature and size of the accretion hot-spot, and using CLOUDY modelling, fit the emission lines to provide constraints on the physical parameters of the accreting flow. The line profiles, if resolved, will reveal the nature of the companion stars. Our study will probe the early formation phase of bound disks in binary AGB stars, and provide valuable insights into the binary-induced accretion processes that make such disks, which have long been theorized to drive collimated outflows that produce aspherical morphologies in post-AGB objects. imaging survey of protoplanetary nebulae Stellar Physics Stellar Populations 12 false true false false false 0.0 0.0 false SUPPORTED STAR AGB STAR DISK EMISSION LINE STAR LONG PERIOD VARIABLE J2000 J2000 B=10.23, GALEX AB (FUV=14-16, NUV=14-15.9) ISM REFLECTION NEBULA J2000 J2000 B=10.73, GALEX AB (FUV=19.0, NUV=18.6) STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 POS-TARG DITHER 0.0861 LINE false false 2 90.0 STIS-ALONG-SLIT 1 false /private/var/folders/dv/kllm6qvx1m3bq_0v7lp6wwtc000702/T/OPVisit2420069510993478902.xml Timing link suitability includes constraints ([02 After 01 by 160.0 to 200.0 days]) The scheduling data was generated by CASM 24.2. 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