0 Assigned ID: 518 ----- Attempting Submission 1 (Fri Apr 11 15:04:48 GMT 2014) ----- HST Phase I Proposal 518 (sao.apt) successfully submitted. For the best data quality, it is strongly recommended that all four FP-POS positions be used when observing at a given COS CENWAVE setting. 0 ----- Attempting Submission 1 (Thu Jul 17 15:21:09 GMT 2014) ----- There is no constraints on using all FP-POS for the NUV. If we would do so, we would lose too much exposure time, so we prefer to use only one FP-POS for the NUV observations. SAO 244567 is an unusually fast evolving star. Within twenty years only, it has turned from a B-type supergiant into the central star of the Stingray nebula. Space and ground-based observations obtained over the last decades have revealed that its spectrum changes noticeably over just a few years, showing stellar evolution in real time. Previous analysis indicates it must be a low mass star and thus the observed fast evolution is in strong contradiction with canonical post-asymptotic giant branch (AGB) evolution. A late He-shell flash is able to account for the rapid evolution. This scenario would predict an evolution back to the AGB, e.g. a decrease of the effective temperature (which is already indicated by the FUSE observations in 2006) and an increase of luminosity. With COS spectroscopy we want to follow the evolution of the surface properties of SAO 244567 to verify this thesis. The very compact nebula of SAO 244567 makes it impossible to derive these parameters from optical spectra, because most of the photospheric lines are blended by nebular emission lines thus they are not suitable for a spectral analysis. The derived surface parameters will establish constraints for late thermal pulse evolutionary calculations. With these calculations we aim not only to explain the nature of SAO 244567, but they also will provide a deeper insight in the formation process of hydrogen deficient stars, which make up 25% of the post AGB-stars and white dwarfs. FUV (medium and low resolution) and NUV (low resolution) spectra of SAO244567 (star) shall be observed within 1 visit. Orbit 1 to 4: COS/PSA G130M with central wavelength 1222 A. One different FP-POS per orbit. Orbit 5: COS/PSA G140L with central wavelength 1280 A. COS/PSA G230L with central wavelengths 3360 A and 2635 A. HOT STARS Default false true false false false SUPPORTED STAR PLANETARY NEBULA CENTRAL STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 f_max(at 1200A) = 3.2*10^-13 erg cm^2 s^-1 A^-1, f_min (at 1200A) = 0.8 *10^-13 erg cm^2 s^-1 A^-1 COS/FUV Spectroscopic No No G130M 1222 COS/FUV Spectroscopic No No G140L 1280 COS/NUV Spectroscopic No No G230L 3360 COS/NUV Spectroscopic No No G230L 2635 1405610059522 C:\Users\Nicole\Documents\OP-cache\sao-v01.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13708 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "17-Jul-2014 17:14:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 6279216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13708 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13708 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3137 :al-overhead-at-end 0 :internal-dur-at-end 86 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3470 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13708 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3248 :al-overhead-at-end 0 :internal-dur-at-end 105 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3470 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13708 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3248 :al-overhead-at-end 0 :internal-dur-at-end 105 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3470 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13708 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3248 :al-overhead-at-end 0 :internal-dur-at-end 105 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3470 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13708 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3248 :al-overhead-at-end 0 :internal-dur-at-end 385 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3470 :pcs-gap 0 ) true 5 0