ORIENT restriction added per Contact Scientist request. ----- Attempting Submission 1 (Fri Oct 31 22:49:11 GMT 2008) ----- Phase II Proposal 11828 (11828_ph2.apt) successfully submitted. ----- Attempting Submission 2 (Wed Jun 10 21:58:28 GMT 2009) ----- Assigned ID: 514 ----- Attempting Submission 1 (Fri Mar 07 19:38:57 GMT 2008) ----- Phase I Proposal 514 (AMG_cyc17.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 07 23:05:37 GMT 2008) ----- Phase I Proposal 514 (AMG_cyc17.apt) successfully submitted. ----- Attempting Submission 3 (Sat Mar 08 00:45:05 GMT 2008) ----- Transitional disks have transformed most of the dust and gas in their inner regions into planetesimals or larger solid bodies. They are a rare, short-lived phase of PMS disk evolution and provide important physical insights and modeling constraints on disk and protoplanetary system evolution. We propose to observe two intermediate mass stars with transitional disks, HD135344B and Lk Halpha 330, using ACIS-S on Chandra and the COS FUV spectrograph on HST. We will use these spectra to determine the coronal, transition region, and upper chromospheric emission measure distribution, covering temperatures from 10,000 K to 10 MK, and then calculate the full X-ray/EUV/FUV radiation field for use in modeling its photoexcitation/photoionization effects on the disk structure.

The F8 pre-main-sequence star HD135344B (SAO206462) is to be observed using COS G160M/G130M during the 3 orbits allocated . HD130095 is visually bright with V = 8.71 and has very accurate coordinates from the Hipparcos/Tycho Catalogue. Its proper motion is small; the coordinates given in this Phase II proposal are already corrected for proper motion to 2000.0. ORIENT restriction added 2009 June 10 ----- ORIENT from 200 deg to 80 deg. --- as requested by Contact Scientist. This restriction avoids the possibility of HD135344A falling within the PSA. Our observational sequence is: Acquisition consists of a 2X2 ACQ/SEARCH followed by an ACQ/IMAGE. Five segments of G160M spectra fill the rest of Orbit 1 and all of Orbit 2. Orbit 3 contains three G130M exposures. For our acquistion we use BOA+MIRRORA and 10 second exposures. Using V=7.81 to normalize an F8V model shows thsi to be a safe combination (see COS ETC output COS85813-COS85816. The COS Spectroscopy ETC indicates no problems for G160M or G130M. The scientific feasibility rationale in our proposal was: No moderate or high resolution UV spectra in the 1200-1800 A spectral region exist for HD135344B. An 8.5 ksec FUSE observation of HD135344B is very helpful because it shows the presence of O VI and C III transition region emission lines and the fluxes of these lines can be used to estimate the feasibility of COS observations. The stronger O VI doublet line (1032 A ) has an integrated flux of 1.2 10^{-13} ergs cm^{-2}/s. For normal transition region temperature structure and solar abundances the integrated flux of the equivalent C IV 1548 A line should be about 3 times larger. Thus we expect a flux of 3 10^{-13} ergs cm^{-2}/s in the stronger C IV line. The O VI lines have a FWHM of 1 A and we expect the C IV line widths also to have FWHM well over 0.5 A --- this spreads the flux over more of the COS detector and significantly reduces the line peak flux density compared to that of an unresolved line. We intend to measure the FUV spectrum of HD135344B using a set of G160M and G130M settings to provide full spectral coverage between 1175 and 1775 A at a velocity resolution of 15 km/s . These spectra will provide well-resolved emission line profiles and the opportunity to search for evidence of absorption by molecular gas close to the star. COOL STARS 12 false 0.0 0.0 false false false false false SUPPORTED STAR F3-F9 PRE-MAIN SEQUENCE STAR PROTOPLANETARY DISK J2000 16 13 48.5585 -57 34 13.84 J2000 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. C:\Documents and Settings\Alex Brown\OP-cache\11828_ph2-v01.xml 1244670365203 (Tic-Visit :proposal-id 11828 :visit-id "01" :proposal-version -1 :trans-version "20080807" :date "10-Jun-2009 15:46:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 783056 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11828 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11828 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2972 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11828 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3111 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11828 :visit-id "01" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3111 :al-overhead-at-end 0 :internal-dur-at-end 362 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 3 0