0 Assigned ID: 5100 ----- Attempting Submission 1 (Sun Mar 24 00:40:50 GMT 2024) ----- HST Phase I Proposal 5100 successfully submitted. Receipt: # 5100-1 ----- Attempting Submission 2 (Tue Mar 26 17:16:32 GMT 2024) ----- Unschedulable Visit Unschedulable Visit It still says that it is unschedulable, but I'm told that this is a bug/glitch. -307140389 ----- Attempting Submission 1 (Mon Sep 09 06:19:01 GMT 2024) ----- ----- Attempting Submission 2 (Tue Apr 22 00:10:18 GMT 2025) ----- HST Phase II Proposal 17705 successfully submitted. Receipt: # 17705-2 ----- Attempting Submission 3 (Thu Apr 24 00:30:44 GMT 2025) ----- It is not schedulable in this version of APT, but I am told this is an APT glitch and that it is in fact schedulable. This proposal seeks to obtain deep STIS spectra of the extended ultraviolet Mg II emission recently discovered around the supermassive star Eta Carinae, with the longslit oriented across the flow direction, in both poles of the bipolar Homunculus Nebula. This will measure the expansion speed and velocity dispersion of this warm neutral gas, which will be combined with published proper-motion measurements to determine its tilt angle and deprojected outflow speed, and thus the 3D outflow structure. While density and mass-loss rate from Mg II emission alone are uncertain, spatially resolved velocity structure can be translated to approximate relative density and outflow speed as a function of latitude. These provide a unique probe of the radius, surface gravity, temperature, and rotation rate of the star that launched this wind. This is critical information for piecing together the physical properties of the unstable LBV star in the decades leading up to its eruption, and vital for constraining the physical interaction if it was a stellar merger event. LBVs more generally are hypothesized to be the products of mass transfer and mergers, but Eta Car is the only one for which this detailed pre-eruption information can be derived observationally. Understanding outer material into which ejecta expand is critical for the extended Eta Car system and hydrodynamics of bipolar nebulae more generally. Observational goal is to obtain long-slit STIS spectra of the Mg II 2800 AA line from ejecta immediately outside the bipolar Homunculus nebula in order to measure radial velocities along the slit, and hence, 3D kinematics in combination with proper motions already punlished. The STIS spectra use 4 CVZ orbits at each of two positions, 8 orbits total. Each position ois a separate visit. The slit centers are offset to the SE and NW (in the two polar directions) and the slit orientation is roughly perpendicular to the polar axis of the nebula, cutting across the polar axis. For each visit, we acquire on the central star, and then offset to the NW or SE. We do not perform a peakup, since the targets are nebulous and spread over a few arcsec. Both Smith and Morse are experts in studying Eta Carinae, and all team members are experts in studying emission line structures in H II regions like the Carina Nebula. All team members have extensive previous experience reducing and analyzing HST imaging and spectroscopy. Both Smith and Morse were co-investigators on the Eta Car Treasury project, and both have been PI on previous awarded HST studies of Eta Car. Dr. Nathan Smith has written over 30 refereed first author papers about Eta Carinae and its nebula, and has extensive experience with both HST imaging and spectroscopy. His PhD thesis used STIS to study Eta Carinae's nebula, and he has used HST STIS to study Eta Car and a number of other massive evolved stars with circumstellar nebulae since then. He is an expert in massive star evolution and mass loss, supernovae, and stellar eruptions. Dr. Jon Morse has also authored several papers on Eta Car using HST data, has extensive experience with analysis of UV and optical emission line spectroscopy and imaging, and was the project scientist for the COS spectrograph. He is an expert in UV and optical line emission shock diagnostics, massive star outflows, supernova remnants, and protostellar jets. Stellar Physics and Stellar Types 6 false true false false false false SUPPORTED ISM BIPOLAR OUTFLOW YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 ISM BIPOLAR OUTFLOW YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 STAR CIRCUMSTELLAR MATTER ETA CARINAE STAR YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STIS/CCD Spectroscopic No No G230MB 2794 STIS/CCD Spectroscopic No No G230MB 2794 POS-TARG DITHER 0.1 LINE false false 2 90.0 STIS-ALONG-SLIT 1 false 1745454393911 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/t7/ycrqvyps6fl_49m45dblccm00000gn/T/OPVisit13440751116744317830.xml STIS spectrum with slit oriented roughly perpendicular to the polar axis, offset to NW (Tic-Visit :proposal-id 17705 :visit-id "01" :proposal-version -1 :trans-version "20241216" :date "23-Apr-2025 17:26:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 294864 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17705 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 17705 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 21898 :al-overhead-at-end 121 :internal-dur-at-end 399 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 4 0 1745454449812 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/t7/ycrqvyps6fl_49m45dblccm00000gn/T/OPVisit5175802776039757305.xml STIS spectrum with slit oriented roughly perpendicular to the polar axis, offset to NW (Tic-Visit :proposal-id 17705 :visit-id "02" :proposal-version -1 :trans-version "20241216" :date "23-Apr-2025 17:27:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 294864 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17705 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 17705 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 21898 :al-overhead-at-end 121 :internal-dur-at-end 399 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 4 0