Unsupported characters were found in Abstract and replaced with |*| Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. Small GO Proposals are not allowed in Cycle 26 unless they are Joint Programs. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 33 ----- Attempting Submission 1 (Thu Aug 02 13:14:11 GMT 2018) ----- Joint HST/Chandra Denise: to remove lingering errors I had to activate the "Available" modes and check the "PC only" box...the "Available" modes allowed specification of non-standard wavecals incorporated in this program, as were done in the previous versions. The "PC only" was to correct a weird error concerning something about: "GS Acq Scenario may not be specified in Available mode. Please clear the value or change the mode. Legal mode(s) for this field: [PC Only]." The error appeared on the initial CCD ACQs, which have nothing to do with the GS, as far as I can tell...you probably know more about this than I do! 1324894414 ----- Attempting Submission 1 (Tue Aug 07 05:22:35 GMT 2018) ----- Somewhat erratic, unpredictable long-term starspot cycles of late-type stars are followed with highest sensitivity in coronal X-rays. Sun's high-energy modulations are crucial to Earth-impacting "Space Weather," as stellar counterparts are for their exoplanets. The decadal oscillations are symptomatic of a deep-seated magnetic pump -- the Dynamo -- whose internal workings remain elusive. Key question: is solar 11-year cycle normal, or instead a transition state? 3-year continuation of previous CXO/HST program is proposed for Alpha Cen AB (G2V+K1V) and Procyon (F5IV). Alpha Cen cycles bracket solar behavior, although true period of sunlike A is uncertain. So far, Procyon is a flat-liner. Shape of rise and fall of cycle is a key diagnostic, most clearly traced at high energies. HST part of the program will measure FUV subcoronal (T~100,000 K) emission lines, like Si IV 140 nm and C IV 155 nm, as well as the important NUV chromospheric (T~10,000 K) emission doublet of Mg II at 280 nm, in all three stars, with one visit of STIS echelle spectroscopy per system each year. Non-standard wavecals are used to provide better wavelength calibrations, so that subtle Doppler shifts of the high-excitation transitions can be assessed. Dynamical information also is incoded in distortions of the emission lineshapes, which are captured using a combination of FUV medium- and high-resolution echelle settings. This program builds on previous long-term Chandra/HST time series on both systems. The high-declination Alpha Cen system falls in the HST Continuous Viewing Zone numerous times during the year, allowing the two stars to be captured in a single visit of just two orbits. One such visit is planned for Cycle 26, compatible with the semiannual pointings by Chandra. There is no need to strictly coordinate the FUV and X-ray pointings, because the FUV Fe XII 124 nm coronal forbidden line can tie the STIS observation into the X-ray timeline. In the single HST/STIS visit, the binary companions are observed sequentially, beginning with Alp Cen A, brighter of the two. The target is acquired with the CCD and F25ND5, followed by an exposure with the E140M-1425 medium-res echelle through the photometric slot (0.2x0.2), which delivers R=40,000 and good sensitivity (peak S/N=40 per resol at the tops of the important Si IV 140 nm and C IV 155 nm resonance doublets). A peak-up is not needed because the CCD ACQ is accurate enough for centering in the photometric slot. The exposure depth is sufficient to capture the key Fe XII 124 nm coronal forbidden line, which as mentioned earlier is used to tie the STIS FUV measurements into the X-ray time series. The combination of resolution, spectral coverage, and sensitivity of E140M for A has proven successful in previous incarnations of this program. Following the E140M exposure, a peak-up is performed with the 31x0.05NDC slit in dispersed visible light with the CCD and G430M; then an E230H-2713 exposure is taken through that (long) slit. This setting captures the key chromospheric Mg II 280 nm resonance doublet. After the Alp Cen A exposures, a ~5" offset manuever to B is performed, followed by a CCD ACQ through F25ND5. The time-dependent separation of the binary companions is accurately known (to ~0.1"), based on orbital reconstructions of ten years of positional measurements by Chandra. Similarly, the coordinates and (an effective) proper motion of Alp Cen A were updated for Cycle 26 based on combining the orbital and proper motion solutions derived from the Chandra positions to trace out A's trajectory across the sky. After the CCD-ACQ of B, an E140H-1307 exposure is taken through the photometric aperture, followed by an E140H-1486. The previous STIS observations of B have shown that its FUV "hot lines" (like Si IV and C IV) are narrower than those of A, and display smaller Doppler shifts. Thus, B benefits from the higher resolution, with more precise wavelength scales, of E140H. The pair of E140Hs is the minimum needed to span the key region from Si III 120 nm up to beyond the C IV 155 nm doublet, with overlapping exposure at 140 nm, which covers Si IV as well as a density-sensitive multiplet of semi-permitted O IV. By using the 0.2x0.2 photometric aperture, sensitivity is maximized without significantly sacrificing resolution, as well as minimizing telescope "breathing" effects. The ~2x higher exposure depth for B in the key 1307/1489 overlap region is needed because, despite being chromospherically more active than A, B is fainter in apparent flux due to its smaller size. After the E140H exposures, an E230H-2713 is taken, again to cover the important Mg II region. The 0.2x0.09 spectroscopic aperture can be used, because the predicted Global Count Rate is below the bright limit (based on previous observations of the target with the same setup), and B is only minimally variable in the continuum light that dominates that setting (the Mg II lines can be more variable, but do not contribute signifcantly to the total flux in that region; and do not approach the local bright limit). A peak-up ensures maximum throughput. The whole FUV+NUV sequence for both stars requires two CVZ orbits. Also, because a tall slit is used for A, an ORIENT constraint is specified to avoid having both targets fall on the slit simultaneously, and consequently corrupt the echellegram with overlapping spectra (and possibly also violate the global limits). The constraint is not severe, however, because the NDC slit is only 0.05" wide and the separation of the stars will be >5" in 2019. A +/- 10 degree avoidance zone (+/- 0.9" pivot from B) should be sufficient to exclude B and any possible scattered light. The ORIENT avoidance zones for 2019 are listed in the Visit-level specifications. There are numerous CVZ windows throughout the year that satisfy the ORIENT constraints. The proposed STIS observations of Procyon are similar. There is one visit of two orbits, non-CVZ because of the low-declination target. The optically bright star is acquired by direct imaging with the CCD and F25ND5 filter. The ACQ is followed by a high-res FUV echelle exposure with setting E140H-1307 through the 0.2x0.2 photometric aperture, to fill out the first orbit. Second orbit begins with another high-res FUV echelle exposure, now with H-1489, again through the 0.2x0.2 slot. Together, these two settings cover the range from below Lyman Alpha (121 nm) out to beyond the C IV doublet at 155 nm, where the rising F-type photospheric continuum begins to overwhelm the faint subcoronal emission line spectrum. At the end of the second orbit, a brief NUV high-res echelle exposure is taken with setting E230H-2713 to capture the important chromospheric emission doublet of Mg II at 280 nm. Owing to the brightness of Procyon at these wavelengths, the observation must be taken through the ND2 slit, which requires a prior peak-up (in dispersed light with G430M). Non-standard lamp exposures are used for all the FUV and NUV settings of all three stars to provide accurate zero-point wavelength shifts for the respective echellegrams, given that the lamp output has faded over the years, and the default wavecals no longer are able to provide the desired accuracy. The deeper-than-normal wavecals ensure that the dispersion properties of the spectrometer are accurately monitored, to take full advantage of STIS's ability to measure small differential velocity shifts between emission lines formed in different environments in the stellar outer atmosphere, a major scientific goal of the project. The non-standard wavecals are forced to be adjacent to the respective science exposures by a "SEQ NON-INT" pairing. Because the GO-specified wavelength calibrations can substitute for the normal brief AUTO-WAVECALs, the latter are turned off in the respective science exposures. Stellar Physics 6 false false false false false false false AVAILABLE STAR CORONA G V-IV NO Target coords for epoch 2018.38 were based on a global orbital + proper-motion + parallax fit to ten years of Chandra X-ray positions. Alpha Cen AB are moving past their close approach (on the sky), which occurred in 2016, consequently the relative orbital motion of A has a significant influence on its apparent proper motion. ALP-CEN-A J2000 J2000 STAR CORONA K V-IV NO Offset of B relative to A, for 2019.5, was determined from the empirical ephemeris, designed to closely match the relative orbit as recorded by Chandra's High Resoultion Camera in recent years. ALP-CEN-B J2000 STAR CORONA F3-F9 NO Target coords for epoch 2019.5 were taken from SIMBAD, in ICRS frame. ALPHA-CMI PROCYON J2000 J2000 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1533617572599 (Tic-Visit :proposal-id 15618 :visit-id "10" :proposal-version -1 :trans-version "20180409" :date "06-Aug-2018 22:52:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 437568 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15618 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 15618 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 10548 :al-overhead-at-end 219 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 2 0 Castelli-Kurucz Models G2V 5750 4.5, renormalized to vegamag = 0.01 in filter Johnson/V: SNR~140 in 0.1 s; time to saturation 0.6 s. Input=special ETC file for ALP-CEN-A from previous STIS echelle spectra; exposure time= 1.5 ks at Si IV 139 nm gives peak SNR~40 (per resol) with 0.2x0.2 aperture. No LCR or GCR issues. Deeper than normal wavecal to determine accurate zero-point shift. Dispersed light peak-up; Castelli-Kurucz Model G2V 5750 4.5, renormalized to vegamag = 0.01 in filter Johnson/V: in 0.1 s with NDA, GCR= 2780k e-. ETC GCR~135k for Castelli-Kurucz Model G2V 5750 4.5, renormalized to vegamag = 0.01 in filter Johnson/V. Measured GCR~110k for several exposures in similar setting H-2812 with NDC; H-2713 GCR should be less because NUV continuum is falling toward shorter wavelengths. Deeper than normal wavecal to determine accurate zero-point shift. Castelli-Kurucz Models K2V 4750 4.5, renormalized to vegamag = 1.33 in filter Johnson/V: SNR~74 in 0.1 s; time to saturation 1.7 s. Based on new FUV spectrum of ALP-CEN-B from 4 years of STIS measurements. No LCR or GCR issues. Deeper than normal wavecal to determine accurate zero-point shift. Based on new FUV spectrum of ALP-CEN-B from 4 years of STIS measurements. No LCR or GCR issues. Deeper than normal wavecal to determine accurate zero-point shift. Dispersed light peak-up; Castelli-Kurucz Models K2V 4750 4.5, renormalized to vegamag = 1.33 in filter Johnson/V: 5470k e- in 0.1 s; time to saturation 0.9 s. GCR= 73k from ETC run for Castelli-Kurucz Model K2V 4750 4.5, renormalized to vegamag = 1.33 in filter Johnson/V. Variability expected to be very low in the K-dwarf continuum, which dominates the H-2713 setting. Measured GCRs from ocre10050, ocre11050, octr10050, and od5c10050 (same setting and slit) are 126k+/-13k. Deeper than normal wavecal to determine accurate zero-point shift. The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1544035320143 /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit16320933944011599012.xml (Tic-Visit :proposal-id 15618 :visit-id "11" :proposal-version -1 :trans-version "20181130" :date "05-Dec-2018 13:42:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 262544 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15618 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15618 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :al-overhead-at-end 219 :internal-dur-at-end 2051 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15618 :visit-id "11" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2843 :al-overhead-at-end 136 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) true 2 0 Castelli-Kurucz Model F5V 6500 4.0, renormalized to vegamag = 0.37 in filter Johnson/V: SNR~110 in 0.1 s; time to saturation 0.9 s. Input=special ETC file for ALP-CMI from previous STIS echelle spectra; exposure time= 2 ks at Si IV 139 nm gives peak SNR~30 (per resol) with 0.2x0.2 aperture. No LCR or GCR issues Deeper than normal wavecal to determine accurate zero-point shift. Deeper than normal wavecal to determine accurate zero-point shift. Input=special ETC file for ALP-CMI from previous STIS echelle spectra; exposure time= 2 ks at Si IV 139 nm gives peak SNR~40 (per resol) with 0.2x0.2 aperture. No LCR or GCR issues. Dispersed light peak-up for Castelli-Kurucz Model F5V 6500 4.0, renormalized to vegamag = 0.37 in filter Johnson/V: in 0.1 s, 477k e- with ND2 slit. Input=special ETC file for ALP-CMI from previous STIS echelle spectra; exposure time= 500 s at Mg II 279 nm gives peak SNR~30 (per resol) with ND2 aperture. No LCR or GCR issues. (ETC GCR ~60k; but, ~40k as measured from raw images in similar settings, also with ND2). Deeper than normal wavecal to determine accurate zero-point shift.