0Assigned ID: 590
----- Attempting Submission 1 (Fri Apr 10 17:12:31 GMT 2015) -----If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
INEFFICIENT ORDERING OF FP-POS POSITIONS
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.
If the target coordinates are not known to 0.4" (or better), an ACQ/SEARCH should precede the ACQ/IMAGE.Change in acq. strategy of visits 7 and 8.
Use MIRROR-B because of BOT concerns.1619452078----- Attempting Submission 1 (Thu Jul 23 14:43:45 GMT 2015) -----
----- Attempting Submission 2 (Tue Oct 13 15:16:08 GMT 2015) ------ Warning (Form) If the target coordinates are not known to 0.4" (or
better), an ACQ/SEARCH should precede the ACQ/IMAGE.
--> The catalog I'm using claims to be ok within 0.3'' (and I've said
so in the apt).
- Warning (Orbit Planner) INEFFICIENT ORDERING OF FP-POS POSITIONS
--> I checked with the orbit planner that the FP-POS change is
hidden in the occultation period.
My PC has authorized submission with this warnings.The winds of the most Fe-poor massive stars of the Local Group: Sextans-ARadiation driven winds (RDWs) dominate the lives of massive stars and are a key ingredient of current calculations for their evolution and feedback. Their strong metallicity dependency has been positively tested with Milky Way, LMC and SMC stars. However, the 0.2Fe_sun frontier set by the SMC must be crossed before the theoretical prescriptions can be extrapolated to the early Universe. Recent studies that targeted Local Group oxygen-poor irregular galaxies to this aim were futile, as later on these systems were found to have an SMC-like content of iron. The outcome is that RDW theory is still to be tested in genuinely iron-poor environments.
We request low resolution COS FUV spectra of resolved OB stars in Sextans-A, the most iron-poor galaxy of the Local Group with 0.1Fe_sun or smaller. The resulting dataset will allow us to characterize the winds of truly iron-poor massive stars.
The crucial role of UV spectroscopy to characterize RDWs at low metallicity cannot be overstated: it is the best and in most cases only provider of diagnostics for the wind terminal velocity in the entire electromagnetic spectrum, and contains sensitive enough lines to constrain mass loss rates and iron content. This proposal builds on the team's previous experience on HST-COS observations of resolved OB stars beyond the SMC.General strategy
----------------
This proposal consists of COS/FUV spectroscopy of 4 O-stars and 1 early-B supergiant
in the dwarf irregular galaxy Sextans A (at ~1Mpc).
All targets are visited at least twice (except for target-2).
All visits consist of 2 or more orbits, to accumulate exposure time.
The configuration is COS/FUV, PSA, G140L, and central-lambda=1105, SEGMENT-A (B is off).
All FP-POS are used, but less Texp is given to FP-POS=1 since in this configuration
the blue edge of the P-Cygni of CIII1176 may be lost if the terminal velocity was high.
Acquisition strategy: ACQ/IMH
We checked that the sources are isolated in a radius of 2'',
and are the expected brightest source at 1300\AA within a r=3'' circle.
Phot. and astrometric catalogs:
---------------------------
Source for coordinates: Bellazzini+ 2014, A&A, 566, A44
They generated astrometry for Sextans A stars using 100 GSC2 stars in the field.
The rms of their solution is better than 0.3'' for both RA and DEC.
For 2 targets (OB326, OB521) Bellazzini+ did not provide coordinates. We used coordinates from Massey et al. 2007
after checking the positive agreement (within 0.1'') for the stars in both catalogs.
Source for optical photometry: Massey+ 2007, AJ, 133, 2393
Flux at 1300 Angstroems
---------------------
The fluxes at 1300\AA were estimated with COS's ETC using:
- optical photometry (V-magnitude, and B-V colors for extinction)
- Castelli & Kurucz models of the appropriate spectral type
- LMC-2 supershell extinction law applied before normalization by V-magnitude
Orient angles:
--------------
When checking HST archival images, some stars seemed to show very-faint nearby sources, unresolved even for HST.
The ORIENT angles were set to prevent that the main and secondary sources were aligned in the dispersion
direction:
The angle of alignment plus-minus 10 degrees was removed from the available orientations.
We checked that the visit schedulability was not altered by the Orient angles.
The alignment angles, measured from North to East with North being angle=0 are:
OB521, 267deg
OB523, 99 and 356 deg
OB622, 85.2deg
BOT checks:
-----------
2 sets of modern UV observations are available for the target stars:
- GALEX fully covers the whole host galaxy Sextans-A
- Archival WFPC2-F170W images for part of the galaxy, from the treasury program HST-11079 (PI Bianchi).
Catalog of sources: J/AJ/143/74/table4. See Bianchi+ 2012, AJ, 143, 74
We ran APT's BOT tool, both with GSC2 and GALEX.
We checked that the GSC2-unknown targets are weak or no-show in GALEX or the archival WFPC2-F170W images.
BOT finds no unsafe objects except for target-3 ACQ/IMH, visits OB523-V1 and OB523-V2.
For target-3 ACQ/IMH, visits OB523-V1 and OB523-V2, there is 1 GALEX-unsafe object.
GALEX cannot resolve the area where the target is located, and encloses the whole OB association.
However, this area is resolved at the WFPC2-F170W images.
We registered the F225W magnitudes (F170W mags. not available) of stars in the r=22'' circle enclosing Aladin-BOT checks,
and our target (which is safe according to the ETC) is the brightest source with F225W=17.18.
Note that we couldn't input these numbers into the ETC for checks, as the ETC does not ingest WFPC2 photometry.
We also checked with the ETC that nearby (within r=3.5'') and program stars
do not exceed the safety limits with the used exposure times,
both for acquisition and spectroscopy,
in the worst-case-scenario:
. Kurucz of earliest spectral type O5V
. flux normalized to V-magnitudes
. *unreddened*
. maximum used Texp time (1410s for spectroscopy, and the appropriate one for acq)
There is an apparent offender for the visits on target-3, with V=18.771.
However, it has WFPC2-F225W=17.93, more than 0.7mags fainter than target-3 (which is safe).
This star does *not* coincide with the GALEX offender for target-3.HOT STARS12falsetruefalsefalseSUPPORTEDEXT-STARGIANT ONOSEXTA-OB326J2000J2000*TYPE=O7.5III*, B-V = -0.265, E(B-V) = 0.06, F-CONT(1300) =1.2E-15EXT-STARGIANT ONOSEXTA-OB521J2000J2000*TYPE=O9.5III*, B-V = -0.259, E(B-V) = 0.05, F-CONT(1300) =4.0E-15EXT-STARSUPERGIANT ONOSEXTA-OB523J2000J2000*TYPE=O9.5I*, B-V = -0.231, E(B-V) = 0.10, F-CONT(1300) =2.5E-15EXT-STARSUPERGIANT ONOSEXTA-OB321J2000J2000*TYPE=O9.7I*, B-V = -0.248, E(B-V) = 0.06, F-CONT(1300) =3.0E-15EXT-STARB0-B2 III-INOSEXTA-OB622J2000J2000*TYPE=B0I*, B-V = -0.099, E(B-V) = 0.12, F-CONT(1300) =1.7E-15COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105The scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.1449851578000294.740018245424(Tic-Visit
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:low-sky "N"
:pcs-visibility 3210
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14245
:visit-id "10"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2988.0
:al-overhead-at-end 0
:internal-dur-at-end 331.0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3210
:pcs-gap 0
)true30