0Assigned ID: 430
----- Attempting Submission 1 (Fri Apr 11 11:59:02 GMT 2014) -----Updated slit for targets 4 and 5-2099955244----- Attempting Submission 1 (Tue Jul 22 15:13:56 GMT 2014) -----
HST Phase II Proposal 13703 (lida-apt.apt) successfully submitted.
----- Attempting Submission 2 (Mon Nov 10 17:06:45 GMT 2014) -----
----- Attempting Submission 3 (Sat Nov 15 15:57:10 GMT 2014) -----
HST Phase II Proposal 13703 (13703-lmvel-hs.apt) successfully submitted.
----- Attempting Submission 4 (Mon Dec 08 21:58:26 GMT 2014) -----
HST Phase II Proposal 13703 (13703-resub2.apt) successfully submitted.
----- Attempting Submission 5 (Tue Dec 09 15:24:09 GMT 2014) -----0The donor star winds in High-Mass X-ray BinariesHigh-mass X-ray binaries (HMXBs) are essential astrophysical laboratories. These objects represent an advanced stage in the evolution of massive binary systems, after the initially more massive star has already collapsed in a supernova explosion, but its remnant, a neutron star or black hole, remains gravitationally bound. The stellar wind from the OB-type donor is partially accreted onto its compact companion powering its relatively high X-ray luminosity. Since HMXBs accrete from the stellar wind, parameters such as the donor's mass-loss rate, the velocity of the wind, and its clumpiness are of fundamental importance.
This proposal takes advantage of the unique capabilities of HST/STIS for UV spectroscopy. We focus on the most populous in the Galaxy class of those HMXBs where the stellar wind of the OB donor is directly accreted onto a neutron star. Recently, a new sub-class of HMXBs - "supergiant fast X-ray transients" - was discovered. It has been proposed that these enigmatic objects can be explained by the specific properties of their donor-star winds. The only way to validate or disprove this hypothesis is by a studying the wind diagnostics lines in the UV spectra of donor stars. The observations proposed here will, for the first time, provide the UV spectra of this important new type of accreting binaries. Our state-of-the art non-LTE expanding stellar atmospheres and 3-D stellar wind simulations allow thorough exploitation of the STIS spectra. As a result we will obtain the wind parameters for a representative sample of six Galactic HMXBs, thus heightening our knowledge thereof considerably.An UV survey of a clean sample consisting of six wind-fed HMXBs, including persistent X-ray sources as
well as supergiant fast X-ray transients. The program consists of a total of 9 HST orbits.
The observations will be performed with the E140M echelle grating centered at 1425 A, and recorded by the FUV MAMA detector.
For the UV-brightest targets we must choose the small 0.1 arcsec x 0.03 arcsec aperture in order to avoid the MAMA bright limit of the total count
rate per image.HOT STARSDefaultfalsetruefalsefalsefalseAVAILABLESTARB0-B2 III-ISFXTIGR-J11215-5952J2000J2000STARGIANT OHMXB4U-2206+543J2000J2000STARB0-B2 III-ISFXTIGR-J00370+6122J2000J2000STARSUPERGIANT OHMXB4U-1700-37J2000J2000STARB0-B2 III-IHMXBIGR-J11305-6256J2000J2000STARSUPERGIANT OSFXTIGR-J08408-4503J2000J2000STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/FUV-MAMASpectroscopicNoNoE140M1425The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode./tmp/OPVisit4497293836404602292.xml(Tic-Visit
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