For our programme, we have requested to have as much overlap as possible between the Chandra and HST observations, as our science goal requires simultaneous observations. As I couldn't indicate this comment in the Phase-I form, I thought I could include this here, just in case. Thank you very much for your help. 843629901 Assigned ID: 7878 ----- Attempting Submission 1 (Tue Sep 22 21:01:31 GMT 2026) ----- X-ray binaries are capable of producing powerful accretion disk winds. Winds have been detected in the X-rays (hot winds) as well as in UV/optical (cool winds). However, the connection between these winds is poorly understood, which is critical for our understanding of wind launching and their structure. The main limitation in establishing this connection, is the lack of simultaneous, multiwavelength studies. We propose a case study in the prototype target AC 211, using coordinated observations with Chandra and HST, to study the link between hot/X-ray and cool/UV disk winds, and the conditions in which they are formed. UV winds have been previously detected, but due to the location of AC 211, only the spatial resolution of Chandra/HETG can enable an X-ray wind study in this target. Dr. Stefanie Fijma is an expert on both X-ray and UV time-resolved spectroscopy of X-ray binaries, as well as X-ray binary winds. She has extensive experience with HST/STIS. Dr. Nathalie Degenaar is an expert on X-ray binaries, their outflows, as well as binary evolution. Moreover, she is an expert in Chandra/HETG analysis. Dr. Noel Castro Segura is an expert on time-resolved spectroscopy, X-ray binaries and their winds. He is also an expert in HST/STIS analysis. Dr. Fijma, Dr. Degenaar and Dr. Castro Segura will lead the data reduction and data analysis. Prof. Tom Maccarone is an expert on X-ray binaries and binary evolution. Both Prof. Maccarone and Dr. Degenaar will help with the interpretation of the data. Stellar Physics and Stellar Types 6 false false false false false false false true SECONDARY CHANDRA 24800068 false SUPPORTED This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 The scheduling data was generated by CASM 34.2. CASM was run in Phase I mode. STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/FUV-MAMA Spectroscopic No No G140L 1425