{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T09:09:43Z","timestamp":1740128983950,"version":"3.37.3"},"reference-count":49,"publisher":"American Astronomical Society","issue":"1","license":[{"start":{"date-parts":[[2017,7,24]],"date-time":"2017-07-24T00:00:00Z","timestamp":1500854400000},"content-version":"vor","delay-in-days":4,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2017,7,24]],"date-time":"2017-07-24T00:00:00Z","timestamp":1500854400000},"content-version":"tdm","delay-in-days":4,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["ApJ"],"published-print":{"date-parts":[[2017,7,20]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We observe the high-mass X-ray binary (HMXB) BP Cru using interferometry in the near-infrared <jats:italic>K<\/jats:italic> band with VLTI\/GRAVITY. Continuum visibilities are at most partially resolved, consistent with the predicted size of the hypergiant. Differential visibility amplitude (<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>) and phase (<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>) signatures are observed across the He <jats:sc>i<\/jats:sc>\n                  <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> and Br<jats:italic>\u03b3<\/jats:italic> lines, the latter seen strongly in emission, unusual for the donor star\u2019s spectral type. For a baseline <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn4.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> m, the differential phase rms <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn5.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> corresponds to an astrometric precision of <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjaa79f1ieqn6.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>. We generalize expressions for image centroid displacements and variances in the marginally resolved limit of interferometry to spectrally resolved data, and use them to derive model-independent properties of the emission such as its asymmetry, extension, and strong wavelength dependence. We propose geometric models based on an extended and distorted wind and\/or a high-density gas stream, which has long been predicted to be present in this system. The observations show that optical interferometry is now able to resolve HMXBs at the spatial scale where accretion takes place, and therefore to probe the effects of the gravitational and radiation fields of the compact object on its environment.<\/jats:p>","DOI":"10.3847\/1538-4357\/aa79f1","type":"journal-article","created":{"date-parts":[[2017,7,24]],"date-time":"2017-07-24T17:13:43Z","timestamp":1500916423000},"page":"72","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":20,"title":["Submilliarcsecond Optical Interferometry of the High-mass X-Ray Binary BP Cru with VLTI\/GRAVITY"],"prefix":"10.3847","volume":"844","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0304-743X","authenticated-orcid":false,"given":"I.","family":"Waisberg","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3903-0373","authenticated-orcid":false,"given":"J.","family":"Dexter","sequence":"additional","affiliation":[]},{"given":"O.","family":"Pfuhl","sequence":"additional","affiliation":[]},{"given":"R.","family":"Abuter","sequence":"additional","affiliation":[]},{"given":"A.","family":"Amorim","sequence":"additional","affiliation":[]},{"given":"N.","family":"Anugu","sequence":"additional","affiliation":[]},{"given":"J. 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