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Waisberg I., Dexter J., Pfuhl Oliver, Abuter Roberto, Amorim A., Anugu Narsireddy, Berger Jean-Philippe, Blind Nicolas, Bonnet H., Brandner W., Buron A., Clénet Yann, De Wit Willem-Jan, Deen Casey P., Delplancke-Ströbele F., Dembet Roderick, Duvert Gilles, Eckart Andreas, Eisenhauer Frank, Fédou Pierre, Finger Gert, García Paulo, Garcia López R., Gendron Éric, Genzel Reinhard, Gillessen S., Haubois Xavier, Haug Marcus, Haussmann Frank, Henning Thomas, Hippler Stefan, Horrobin Matthew, Hubert Zoltan, Jochum Lieselotte, Jocou L., Kervella Pierre, Kok Yitping, Kulas Martin, Lacour Sylvestre, Lapeyrere Vincent, Le Bouquin Jean-Baptiste, Léna Pierre, Lippa Magdalena, Merand Antoine, Müller Eric, Ott Thomas, Pallanca Laurent, Panduro Johana, Paumard Thibaut, Perraut Karine, Perrin Guy, Rabien Sebastian, Ramírez A., Ramos José Ricardo, Rau C., Rohloff Ralf-Rainer, Rousset Gérard, Sanchez-Bermudez J., Scheithauer Silvia, Schoeller Markus, Straubmeier Christian, Sturm Eckhard, Vincent Frédéric, Wank I., Wieprecht Ekkehard, Wiest M., Wiezorrek E., Wittkowski Markus, Woillez Julien M., Yazici Senol, Gravity Collaboration ..

Submilliarcsecond Optical Interferometry of the High-mass X-Ray Binary BP Cru with VLTI/GRAVITY

The Astrophysical Journal, 2017, vol. 844

Référence DOI : 10.3847/1538-4357/aa79f1
Référence ADS : 2017ApJ...844...72W

Résumé :

We observe the high-mass X-ray binary (HMXB) BP Cru using interferometry in the near-infrared K band with VLTI/GRAVITY. Continuum visibilities are at most partially resolved, consistent with the predicted size of the hypergiant. Differential visibility amplitude ({{Delta }}| V| ˜ 5 % ) and phase ({{Delta }}phi ˜ 2^\circ ) signatures are observed across the He I 2.059 mu {{m}} and Brgamma lines, the latter seen strongly in emission, unusual for the donor star's spectral type. For a baseline B˜ 100 m, the differential phase rms ˜ 0\buildrel{\circ}\over{.} 2 corresponds to an astrometric precision of ˜ 2 mu {as}. 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.

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