Waisberg, I., Dexter, J., Pfuhl, O., Abuter, R., Amorim, A., Anugu, N., Berger, J. P., Blind, N., Bonnet, H., Brandner, W., Buron, A., Clenet, Y., de Wit, W., Deen, C., Delplancke-Strobele, F., Dembet, R., Duvert, G., Eckart, A., Eisenhauer, F., Fedou, P., Finger, G., Garcia, P., Lopez, R. Garcia, Gendron, E., Genzel, R., Gillessen, S., Haubois, X., Haug, M., Haussmann, F., Henning, Th., Hippler, S., Horrobin, M., Hubert, Z., Jochum, L., Jocou, L., Kervella, P., Kok, Y., Kulas, M., Lacour, S., Lapeyrere, V., Le Bouquin, J. -B., Lena, P., Lippa, M., Merand, A., Muller, E., Ott, T., Pallanca, L., Panduro, J., Paumard, T., Perraut, K., Perrin, G., Rabien, S., Ramirez, A., Ramos, J., Rau, C., Rohloff, R. -R., Rousset, G., Sanchez-Bermudez, J., Scheithauer, S., Scholler, M., Straubmeier, C., Sturm, E., Vincent, F., Wank, I., Wieprecht, E., Wiest, M., Wiezorrek, E., Wittkowski, M., Woillez, J. and Yazici, S. (2017). Submilliarcsecond Optical Interferometry of the High-mass X-Ray Binary BP Cru with VLTI/GRAVITY. Astrophys. J., 844 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

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| similar to 5%) and phase (Delta phi similar to 2 degrees) signatures are observed across the He I 2.059 mu m and Br gamma lines, the latter seen strongly in emission, unusual for the donor star's spectral type. For a baseline B similar to 100 m, the differential phase rms similar to 0 degrees 2 corresponds to an astrometric precision of similar to 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Waisberg, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dexter, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pfuhl, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Abuter, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Amorim, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anugu, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berger, J. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blind, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonnet, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandner, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buron, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Clenet, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Wit, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deen, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Delplancke-Strobele, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dembet, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duvert, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eckart, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eisenhauer, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fedou, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Finger, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lopez, R. GarciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gendron, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Genzel, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gillessen, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haubois, X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haug, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haussmann, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hippler, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horrobin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hubert, Z.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jochum, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jocou, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kervella, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kok, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kulas, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lacour, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lapeyrere, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Le Bouquin, J. -B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lena, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lippa, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Merand, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muller, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ott, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pallanca, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panduro, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paumard, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perraut, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perrin, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rabien, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ramirez, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ramos, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rau, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rohloff, R. -R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rousset, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Bermudez, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scheithauer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholler, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Straubmeier, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sturm, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vincent, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wank, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wieprecht, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiest, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiezorrek, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wittkowski, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Woillez, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yazici, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-224836
DOI: 10.3847/1538-4357/aa79f1
Journal or Publication Title: Astrophys. J.
Volume: 844
Number: 1
Date: 2017
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
STELLAR WIND ACCRETION; GX 301-2; INFRARED-SPECTROSCOPY; SPECTRAL RESOLUTION; STARS; GX-301-2; LINE; HYPERGIANTS; CATALOG; GX301-2Multiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/22483

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