Circumstantial evidence for a blue supergiant companion of IGR J16465-4507

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infra-Red, Optical, X-Ray, Binaries, Transients

Scientific paper

The 2MASS counterpart to IGR J16465-4507 (ATEL #329) identified by Heras and Walter (ATEL #336) is also a bright star in the USNO B1.0 catalog, 0448-0520455, with the magnitudes shown in the table below. Its short outburst and high duty cycle of quiescence suggest a similarity with the systems XTE J1739-302 (ATEL #181,#182,#184,#186,#218) and IGR J17544-2619/1RXS J175428.3-262035 (ATEL #190,#191,#192,#194,#252, IAUC #8202).

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