new outburst of Aql X-1

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infra-Red, Optical, Binaries, Neutron Stars, Transients

Scientific paper

Ongoing optical/IR monitoring of Aql X-1 with the SMARTS 1.3m telescope and ANDICAM instrument at CTIO show a steady rise over the past three days. Our most recent data show that on July 31, UT 5:08 (mid-exposure) the source was at R=17.8, J=16.1, compared to mean quiescent values of R=18.8, J=16.7. These magnitudes include the unrelated star 0.5" away (Chevalier et al. 1999 A&A 347, L51). Thus Aql X-1 appears to be initiating a new outburst.

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