AX J1740.2-2903: Optical Period Confirms Intermediate Polar Classification

Astronomy and Astrophysics – Astronomy

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Optical, X-Ray, Gamma Ray, Binaries, Cataclysmic Variables

Scientific paper

Following the optical identification of AX J1740.2-2903 reported in ATel #2664, we obtained time-series photometry in the R-band on 2010 June 17 UT for 2.3 hr, using the 1.3m McGraw-Hill telescope of the MDM Observatory. A strong periodic modulation is detected in these data at P = 622+/-7 s, which agrees with the X-ray period of P = 623+/-2 s in XMM-Newton data reported in ATel #2664.

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