Multiple Cyclotron Lines in V0332+53

Astronomy and Astrophysics – Astronomy

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X-Ray, Gamma Ray, Binaries, Neutron Stars, Pulsars, Transients

Scientific paper

As part of our continuing RXTE observing campaign of V0332+53 in outburst (ATEL #372, #371, #349), we obtained 63ks of good exposure time between 2004 December 24-26. We measured a 2-10keV flux of 2.6E-8 ergs/cm2/s with the PCA. In our RXTE spectrum, once a standard pulsar continua is fit there are clear, line-like residuals at ~25 and ~50keV. This is not surprising since Makishima et al. (1990, ApJ 356 59L) first reported a 28.5keV cyclotron line in the source using observations obtained with Ginga.

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