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RX J1016.9-4103: a new soft X-ray polar in the period gap *
Jochen Greiner and
Received 18 August 1998 / Accepted 14 September 1998
We have discovered a new AM Her system as the optical counterpart of the ROSAT All-Sky-Survey source RX J1016.9-4103 ( 1RXS J101659.4-410332). The X-ray spectrum is very soft and the X-ray intensity is strongly modulated with the orbital period. Optical photometric and spectroscopic follow-up observations reveal a synchronously rotating binary with an orbital period of 134 min, placing RX J1016.9-4103 in the period gap. The strength of the TiO bands suggests a secondary spectral type later than M3 V and a distance of 615150 pc. Based on two clearly visible broad humps in the optical spectrum (interpreted as cyclotron features) a magnetic field strength of 52 MG is deduced thus proving the polar classification.
Key words: stars: individual: RXJ 1016.9-4103 novae, cataclysmic variables X-rays: stars
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Online publication: November 3, 1998