RX J1016.9-4103: A new soft X-ray polar in the period gap

Details RX J1016.9-4103: A new soft X-ray polar in the period gap RX J1016.9-4103: A new soft X-ray polar in the period gap

1998-09-09

arxiv.org/abs/astro-ph/9809104v1

Astronomy and Astrophysics

Astrophysics

6 pages (aa style) incl. 6 figures; to be publ. in Astronomy & Astrophysics; also available from http://www.obs.aip.de/~jcg/pu

Scientific paper

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 615+/-150 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.

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