1998/09/09 by J. Greiner, Jochen Greiner, Greiner, Jochen +2
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9809104
6 pages (aa style) incl. 6 figures; to be publ. in Astronomy & Astrophysics; also available from http://www.obs.aip.de/~jcg/publis.html
arxiv created 1998/09/09 · openalex publication_date 1998/09/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.