1998/10/15 by A. J. Norton, A. P. Beardmore, Norton, A. J. +1
Computer Science · Physics and Astronomy · Social Sciences · #Astrophysics (astro-ph) #Digital Communication and Language #FOS: Physical sciences #Linguistic Variation and Morphology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9810234
4 pages, 2 figures, submitted to MNRAS
arxiv created 1998/10/15 · openalex publication_date 1998/10/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the results of a long ROSAT HRI observation of the candidate intermediate polar TW Pic. The power spectrum shows no sign of either the previously proposed white dwarf spin period or the proposed binary orbital period (1.996 hr and 6.06 hr respectively). The limits to the X-ray modulation are less than 0.3% in each case. In the absence of a coherent X-ray pulsation, the credentials of TW Pic for membership of the intermediate polar subclass must be suspect. We further suggest that the true orbital period of the binary may be the shorter of the two previously suggested, and that the longer period may represent a quasi-periodic phenomenon associated with the accretion disc.