The UV variability of the intermediate polars TW Pictoris (H 0534 - 581) and TX Columbae (1H 0542 - 407)

Details The UV variability of the intermediate polars TW Pictoris (H 0534 - 581) and TX Columbae (1H 0542 - 407) The UV variability of the intermediate polars TW Pictoris (H 0534 - 581) and TX Columbae (1H 0542 - 407)

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250...99m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 99-106.

Astronomy and Astrophysics

Astrophysics

12

Cataclysmic Variables, Stellar Radiation, Ultraviolet Emission, X Ray Binaries, Magnetic Stars, Stellar Mass Accretion, White Dwarf Stars

Scientific paper

UV observations of two X-ray sources suggested to be nonsynchronous magnetic cataclysmic binaries (TW Pic and TX Col) are reported. Each source was observed at different epochs with simultaneous optical photometry in one case (TW Pic). The UV spectrum of both sources is typical of intermediate polars, showing a blue continuum with strong N V, C IV, Si IV, and He II emission lines contributing for 7-10 percent of the UV flux. Both sources are variable, showing a variation of the integrated UV flux of about 1.5 (TW Pic) and 3 (TX Col). This UV variability is explained by a variation of the accretion rate in the case of TX Col and by the presence of an additional hot spot in the case of TW Pic. It is shown that TX Col exhibits abnormal emission line intensities, exhibiting a strong N V and a weak C IV line. It is proposed that this is the result of nonsolar abundances in the accreted matter from the companion.

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