Spectroscopic observations of the eclipsing Polar MN Hya (RX J0929--24)

Details Spectroscopic observations of the eclipsing Polar MN Hya (RX J0929--24) Spectroscopic observations of the eclipsing Polar MN Hya (RX J0929--24)

1998-07-31

arxiv.org/abs/astro-ph/9807337v1

Astronomy and Astrophysics

Astrophysics

accepted by MNRAS, 7 pages, 5 figs

Scientific paper

10.1046/j.1365-8711.1998.02037.x

We present low--medium resolution optical spectroscopy of the eclipsing AM Her system MN Hya (RX J0929--24). We determine the magnetic field strength at the primary accretion region of the white dwarf to be 42MG from the spacing of cyclotron features visible during ~0.4--0.7. From spectra taken during the eclipse we find that the secondary has a M3--4 spectral type. Combined with the eclipse photometry of Sekiguchi, Nakada & Bassett and an estimate of the interstellar extinction we find a distance of ~300--700pc. We find unusual line variations at phase ~0.9: Halpha is seen in absorption and emission. This is at the same point in the orbital phase that a prominent absorption dip is seen in soft X-rays.

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