Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195l..15b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
61
Cataclysmic Variables, Cyclotron Radiation, Eclipsing Binary Stars, Stellar Magnetic Fields, White Dwarf Stars, Emission Spectra, Line Spectra, Stellar Spectrophotometry
Scientific paper
Low-resolution spectrophotometry (FWHM 20 A) of the recently discovered eclipsing AM Her binary EXO 033319-2554.2 was performed when the system was in as low, almost inactive state. The orbital period, defined by the total eclipses of 7.5 + or - 0.3-min width, is 0.08786539(1) days. The spectral flux contributed by the dM 4.5 secondary implies a distance of 240 + or - 50 pc. During the observations, only weak Balmer line emission was present, which came from the heated face of the secondary. The derived masses of the secondary and the primary are about 0.16 and greater than 0.93 solar mass (90-percent confidence), respectively. The magnetic nature of the primary is confirmed by the detection of intense cyclotron line emission during the bright phase (0.5 of the orbital period). The derived magnetic field strength in the main emission region on the white dwarf is 55 + or - 3 MG, which is the highest value found so far in an AM Her binary.
Beuermann Klaus
Schwope Axel
Thomas Hans-Christoph
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