EX Hydrae - A coordinated campaign of photoelectric photometry from four observatories

Details EX Hydrae - A coordinated campaign of photoelectric photometry from four observatories EX Hydrae - A coordinated campaign of photoelectric photometry from four observatories

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..325s&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 2, Feb. 1983, p. 325-331. Fonds de la Recherche Fondamentale Collective

Astronomy and Astrophysics

Astrophysics

28

Dwarf Novae, Eclipsing Binary Stars, Electrophotometry, Periodic Variations, Stellar Spectrophotometry, Variable Stars, Light Curve, Stellar Color, Stellar Rotation, White Dwarf Stars

Scientific paper

Results are presented of observations of the eclipsing dwarf nova EX Hya in the quiescent state using five telescopes from four observatories for a total of 146 h in April 1979. It is found that the trend of a decreasing orbital period, which was present up to 1976, did not continue and in 1979 the period had changed towards a slightly larger value. Confirmation is obtained for the strong and coherent 67 min modulation of the light curve and it is shown that the 67 min period decreases on a time scale of 10 to the 6th yr. The light maximum of the 67 min cycle is determined to coincide with the bluest u-b colors, which reveals a color amplitude of 0.10-0.15 m. It is concluded that the 67 min modulation is not caused by variable mass transfer rates and probably corresponds to the rotation of a moderately magnetized white dwarf (the 'intermediate polar' model).

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