The period of the intermediate polar V1223 SGR

Details The period of the intermediate polar V1223 SGR The period of the intermediate polar V1223 SGR

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205p..57k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Nov. 1983, p. 57P-60P.

Astronomy and Astrophysics

Astronomy

10

Binary Stars, Stellar Mass Accretion, Stellar Spectrophotometry, Power Spectra, Stellar Evolution, Stellar Oscillations, Stellar Systems, White Dwarf Stars

Scientific paper

Photometry is reported for the close binary stellar system (intermediate polar) V1223 Sgr, tending to confirm the canonical model in which a rotating magnetized white dwarf accretes from a close companion via an accretion disk which is disrupted near its inner edge, giving rise to X-ray emission modulated at the white dwarf spin period. Many of the features discovered by Warner and Cropper are confirmed. An upper limit for the period change of the 794-sec oscillation of less than 2.3 x 10 to the -7th/yr is derived. Thus the accreting object has a moment of inertia too small to be a neutron star and is presumably a white dwarf. Observations were made with the No. 2 0.9-m telescope at Kitt Peak National Observatory in unfiltered light and with an integration time of 10 sec.

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