The strange case of the 3 hour variation of Nova Cygni 1975

Details The strange case of the 3 hour variation of Nova Cygni 1975 The strange case of the 3 hour variation of Nova Cygni 1975

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..954p&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 954-962.

Astronomy and Astrophysics

Astrophysics

22

Light Curve, Novae, Periodic Variations, Stellar Models, Stellar Spectrophotometry, Ephemerides, Flicker, Mass Transfer

Scientific paper

Photometry of the remnant of Nova Cygni 1975 is presented. The 3.3-hour periodicity is found to be present through at least 1977 December, superposed on a light curve showing rapid flickering and erratic variation. The presence of flickering suggests that mass transfer plays a significant role in the nova eruption. From an analysis of all published data, the period of the 3.3 hour variation is found to have smoothly decreased by 2% in the first year after outburst, then increased by 1% in 1977. The spectroscopic observations of line profile variations are compared to the continuum ephemeris near maximum light. The period and phase of the variations are found to be in precise agreement, establishing that they have a common origin in the central object which powers the expanding nebula. Some constraints on models of the periodicity are discussed, but its origin remains unknown.

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