Discovery of periodic oscillations in AM Herculis during an intermediate brightness state

Details Discovery of periodic oscillations in AM Herculis during an intermediate brightness state Discovery of periodic oscillations in AM Herculis during an intermediate brightness state

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l..27b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. L27-L30.

Astronomy and Astrophysics

Astrophysics

11

Stellar Luminosity, Stellar Mass Accretion, Stellar Oscillations, White Dwarf Stars, Astronomical Spectroscopy, Light Curve, Periodic Variations, Power Spectra

Scientific paper

The discovery of regular (about 4.5 minutes) strong oscillations in the optical flux of the binary system AM Herculis is reported. Spectroscopic data obtained with high time resolution at the 6-m Soviet telescope in July 1989 when the source has declined to a magnitude of 14.2, reveal large amplitude (up to 60 percent) fluctuations which persist over most of the orbital cycle. A detailed temporal analysis shows the fluctuations to be nearly closely periodic with a period steadily increasing from 250 s to 280 s during the 3.5 hour observations. This is the first evidence that the (5-10 minutes) flickering often observed in AM Her systems may consist of the superposition of regular periodic oscillations. The spectral changes associated with the oscillations are small, similar amplitude being observed in both continuum and emission lines. Possible interpretations are discussed here in terms of mass accretion instability arising at the capture radius.

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