Discovery of Quasi-periodic Oscillations in the AM Herculis Object BL Hydri

Details Discovery of Quasi-periodic Oscillations in the AM Herculis Object BL Hydri Discovery of Quasi-periodic Oscillations in the AM Herculis Object BL Hydri

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489..912m&link_type=abstract

Astrophysical Journal v.489, p.912

Astronomy and Astrophysics

Astronomy

9

Accretion, Accretion Disks, Stars: Individual Alphanumeric: H0139-68, Stars: Individual Constellation Name: Bl Hydri, Stars: Novae, Cataclysmic Variables, Stars: Oscillations

Scientific paper

We obtained high-speed optical photometry of the AM Her object BL Hyi at the Las Campanas Observatory and the Cerro Tololo Inter-American Observatory during 1989-1996. BL Hyi was in its faint-luminosity state in 1989; it subsequently brightened and was in its high-luminosity state for our 1994-1996 observations. We discovered broad, 0.2-0.8 Hz quasi-periodic oscillations (QPOs) and narrower QPOs superposed on the broad QPOs when BL Hyi was in its high-luminosity state. The broad QPOs had widths of Delta f/fp ~ 0.5-1 and rms pulsed amplitudes of ~1%-4%, where fp is the frequency of the QPO peak. The narrow QPOs had widths of Delta f/fp < 0.1 and rms pulsed amplitudes of less than 1%. BL Hyi showed stronger QPOs and was slightly brighter in 1994 than in 1995-1996. The amplitudes of the broad and narrow QPOs were modulated on the orbital period of the system; they were strongest during the bright orbital phase. BL Hyi is the fifth AM Her system to show the short-period QPOs discovered by Middleditch.

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