High-speed multicolor photometry of V834 Centaurus

Details High-speed multicolor photometry of V834 Centaurus High-speed multicolor photometry of V834 Centaurus

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..315m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 315-320. Research sponsored by DOE, U.S. Navy, Resea

Astronomy and Astrophysics

Astrophysics

5

Astronomical Photometry, Binary Stars, Cataclysmic Variables, Dwarf Stars, Stellar Luminosity, Cyclotron Radiation, Light Curve, Power Spectra, Spectral Emission

Scientific paper

Results are presented of high-speed photometric observations of the Am Her object, V834 Centaurus which, during its high state, revealed the 0.3-0.9 Hz quasi-period oscillations (QPOs) with rms amplitudes of 3.3 +/-1.1 percent and 2.5 +/-0.8 percent in the V and R bands, respectively, while the U-band amplitude was consistent with zero on one night but was 2.5 +/-1.2 percent on the following night. The QPOs in the B band were always consistent with zero. The data were obtained on the nights of June 16-21, 1990, when the average V magnitude of V834 Cen was about 15.3, confirming the high-luminosity state. The dominance of the QPOs by V-band emission is in contrast to earlier studies by Larsson which found that the QPOs were dominated by emission in the B and R band, depending upon the luminosity state of V834 Cen. In all cases, the QPOs of V834 have frequencies of 0.3-0.9 Hz. It is inferred that the color of the QPOs could be highly variable between luminosity states and may be variable in the U band within the high-luminosity state.

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