Simultaneous spectroscopy and photometry of the AM Herculis-like star H0139-68

Details Simultaneous spectroscopy and photometry of the AM Herculis-like star H0139-68 Simultaneous spectroscopy and photometry of the AM Herculis-like star H0139-68

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..140t&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 95, Feb. 1983, p. 140-146. Research supported by Dartmouth College.

Astronomy and Astrophysics

Astronomy

12

Binary Stars, Emission Spectra, Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, X Ray Sources, Balmer Series, Ephemerides, H Lines, Light Curve, Magnetic Stars, Radial Velocity, Spectral Energy Distribution, Stellar Mass Accretion, Stellar Spectra, Ubv Spectra

Scientific paper

We obtained one orbital cycle of spectroscopic and photometric data for the newly discovered AM Herculis-like object H0139-68. The light curve shows a flat-bottomed minimum and a flat-topped maximum, with decreasing amplitude toward shorter wavelengths. The spectrum shows strong emission lines of H, He I, and He II. The lines seem to consist of broad base and narrow peak components; the broad components have both higher γ velocities and higher K velocities than the peaks, and lead the peaks very slightly in phase. This behavior reflects asymmetries in the line profiles. Comparison of the line fluxes and the photometric data indicates that Balmer continuum emission contributes importantly to the flux in the C band. Although we are hampered by a lack of accurate polarization data, we interpret the available evidence as indicating that the white dwarf occults the accreting pole.

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