Follow-up observations of the remarkable double-degenerate binary LB 11146

Details Follow-up observations of the remarkable double-degenerate binary LB 11146 Follow-up observations of the remarkable double-degenerate binary LB 11146

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..722g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 701, p. 722-725

Astronomy and Astrophysics

Astronomy

21

Astronomical Spectroscopy, Binary Stars, H Alpha Line, Stellar Evolution, Time Series Analysis, White Dwarf Stars, Cross Correlation, Lyman Alpha Radiation, Stellar Magnetic Fields, Stellar Mass, Stellar Models, Stellar Spectra, Surface Temperature, Temporal Resolution

Scientific paper

LB 11146 is a double-degenerate binary system consisting of two white dwarfs of very similar mass and surface temperature, but widely different magnetic field strengths. In an attempt to constrain the possible evolutionary tracks of the object, time series H-alpha spectroscopy of the DA component was obtained with a time resolution as high as 11.5 min and total base line of 16 days. Cross-correlation analysis reveals no evidence of variation to a limit of K less than or approximately 20 km/s on periods of approximately 1 hr, effectively ruling out the possibility of future orbit decay by gravitational radiation to Type I supernova. However, both single-star and binary modes of past evolution are still viable. In addition, red spectroscopy was obtained to search for the highly displaced 2p0 to 3d-1 absorption component of H-alpha from the magnetic star, which is strong and nearly stationary at approximately 8500-8532 A in fields of 350-1200 MG. The detection of a deep feature near this location coupled with an identification of a displaced component of Ly-alpha in the IUE spectrum of the object confirm that hydrogen is present in the atmosphere of the magnetic component. Spectral modeling suggests a polar strength of approximately 670 MG (for dipolar geometry), but no model obtains a completely satisfactory fit, and at least one additional atmospheric constituent (neutral helium?) is required. Based on these conclusions, the magnetic component is reclassified as DAXP.

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