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A CoRoT View of the ζ Aur binary HR 6902: Poster on-line

  • C. Maceroni (a1), J. Montalbán (a2), R. Da Silva (a3) (a4), T. Semaan (a5), B. Mosser (a6), M. Rainer (a7), E. Poretti (a7) and E. Griffin (a8)...

Abstract

HR 6902 was the first target of a systematic study by Griffin (1986, JApA, 7, 195) of binaries showing composite spectra. It is also a well-studied member of the ζ Aur class. ζ Aur systems are long-period eclipsing binaries that are comprised of an evolved giant primary and a hot dwarf companion. Although those component stars have very different effective temperatures they have similar luminosities in the blue and near-UV regions, and hence display a composite spectrum at those wavelengths. In principle the ζ Aur systems are excellent tests of evolutionary and structural stellar models. In recent years the somewhat fragmentary eclipse photometry of HR 6902 has been out-classed by the high-precision continuous monitoring by the space mission CoRoT. HR 6902 was selected as a primary target of its seismology field, because the possible detection of solar-like pulsations in a giant component of a double-lined eclipsing binary could help to calibrate the scaling relation of giant pulsators. Our poster reported the results of a new analysis based on the CoRoT observations and follow-up spectroscopy with HARPS at the ESO 3.6-m telescope at La Silla.

The unprecedented accuracy of the CoRoT photometry enabled us to:

  • improve drastically the accuracy of the binary orbit and stellar parameters (by a factor ~10 for the radii)
  • extend the test of validity/calibration of the scaling relations to high stellar mass and radius, and put constraints on the evolutionary state (particularly since this binary is certainly free from tidal effects).

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For the full poster, see http://dx.doi.org/10.1017/S1743921318002910

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Supplementary materials

Maceroni et al. supplementary material
Maceroni et al. supplementary material

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A CoRoT View of the ζ Aur binary HR 6902: Poster on-line

  • C. Maceroni (a1), J. Montalbán (a2), R. Da Silva (a3) (a4), T. Semaan (a5), B. Mosser (a6), M. Rainer (a7), E. Poretti (a7) and E. Griffin (a8)...

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