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1981•Monthly Notices of the Royal Astronomical SocietyOpen access

Radial velocities for contact binary systems - I. W Ursae Majoris and AW Ursae Majoris

B. McLean

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Abstract

Radial velocity observations obtained by a numerical cross-correlation technique are presented for the two W Ursae Majoris type contact binaries W UMa and AW UMa. Spectroscopic mass ratios are determined, for the first time in the case of AW UMa, and compared with the photometric values. The results obtained show a significant discrepancy in the case of W UMa but good agreement for AW UMa, and it is suggested that a possible explanation is in terms of line distortion.

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Radial velocity observations obtained by a numerical cross-correlation technique are presented for the two W Ursae Majoris type contact binaries W UMa and AW UMa. Spectroscopic mass ratios are determined, for the first time in the case of AW UMa, and compared with the photometric values. The results obtained show a significant discrepancy in the case of W UMa but good agreement for AW UMa, and it is suggested that a possible explanation is in terms of line distortion.

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Available abstract

Radial velocity observations obtained by a numerical cross-correlation technique are presented for the two W Ursae Majoris type contact binaries W UMa and AW UMa. Spectroscopic mass ratios are determined, for the first time in the case of AW UMa, and compared with the photometric values. The results obtained show a significant discrepancy in the case of W UMa but good agreement for AW UMa, and it is suggested that a possible explanation is in terms of line distortion.

Key concepts: Physics, Contact binary, Radial velocity, Astrophysics, Binary number, Binary star, Astronomy, Stars

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