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A Search for Short-Term RV Variations in Early-Type Binaries

  • H. Lehmann (a1), G. Scholz (a2) and G. Hildebrandt (a2)

Abstract

We developed a procedure to disentangle the different radial velocity variations due to orbital motion, rotation, and pulsation based on an iterative mutual subtraction of orbital and short-term contributions. The method was successfully tested on a data set of over 2200 spectra of the eclipsing β Cep star EN Lac spanning a time interval of about 90 years. We further applied the procedure to early type binaries. For the A1 III star 21 Her we found short-term variations which indicate the presence of rotationally split nonradial pulsation (NRP) modes.

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Copyright

References

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Harper, W.E. 1934, Publ. Dom. Astrophys. Obs. 6, 235
Lehmann, H., Scholz, G., Hildebrandt, G., & Panov, K. 1999, A&A, 351, 267
Lehmann, H., Harmanec, P., Aerts, C., et al. 2001a, A&A, 367, 236
Lehmann, H., Hildebrandt, G., Panov, K.P., & Scholz, G. 2001b, A&A, 373, 960
Lehmann, H., Andrievsky, S.M., Egorova, I., et al. 2001c, A&A, in press

A Search for Short-Term RV Variations in Early-Type Binaries

  • H. Lehmann (a1), G. Scholz (a2) and G. Hildebrandt (a2)

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