Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2807p&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #28.07; Bulletin of the American Astronomical Society, Vol. 24, p.771
Astronomy and Astrophysics
Astronomy
Scientific paper
Last year (Peterson, D. M., 1991, ASP Conf. Ser. 13, 592) we reported the detection of the secondary spectrum in this 140 day Hyades binary. The relative brightness of the secondary suggested that the historical measures were likely biased, and the the amplitudes and hence the masses must be treated with caution. We have pursued this system as part of the radial velocity program at the Oak Ridge Observatory (Latham, D. W. 1985, IAU Colloq. 88, 21). In particular, we have obtained high S/N spectra of the 5180 Angstroms region covering almost two full cycles. With these new data we have cross-correlated with templates generated from model spectra kindly provided by R. L. Kurucz. This allows a much better match to be made to the spectra, including the effects of differing log g and rotational velocity. We do indeed find that the early measures were substantially affected by the undetected secondary, and that in particular the velocity amplitude needs to be increased. Further, there is some evidence that the separation of the two spectra reported last year was incomplete, probably owing to the use of Procyon as a template (albeit with specific allowance for the different rotational velocities). It appears that the masses, and hence the distance derived from the optical orbit for this system, must be revised upwards.
Peterson Deane M.
Stefanik Robert P.
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