Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1095f&link_type=abstract
Astronomical Journal v.113, p.1095
Astronomy and Astrophysics
Astronomy
22
Scientific paper
HD 202908=ADS 14839 is a spectroscopic-visual triple system consisting of three solar-type stars. Eighteen years of spectroscopic observations including coverage of the recent periastron of 1987 January plus visual and speckle observations, the latter covering roughly the same interval as the radial velocities, have been used to obtain a simultaneous three-dimensional orbital solution. The short-period pair, Aa and Ab, has an orbital period of 3.9660465 days and a small but real eccentricity of 0.0033. The visual pair, A and B, has an orbital period of 78.5 yr and an eccentricity of 0.865. The solution yields masses for all three stars with uncertainties of about 2%, and the distance to the system with an uncertainty of 1.3%. Spectroscopic luminosity ratios, combined with the above distance, yield absolute magnitudes with uncertainties of about 0.1 mag. Thus the system provides three well-determined points on the mass- luminosity relationship. The inclinations of the short- and long-period orbits differ by 29°, making the orbits noncoplanar. Assuming synchronous rotation, the rotational and orbital axes of the short-period pair are aligned. The chromospheric emission, lithium abundance, and projected rotational velocity of component B indicate that the system is quite young, probably about the age of the Hyades Cluster. A comparison with theoretical evolutionary tracks supports such a conclusion.
Barlow D. J.
Duquennoy Antoine
Fekel Francis C.
Hartkopf William I.
Mason Brian D.
No associations
LandOfFree
New and Improved Parameters of HD 202908=ADS 14839: A Spectroscopic-Visual Triple System does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New and Improved Parameters of HD 202908=ADS 14839: A Spectroscopic-Visual Triple System, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New and Improved Parameters of HD 202908=ADS 14839: A Spectroscopic-Visual Triple System will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1858501