Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.3203p&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #32.03; Bulletin of the American Astronomical Society, Vol. 28, p.1312
Other
2
Scientific paper
Observations of the young (8x 10(7) yr) binary star iota Peg were recently conducted with the Palomar Testbed Interferometer funded by the ASEPS program. For the first time we have determined its visual orbit with separations of 1 mas in R.A. This system has a circular orbit with a radii of 9.4 mas. By combining our data with previous radial velocity measurements we infer that the primary is F5V, mass 1.3 Msun and the secondary is G9V, mass 0.8 M_sun. The distance of the star is determined as 12.1 pc. The two solar-type stars rotate about each other with a separation of only 0.12 AU. By combining these measurements with earlier Mark III Stellar Interferometer data, the V magnitude of the two components is 3.86 mag and 6.36 mag. The corresponding theoretical estimated diameters are 1 mas and 0.7 mas. Both of the components fit the main sequence on the H-R diagram extremely well. Earlier spectroscopic studies have suggested that the system may be an eclipsing binary. Our measured inclination is 94(deg) and we predict that the eclipse will be grazing and last for 3 hours. Photometric observations of the system at the predicted eclipse would be extremely useful.
Colavita Mark M.
Kulkarni Sandeep S.
Pan Xiaochuan
Shao Maxine
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