Studies of late-type binaries. IV - The physical parameters of ER Vulpeculae

Details Studies of late-type binaries. IV - The physical parameters of ER Vulpeculae Studies of late-type binaries. IV - The physical parameters of ER Vulpeculae

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..145h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 145-159.

Physics

36

Binary Stars, Hot Stars, Late Stars, Stellar Physics, Stellar Spectrophotometry, Light Curve, Stellar Activity, Stellar Evolution

Scientific paper

A spectroscopic study of the RS CVn-related star ER Vul is reported. The orbital parameters are given and rotational velocities of 81 + or - 2 and 71 + or - 2 km/s are obtained for the primary and secondary respectively. The secondary undergoes changes in line strength between quadratures, being 8 percent stronger at photometric phase 0.75 than at 0.25. Estimates of the mean magnitude differences as a function of phase and epoch are presented from a number of complete light curves. These data indicate that part of a stellar activity cycle is present and the color and magnitude variations are consistent with a spot of area 26 percent and temperature near 5000 K located at the pole of the hot star.

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