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213 papers
The Orbits and Dynamical Masses of the Castor System
Guillermo Torres, Gail H. Schaefer, John D. Monnier +12
Castor is a system of six stars in which the two brighter objects, Castor A and B, revolve around each other every 450 yr and are both short-period spectroscopic binaries. Th…
Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age
Ralph Neuhäuser, Guillermo Torres, Markus Mugrauer +4
After core hydrogen burning, massive stars evolve from blue-white dwarfs to red supergiants by expanding, brightening, and cooling within few millennia. We discuss a previously neg…
Orbital Solution and Dynamical Masses for the Nearby Binary System Gls 67 AB
Guillermo Torres
We report spectroscopic observations of the nearby, 19.5 yr binary system Gls 67 AB spanning more than 35 yr. We carry out a global orbital solution combining our radial velocity m…
A Stringent Test of Magnetic Models of Stellar Evolution
Guillermo Torres, Gregory A. Feiden, Andrew Vanderburg +1
Main-sequence stars with convective envelopes often appear larger and cooler than predicted by standard models of stellar evolution for their measured masses. This is believed to b…
On the correct use of gravity darkening coefficients in the JKTEBOP eclipsing binary code
Guillermo Torres
Users of the JKTEBOP code to solve the light curves of eclipsing binaries often confuse the gravity darkening coefficients, , with the bolometric gravity darkening exponents,…
Eclipsing binaries in the open cluster Ruprecht 147. IV: The active triple system EPIC 219511354
Guillermo Torres, Andrew Vanderburg, Jason L. Curtis +2
We report follow-up spectroscopic observations of the 1.62 day, K-type, detached, active, near-circular, double-lined eclipsing binary EPIC 219511354 in the open cluster Ruprecht 1…