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5 papers · 2 filters
Activity trends in young solar-type stars
Jyri Lehtinen, Lauri Jetsu, Thomas Hackman +2
We study a sample of 21 young and active solar-type stars with spectral types ranging from late F to mid K and characterize the behaviour of their activity. We apply the continuous…
Sun-Like Magnetic Cycles in the Rapidly-Rotating Young Solar Analog HD 30495
Ricky Egeland, Travis S. Metcalfe, Jeffrey C. Hall +1
A growing body of evidence suggests that multiple dynamo mechanisms can drive magnetic variability on different timescales, not only in the Sun but also in other stars. Many solar…
Detecting the Companions and Ellipsoidal Variations of RS CVn Primaries: II. omicron Draconis, a Candidate for Recent Low-Mass Companion Ingestion
Rachael M. Roettenbacher, John D. Monnier, Francis C. Fekel +14
To measure the stellar and orbital properties of the metal-poor RS CVn binary o Draconis (o Dra), we directly detect the companion using interferometric observations obtained with…
Predicting alpha Comae Berenices Time of Eclipse II: How 3 Faulty Measurements Out of 609 Caused A 26 Year Binary's Eclipse To Be Missed
Matthew W. Muterspaugh, M. J. P. Wijngaarden, H. F. Henrichs +3
The dwarf stars in the 26 year period binary alpha Com were predicted to eclipse each other in early 2015. That prediction was based on an orbit model made with over 600 astrometri…
Stellar Activity and its Implications for Exoplanet Detection on GJ 176
Paul Robertson, Michael Endl, Gregory W. Henry +3
We present an in-depth analysis of stellar activity and its effects on radial velocity (RV) for the M2 dwarf GJ 176 based on spectra taken over 10 years from the High Resolution Sp…