RV Tauri variables are luminous pulsating supergiant stars with temperatures ranging between 4000 – 6000 K. They extend the brightest part of the Type II Cepheid period-luminosity relationship, which may be used as standard candles. Binarity plays a key role in the dynamics and evolution of these objects as they transition into planetary nebulae. I will present multiwavelength observations of two archetypical RV Tauri systems and discuss our findings. We used Kepler observations of DF Cygni, the only RV Tauri system in Kepler's original field-of-view, and its spectral energy distribution to provide evidence for disk obscuration. I will also discuss how our XMM-Newton data makes U Monocerotis (U Mon) the first RV Tauri system detected in X-rays. Combining historic Harvard photographic plates (DASCH) data and observations from American Association of Variable Star Observers (AAVSO), we extended U Mon’s photometric time-series baseline back to the late 1880s.
Laura D. Vega, Postdoctoral Researcher at NASA Goddard Space Flight Center and the University of Maryland, College Park
Speaker bio >>
Astronomy/Astrophysics seminars are held (roughly) weekly on Fridays at 2 pm (ET) on campus in Washington DC.
The seminar is fairly casual, and the audience is mostly astronomers, with some cosmochemists or geophysicists occasionally. The seminar will be hosted in a Hybrid format for Spring 2023.Full Schedule
Share your science
You can use this form to nominate speakers (or yourself) for a seminar slot. Note that if we receive more nominations than expected, the speakers will be selected through a vote by the Carnegie EPL Astronomy group.Nomination Form