38 papers
The Scuti pulsator occurrence as a function of age, , rotation, and metallicity
Ian Berry, Daniel Huber, Yaguang Li +3
Many A- and F- type stars do not display Scuti pulsations, despite being located within the instability strip. We use photometry from the TESS Mission to discover and study …
The Stellar Observations Network Group (SONG) -- A Legacy Archive of Stellar Time-Domain Spectroscopy
M. N. Lund, F. Grundahl, M. S. Fredslund +35
The Stellar Observations Network Group (SONG) network has operated for more than a decade, providing long-baseline, high-cadence spectroscopic observations of bright stars and the…
Modelling Scuti pulsations: A new grid of p, g, and f modes across pre-main-sequence to post-main-sequence evolution
Anuj Gautam, Simon J. Murphy, Timothy R. Bedding
Space-based photometry reveals regular high-frequency patterns in many young Scuti stars. These pulsations provide a powerful means of inferring stellar properties, particular…
The Pan-Pacific Planet Search -- IX. A menagerie of companions orbiting evolved stars
Robert A. Wittenmyer, Alexander Venner, Tyler Fairnington +22
We present resolutions as to the nature of six speculative candidate companions proposed in the final data release of the Pan-Pacific Planet Search, a 6-year radial-velocity survey…
TESS Observations of Stochastic Low-frequency Variability in Extreme Helium Stars
Courtney L. Crawford, C. Simon Jeffery, May G. Pedersen +4
Extreme helium stars (EHes) are low-mass hydrogen-deficient stars thought to be the products of double white dwarf mergers. Despite prolonged ground-based observations, there is no…
Asteroseismology of red giants in the globular cluster 47 Tuc using the HST
Dennis Stello, Timothy R. Bedding, Ronald L. Gilliland
Globular clusters provide unique opportunities to study stellar evolution -- as the second brightest cluster, 47 Tuc is a prime target. Asteroseismology can be used to measure prec…