Delta Scuti ($\delta$ Sct) variables are intermediate mass stars that lie at the intersection of main sequence and instability strip on Hertzsprung-Russel diagram. Various lines evidence indicate nonlinear mode interactions shape their oscillation spectra, including particularly compelling detection resonantly interacting triplets in $\delta$ Sct star KIC 8054146. Motivated by these observation...

Pulsation frequencies of acoustic modes are calculated for realistic rotating stellar models using both a perturbative and a two-dimensional approach. A comparison between the two yields validity domains which are similar to those previously obtained in Reese et al. for polytropic models. One can also construct validity domains based on polynomial fits to the frequencies from the two-dimensiona...

We report the discovery of the first high-amplitude δ Scuti star in an eclipsing binary, which we have designated UNSW-V-500. The system is an Algol-type semi-detached eclipsing binary of maximum brightness V = 12.52 mag. A best-fitting solution to the binary light curve and two radial velocity curves is derived using the Wilson–Devinney code. We identify a late-A spectral-type primary componen...

The luminosity gap between novae (MR ≤ −10) and supernovae (MR ≥ −17) is well known since the pioneering research of Zwicky and Hubble. Nearby galaxy clusters and concentrations offer an excellent opportunity to search for explosions brighter than classical novae and fainter than supernovae. Here, we present the results of a B-band survey of 23 member galaxies of the Fornax cluster, performed a...

I give a summary of results from the WIRE satellite, which has been used to observe bright stars from 1999–2000 and 2003–2006. The WIRE targets are monitored for up to five weeks with a duty cycle of 30–40%. The aim has been to characterize the flux variation of stars across the Hertzsprung-Russell diagram. I present an overview of the results for solar-like stars, δ Scuti stars, giant stars, a...

The release of the Hipparcos catalogue (Perryman et al. 1997) provides an opportunity to check results from asteroseismology. This has already been done for the double-mode δ Scuti star SX Phe: Høg & Petersen (1997) found excellent agreement with the parallax derived from model calculations by Petersen & Christensen-Dalsgaard (1996). Here we show that Hipparcos parallaxes for two other stars ar...