142 citations · 661 across the 16 of their papers we have counts for
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The GW Vir instability strip in the light of new observations of PG 1159 stars. Discovery of pulsations in the central star of Abell 72 and variability of RX J0122.9-7521
Paulina Sowicka, Gerald Handler, David Jones +9
We present the results of new time series photometric observations of 29 pre-white dwarf stars of PG 1159 spectral type, carried out in the years 2014-2022. For the majority of sta…
Near-Infrared Evidence for a Sudden Temperature Increase in Eta Carinae
Andrea Mehner, Kazunori Ishibashi, Patricia Whitelock +4
Aims. Eta Car's ultra-violet, optical, and X-ray light curves and its spectrum suggest a physical change in its stellar wind over the last decade. It was proposed that the mass-los…
The UBV(RI)c colors of the Sun
I. Ramirez, R. Michel, R. Sefako +6
Photometric data in the UBV(RI)c system have been acquired for 80 solar analog stars for which we have previously derived highly precise atmospheric parameters Teff, log g, and [Fe…
The Spitzer Spectroscopic Survey of S-type Stars
K. Smolders, P. Neyskens, J. A. D. L. Blommaert +28
S-type AGB stars are thought to be in the transitional phase between M-type and C-type AGB stars. Because of their peculiar chemical composition, one may expect a strong influence…
Recurrent dust formation by WR 48a on a 30-year timescale
Peredur M. Williams, Karel A. van der Hucht, Francois van Wyk +4
We present infrared photometry of the WC8 Wolf-Rayet system WR 48a observed with telescopes at ESO, the SAAO and the AAT between 1982 and 2011 which show a slow decline in dust emi…
The discovery of rapid oscillations in the magnetic Ap stars HD69013 and HD96237
V. G. Elkin, D. W. Kurtz, H. L. Worters +4
We report the detection of short period variations in the stars HD69013 and HD96237. These stars possess large overabundances of rare earth elements and global magnetic fields, thu…
Post-AGB stars with hot circumstellar dust: binarity of the low-amplitude pulsators
Hans Van Winckel, Tom Lloyd Evans, Maryline Briquet +28
While the first binary post-AGB stars were serendipitously discovered, the distinct characteristics of their Spectral Energy Distribution (SED) allowed us to launch a more systemat…
Asteroseismology of hybrid pulsators made possible: simultaneous MOST space photometry and ground-based spectroscopy of Gamma Peg
G. Handler
We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid Beta Cep/SPB pulsator Gamma Peg. Frequency analyses reveal the presence of…
Asteroseismic analysis of the roAp star alpha Circini: 84 days of high-precision photometry from the WIRE satellite
H. Bruntt, D. W. Kurtz, M. S. Cunha +8
We present a detailed study of the pulsation of alpha Circini, the brightest of the rapidly oscillating Ap stars. We have obtained 84 days of high-precision photometry from four ru…