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47 papers
Rapidly oscillating Ap stars observed with TESS. The LAMOST Ap sample and 49 Cam
Inês Rolo, Daniel L. Holdsworth, Margarida S. Cunha +4
The rapidly oscillating chemically peculiar A-type (roAp) stars offer valuable insights into the internal physical processes of all stars, but their study is challenged by their ra…
Super-slowly rotating Ap (ssrAp) stars: New spectroscopic observations
Gautier Mathys, Daniel L. Holdsworth, Marina Giarrusso +2
The rotation periods of Ap stars range over five to six orders of magnitude. The origin of their differentiation remains unknown. We carry out a systematic study of the longest per…
HD 60435: The star that stopped pulsating
Donald W. Kurtz, Gerald Handler, Daniel L. Holdsworth +10
HD 60435 is a well-known rapidly oscillating (roAp) Ap star with a series of alternating even and odd degree modes, making it a prime asteroseismic target. It is also an oblique pu…
Super-slowly rotating Ap (ssrAp) stars: Spectroscopic study
G. Mathys, D. L. Holdsworth, M. Giarrusso +3
To gain better understanding of the Ap stars with the longest rotation periods, we obtained high resolution spectra of a sample of super-slowly rotating Ap (ssrAp) star candidates…
HD 12098: a highly distorted dipole mode in an obliquely pulsating roAp star
D. W. Kurtz, H. Saio, D. L. Holdsworth +2
HD 12098 is an roAp star pulsating in the most distorted dipole mode yet observed in this class of star. Using TESS Sector 58 observations we show that there are photometric spots…
TESS Cycle 2 observations of roAp stars with 2-min cadence data
D. L. Holdsworth, M. S. Cunha, M. Lares-Martiz +46
We present the results of a systematic search of the Transiting Exoplanet Survey Satellite (TESS) 2-min cadence data for new rapidly oscillating Ap (roAp) stars observed during the…