TESS Cycle 2 observations of roAp stars with 2-min cadence data

0586884 - ASÚ 2025 RIV US eng J - Journal Article
Holdsworth, L.D. - Cunha, M.S. - Lares-Martiz, M. - Skarka, Marek … Total 50 authors
TESS Cycle 2 observations of roAp stars with 2-min cadence data.
Monthly Notices of the Royal Astronomical Society. Roč. 527, č. 4 (2024), s. 9548-9580. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA MŠMT(CZ) LTT20015
Institutional support: RVO:67985815
Keywords : asteroseismology * photometric techniques * stars: chemically peculiar
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.8, year: 2022
Method of publishing: Open access

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 Cycle 2 phase of its mission. We find seven new roAp stars previously unreported as such and present the analysis of a further 25 roAp stars that are already known. Three of the new stars show multiperiodic pulsations, while all new members are rotationally variable stars, leading to almost 70 per cent (22) of the roAp stars presented being α2 CVn-type variable stars. We show that targeted observations of known chemically peculiar stars are likely to overlook many new roAp stars, and demonstrate that multiepoch observations are necessary to see pulsational behaviour changes. We find a lack of roAp stars close to the blue edge of the theoretical roAp instability strip, and reaffirm that mode instability is observed more frequently with precise, space-based observations.
Permanent Link: https://hdl.handle.net/11104/0354255