We present two new rapidly oscillating Ap (roAp) stars, TIC 198781841 and TIC 229960986, discovered in TESS photometric data. The periodogram of TIC 198781841 has a large peak at 166.506 d−1 (1.93 mHz), with two nearby peaks at 163.412 d−1 (1.89 mHz) and 169.600 d−1 (1.96 mHz). These correspond to three independent high-overtone pressure modes, with alternating even and odd ℓ values. TIC 229960986 has a high-frequency triplet centered at 191.641 d−1 (2.218 mHz), with sidebands at 191.164 d−1 (2.213 mHz) and 192.119 d−1 (2.224 mHz). This pulsation appears to be a rotationally split dipole mode, with sideband amplitudes significantly larger than that of the central peak; hence, both pulsation poles are seen over the rotation cycle. Our photometric identification of two new roAp stars underscores the remarkable ability of TESS to identify high-frequency pulsators without spectroscopic observations.
@article{arxiv.2111.09352,
title = {Two New roAp Stars Discovered with TESS},
author = {Rahul Jayaraman and Donald W. Kurtz and Gerald Handler and Saul Rappaport and George Ricker},
journal= {arXiv preprint arXiv:2111.09352},
year = {2021}
}
Comments
4 pages, 1 figure, accepted for publication in RNAAS