Kavli Affiliate: George Ricker
| First 5 Authors: Rahul Jayaraman, Donald W. Kurtz, Gerald Handler, Saul Rappaport, George Ricker
| Summary:
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 $ell$ 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.
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