Two New roAp Stars Discovered with TESS

Jayaraman, Rahul, Kurtz, Donald Wayne orcid iconORCID: 0000-0002-1015-3268, Handler, Gerald, Rappaport, Saul and Ricker, George (2021) Two New roAp Stars Discovered with TESS. Research Notes of the American Astronomical Society, 5 (11). p. 268. ISSN 2515-5172

[thumbnail of Version of Record]
Preview
PDF (Version of Record) - Published Version
Available under License Creative Commons Attribution.

334kB

Official URL: https://doi.org/10.3847/2515-5172/ac3a8a

Abstract

Abstract: 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 day−1 (1.93 mHz), with two nearby peaks at 163.412 day−1 (1.89 mHz) and 169.600 day−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 day−1 (2.218 mHz), with sidebands at 191.164 day−1 (2.213 mHz) and 192.119 day−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.


Repository Staff Only: item control page