Carciofi, Alex C.
Borre, Camilla C.
Siverd, Robert J.
Total Authors: 8
 Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
 European Org Astron Res Southern Hemisphere ESO, Karl Schwarzschild Str 2, D-85748 Garching - Germany
 European Org Astron Res Southern Hemisphere ESO, Casilla 19001, Santiago 19 - Chile
 Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C - Denmark
 NSFs NOIRLab, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 - USA
Total Affiliations: 5
Monthly Notices of the Royal Astronomical Society;
Web of Science Citations:
In photometry of gamma Cas (B0.5 IVe) from the Solar Mass Ejection Imager (SMEI) and the BRIght Target Explorer (BRITE)-Constellation satellites, indications of low-order non-radial pulsation have recently been found, which would establish an important commonality with the class of classical Be stars at large. New photometry with the Transiting Exoplanet Survey Satellite (TESS) has detected three frequency groups near 1.0 (g1), 2.4 (g2), and 5.1 (g3) d(-1), respectively. Some individual frequencies are nearly harmonics or combination frequencies but not exactly so. Frequency groups are known from roughly three quarters of all classical Be stars and also from pulsations of beta Cep, slowly pulsating B (SPB), and gamma Dor stars and, therefore, firmly establish gamma Cas as a non-radial pulsator. The total power in each frequency group is variable. An isolated feature exists at 7.57 d(-1) and, together with the strongest peaks in the second and third groups ordered by increasing frequency (g2 and g3), is the only one detected in all three TESS sectors. The former long-term 0.82 d(-1) variability would fall into g1 and has not returned at a significant level, questioning its attribution to rotational modulation. Low-frequency stochastic variability is a dominant feature of the TESS light curve, possibly caused by internal gravity waves excited at the core-envelope interface. These are known to be efficient at transporting angular momentum outward, and may also drive the oscillations that constitute g1 and g2. The hard X-ray flux of gamma Cas is the only remaining major property that distinguishes this star from the class of classical Be stars. (AU)