000006673 001__ 6673
000006673 005__ 20240126104847.0
000006673 0247_ $$2DOI$$a10.1093/mnras/stad1971
000006673 037__ $$aSCART-2024-0045
000006673 100__ $$aHenriksen, Andreea I.
000006673 245__ $$aUnresolved Rossby and gravity modes in 214 A and F stars showing rotational modulation
000006673 260__ $$c2023
000006673 520__ $$aHere, we report an ensemble study of 214 A- and F-type stars observed by Kepler, exhibiting the so-called hump and spike periodic signal, explained by Rossby modes (r modes) - the hump - and magnetic stellar spots or overstable convective (OsC) modes - the spike, respectively. We determine the power confined in the non-resolved hump features and find additional gravity-mode (g-mode) humps always occurring at higher frequencies than the spike. Furthermore, we derive projected rotational velocities from FIES, SONG, and HERMES spectra for 28 stars and the stellar inclination angle for 89 stars. We find a strong correlation between the spike amplitude and the power in the r and g modes, which suggests that both types of oscillations are mechanically excited by either stellar spots or OsC modes. Our analysis suggests that stars with a higher power in m = 1 r-mode humps are more likely to also exhibit humps at higher azimuthal orders (m = 2, 3, or 4). Interestingly, all stars that show g-mode humps are hotter and more luminous than the observed red edge of the δ Scuti instability strip, suggesting that either magnetic fields or convection in the outer layers could play an important role.
000006673 594__ $$aNO
000006673 6531_ $$astars: early-type
000006673 6531_ $$astars: oscillations
000006673 6531_ $$astars: rotation
000006673 700__ $$aAntoci, Victoria
000006673 700__ $$aSaio, Hideyuki
000006673 700__ $$aGrundahl, Frank
000006673 700__ $$aKjeldsen, Hans
000006673 700__ $$aVan Reeth, Timothy
000006673 700__ $$aBowman, Dominic M.
000006673 700__ $$aPápics, Péter I.
000006673 700__ $$aDe Cat, Peter
000006673 700__ $$aKrüger, Joachim
000006673 700__ $$aAndersen, M. Fredslund
000006673 700__ $$aPallé, P. L.
000006673 773__ $$c4196--4211$$n3$$pMonthly Notices of the Royal Astronomical Society$$v524$$y2023
000006673 8560_ $$fpeter.decat@ksb-orb.be
000006673 8564_ $$s2603837$$uhttp://publi2-as.oma.be/record/6673/files/Henriksen2023_MNRAS524_4196.pdf
000006673 8564_ $$s4318$$uhttp://publi2-as.oma.be/record/6673/files/Henriksen2023_MNRAS524_4196.gif?subformat=icon$$xicon
000006673 8564_ $$s7536$$uhttp://publi2-as.oma.be/record/6673/files/Henriksen2023_MNRAS524_4196.jpg?subformat=icon-180$$xicon-180
000006673 905__ $$apublished in
000006673 980__ $$aREFERD