Spectroscopic detection of Altair’s non-radial pulsations

Context. Rapid rotation is a common feature of early-type stars but remains challenge for models. Nevertheless, we need to understand its effect on stellar evolution in order interpret the observed properties numerous stars. Aims. We wish provide more observational constraints fast rotating stars, especially their oscillation modes. Methods. focus nearby star Altair which known be very rapidly with an equatorial velocity recently estimated at 313 km s −1 . this high-resolution spectropolarimeter Neo-Narval over six nights, one night interruption, September 2020. Results. detect significant line profile variations mean spectra. Their time-frequency analysis shows that these are induced by gravito-inertial waves propagating Altair’s surface azimuthal wavenumbers m = 10 − 15. With preliminary computation eigenspectrum using most recent concordance model carried out first modelling waves. Conclusions. was as brightest δ Scuti star. now see it hybrid oscillating and acoustic being excited. Clearly, observations advanced models needed explain greater details.