CoRoT 102699796, the first metal‐poor Herbig Ae pulsator: a hybrid δ Sct–γ Dor variable?★†

We present the analysis of the time series observations of CoRoT102699796 obtained by the CoRoT satellite that show the presence of five independent oscillation frequencies in the range 3.6-5 c/d. Using spectra acquired with FLAMES@VLT, we derive the following stellar parameters: spectral type F1V, Teff=7000±200 K, log(g)=3.8 ± 0.4, [M/H]= 1.1±0.2, vsini=50 ± 5 km/s, L/L⊙=21 +2111 . Thus, for the first time we report the existence of a metal poor, intermediate-mass PMS pulsating star. Ground-based and satellite data are used to derive the spectral energy distribution of CoRoT102699796 extending from the optical to mid-infrared wavelengths. The SED shows a significant IR excess at wavelengths greater than � 5µ. We conclude that CoRoT102699796 is a young Herbig Ae (F1Ve) star with a transitional disk, likely associated to the HII region [FT96]213.1-2.2. The pulsation frequencies have been interpreted in the light of the non-radial pulsation theory, using the LOSC code in conjunction with static and rotational evolutionary tracks. A minimization algorithm was used to find the best-fit model with M=1.84 M⊙, Teff=6900 K which imply an isochronal age of t�2.5 Myr. This result is based on the interpretation of the detected frequencies as g-modes of low-moderate n-value. To our knowledge, this is the first time that such modes are identified in a intermediate-mass PMS pulsating star. Since CoRoT102699796 lies in the region of