EDP Sciences
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Volume 399, Number 1, February III 2003
Page(s) 271 - 274
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20021792

A&A 399, 271-274 (2003)
DOI: 10.1051/0004-6361:20021792

Oscillations in the PMS $\delta$ Scuti star V346 Ori

F. J. G. Pinheiro1, D. F. M. Folha1, M. Marconi2, V. Ripepi2, F. Palla3, M. J. P. F. G. Monteiro1, 4 and S. Bernabei5, 6

1  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
2  INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
3  INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
4  Departamento de Matemática Aplicada, Faculdade de Ciências da Universidade do Porto, Portugal
5  INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
6  Departamento de Astrofísica, Universidad de La Laguna, Avda. Astrofísico F. Sánchez s/n, Campus de Anchieta, 38206 La Laguna, Spain

(Received 16 September 2002 / Accepted 27 November 2002)

We report the discovery of periodicities in the light curve of the Pre-Main Sequence (PMS) Herbig Ae star V346 Ori. We interpret variations in the light curve of the star as the superposition of at least two periodic signals that result from  $\delta$ Scuti-type stellar oscillations. The computation of linear non-adiabatic radial pulsation models for PMS stars reproduces these periods for a 1.55  $M_\odot$ star with Teff = 7410 K and log $L/L_\odot = 0.74$ pulsating in the fundamental and in the second overtone. If our assumption of radial oscillations is indeed correct, the star's location on the HR diagram places it at a distance significantly smaller than that of the Orion star forming region, hence raising questions regarding the evolutionary status of V346 Ori. Observations with better time sampling and spanning a longer period of time are needed if the latter question is to be addressed fully.

Key words: stars: evolution -- stars: fundamental parameters -- stars: oscillations -- stars: pre-main sequence -- stars: variables: $\delta$ Sct -- stars: individual: V346 Ori

Offprint request: D. F. M. Folha, dfmf@astro.up.pt

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