Volume 399, Number 1, February III 2003
|Page(s)||271 - 274|
|Section||Stellar structure and evolution|
|Published online||05 February 2003|
Oscillations in the PMS δ Scuti star V346 Ori*
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
Corresponding author: D. F. M. Folha, email@example.com
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 δ Scuti-type stellar oscillations. The computation of linear non-adiabatic radial pulsation models for PMS stars reproduces these periods for a 1.55 star with K and log 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: δ Sct / stars: individual: V346 Ori
© ESO, 2003
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