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Issue A&A
Volume 408, Number 3, September IV 2003
Page(s) 1047 - 1055
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031011



A&A 408, 1047-1055 (2003)
DOI: 10.1051/0004-6361:20031011

Multisite observations of the PMS  $\delta$ Scuti star V351 Ori

V. Ripepi1, M. Marconi1, S. Bernabei2, 3, F. Palla4, F. J. G. Pinheiro5, D. F. M. Folha5, T. D. Oswalt6, L. Terranegra1, A. Arellano Ferro7, X. J. Jiang8, J. M. Alcalá1, S. Marinoni2, M. J. P. F. G. Monteiro5, M. Rudkin6 and K. Johnston6

1  INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
2  INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
3  Departimento de Astrofísica, Universidad de La Laguna, Avda. Astrofisico F. Sánchez sn, 30071 La Laguna, Spain
4  INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125 Firenze, Italy
5  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
6  Florida Inst. Technology, 150 W Univ. Blvd., Melbourne, FL 32901-6988, USA
7  Instituto de Astronomía, UNAM, Apdo. Postal 70-264, México D.F., CP 04510, México
8  National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, PR China



(Received 5 September 2002 / Accepted 20 June 2003)

Abstract
We present the results of multisite observations spanning two years on the pre-main-sequence (PMS) star V351 Ori. A total of around 180 hours of observations over 29 nights have been collected, allowing us to measure five different periodicities, most likely related to the  $\delta$ Scuti variability of V351 Ori. Comparison with the predictions of linear nonadiabatic radial pulsation models put stringent constraints on the stellar parameters and indicate that the distance to V351 Ori is intermediate between the lower limit measured by Hipparcos (210 pc) and that of the Orion Nebula (450 pc). However, radial pulsation models are unable to reproduce all of the observed frequencies with a single choice of ( $M_\ast$, $L_\ast$, and  $T_{\rm eff}$), suggesting the presence of additional nonradial modes.


Key words: stars: variables: $\delta$ Scuti -- stars: oscillations -- stars: pre-main sequence -- stars: fundamental parameters -- stars: individual: V351 Ori

Offprint request: V. Ripepi, ripepi@na.astro.it

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© ESO 2003


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