Multisite photometry of the pulsating Herbig Ae star V346 Ori

Abstract

CONTEXT: The study of pulsation in Pre--Main--Sequence intermediate-mass stars represents an important tool for deriving information on fundamental stellar parameters and internal structure, as well as for testing current theoretical models. Interest in this class of variable stars has significantly increased during the last decade and about 30 members are presently known in the literature. AIMS: We have constructed the frequency spectrum of the oscillations in V346 Ori. We apply asteroseismic tools to these data to estimate the intrinsic parameters (mass, luminosity, effective temperature) of V346 Ori and to obtain information on its internal structure. METHODS: CCD time series photometry in the Johnson V filter has been obtained for a total of 145.7 h of observations distributed over 36 nights. The resulting light curves have been subjected to a detailed frequency analysis using updated numerical techniques. Photometric and spectroscopic data have also been acquired to determine reliable estimates of the stellar properties. RESULTS: We have identified 13 oscillation frequencies, 6 of which with higher significance. These have been compared with the predictions of non-radial adiabatic models. The resulting best fit model has a mass of 2.1$\pm$0.2 $M_{\odot }$, luminosity $\log L/L_{\odot }=1.37_{-0.13}^{+0.11}$, and effective temperature 7300$\pm$200 K. These values are marginally consistent with the association of V346 Ori to Orion OB1a. Alternatively, V346 Ori could be placed at a slightly larger distance than previously estimated.

Accepted for publication on A&A. 14 Pages, 11 Figures

References in corpus (5)

• The distance to the Orion Nebula Cluster
• Comparing the observational instability regions for pulsating pre-main sequence and classical $\delta$ Scuti stars
• A theoretical approach for the interpretation of pulsating PMS intermediate-mass stars
• Abundance analysis of seven delta Scuti Stars
• Helium stratification in HD 145792: a new Helium strong star

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• The imprint of star formation on stellar pulsations
• Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348