Mon. Not. R. Astron. Soc., 437, 906-915 (2014/January-1)
Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348.
RIPEPI V., MOLINARO R., MARCONI M., CATANZARO G., CLAUDI R., DASZYNSKA-DASZKIEWICZ J., PALLA F., LECCIA S. and BERNABEI S.
Abstract (from CDS):
In this paper we present new photometric and radial velocity data for the PMS δ Sct star H254, member of the young cluster IC 348. Photometric V, RC, IC light curves were obtained at the Loiano and Asiago telescopes. The radial velocity data were acquired by means of the SARG@Telescopio Nazionale Galileo spectrograph. High-resolution spectroscopy allowed us to derive precise stellar parameters and the chemical composition of the star, obtaining Teff = 6750±150 K; logg = 14.1±0.4 dex and [Fe/H] = -0.07±0.12 dex. Photometric and spectroscopic data were used to estimate the total absorption in the V band AV = 2.06±0.05 mag, in agreement with previous estimates. We adopted the technique of the difference in phase and amplitude between different photometric bands and radial velocities to verify that H254 is (definitely) pulsating in a radial mode. This occurrence allowed us to apply the CORS realization of the Baade-Wesselink method to obtain a value for the linear radius of H254 equal to 3.3±0.7 R☉. This result was used in conjunction with photometry and effective temperature to derive a distance estimate of 273±23 pc for H254, and, in turn for IC 348, the host cluster. This value is in agreement within the errors with the results derived from several past determinations and the evaluation obtained through the Hipparcos parallaxes. Finally, we derived the luminosity of H254 and studied its position in the Hertzsprung-Russell diagram. From this analysis it results that this δ Scuti occupies a position close to the red edge of the instability strip, pulsates in the fundamental mode, has a mass of about 2.2M☉ and an age of 5±1Myr, older than previous estimates.
© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
stars: abundances - stars: fundamental parameters - stars: pre-main-sequence - stars: variables: δ Scuti - stars: variables: T Tauri, Herbig Ae/Be - open clusters and associations: individual: IC 348
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<Available at CDS (J/MNRAS/437/906): table2.dat>
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