Simultaneous intensive photometry and high resolution spectroscopy of delta Scuti stars. III. Mode identifications and physical calibrations in HD 2724

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dc.creatorBossi, M.
dc.creatorMantegazza, L.
dc.creatorNunez, N. S.
dc.date1998-05-27
dc.date.accessioned2026-07-07T02:27:02Z
dc.date.available2026-07-07T02:27:02Z
dc.descriptionOn the basis of our new simultaneous photometry and spectroscopy (885 uvby differential measurements in 11 nights and 154 spectrograms of the FeII 4508 A region in 5 nights), we can detect 12 probable periodicities in the variability pattern of this star, determining the frequencies of 7 without any ambiguity. Through a direct fit of pulsational models to our data, we estimate the inclination of rotational axis to be about 50 deg. and get a reliable identification of 4 modes as well as useful bits of information about the others: no retrograde mode is visible, whereas the star seems to show a certain preference for purely sectorial prograde oscillations. Finally, the attribution of our lowest frequency to the radial fundamental pulsation allows a new calibration of physical parameters. In particular, the gravity can be determined with unusual accuracy and the luminosity evaluation becomes more consistent with the Hipparcos astrometry.
dc.description9 pages, 9 figures. To be published in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9805331
dc.identifierhttp://arxiv.org/abs/astro-ph/9805331
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12525
dc.subjectAstrophysics
dc.titleSimultaneous intensive photometry and high resolution spectroscopy of delta Scuti stars. III. Mode identifications and physical calibrations in HD 2724
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