Oscillation mode identifications and models for the delta Scuti star FG Virginis

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dc.creatorViskum, M.
dc.creatorKjeldsen, H.
dc.creatorBedding, T. R.
dc.creatorDall, T. H.
dc.creatorBaldry, I. K.
dc.creatorBruntt, H.
dc.creatorFrandsen, S.
dc.date1998-04-21
dc.date.accessioned2026-07-07T02:26:39Z
dc.date.available2026-07-07T02:26:39Z
dc.descriptionWe present new spectroscopic and photometric time series observations of the delta Scuti star FG~Vir. We detect the oscillations via changes in the equivalent widths of hydrogen and metal absorption lines. From the ratios between spectroscopic and photometric amplitudes, we assign l values to the eight strongest oscillation modes. In particular, we identify two radial modes (l =0) and find that the main pulsation mode (147 microHz) has l = 1. One of the radial modes (at 140 microHz) is the fundamental, implying that two modes with lower frequencies are g-modes. For the radial modes, we compare frequencies with those calculated from a scaled delta Scuti star model and derive a density 0.1645 +/- 0.0005 rho_sol. We then obtain a distance of 84 +/- 3 pc, in excellent agreement with the Hipparcos value. Finally, we suggest that a 3.5-day variability in all observables (equivalent widths and intensity) is caused by stellar rotation.
dc.description12 pages, latex with figures. Accepted by A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9804218
dc.identifierhttp://arxiv.org/abs/astro-ph/9804218
dc.identifierAstron.Astrophys. 335 (1998) 549-560
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12362
dc.subjectAstrophysics
dc.titleOscillation mode identifications and models for the delta Scuti star FG Virginis
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