Constraining the properties of delta Scuti stars using spectroscopic eclipsing binary systems
arXiv:1105.1045 · doi:10.1088/0004-637X/733/1/38
Abstract
Many stars exhibit stellar pulsations, favoring them for asteroseismic analyses. Interpreting the oscillations requires some knowledge of the oscillation mode geometry (spherical degree, radial and azimuthal orders). The delta Scuti stars (1.5 - 2.5 M_sol) often show just one or few pulsation frequencies. Although this may promise a successful seismological analysis, we may not know enough about either the mode or the star to use the oscillation frequency to improve the determination of the stellar model, or probe the star's structure. For the observed frequencies to be used successfully as seismic probes of these objects, we need to concentrate on stars for which we can reduce the number of free parameters in the problem, such as binary systems or open clusters. We investigate how much our understanding of a delta Scuti star is improved when it is in a detached eclipsing binary system instead of being a single field star. We use singular value decomposition to explore the precision we expect in stellar parameters (mass, age and chemical composition) for both cases. We examine how the parameter uncertainties propagate to the luminosity - effective temperature diagram and determine when the effort of obtaining a new measurement is justified. We show that for the single star, a correct identification of the oscillation mode is necessary to produce strong constraints on the stellar model properties, while for the binary system the observations without the pulsation mode provide the same or better constraints on the stellar parameters. In the latter case, ...
emulateapj 16 pages, accepted ApJ
References in corpus (30)
- The Sloan Digital Sky Survey: Technical Summary
- A standard stellar library for evolutionary synthesis: I. Calibration of theoretical spectra
- ASTEC -- the Aarhus STellar Evolution Code
- Accurate fundamental parameters for 23 bright solar-type stars
- System description and first light-curves of HAT, an autonomous observatory for variability search
- Constraining fundamental stellar parameters using seismology. Application to Alpha Centauri AB
- A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764
- A Stellar Model-fitting Pipeline for Asteroseismic Data from the Kepler Mission
- Detection of 75+ pulsation frequencies in the Delta Scuti star FG Vir
- Discovery of a red giant with solar-like oscillations in an eclipsing binary system from Kepler space-based photometry
- A photometric mode identification method, including an improved non-adiabatic treatment of the atmosphere
- A new method for the spectroscopic identification of stellar non-radial pulsation modes. I. The method and numerical tests
- On the Structure and Properties of Differentially Rotating Main-Sequence Stars in the 1-2 M_sun Range
- The complementary roles of interferometry and asteroseismology in determining the mass of solar-type stars
- A new method for the spectroscopic identification of stellar non-radial pulsation modes. II. Mode identification of the Delta Scuti star FG Virginis
- Detection of solar-like oscillations from Kepler photometry of the open cluster NGC 6819
- Inferences from pulsational amplitudes and phases for multimode Sct star FG Vir
- Fundamental Properties and Distances of LMC Eclipsing Binaries: III. EROS 1044
- A New Detached M Dwarf Eclipsing Binary
- Photometric multi-site campaign on the open cluster NGC 884 I. Detection of the variable stars
- A seismological analysis of Delta Scuti stars in the Pleiades cluster
- Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
- CD Tau: a detached eclipsing binary with a solar-mass companion
- Bright Variable Stars in NGC 6819 - An Open Cluster in the Kepler Field
- Detection of a classical Delta Scuti star in the new eclipsing binary system HIP 7666
- HD172189: another step in furnishing one of the best laboratories known for asteroseismic studies
- Asteroseismology of delta Scuti stars - a parameter study and application to seismology of FG Virginis
- Pulsational frequencies of the eclipsing delta-Scuti star HD 172189
- Notes on the disentangling of spectra I. Enhancement in precision
- Accurate fundamental parameters of eclipsing binary stars