Ground based observation of ZZ Ceti stars and the discovery of four new variables
arXiv:1909.05555 · doi:10.1093/mnras/stz2571
Abstract
We perform ground based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDSS J094929.09+101918.8, and two red edge pulsators, GD 195 and L495-82. In addition, we classified four objects as possible variables, since evidence of variability was detected in the light curve, but the S/N was not sufficient to establish a definite detection. Follow-up observations were performed for 10 know ZZ Ceti stars to verify period stability and search for new periodicities. For each confirmed variable, we perform a detailed asteroseismological fit and compare the structural parameters obtained from the best fit models with those obtained from spectroscopy and photometry from Gaia. Finally we present a study of the asteroseismological properties of a sample of 91 ZZ Ceti stars.
arXiv comment18 pages, 12 figures. Accepted for publication in MNRAS
References in corpus (37)
- Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
- SDSS DR7 White Dwarf Catalog
- A Comprehensive Spectroscopic Analysis of DB White Dwarfs
- A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
- Initial Characteristics of Kepler Short Cadence Data
- New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
- New cooling sequences for old white dwarfs
- Binary Star Orbits. V. The Nearby White Dwarf - Red Dwarf pair 40 Eri BC
- White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
- Gravity-Modes in ZZ Ceti Stars: I.Quasiadiabatic Analysis of Overstability
- Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
- On the evolution of ultra-massive white dwarfs
- White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
- Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
- Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
- Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2
- Ensemble Characteristics of the ZZ Ceti stars
- New chemical profiles for the asteroseismology of ZZ Ceti stars
- The core/envelope symmetry in pulsating stars
- Asteroseismological study of massive ZZ Ceti stars with fully evolutionary models
- Seismological studies of ZZ Ceti stars. I. The model grid and the application to individual stars
- Mapping the ZZ Ceti Instability Strip: Discovery of 6 New Pulsators
- The age-metallicity dependence for white dwarfs
- KIC 4552982: Outbursts and Asteroseismology from the Longest Pseudo-Continuous Light Curve of a ZZ Ceti
- Pure-hydrogen 3D model atmospheres of cool white dwarfs
- Towards a pure ZZ Ceti instability strip
- Discovery of fourteen new ZZ Cetis with SOAR
- Discovery of eleven new ZZ Ceti stars
- Astrophysical Implications of a New Dynamical Mass for the Nearby White Dwarf 40 Eridani B
- New developments of the ZZ Ceti instability strip: The discovery of eleven new variables
- Evidence for Temperature Change and Oblique Pulsation from Light Curve Fits of the Pulsating White Dwarf GD 358
- The white dwarf mass-radius relation and its dependence on the hydrogen envelope
- Precision asteroseismology of the pulsating white dwarf GD 1212 using a two-wheel-controlled Kepler spacecraft
- Detections and Constraints on White Dwarf Variability from Time-Series GALEX Observations
- A Study of Cool White Dwarfs in the Sloan Digital Sky Survey Data Release 12
- Probing the structure of Kepler ZZ Ceti stars with full evolutionary models-based asteroseismology
- New ZZ Ceti stars from the LAMOST survey
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- Gaia Data Release 3: Cross-match of Gaia sources with variable objects from the literature
- Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS
- Searching for ZZ Ceti White Dwarfs in the Gaia Survey
- Uncovering the chemical structure of the pulsating low-mass white dwarf SDSS J115219.99+024814.4
- Asteroseismology of PG 1541651 and BPM 31594 with TESS
- Pulsation in the white dwarf HE 1017-1352: confirmation of the class of hot DAV stars
- Astrophysical Searches and Constraints on Ultralight Bosonic Dark Matter
- Seismic test of the mass-radius relationship of hydrogen-atmospheric white dwarf stars