J/MNRAS/478/2676 New white dwarf pulsators for TESS (Bognar+, 2018)
Searching for new white dwarf pulsators for TESS observations at Konkoly
Observatory.
Bognar Zs., Kalup Cs., Sodor A., Charpinet S., Hermes J.J.
<Mon. Not. R. Astron. Soc., 478, 2676-2685 (2018)>
=2018MNRAS.478.2676B 2018MNRAS.478.2676B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, white dwarf ; Photometry, CCD
Keywords: techniques: photometric - stars: individual: WD 1310+583, EGGR 120 -
stars: interiors - stars: oscillations - white dwarfs
Abstract:
We present the results of our survey searching for new white dwarf
pulsators for observations by the TESS space telescope. We collected
photometric time-series data on 14 white dwarf variable candidates at
Konkoly Observatory, and found two new bright ZZ Ceti stars, namely
EGGR 120 and WD 1310+583. We performed a Fourier analysis of the
datasets. In the case of EGGR 120, which was observed on one night
only, we found one significant frequency at 1332uHz with 2.3mmag
amplitude. We successfully observed WD 1310+583 on eight nights, and
determined 17 significant frequencies in the whole dataset. Seven of
them seem to be independent pulsation modes between 634 and 2740uHz,
and we performed preliminary asteroseismic investigations of the star
utilizing six of these periods. We also identified three new light
variables on the fields of white dwarf candidates: an eclipsing
binary, a candidate delta Scuti/beta Cephei and a candidate W UMa-type
star.
Description:
We collected photometric time-series data on 14 white dwarf variable
candidates at Konkoly Observatory, and found two new bright ZZ Ceti
stars, namely EGGR 120 and WD 1310+583. We used the 1-m
Ritchey-Chretien-Coude telescope at the Piszkesteto mountain station
of Konkoly Observatory. We obtained data with an Andor iXon+888 EMCDD
and an FLI Proline 16803 CCD camera in white light.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 78 14 *List of studied stars
lc/* . 14 Individual files for CCD observations at
Konkoly Observatory
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Note on stars.dat: parameters from table5 of the paper.
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
36- 46 A11 --- SpType Spectral type
48- 52 I5 K Teff Effective temperature
54- 57 F4.2 [cm/s2] logg Surface gravity
58 A1 --- n_logg [GBL] Note on logg and Teff (1)
60- 63 F4.1 mag TESSmag TESS magnitude
64- 66 A3 --- n_TESSmag Note on TESSmag
68- 78 A11 --- FileName Name of the light curve file in
subdirectory lc
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Note (1): References a sfollows:
G = source of the original physical parameters is the database of
Gianninas, Bergeron & Ruiz (2011, Cat. J/ApJ/743/138).
We corrected these Teff and logg values according to the findings of
Tremblay et al. (2013A&A...559A.104T 2013A&A...559A.104T) based on radiation-hydrodynamics
three-dimensional simulations of convective DA stellar atmospheres
L = source of the parameters was either Limoges, Bergeron & Lepine
(2015, Cat. J/ApJS/219/19)
B = Bergeron et al. (2011ApJ...737...28B 2011ApJ...737...28B)
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 17 F17.9 d BJD Barycentric Julian dates in Barycentric
Dynamical Time (BJD_TDB)
19- 29 F11.8 mag Dmag Differential magnitude
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Acknowledgements:
Zsofia Bognar, bognar(at)konkoly.hu
(End) Zsofia Bognar [Konkoly Obs.], Patricia Vannier [CDS] 27-Jul-2018