J/A+A/534/A125 Variability of A- and F-stars from Kepler (Uytterhoeven+ 2011)
The Kepler characterization of the variability among A- and F-type stars.
I. General overview
Uytterhoeven K., Moya A., Grigahcene A., Guzik J.A., Gutierrez-Soto J.,
Smalley B., Handler G., Balona L.A., Niemczura E., Fox Machado L.,
Benatti S., Chapellier E., Tkachenko A., Szabo R., Suarez J.C., Ripepi V.,
Pascual J., Mathias P., Martin-Ruiz S., Lehmann H., Jackiewicz J.,
Hekker S., Gruberbauer M., Garcia R.A., Dumusque X., Diaz-Fraile D.,
Bradley P., Antoci V., Roth M., Leroy B., Murphy S.J., De Cat P.,
Cuypers J., Kjeldsen H., Christensen-Dalsgaard J., Breger M., Pigulski A.,
Kiss L.L., Still M., Thompson S.E., Van Cleve J.
<Astron. Astrophys. 534, A125 (2011)>
=2011A&A...534A.125U 2011A&A...534A.125U
ADC_Keywords: Stars, variable ; Stars, A-type ; Stars, F-type ; Photometry ;
Binaries, eclipsing ; Effective temperatures
Keywords: stars: oscillations - stars: fundamental parameters -
binaries: general - asteroseismology - stars: variables: delta Scuti -
stars: statistics
Abstract:
The Kepler spacecraft is providing time series of photometric data
with micromagnitude precision for hundreds of A-F type stars. We
present a first general characterization of the pulsational behaviour
of A-F type stars as observed in the Kepler light curves of a sample
of 750 candidate A-F type stars, and observationally investigate the
relation between γ Doradus (γ Dor), δ Scuti (δ
Sct), and hybrid stars.
Description:
We compile a database of physical parameters for the sample stars from
the literature and new ground-based observations. We analyse the
Kepler light curve of each star and extract the pulsational
frequencies using different frequency analysis methods. We construct
two new observables, 'energy' and 'efficiency', related to the driving
energy of the pulsation mode and the convective efficiency of the
outer convective zone, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 148 750 Database of 750 Kepler A-F stars
table2.dat 170 750 Effective temperature, gravity and rotation
velocities for the 750 stars
notes.dat 80 64 Notes and references to table1 and table2
table3.dat 76 477 Classification and characterization of δ Sct,
γ Dor and hybrid stars
table4.dat 32 273 Classification of the stars that do not belong
to the δ Sct, γ Dor or hybrid groups
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See also:
V/133 : Kepler Input Catalog (KIC, Kepler Mission Team, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 9 I8 --- KIC Kepler Input Catalogue identifier (Cat. V/133)
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 21 F5.2 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 33 F4.1 arcsec DEs Declination (J2000.0)
35- 38 F4.1 mag Kp Kepler magnitude
41- 66 A26 --- SpType MK Spectral type (reference embedded)
68- 84 A17 --- Names Other name(s)
86-115 A30 --- Notes Remarks about the nature of the star
(embedded references)
116-121 I6 --- Ndat Number of Kepler datapoints
123-127 F5.1 d Tspan Total timespan of the Kepler lightcurve
129-133 F5.1 d Tgap Longest timegap in the Kepler lightcurve
135-139 A5 --- Q.LC Available quarters in Long Cadence mode
142-148 A7 --- Q.SC Available quarters in Short Cadence mode
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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2- 9 I8 --- KIC Kepler Input Catalogue identifier
11 A1 --- n_KIC [o] indicates a spectroscopic binary
15- 19 I5 K TeffK ? Effective temperature from KIC (1)
21- 25 I5 K Teff1 ? Effective temperature from the literature
27- 30 I4 K e_Teff1 ? Error on Teff1
31 A1 --- r_Teff1 Reference for Teff1
36- 40 I5 K Teff2 ? Effective temperature from the literature
44- 46 I3 K e_Teff2 ? Error on Teff2
47 A1 --- r_Teff2 Reference for Teff2
50- 54 I5 K Teff3 ? Effective temperature from the literature
58- 60 I3 K e_Teff3 ? Error on Teff3
61 A1 --- r_Teff3 Reference for Teff3
65- 69 I5 K Teff ? Adopted effective temperature
72- 75 I4 K e_Teff ? Error on the adopted effective temperature
77 A1 --- r_Teff Reference for Teff
81- 84 F4.2 [cm/s2] loggK ? logg value from KIC (2)
86- 89 F4.2 [cm/s2] logg1 ? logg value from the literature
93- 96 F4.2 [cm/s2] e_logg1 ? Error on the logg value from the literature
97 A1 --- r_logg1 Reference for logg1
103-106 F4.2 [cm/s2] logg2 ? logg value from the literature
110-113 F4.2 [cm/s2] e_logg2 ? Error on the logg value from the literature
114 A1 --- r_logg2 Reference for logg2
120-123 F4.2 [cm/s2] logg ? Adopted logg value
127-130 F4.2 [cm/s2] e_logg ? Error on the adopted logg value
131 A1 --- r_logg Reference for n_logg
136-140 F5.1 km/s vsini1 ? vsini value from the literature
142-143 I2 km/s e_vsini1 ? Error on vsini1
144 A1 --- r_vsini1 Reference for vsini1
159-163 F5.1 km/s vsini2 ? vsini value from the literature
165-166 I2 km/s e_vsini2 ? Error on vsini2
168-170 A3 --- r_vsini2 Reference for vsini2
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Note (1): The estimated error on the effective temperature is 290K
Note (2): The estimated error on the logg value is 0.3[cm/s2]
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Note Note number
4- 80 A77 --- Text Text of note
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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2- 9 I8 --- KIC Kepler Input Catalogue identifier
11- 16 A6 --- Class Classification as dSct (δ Scuti), hybrid
or gDor (γ Doradus) (G1)
18- 21 I4 --- N Number of independent frequencies
23- 25 I3 --- Ng Number of independent γ Doradus-type
frequencies
27- 29 I3 --- Nd Number of independent δ Scuti-type
frequencies
31- 34 I4 --- Ntot Total number of detected frequencies
36 A1 --- --- [[]
37- 40 F4.1 d-1 fg.min ? Lower boundary of the detected frequency range
for γ Doradus (gDor)-type frequencies
41 A1 --- --- [,]
42- 45 F4.1 d-1 fg.max ? Upper boundary of the detected frequency range
for γ Doradus (gDor)-type frequencies
46 A1 --- --- []]
48 A1 --- --- [[]
49- 52 F4.1 d-1 fd.min ? Lower boundary of the detected frequency range
for δ Scuti (dSct)-type frequencies
53 A1 --- --- [,]
54- 58 F5.1 d-1 fd.max ? Upper boundary of the detected frequency range
for δ Scuti (dSct)-type frequencies
59 A1 --- --- []]
62- 67 I6 10-6 amp Highest detected amplitude (in ppm)
69- 74 F6.3 d-1 f Frequency associated to the highest amplitude
76 A1 --- Flag [*] Flag indicating a high contamination factor
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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2- 9 I8 --- KIC Kepler Input Catalogue identifier
11- 30 A20 --- Class Classification (G1)
32 A1 --- Flag [*] Flag indicating a high contamination factor
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Global Notes:
Note (G1): the classes are:
Bstar = B star
SPB = slowly pulsating B star
bCep = β Cep variable
Cepheid = classical (δ Cep) variable
EB = eclipsing binary
dSct = δ Scuti variable
gDor = γ Doradus variable
hybrid = hybrid star
binary = binary star
contaminated = contaminated star
red giant = red giant star
solar-like = solar-like star
rotation/activity = rotationally modulated/active star
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Acknowledgements:
Katrien Uytterhoeven, katrien(at)iac.es
(End) Francois Ochsenbein [CDS] 23-Jul-2011