J/MNRAS/413/2709 BVRI light curves of KIC Cepheids (Szabo+, 2011)
Cepheid investigations using the Kepler space telescope.
Szabo R., Szabados L., Ngeow C.-C., Smolec R., Derekas A., Moskalik P.,
Nuspl J., Lehmann H., Furesz G., Molenda-Zakowicz J., Bryson S.T.,
Henden A.A., Kurtz D.W., Stello D., Nemec J.M., Benko J.M., Berdnikov L.,
Bruntt H., Evans N.R., Gorynya N.A., Pastukhova E.N., Simcoe R.J.,
Grindlay J.E., Los E.J., Doane A., Laycock S.G., Mink D.J., Champine G.,
Sliski A., Handler G., Kiss L.L., Kollath Z., Kovacs J.,
Christensen-Dalsgaard J., Kjeldsen H., Allen C., Thompson S.E.,
Van Cleve J.
<Mon. Not. R. Astron. Soc., 413, 2709-2720 (2011)>
=2011MNRAS.413.2709S 2011MNRAS.413.2709S
ADC_Keywords: Stars, variable ; Photometry, UBVRI
Keywords: techniques: photometric - techniques: spectroscopic -
stars: individual: V1154 Cygni, KIC 7548061 -
stars: individual: V2279 Cygni, KIC 8022670 - stars: oscillations -
stars: variables: Cepheids
Abstract:
We report results of initial work done on selected candidate Cepheids
to be observed with the Kepler space telescope. Prior to the launch,
40 candidates were selected from previous surveys and data bases. The
analysis of the first 322d of Kepler photometry, and recent
ground-based follow-up multicolour photometry and spectroscopy allowed
us to confirm that one of these stars, V1154 Cyg (KIC 7548061), is
indeed a 4.9d Cepheid. Using the phase lag method, we show that this
star pulsates in the fundamental mode. New radial velocity data are
consistent with previous measurements, suggesting that a long-period
binary component is unlikely. No evidence is seen in the ultraprecise,
nearly uninterrupted Kepler photometry for non-radial or
stochastically excited modes at the micromagnitude level. The other
candidates are not Cepheids, but an interesting mix of possible
spotted stars, eclipsing systems and flare stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 5 Main properties of the observed Kepler Cepheid
and Cepheid candidates
table2.dat 41 1685 Ground-based BVRcIc photometry of Kepler
Cepheid V1154 Cygni and Cepheid candidates
table3.dat 74 81 Table of O-C residuals for V2279 Cyg
table4.dat 53 11 Frequencies, amplitudes and phases of the
identified frequency peaks in the frequency
spectrum of V1154 Cyg based on Q1-Q4 LC data
table5.dat 87 114 Table of O-C residuals for V1154 Cyg
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See also:
V/133 : Kepler Input Catalog (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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1- 8 I8 --- KIC KIC number (Cat. V/133)
10- 35 A26 --- Name Other name of the star
37- 38 I2 h RAh Right ascension (J2000)
40- 41 I2 min RAm Right ascension (J2000)
43- 47 F5.2 s RAs Right ascension (J2000)
49 A1 --- DE- Declination sign (J2000)
50- 51 I2 deg DEd Declination (J2000)
53- 54 I2 arcmin DEm Declination (J2000)
56- 60 F5.2 arcsec DEs Declination (J2000)
62- 67 F6.3 mag Kp Kepler magnitude
69- 77 F9.6 d Per Period
79- 85 F7.6 d e_Per rms uncertainty on Per
87- 91 F5.3 --- CI [0/1] Contamination index (1)
93-111 A19 --- Runs Runs (2)
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Note (1): CI=0 means that all the flux in the aperture comes from the
target and in the case of CI=1 the flux entirely comes from
surrounding sources.
Note (2): Q3.1 means the first month of Q3 (third quarter)
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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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1- 8 I8 --- KIC KIC number
10- 21 F12.4 d HJD Heliocentric Julian date
23- 28 F6.3 mag mag Magnitude in Filter
30- 34 F5.3 mag e_mag ?=9.999 rms uncertainty on mag
36 A1 --- Filt [BVRI] Filter (Johnson-Cousins)
39- 41 A3 --- Obs Observatory code (1)
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Note (1): Observatory code as follows:
SRO = Sonoita Research Obervatory (USA):
0.35-m robotic telescope with a SBIG STL-1001E CCD
LOT = Lulin One-meter Telescope at the Lulin Observatory (Taiwan):
1-m Cassegrain-telescope with PI1300B CCD
SLT = SLT, Lulin Obervatory (Taiwan):
0.4-m RC-telescope with Apogee U9000 CCD
TNG = Tenagra telescope at the Tenagra II Observatory (USA):
robotic 0.8-m RC-telescope with SITe CCD
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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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1- 12 F12.4 d HJD Heliocentric Julian date
14- 17 I4 --- E Epoch number
21- 27 F7.4 d O-C O-C residual (1)
31 I1 --- Weight Weight
35- 74 A40 --- Ref Reference
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Note (1): O-C residuals resulted in the best-fitting period of 4.125642d.
C=BJD(2454954.6109±0.0023)+(4.125642±0.000051)E
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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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1- 4 A4 --- ID Frequency designation
6- 14 F9.7 d-1 Freq Frequency
16- 24 F9.7 d-1 e_Freq rms uncertainty on Freq
26- 33 F8.6 mag Amp Amplitude (1)
36- 43 F8.6 rad phi Phase
46- 53 F8.6 rad e_phi rms uncertainty on phi
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Note (1): The formal uncertainty (1σ) of the amplitudes is uniformly
0.000024.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
15- 19 I5 --- E Epoch number
22- 28 F7.4 d O-C O-C residual (1)
32 I1 --- Weight Weight
39- 41 A3 --- Filt Filter
45- 87 A43 --- Ref Reference/Instrument
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Note (1): C=BJD(2454955.7260±0.0008)+(4.925454±0.000001)E
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Dec-2011