J/MNRAS/397/350 DM Cyg BVIc light curves (Jurcsik+, 2009)
An extensive photometric study of the blazhko RR Lyrae star DM Cyg.
Jurcsik J., Hurta Zs., Sodor A., Szeidl B., Nagy I., Posztobanyi K.,
Varadi M., Vida K., Belucz B., Dekany I., Hajdu G., Kovari Zs., Kun E.
<Mon. Not. R. Astron. Soc., 397, 350-360 (2009)>
=2009MNRAS.397..350J 2009MNRAS.397..350J
ADC_Keywords: Stars, variable ; Photometry, VRI ;
Keywords: methods: data analysis - techniques: photometric -
stars: horizontal branch - stars: individual: DM Cyg -
stars: variables: other
Abstract:
DM Cyg, a fundamental mode RRab star, was observed in the 2007 and
2008 seasons in the framework of the Konkoly Blazhko Survey. Very
small amplitude light-curve modulation was detected with 10.57d
modulation period. The maximum brightness and phase variations do not
exceed 0.07mag and 7min, respectively. In spite of the very small
amplitude of the modulation, beside the frequency triplets
characterizing the Fourier spectrum of the light curve, two quintuplet
components were also identified. The accuracy and the good phase
coverage of our observations made it possible to analyse the light
curves at different phases of the modulation separately.
Description:
CCD observations were obtained with the automated 60cm telescope of
the Konkoly Observatory, Svabhegy, Budapest, equipped with a Wright
Instruments 750x1100 CCD camera and BVIC filters. Measurements were
taken on 81 nights between 2007 July and 2008 September.
Objects:
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RA (2000) DE Designation(s)
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21 21 11.5 +32 11 29 DM Cyg = V* DM Cyg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 28 14329 Time series of the CCD BVIc magnitude and
B-V, V-Ic colour index differences of DM Cyg
phot.dat 23 148 Photoelectric BV observations of DM Cyg
pg.dat 21 1018 Photographic observations of DM Cyg
table3.dat 76 51 *Fourier amplitudes and phases of the pulsation
and modulation frequencies in DM Cyg
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Note on table3.dat: Initial epoch corresponds to maximum of both the pulsation
and the modulation light variations as given in equations
(1) (Tmax,puls=2454312.514[HJD]+0.419863*Epuls) and
(2) (Tmax,BI=2454312.514[HJD]+10.57*EBI), where Epuls and EBl denote the
epoch number of the pulsation and modulation cycles, respectively.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
16- 22 F7.4 mag Dmag Differential magnitude in Band (1)
25- 28 A4 --- Band [BVIc-] Johnson-Cousins band (or colour)
of the magnitude
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Note (1): relative to the mean magnitude of
GSC2.2 N0330220980 (21:21:30.731 +32:13.05.78) and
GSC2.2 N03302207371 (21:20:59.483 +32:13.01.63).
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Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
16- 21 F6.3 mag Dmag Differential magnitude in Band (1)
23 A1 --- Band [BV] Band of magnitude
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Note (1): relative to the mean magnitude of
GSC2.2 N03302207371 (21:20:59.483 +32:13.01.63).
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Byte-by-byte Description of file: pg.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocantric Julian date
16- 21 F6.3 mag pgmag Photographic magnitude
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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- 7 A7 --- Name Frequency designation
10- 18 F9.6 d-1 Freq Frequency
20- 25 F6.4 mag Bamp Amplitude in B band
27- 31 F5.3 rad Bphi [0/6.28] Phase in B band
33- 38 F6.4 mag Vamp Amplitude in V band
40- 44 F5.3 rad Vphi [0/6.28] Phase in V band
46- 51 F6.4 mag Icamp Amplitude in Ic band
53- 57 F5.3 rad Icphi [0/6.28] Phase in Ic band
59- 64 F6.4 mag Vttamp Amplitude in Vtt band (1)
66- 70 F5.3 rad Vttphi [0/6.28] Phase in Vtt band (1)
72- 76 F5.3 rad e_Vttphi rms uncertainty on Vttphi
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Note (1): Fourier parameters of the time transformed V data.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Apr-2011