J/MNRAS/427/1517 XY And and UZ Vir light curves (Sodor+, 2012)
The light-curve modulation of XY And and UZ Vir:
two Blazhko RR Lyrae stars with additional frequencies.
Sodor A., Hajdu G., Jurcsik J., Szeidl B., Posztobanyi K., Hurta Zs.,
Belucz B., Kun E.
<Mon. Not. R. Astron. Soc., 427, 1517-1529 (2012)>
=2012MNRAS.427.1517S 2012MNRAS.427.1517S
ADC_Keywords: Stars, variable ; Photometry, CCD ; Photometry, UBVRI
Keywords: techniques: photometric - stars: horizontal branch -
stars: individual: XY And - stars: individual: UZ Vir -
stars: oscillations - stars: variables: RR Lyrae
Abstract:
We present a thorough analysis of multicolour CCD observations of two
modulated RRab-type variables, XY And and UZ Vir. These Blazhko stars
show relatively simple light-curve modulation with the usual multiplet
structures in their Fourier spectra. One additional, independent
frequency with linear-combination terms of the pulsation frequency is
also detected in the residual spectrum of each of the two stars. The
amplitude and phase relations of the triplet components are studied in
detail. Most of the epoch-independent phase differences show a slight,
systematic colour dependence. However, these trends have opposite
signs in the two stars. The mean values of the global physical
parameters and their changes with the Blazhko phase are determined,
utilizing the inverse photometric method (IPM). The modulation
properties and the IPM results are compared for the two variables. The
pulsation period of XY And is the shortest when its pulsation
amplitude is the highest, while UZ Vir has the longest pulsation
period at this phase of the modulation. Despite this contrasting
behaviour, the phase relations of the variations in their mean
physical parameters are similar. These results do not agree with the
predictions of the Blazhko model of Stothers.
Description:
Multicolour CCD observations of XY And and UZ Vir were obtained
between 2008 February and 2009 May, and between 2007 October and 2009
January, respectively, with the 60-cm automatic telescope of Konkoly
Observatory at Svabhegy, Budapest, equipped with a 750x1100 Wright
Instruments CCD camera. In the case of UZ Vir, Johnson-Cousins
BVIC filters were used.
Objects:
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RA (2000) DE Designation(s)
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01 26 42.43 +34 04 06.9 XY And = V* XY And
13 08 44.32 +13 24 08.4 UZ Vir = V* UZ Vir
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 76 57 Light-curve solution of XY And in V and Ic bands
table6.dat 102 84 Light-curve solution of UZ Vir in B, V and Ic bands
tablea1.dat 25 2611 *CCD ΔV observations and derived colour
indices of XY And
tablea2.dat 18 2610 *CCD ΔIc observations of XY And
tablea3.dat 32 1695 *CCD ΔV observations and derived colour
indices of UZ Vir
tablea4.dat 18 1722 *CCD ΔB observations of UZ Vir
tablea5.dat 18 1676 *CCD ΔIc observations of UZ Vir
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Note on tablea1.dat and tablea2.dat:
relative to the comparison star 2MASS 01270016+3404307.
Note on tablea3.dat, tablea4.dat and tablea5.dat:
relative to the comparison star 2MASS 13082756+1322403.
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See also:
J/AJ/107/679 : AH Cam (Silbermann+, 1994)
J/A+A/430/1049 : RR Gem BV(RI)c differential photometry (Jurcsik+, 2005)
J/A+A/469/1033 : UBVRI light curves of RR Gem (Sodor+, 2007)
J/MNRAS/391/164 : MW Lyr BV(RI)c light curves (Jurcsik+, 2008)
J/MNRAS/397/350 : DM Cyg BVIc light curves (Jurcsik+, 2009)
J/MNRAS/411/1585 : CZ Lac multiperiodic Blazhko modulation (Sodor+, 2011)
J/A+A/520/A108 : CoRoT 101128793 light curves (Poretti+, 2010)
J/MNRAS/415/1577 : CoRoT 105288363 Blazhko modulation (Guggenberger+, 2011)
J/A+A/527/A146 : CoRoT 0105288363 light curves (Chadid+, 2011)
J/MNRAS/420/1333 : NGC 5024 RR Lyrae VI light curves (Arellano Ferro+, 2012)
J/A+A/549/A101 : Known Galactic field Blazhko stars (Skarka, 2013)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- ID Frequency identification (G1)
14- 24 F11.8 d-1 Freq Frequency value
26- 31 F6.4 mag AV Amplitude in V band for this frequency
33- 38 F6.4 mag e_AV 1σ error on phiV
40- 44 F5.3 rad phiV Phase in V band for this frequency (1)
46- 50 F5.3 rad e_phiV 1σ error on phiV
52- 57 F6.4 mag AIc Amplitude in Ic band for this frequency
59- 64 F6.4 mag e_AIc 1σ error on AIc
66- 70 F5.3 rad phiIc Phase in Ic band for this frequency (1)
72- 76 F5.3 rad e_phiIc 1σ error on phiIc
--------------------------------------------------------------------------------
Note (1): Phases correspond to sine decomposition and to
T0=2454390.0 HJD epoch.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- ID Frequency identification (G1)
14- 24 F11.8 d-1 Freq Frequency value
26- 31 F6.4 mag AB Amplitude in B band for this frequency
33- 38 F6.4 mag e_AB 1σ error on phiB
40- 44 F5.3 rad phiB Phase in B band for this frequency (1)
46- 50 F5.3 rad e_phiB 1σ error on phiB
52- 57 F6.4 mag AV Amplitude in V band for this frequency
59- 64 F6.4 mag e_AV 1σ error on phiV
66- 70 F5.3 rad phiV Phase in V band for this frequency (1)
72- 76 F5.3 rad e_phiV 1σ error on phiV
78- 83 F6.4 mag AIc Amplitude in Ic band for this frequency
85- 90 F6.4 mag e_AIc 1σ error on AIc
92- 96 F5.3 rad phiIc Phase in Ic band for this frequency (1)
98-102 F5.3 rad e_phiIc 1σ error on phiIc
--------------------------------------------------------------------------------
Note (1): Phases correspond to sine decomposition and to
T0=2454504.0 HJD epoch.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 18 F6.3 mag DVmag Differential V magnitude
20- 25 F6.3 mag DV-Ic ?=99.999 Differential V-Ic colour index
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Byte-by-byte Description of file: tablea2.dat tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 18 F6.3 mag DIcmag Differential Ic magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 18 F6.3 mag DVmag Differential V magnitude
20- 25 F6.3 mag DB-V ?=99.999 Differential B-V colour index
27- 32 F6.3 mag DV-Ic ?=99.999 Differential V-Ic colour index
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Byte-by-byte Description of file: tablea4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 18 F6.3 mag DBmag Differential B magnitude
--------------------------------------------------------------------------------
Global Notes:
Note (G1): The frquency is composed of multiples of the pulsation frequency
(f0) and the modulation frequency (fm).
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Aug-2013