J/MNRAS/423/993 BVI light curves of RZ Lyr (Jurcsik+, 2012)
An extensive photometric study of the Blazhko RR Lyrae star RZ Lyr.
Jurcsik J., Sodor A., Hajdu G., Szeidl B., Dozsa A., Posztobanyi K.,
Smitola P., Belucz B., Feher V., Kovari Zs., Kriskovics L., Kun E.,
Molnar L., Nagy I., Vida K., Gorog N.
<Mon. Not. R. Astron. Soc., 423, 993-1005 (2012)>
=2012MNRAS.423..993J 2012MNRAS.423..993J
ADC_Keywords: Stars, variable ; Photometry
Keywords: methods: data analysis - techniques: photometric -
stars: horizontal branch - stars: individual: RZ Lyr -
stars: oscillations - stars: variables: RR Lyrae
Abstract:
The analysis of recent, extended multicolour CCD and archive
photoelectric, photographic and visual observations has revealed
several important properties of RZ Lyr, an RRab-type variable
exhibiting large-amplitude Blazhko modulation. On the time base of
∼110yr, a strict anticorrelation between the pulsation- and
modulation-period changes is established. The light curve of RZ Lyr
shows a remarkable bump on the descending branch in the
small-amplitude phase of the modulation, similarly to the light curves
of bump Cepheids. We speculate that the stellar structure temporally
suits a 4:1 resonance between the periods of the fundamental and one
of the higher order radial modes in this modulation phase. The
light-curve variation of RZ Lyr can be correctly fitted with a
two-modulation-component solution; the 121-d period of the main
modulation is nearly but not exactly four times longer than the period
of the secondary modulation component. Using the inverse photometric
method, the variations in the pulsation-averaged values of the
physical parameters in different phases of both modulation components
are determined.
Description:
A total number of about 1400 photographic exposures were taken with
the 16-cm astrograph of the Konkoly Observatory at Budapest between
1950 and 1954, on 130 plates. The plates were digitalized using an
EPSON Perfection V750 flatbed transparency scanner.
Photoelectric observations of RZ Lyr were collected with the 60-cm
telescope of the Konkoly Observatory in 1958, 1959 with RCA 1P21, and
in 1968, 1969 and 1972 with EMI 9052 B photomultiplier tubes.
Objects:
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RA (2000) DE Designation(s) (Period[d])
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18 43 37.88 +32 47 54.0 RZ Lyr = AN 19.1903 (0.5112419)
18 43 18.42 +32 48 58.7 V1 = 2MASS J18431843+3248587 (0.927033)
18 43 53.77 +32 47 45.9 V2 = 2MASS J18435377+3247459 (1.447245)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 25 8981 Konkoly photometric observations of RZ Lyr
table3.dat 34 191 Times and brightnesses of maxima redetermined from
published visual and photoelectric light curves
and determined from the Konkoly observations
table6.dat 101 114 Frequencies, amplitudes and phases of the B, V
and Ic light-curve solutions of RZ Lyr
tablea1.dat 22 11083 Konkoly CCD observations of the two new variables
discovered in the field of RZ Lyr
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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- 10 F10.4 d HJD Heliocentric Julian date (HJD-2400000)
12- 17 F6.3 mag mag Magnitude in Band
19- 21 A3 --- Det Detector: CCD, pe=photoelectric, pg=photographic
23 A1 --- Band [BVI] Filter (no filter for pg)
25 A1 --- Comp [a-d] Comparison star (1)
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Note (1): Comparison stars as follows:
a = 2MASS 18432371+3253475
b = 2MASS 18434732+3256105
c = 2MASS 18435761+3249546
d = 2MASS 18443148+3257263
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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- 10 F10.4 d HJD Heliocentric Julian date (HJD-2400000)
12- 17 F6.3 mag Bmag ? pg/B magnitude
19- 24 F6.3 mag Vmag ? vis/V magnitude
25 A1 --- u_Vmag Uncertainty flag on Vmag
27- 32 F6.3 mag Icmag ? Cousins I magnitude
34 I1 --- Ref References (1)
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Note (1): References as follows:
1 = Tsessevich (1953, Gosudarstvennyi Astronomicheskij Institut
Sternberga, 23, 62)
2 = Zverev & Makarenko (1979PZP.....3..431Z 1979PZP.....3..431Z)
3 = this paper
5 = Fitch et al. (1966CoLPL...5...71F 1966CoLPL...5...71F)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Ident Identification of the frequency mode (1)
14- 23 F10.7 d-1 f Frequency
25- 30 F6.4 mag Bamp Amplitude in B band
32- 37 F6.4 mag e_Bamp rms uncertainty (1σ) in Bamp
39- 44 F6.4 rad Bphi Phase φ in B band (2)
45- 50 F6.4 rad e_Bphi rms uncertainty (1σ) in B band
51- 56 F6.4 mag Vamp Amplitude in V band
58- 63 F6.4 mag e_Vamp rms uncertainty (1σ) in Vamp
65- 69 F5.3 rad Vphi Phase in V band (2)
71- 75 F5.3 rad e_Vphi rms uncertainty (1σ) in V band
77- 82 F6.4 mag Iamp Amplitude in I band
84- 89 F6.4 mag e_Iamp rms uncertainty (1σ) in Iamp
91- 95 F5.3 rad Iphi Phase in I band (2)
97-101 F5.3 rad e_Iphi rms uncertainty (1σ) in I band
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Note (1): Magnitude zero points relative to comparison star "a" are
Bmag=0.548, Vmag=0.658, Icmag=0.696
Note (2): Phases in range [0,2π] correspond to cosine decomposition
and to T0= 2455294.0 HJD epoch.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Star Variable name (V1 or V2) (1)
4- 13 F10.4 d HJD Heliocentric Julian date (HJD-2400000)
15- 20 F6.3 mag mag Magnitude in Band
22 A1 --- Band [BVI] Filter
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Note (1): Basic information on the new variables.
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2MASS Vmag B-V V-Ic Type Period T0(HJD)
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V1 18431843+3248587 11.82 0.23 0.28 EB 0.927033(6) 2455353.390
V2 18435377+3247459 14.19 0.77 0.86 EA 1.447245(6) 2455396.370
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Apr-2013