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. =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: -------------------------------------------------------------------- RA (2000) DE Designation(s) (Period[d]) -------------------------------------------------------------------- 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) -------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Note (1): Comparison stars as follows: a = 2MASS 18432371+3253475 b = 2MASS 18434732+3256105 c = 2MASS 18435761+3249546 d = 2MASS 18443148+3257263 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Note (1): References as follows: 1 = Tsessevich (1953, Gosudarstvennyi Astronomicheskij Institut Sternberga, 23, 62) 2 = Zverev & Makarenko (1979PZP.....3..431Z) 3 = this paper 5 = Fitch et al. (1966CoLPL...5...71F) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 (1{sigma}) in Bamp 39- 44 F6.4 rad Bphi Phase {phi} in B band (2) 45- 50 F6.4 rad e_Bphi rms uncertainty (1{sigma}) in B band 51- 56 F6.4 mag Vamp Amplitude in V band 58- 63 F6.4 mag e_Vamp rms uncertainty (1{sigma}) in Vamp 65- 69 F5.3 rad Vphi Phase in V band (2) 71- 75 F5.3 rad e_Vphi rms uncertainty (1{sigma}) in V band 77- 82 F6.4 mag Iamp Amplitude in I band 84- 89 F6.4 mag e_Iamp rms uncertainty (1{sigma}) in Iamp 91- 95 F5.3 rad Iphi Phase in I band (2) 97-101 F5.3 rad e_Iphi rms uncertainty (1{sigma}) in I band -------------------------------------------------------------------------------- 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 [0,2{pi}] correspond to cosine decomposition and to T_0_= 2455294.0 HJD epoch. -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Note (1): Basic information on the new variables. ---------------------------------------------------------------- 2MASS Vmag B-V V-Ic Type Period T0(HJD) ---------------------------------------------------------------- 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 ---------------------------------------------------------------- -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 03-Apr-2013