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J/other/NewA/51.59         LY And photometric followup               (Lu+, 2017)

Photometric followup investigations on LAMOST survey target LY And. Lu H.-P., Zhang L.-Y., Han X.L., Pi Q.-F., Wang D.-M. <New Astron., 51, 59-64 (2017)> =2017NewA...51...59L (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI Keywords: binaries: close - binaries: eclipsing - stars: period variation - stars: individual: LY And Abstract: We present a low-dispersion spectrum and two sets of CCD photometric light curves of the eclipsing binary LY And for the first time. The spectrum of LY And was classified as G2. We derived an updated ephemeris based on all previously available and our newly acquired minimum light times. Our analyses of LY And light curve minimum times reveals that the differences between calculated and observed minimum times for LY And can be represented by an upward parabolic curve, which means its orbital period is increasing with a rate of 1.88 (±0.13)x10-7days/year. This increase in orbital period may be interpreted as mass transfer from the primary component to the secondary component, with a rate of dM1/dt=-4.54x10-8M/year. By analyzing our CCD photometric light curves obtained in 2015, we obtained its photometric solution with the Wilson-Devinney program. This photometric solution also fits very well our light curves obtained in 2014. Our photometric solution shows that LY And is a contact eclipsing binary and its contact factor is f=(17.8±1.9)%. Furthermore, both our spectroscopic and photometric data show no obvious chromospheric activity of LY And. Description: We obtained our first photometric data set in R and I bands for LY And on November 24, 2014 using the 1-m RCC reflecting telescope at Yunnan Observatory, which was equipped with an Andor DW436 2048x2048 CCD camera with a field of view of 7.3'x7.3'. The exposure times were 300s for both R and I bands. We obtained our second photometric data set in B, V, R and I bands using the SARA 914-mm telescope at Kitt Peak National Observatory on October 23, 2015. This telescope was equipped with a 2048x2048 pixels CCD and each pixel after 2x2 binning is about 0.86". The exposure times were 120s in B band and 60 s in V, R and I bands, respectively. Objects: ---------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------- 02 21 52.49 +38 37 42.2 LY And = V* LY And ---------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 39 50 Original photometric data of LY And observed by the 1-m RCC reflecting telescope at Yunnan Observatory on November 24, 2014 table3.dat 79 117 Original photometric data of LY And observed by the 914-mm SARA telescope at Kitt Peak National Observatory on October 23, 2015 table5.dat 58 81 Minimum times and their relevant parameters of LY And
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJD-R Heliocentric Julian date for R-band 15- 19 F5.3 mag dRmag Differential R magnitude 21- 33 F13.5 d HJD-I ? Heliocentric Julian date for I-band 35- 39 F5.3 mag dImag ? Differential I magnitude
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJD-B Heliocentric Julian date for B-band 15- 19 F5.3 mag dBmag Differential B magnitude 21- 33 F13.5 d HJD-V Heliocentric Julian date for V-band 35- 39 F5.3 mag dVmag Differential V magnitude 41- 53 F13.5 d HJD-R Heliocentric Julian date for R-band 55- 59 F5.3 mag dRmag Differential R magnitude 61- 73 F13.5 d HJD-I Heliocentric Julian date for I-band 75- 79 F5.3 mag dImag Differential I magnitude
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJD Heliocentric Julian date 15- 21 F7.5 d e_HJD ? rms uncertainty on HJD 23- 30 F8.1 d Epoch Epoch 32- 34 A3 --- Meth [pg ccd] Method 36- 38 A3 --- Type [pri sec] Type of minima 40 I1 --- Weight [1/5] Weight 42- 48 F7.4 d (O-C)I Observed minus computer for primary minimum 50- 56 F7.4 d (O-C)II Observed minus computer for secondary minimum 58 I1 --- Ref [1/9] Reference (1)
Note (1): References as follows: 1 = http://var2.astro.cz/EN/; Paschke & Brat 2006 2 = Otero et al. (2006IBVS.5674....1O ) 3 = Brat et al. (2008OEJV...94....1B) 4 = Brat et al. (2011OEJV..137....1B) 5 = Diethelm (2011IBVS.5960....1D) 6 = Honkova et al. (2013EJV..160....1H) 7 = Diethelm (2012IBVS.6011....1D) 8 = Diethelm (2013IBVS.6042....1D) 9 = This paper
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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