J/AJ/162/63 ZTF light curve of 51 stars in 12 globular clusters (Ngeow+, 2021)
Zwicky Transient facility and globular clusters: the period-luminosity and
Period-Luminosity-Color relations for late-type contact binaries.
Ngeow C.-C., Liao S.-H., Bellm E.C., Duev D.A., Graham M.J., Mahabal A.A.,
Masci F.J., Medford M.S., Riddle R., Rusholme B.
<Astron. J., 162, 63-63 (2021)>
=2021AJ....162...63N 2021AJ....162...63N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular; Stars, variable; Stars, double and multiple;
Photometry, RI
Keywords: Contact binary stars; Globular star clusters; Sky surveys
Distance indicators
Abstract:
In this work, we aimed to derive the gri-band period-luminosity (PL)
and period-luminosity-color (PLC) relations for late-type contact
binaries, for the first time, located in globular clusters, using the
homogeneous light curves collected by the Zwicky Transient Factory
(ZTF). We started with 79 contact binaries in 15 globular clusters,
and retained 30 contact binaries in 10 globular clusters that have
adequate numbers of data points in the ZTF light curves and are
unaffected by blending. Magnitudes at mean and maximum light of these
contact binaries were determined using a fourth-order Fourier
expansion, while extinction corrections were done using the
Bayerstar2019 3D reddening map together with adopting the homogeneous
distances to their host globular clusters. After removing early-type
and "anomaly" contact binaries, our derived gri-band PL and
period-Wesenheit (PW) relations exhibited a much larger dispersion
with large errors on the fitted coefficients. Nevertheless, the
gr-band PL and PW relations based on this small sample of contact
binaries in globular clusters were consistent with those based on a
larger sample of nearby contact binaries. Good agreements of the PL
and PW relations suggested both samples of contact binaries in the
local Solar neighborhood and in the distant globular clusters can be
combined and used to derive and calibrate the PL, PW, and PLC
relations. The final derived gr-band PL, PW, and PLC relations were
much improved over those based on the limited sample of contact
binaries in the globular clusters.
Description:
Zwicky Transient Factory (ZTF) carried out a multiband time-domain
optical survey on the northern sky using the Samuel Oschin 48inch
Schmidt telescope, located at the Palomar Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 12 Basic properties of the globular clusters
adopted in this work
table2.dat 44 17437 ZTF light curves data for CB in the globular
clusters
refs.dat 62 21 References used for table1
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See also:
V/150 : Updated catalog of variable stars in globular clusters (Clement+ 2017)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/A+A/549/A86 : Period change 143 SuperWASP eclipsing binaries (Lohr+, 2013)
J/MNRAS/434/1220 : Vi light curves of NGC6333 variables (Arellano Ferro+, 2013)
J/A+A/566/A43 : EPOCH Project. EROS-2 LMC periodic variables (Kim+, 2014)
J/MNRAS/442/2381 : Variable stars in M4 primary field (Nascimbeni+, 2014)
J/MNRAS/443/432 : Eclipsing binaries in LMC (Muraveva+, 2014)
J/PASP/126/521 : UBVRIJHK photometry of RR Lyrae in M4 (Stetson+, 2014)
J/AcA/66/405 : Galacticbulge eclipsing & ellipsoidal bin. (Soszynski+,2016)
J/MNRAS/465/2489 : NGC 6401 bulge variable stars (Tsapras+, 2017)
J/AJ/155/116 : Globular cluster M14.II. Variable stars (Contreras Pena+, 2018)
J/ApJ/859/140 : Multi-band magnitudes for W UMa EB* candidates (Chen+, 2018)
J/AJ/158/51 : VR CCD photometry of variable stars in GC NGC4147 (Lata+, 2019)
J/MNRAS/482/5138 : Galactic GC mean pms & velocities (Baumgardt+, 2019)
J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)
J/ApJS/249/31 : Short period spec. &EBs (LPSEB) from LAMOST & PTF (Yang+, 2020)
J/MNRAS/493/1996 : NGC 6712 variable stars VI light curves (Deras+, 2020)
J/MNRAS/499/4026 : NGC6254 variable stars light curves (Arellano Ferro+, 2020)
http://www.ztf.caltech.edu/page/dr3 : ZTF DR3
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Globular Cluster name
10- 11 I2 h RAh [12/21] Hour of right ascension (J2000)
13- 14 I2 min RAm Minute of right ascension (J2000)
16- 20 F5.2 s RAs Second of right ascension (J2000)
22 A1 --- DE- [±] Sign of declination (J2000)
24- 25 I2 deg DEd Degree of declination (J2000)
27- 28 I2 arcmin DEm Arcminute of declination (J2000)
30- 33 F4.1 arcsec DEs Arcsecond of declination (J2000)
35- 39 F5.2 kpc Dist [1.97/18.2] Distance,
from Baumgardt+, J/MNRAS/482/5138
41- 44 F4.2 kpc e_Dist [0.04/0.57]? Error on Dist
46- 49 F4.2 mag E(B-V) [0/0.72] Foregroung reddening (1)
51- 55 F5.2 [Sun] [Fe/H] [-2.37/-0.78] Metallicity (1)
57- 58 I2 --- Ncb [2/20] Number of contact binaries (CBs)
60- 61 I2 --- NcbZTF [1/12] Number of CBs that contain at least one
ZTF data point in any filter
63- 71 A9 --- Ref Reference(s) used
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Note (1): From Harris, 1996, VII/195 and Harris, 2010arXiv1012.3224H 2010arXiv1012.3224H.
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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- 7 A7 -- Cluster Globular Cluster name
9- 15 A7 -- Star Variable star (contact binary) name
17- 17 A1 -- Filt ZTF filter; g, r or i
19- 31 F13.7 d MJD [58045/59123] Modified Julian Date; JD-2400000.5
33- 38 F6.3 mag omag [12.3/21.9] Observed magnitude in Filt
40- 44 F5.3 mag e_omag [0.01/0.4] Magnitude error
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference
4- 25 A22 --- Autor Main autor of the reference
27- 45 A19 --- BIB BIBcode
47- 62 A16 --- Cat. Catalog in Vizier
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 19-Nov-2021