J/AJ/161/221 Photometry & spectroscopy of 4 binaries stars (Panchal+, 2021)
Photometric and spectroscopic analysis of four contact binaries.
Panchal A., Joshi Y.C.
<Astron. J., 161, 221 (2021)>
=2021AJ....161..221P 2021AJ....161..221P
ADC_Keywords: Stars, double and multiple; Photometry, VRI; Spectra, optical
Keywords: Contact binary stars ; Photometry ; Spectroscopy ;
Eclipsing binary stars ; Starspots
Abstract:
We present the photometric and spectroscopic analysis of four W-UMa
binaries J015829.5+260333 (hereinafter as J0158), J030505.1+293443
(hereinafter as J0305), J102211.7+310022 (hereinafter as J1022), and
KW-Psc. The VRcIc band photometric observations are carried out with
the 1.3m Devasthal Fast Optical Telescope (DFOT). For low-resolution
spectroscopy, we used the 2m Himalayan Chandra Telescope (HCT) as well
as the archival data from the 4m LAMOST survey. The systems J0158 and
J0305 show a period increase rate of 5.26(±1.72)x10-7days/yr and
1.78(±1.52)x10-6days/yr, respectively. The period of J1022 is
found to be decreasing with a rate of 4.22(±1.67)x10-6days/yr.
The period analysis of KW-Psc displays no change in its period. The
PHOEBE package is used for the light-curve modeling and basic
parameters are evaluated with the help of the GAIA parallax. The
asymmetry of light curves is explained with the assumption of cool
spots at specific positions on one of the components of the system. On
the basis of temperatures, mass ratios, fill-out factors, and periods,
the system J1022 is identified as a W-subtype system while the others
show some mixed properties. To probe the chromospheric activities in
these W-UMa binaries, their spectra are compared with the known
inactive stars' spectra. The comparison shows emission in Hα,
Hβ, and CaII. To understand the evolutionary status of these
systems, the components are plotted in mass-radius and mass-luminosity
planes with other well characterized binary systems. The secondary
components of all the systems are away from ZAMS, which indicates that
the secondary is more evolved than the primary component.
Description:
The photometric observations of these targets have been acquired from
the 1.3m Devasthal Fast Optical Telescope (DFOT), Nainital employing a
2kx2k CCD detector having a field of view of ∼18'x18'. As observations
were carried out on different nights having varying moon
illuminations, the exposure time varied across the frames. The total
number of frames collected for J0158, J0305, J1022, and KW-Psc were
around 140, 200, 85, and 130, respectively, in each band (VRc Ic).
The Large sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST)
is a 4m aperture telescope with a field of view (FoV) of 5x5°.
Such large FoV and a combination of 4000 fibers makes it a highly
efficient tool for spectroscopy. It covers a spectral range of 370nm
to ∼900nm with spectral resolution of 1nm to ∼0.25nm. The use of
different gratings and camera positions can give a resolution in the
range of 1000-5000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 4 Basic information about the sources taken from
different surveys
table5.dat 67 115 TOMs estimated for J0158, J0305, J1022 and KW Psc
using data from different surveys
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See also:
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Heden+, 2015)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
V/128 : Chromospherically Active Binaries. Third version (Eker+, 2008)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/A+A/311/523 : Photometry of W UMa (Maceroni+, 1996)
J/A+AS/142/275 : Stellar activity of late-type stars (Strassmeier+ 2000)
J/ApJS/152/251 : Indo-US library of coude feed stellar spectra (Valdes+, 2004)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/MNRAS/357/497 : Kinematics of W UMa-type binaries (Bilir+, 2005)
J/ApJS/193/1 : UBVRIJHK color-temperature calibration (Worthey+, 2011)
J/A+A/541/A41 : Basic tracks at Zinit=0.006 (Mowlavi+, 2012)
J/MNRAS/430/2029 : Initial masses of W UMa type contact binaries (Yildiz+,2013)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/ApJS/230/16 : 05 through L3 empirical stellar spectra SDSS (Kesseli+,2017)
J/ApJS/237/28 : WISE catalog of periodic variable stars (Chen+, 2018)
J/AJ/156/241 : First catalog variable stars measured ATLAS (Heinze+, 2018)
J/ApJS/247/50 : Late-type contact binaries in CSS DR1 (Sun+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Star Star observed
8- 9 I2 h RAh [1/22] Hour of right ascension (J2000)
11- 12 I2 min RAm Minute of right ascension (J2000)
14- 17 F4.1 s RAs Second of right ascension (J2000)
19 A1 --- DE- [+] Sign of declination (J2000)
20- 21 I2 deg DEd [5/31] Degree of declination (J2000)
23- 24 I2 arcmin DEm Arcminute of declination (J2000)
26- 27 I2 arcsec DEs Arcsecond of declination (J2000)
29- 36 F8.6 d Per [0.22/0.26] Period
38- 42 F5.2 mag Vmag [12.16/12.71] V-band magnitude
44- 48 F5.3 mag B-V [0.62/0.98] B-V color excess (1)
50- 54 F5.3 mag J-K [0.3/0.67] J-K color excess (1)
56- 60 F5.3 mas plx [1.44/7.06] Parallax (1)
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Note (1): The (B-V) is taken from the APASS survey, (J-K) is taken
from the 2MASS survey, and the parallax is from GAIA DR2.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Star Star ID
8- 17 F10.5 d HJD [3228/8799] Time of minimum light; HJD-2450000
19- 25 F7.5 d e_HJD [0/0.006] Error on HJD
27- 27 A1 --- eclipse [ps] primary or secondary eclipse
29- 36 F8.1 --- Cycle [-17365/19082] Cycle
38- 45 F8.5 d O-C1 [-0.06/0.08] Residual 1
47- 54 F8.5 d O-C2 [-0.02/0.01] Residual 2
56- 67 A12 --- Ref References (1)
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Note (1): References as follows:
1 = superWASP
2 = CSS; Drake+, 2014, Catalina Surveys periodic variable stars
3 = ASAS;Jayasinghe+, 2018, II/366
4 = Gokay+, 2010IBVS.5922....1G 2010IBVS.5922....1G
5 = Diethelm, 2010IBVS.5920....1D 2010IBVS.5920....1D
6 = Diethelm, 2011IBVS.5960....1D 2011IBVS.5960....1D
7 = Diethelm, 2012IBVS.6011....1D 2012IBVS.6011....1D
8 = Diethelm, 2013IBVS.6042....1D 2013IBVS.6042....1D
9 = present data.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 05-Aug-2021