J/AJ/156/220 V, R and I light curves of 4 new low-mass M-type EBs (Long+, 2018)
Photometric and spectroscopic studies of four new low-mass M-type eclipsing
binaries.
Long L., Zhang L.-Y., Han X.L., Lu H.-P., Pi Q.-F., Yue Q.
<Astron. J., 156, 220 (2018)>
=2018AJ....156..220L 2018AJ....156..220L
ADC_Keywords: Binaries, eclipsing ; Stars, M-type ; Photometry, VRI
Keywords: binaries: eclipsing - starspots -
stars: individual (HAT 225-03429, individual CRTS J085623.0+282620,
CRTS J110302.4+201611, 2MASS J163)
Abstract:
We performed multicolor photometric and spectroscopic observations
of four new low-mass M-type eclipsing binaries (HAT 225-03429,
CRTS J085623.0+282620, CRTS J110302.4+201611, 2MASS J16344899+3716423)
in 2017. We obtained new VRI light curves and minimum times of these four
systems. Based on our minimum times, we updated the orbital periods and
the linear ephemerides using the least squares method. We analyzed these
four systems using the Wilson-Devinney program, and obtained the orbital
and starspot parameters. The results of our analysis of the light curves
indicate that HAT 225-03429 and CRTS J085623.0+282620 are detached
eclipsing binaries, CRTS J110302.4+201611 is a semi-detached eclipsing
binary, and 2MASS J16344899+3716423 is a contact binary. We performed
LAMOST spectroscopic studies of chromospheric activity indicators
(Hα, Hβ, Hγ, Hδ, and Ca II H&K lines) for these four
systems for the first time. We first determined their spectral types and
calculated the equivalent widths of their chromospheric active indicators.
These indicators show that the four low-mass M-type eclipsing binaries
are active. Furthermore, the radii of these stars are notably larger than
model predictions for their masses, except for the secondary component
of HAT 225-03429 and the primary component of CRTS J110302.4+201611.
Description:
In this work, we observed three of the four low-mass eclipsing binaries
in 2017 (HAT 225-03429: 2017 February 26, 28, and March 2;
CRTS J085623.0+282620: 2017 February 27, and March 1;
CRTS J110302.4+201611: 2017 March 2.) using the 85 cm reflecting telescope
at the Xinglong station of the National Astronomical Observatories of
China (NAOC), which is equipped with a 1024x1024 pixel CCD (Zhou et al.
2009RAA.....9..349Z 2009RAA.....9..349Z). We used the VRI, RI, and VRI filters for
HAT 225-03429, CRTS J085623.0+282620 and, CRTS J110302.4+201611. We
observed 2MASS J16344899+3716423 using the SARA 91.4 cm telescope at the
Kitt Peak National Observatory (SARA KP) in Arizona on 2017 May 24 and
June 11, and the Holcomb telescope in Indiana on 2017 May 17 and 22.
The Holcomb telescope is a 94 cm Cassegrain Reflecting telescope with
a focal ratio of f/6.1. It is equipped with a 2048x2064 CCD. The CCD
camera of the SARA KP telescope has a resolution of 2048x2048 pixels,
but we used it in 2x2 binning mode, leading to an effective resolution
of 1024x1024. We used Bessel VRI and RI filters for the Holcomb telescope
and the SARA KP telescope (Keel et al. 2017PASP..129a5002K 2017PASP..129a5002K), respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 4 Basic properties for four low-mass M-type
eclipsing binaries
table3.dat 81 1115 Observational data of the four low-mass M-type
eclipsing binaries obtained in 2017
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See also:
J/ApJ/684/635 : New low-mass eclipsing binary from SDSS-II (Blake+, 2008)
J/AJ/141/78 : Low-mass eclipsing binaries in KIC (Coughlin+, 2011)
J/MNRAS/426/1507 : Detached M dwarf eclipsing binaries in WTS (Birkby+, 2012)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/MNRAS/442/2620 : VRI light curve of 5 eclipsing binaries (Zhang+, 2014)
J/MNRAS/469/3688 : CSS Periodic Variable Star Catalogue (Drake+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Star Star name
25- 44 A20 --- CSS Catalina Sky Survey identifier
(CSS_JHHMMSS.s+DDMMSS)
46- 47 I2 h RAh Hour of Right Ascension (J2000)
49- 50 I2 min RAm Minute of Right Ascension (J2000)
52- 56 F5.2 s RAs Second of Right Ascension (J2000)
58 A1 --- DE- Sign of the Declination (J2000)
59- 60 I2 deg DEd Degree of Declination (J2000)
62- 63 I2 arcmin DEm Arcminute of Declination (J2000)
65- 68 F4.1 arcsec DEs Arcsecond of Declination (J2000)
70- 74 F5.2 mag Vmagavg [14.06/14.72] Average V band magnitude from
Adaptive Fourier Decomposition (AFD)
76- 83 F8.6 d Per [0.246723/0.42647] Period (fundamental PF)
85- 88 F4.2 mag Vamp [0.1/0.24] Amplitude from AFD
90-110 A21 --- Type Type of periodic variable
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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- 23 A23 --- Star Star name
25- 36 F12.4 d HDJ-V ? Heliocentric Julian Date of V band observation
38- 42 F5.3 mag DVmag [1.576/3.573]? Differential V band magnitude
44- 55 F12.4 d HDJ-R ? Heliocentric Julian Date of R band observation
57- 61 F5.3 mag DRmag [0.897/3.051]? Differential R band magnitude
63- 74 F12.4 d HDJ-I ? Heliocentric Julian Date of I band observation
76- 81 F6.3 mag DImag [-0.172/2.441]? Differential I band magnitude
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Apr-2019