J/ApJ/954/111 The light minimum times of NY Boo from TESS (Meng+, 2023)
NY Bootes: an active deep and low-mass-ratio contact binary with a cool
companion in a hierarchical triple system.
Meng F., Zhu L., Qian S., Liu N., Li L., Matekov A.
<Astrophys. J., 954, 111 (2023)>
=2023ApJ...954..111M 2023ApJ...954..111M
ADC_Keywords: Binaries, eclipsing; Photometry; Optical
Keywords: Close binary stars ; Binary stars ; Eclipsing binary stars
Abstract:
The first detailed photometric and spectroscopic study of G-type
short-period binary NY Boo is presented. The radial velocity curve was
obtained by the cross-correlation function (CCF) method based on
LAMOST and SDSS spectra, which derived its mass ratio as
q=0.139(1/7.2). The CCF profiles of the SDSS spectra clearly show the
existence of a cool third component, which is supported by the results
of the orbital period investigation. The period study based on the O-C
analysis indicates that besides a long-term decrease, the orbital
period has a periodic oscillation due to the light-travel time effect
caused by a third body. When the third light contribution is
consistent with the CCF results, the orbit of the third body and the
inner pair are non-coplanar with m3=0.31M☉. Combining with the
TESS light curves, it is found that the target is a deep and
low-mass-ratio contact binary (DLMRCB) with a fill-out factor of
f=73%. The notable asymmetry in light curves was detected and
explained by the spot model very well. The spectroscopic profiles, the
cyclic variation in the O-C diagram, and the radial velocity curve and
light-curve solutions all suggest that NY Boo is a hierarchical triple
system with a cool tertiary component orbiting around an active
DLMRCB. With the orbital period shrinking, the binary may eventually
merge. The period of NY Boo decreases faster than other shrinking
DLMRCB, together with active inner pair and non-coplanar tertiary
component, making NY Boo an important target for studying the late
evolution of binaries.
Description:
The Transiting Exoplanet Survey Satellite (TESS) provided photometric
data for NY Boo for five sectors (sector16 --2019-Sep-12 to Oct-06--,
sector23 --2020-Mar-19 to 2020-Apr-15--, sector24 --2020-Apr-16 to
May-12--, sector49 --2022-Feb-26 to Mar-25, and sector50 --2022-Mar-26
to Apr-22) with an exposure time of 2 minutes. We adopted the simple
aperture photometry light curves downloaded from the Mikulski Archive
for Space Telescopes (MAST database).
Six low-resolution spectra of NY Boo are available from the LAMOST DR9
database. The resolution of LAMOST low-resolution spectra is R∼1800
with a wavelength coverage of 3700-9100Å.
Except for LAMOST, the target was also observed by SDSS. SDSS is a
large-sky survey project that provides a large amount of imaging and
spectral data. Three infrared spectra were downloaded from the SDSS
Scientific Archive Server. The wavelength range of infrared spectra
is 15141-16953Å with a resolution of R∼22500.
Objects:
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RA (ICRS) DE Designation(s)
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15 01 09.58 +48 48 15.9 NY Boo = Gaia DR3 1592064185294453376
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 45 803 The light minimum times of NY Boo
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)
J/AJ/130/767 : RVel studies of close binary stars (Rucinski+, 2005)
J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)
J/A+A/450/681 : Companions to close spectroscopic bin. (Tokovinin+, 2006)
J/AJ/133/1977 : Radial velocities of 10 close binaries (Pribulla+, 2007)
J/AJ/134/2353 : Observations of contact binaries (Rucinski+, 2007)
J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/AJ/137/3646 : Radial velocities of 10 close binaries (Pribulla+, 2009)
J/AJ/137/3655 : Radial velocities of 8 close binaries (Pribulla+, 2009)
J/MNRAS/405/1930 : Period changes of EA-, EB- and EW-types bin. (Liao+, 2010)
J/AJ/142/99 : BVRI observations of TZ Boo (Christopoulou+, 2011)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/AJ/145/39 : Differential BV(RI)c light curves of PY Vir (Zhu+, 2013)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/MNRAS/448/429 : Starspots in short-period Kepler binaries (Balaji+, 2015)
J/AJ/157/207 : BVRI_ light curve observations for VZ Lib (Liao+, 2019)
J/other/RAA/20.163 : Contact binaries in LAMOST DR7 (Qian+, 2020)
J/ApJ/922/122 : BVRcIc LCs of two contact binaries (Li+, 2021)
J/AJ/162/13 : Parameters for 173 eclipsing binaries (Li+, 2021)
J/AJ/161/46 : (O-C) curve of the binary system KIC 06852488 (Shi+, 2021)
J/AJ/164/202 : Extremely Low Mass Ratio Contact Binaries I. (Li+, 2022)
http://heasarc.gsfc.nasa.gov/docs/tess/ : TESS Science Support Center
http://www.lamost.org/dr9/v1.0/ : LAMOST DR9 home page
http://dr17.sdss.org/infrared/spectrum/search : SDSS DR17 SAS search
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date of eclipse minimum
15- 21 F7.5 d e_BJD [7e-05/0.006]? Uncertainty in BJD
23- 30 F8.1 --- E [-22435/2915] Epoch number
32- 42 F11.8 d O-C [-0.36/0.0033] The O-C value (1)
44- 45 I2 --- Ref [1/14] Reference code (2)
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Note (1): The O-C value was calculated according to the following linear
ephemeris formula:
Min.I(BJD)=2458738.85916+0d.3268051913xE (Equation 1)
See Section 3.
Note (2): Reference as follows:
1 = Khruslov (2006PZP.....6...16K 2006PZP.....6...16K)
2 = SuperWASP (see Butters+ 2010A&A...520L..10B 2010A&A...520L..10B)
3 = Diethelm (2012IBVS.6029....1D 2012IBVS.6029....1D)
4 = Hubscher & Lehmann (2013IBVS.6070....1H 2013IBVS.6070....1H)
5 = Honkova et al. (2015OEJV..168....1H 2015OEJV..168....1H)
6 = Hubscher & Lehmann (2015IBVS.6149....1H 2015IBVS.6149....1H)
7 = Jurysek et al. (2017OEJV..179....1J 2017OEJV..179....1J)
8 = ASAS-SN (see Shappee+ 2014, J/ApJ/788/48)
9 = Lehky et al. (2021OEJV..211....1L 2021OEJV..211....1L)
10 = Pagel (2018IBVS.6244....1P 2018IBVS.6244....1P)
11 = ZTF (Graham+ 2019PASP..131g8001G 2019PASP..131g8001G)
12 = TESS;
13 = BRNO database (http://var.astro.cz/fr)
14 = AAVSO database (http://www.aavso.org/databases)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Oct-2025