J/ApJ/839/39 Long-term CCD photometry of the EB 2M1533+3759 (Lee+, 2017)
Long-term CCD photometry and physical properties of the sdB+M eclipsing system
2M 1533+3759.
Lee J.W., Youn J.-H., Hong K., Han W.
<Astrophys. J., 839, 39 (2017)>
=2017ApJ...839...39L 2017ApJ...839...39L
ADC_Keywords: Binaries, eclipsing ; Photometry, VRI
Keywords: binaries: close; binaries: eclipsing; stars: fundamental parameters;
stars: individual (2M 1533+3759); subdwarfs
Abstract:
New CCD photometry of seven successive years from 2010 is presented
for the HW Vir-type eclipsing binary 2M 1533+3759. Using the VI light
curves together with the radial-velocity data given by For+
(2010ApJ...708..253F 2010ApJ...708..253F), we determined the absolute parameters of each
component to be M1=0.442±0.012M☉, M2=0.124±0.005M☉,
R1=0.172±0.002R☉, R2=0.157±0.002R☉, L1=19.4±1.4L☉,
and L2=0.002±0.002L☉. These indicate that 2M 1533+3759 is a
detached system consisting of a normal sdB primary and an M7 dwarf
companion. Detailed analyses of 377 minimum epochs, including our 111
timings, showed that the orbital period of the system remains constant
during the past 12 years. Inspecting both types of minima, we found a
delay of 3.9±1.0s in the arrival times of the secondary eclipses
relative to the primary eclipse times. This delay is in satisfactory
agreement with the predicted Romer delay of 2.7±1.4s, and the result
is the second measurement in sdB+M eclipsing binaries. The time shift
of the secondary eclipse can be explained by some combination of the
Romer delay and a non-zero eccentricity. Then the binary star would
have a very small eccentricity of e.cosω∼0.0001.
Description:
We took CCD photometric observations of 2MASS J15334944+3759282 for 76
nights from 2010 May through 2016 May, using the 1.0-m reflector at
Mt. Lemmon Optical Astronomy Observatory (LOAO) in Arizona.
Objects:
-------------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
-------------------------------------------------------------------------
15 33 49.44 +37 59 28.3 2M 1533+3759 = NSVS 7826147 (P=0.16177045)
-------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 23 12696 CCD photometric observations of 2M 1533+3759
table5.dat 23 100 *New times of minimum light for 2M 1533+3759
--------------------------------------------------------------------------------
Note on table5.dat: From all our CCD observations, we determined 111 eclipse
times and their errors using the method of
Kwee & van Woerden (1956BAN....12..327K 1956BAN....12..327K).
--------------------------------------------------------------------------------
See also:
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)
J/AJ/138/478 : AR Boo differential BVR photometry (Lee+, 2009)
J/ApJ/753/101 : Kepler eclipse timings of KIC 9472174 (Barlow+, 2012)
J/AJ/143/95 : Transit light curves of HAT-P-12 (Lee+, 2012)
J/A+A/566/A128 : Period variations in SuperWASP PCEB (Lohr+, 2014)
J/A+A/576/A44 : Hot subdwarf binaries from MUCHFUSS (Kupfer+, 2015)
J/ApJ/835/189 : KIC 11401845 eclipse timings (Lee+, 2017)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 1 A1 --- Filt Filter used (I or V)
3- 15 F13.5 d BJD Barycentric Julian Date
17- 23 F7.4 mag Delmag [-0.04/1.7] Differential magnitude from the
artificial reference star in Filt
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.5 d BJD Barycentric Julian Date; BJD-2450000
12- 18 F7.5 d e_BJD BJD error
20 A1 --- Filt Filter used (I or V)
22- 23 A2 --- Min ("I" = Primary or "II" = Secondary)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Nov-2017