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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
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), 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).
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 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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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