J/A+A/572/A71 Times of minima for 18 SMC eclipsing binaries (Zasche, 2014)
Apsidal motion and light curve solution for eighteen SMC eccentric
eclipsing binaries.
Zasche P., Wolf M., Vrastil J., Liska J., Skarka M., Zejda M.
<Astron. Astrophys. 572, A71 (2014)>
=2014A&A...572A..71Z 2014A&A...572A..71Z
ADC_Keywords: Binaries, eclipsing
Keywords: stars: binaries: eclipsing - stars: early-type -
stars: fundamental parameters - Magellanic Clouds
Abstract:
The Danish 1.54-meter telescope at the La Silla observatory was used
for photometric monitoring of selected eccentric eclipsing binaries
located in the Small Magellanic Cloud. The new times of minima were
derived for these systems, which are needed for accurate determination
of the apsidal motion. Moreover, many new times of minima were derived
from the photometric databases OGLE and MACHO. Eighteen early-type
eccentric-orbit eclipsing binaries were studied.
Their O-C diagrams of minima timings were analysed and the
parameters of the apsidal motion were obtained. The light curves of
these eighteen binaries were analysed using the program PHOEBE, giving
the light curve parameters. For several systems, the additional third
light also was detected.
Description:
Monitoring of faint EEBs in external galaxies became almost routine
nowadays with quite moderate telescopes of 1-2m class, which are
equipped with a modern CCD camera. However, a large amount of
observing time is needed, which is usually unavailable at larger
telescopes. During the last two observational seasons, we have
accumulated 2660 photometric observations and derived 29 precise times
of minimum light for selected eccentric systems. New CCD photometry
was obtained at the La Silla Observatory in Chile, where the 1.54-m
Danish telescope with the CCD camera and R filter was used (remotely
from the Czech Republic).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 92 18 List of studied stars (data from Pawlak et al.,
2013AcA....63..323P 2013AcA....63..323P)
minima.dat 66 567 List of the minima timings used for the analysis
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See also:
J/AcA/48/563 : BVI photometry of OGLE SMC eclipsing binaries (Udalski+, 1998)
J/AcA/54/1 : OGLE II SMC eclipsing binaries (Wyrzykowski+, 2004)
J/A+A/439/559 : OGLE eclipsing binaries (bulge+lmc+smc) (Groenewegen+, 2005)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- --- [OGLE-SMC-ECL-]
14- 17 I04 --- Star Eclipsing binary ID (OGLE-SMC-ECL-NNNN)
19- 26 A8 --- Field OGLE-III field (SMCNNN.N)
29- 33 I5 --- OGLE OGLE-III database number
35- 36 A2 --- Type [ED] Variability type
39- 40 I2 h RAh Right ascension, equinox J2000.0 (hours)
42- 43 I2 min RAm Right ascension, equinox J2000.0 (minutes)
45- 49 F5.2 s RAs Right ascension, equinox J2000.0 (seconds)
51 A1 --- DE- Declination, equinox J2000.0 (sign)
52- 53 I2 deg DEd Declination, equinox J2000.0 (degrees)
55- 56 I2 arcmin DEm Declination, equinox J2000.0 (arc minutes)
58- 61 F4.1 arcsec DEs Declination, equinox J2000.0 (arc seconds)
63- 77 A15 --- OGLE-II OGLE-II ID (SMCSCNNNNNNNN)
79- 92 A14 --- MACHO MACHO ID (NNN.NNNNN.NNNN)
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Byte-by-byte Description of file: minima.dat
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Bytes Format Units Label Explanations
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2- 14 A13 --- --- [OGLE-SMC-ECL-]
15- 18 I04 --- Star Eclipsing binary ID (OGLE-SMC-ECL-NNNN)
22- 32 F11.5 d HJD Heliocentric Julian Date of Minimum (HJD-2400000)
36- 42 F7.5 d e_HJD Error of HJD
46- 49 A4 --- Type Type of Minimum ("Prim" or "Sec")
53- 56 A4 --- Filter [B+R I] Filter used
59- 66 A8 --- Ref Source/Observatory (1)
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Note (1): Source/Observatory code as follows:
MACHO = Faccioli et al., 2007AJ....134.1963F 2007AJ....134.1963F, Cat. J/AJ/134/1963
OGLE II = Wyrzykowski et al., 2004AcA....54....1W 2004AcA....54....1W, Cat. J/AcA/54/1
OGLE III = Graczyk et al., 2011AcA....61..103G 2011AcA....61..103G, Cat. J/AcA/61/103
DK154 = Danish 1.54-meter telescope, located on La Silla
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Acknowledgements:
Petr Zasche,
(End) Patricia Vannier [CDS] 03-Sep-2014