J/A+A/525/A2 Eclipsing binaries in NGC6791 (Brogaard+, 2011)
Age and helium content of the open cluster NGC6791 from multiple eclipsing
binary members.
I. Measurements, methods, and first results.
Brogaard K., Bruntt H., Grundahl F., Clausen J.V., Frandsen S.,
VandenBerg D.A., Bedin L.R.
<Astron. Astrophys. 525, A2 (2011)>
=2011A&A...525A...2B 2011A&A...525A...2B
ADC_Keywords: Clusters, open ; Binaries, eclipsing ; Photometry ;
Radial velocities ; Spectroscopy
Keywords: open clusters: individual NGC 6791 - stars: evolution -
binaries: spectroscopic - binaries: eclipsing -
techniques: spectroscopic - techniques: photometric
Abstract:
We present photometric and spectroscopic observations of eclipsing
binaries and single stars, which are members of the open cluster
NGC6791. These were used to measure precise and accurate masses, radii
and metallicity of the stars along with reddening and distance modulus
to the cluster.
Description:
photom.dat file contains light curves of the eclipsing binaries V18
and V80 in V and Rc bands observed with the ALFOSC instrument at the
Nordic Optical Telescope.
rv.dat file contains radial velocity measurements of V18, V20 and V80.
Tables 18-22 contain normalised separated one-dimensional spectra of some
of the binary components and a composite spectrum of two single stars.
The spectra were observed with the UVES spectrograph at the Very Large
Telescope at a resolution of ∼37000.
Objects:
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RA (2000) DE Designation(s)
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19 20 49.38 +37 46 09.3 V18 = V565 Lyr = Cl* NGC 6791 KR V18
19 20 54.30 +37 45 34.7 V20 = V568 Lyr = Cl* NGC 6791 KR V20
19 21 06.48 +37 47 27.8 V80 = V633 Lyr = Cl* NGC 6791 KR V80
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 55 3 List of stars with period
photom.dat 30 2140 V- and Rc band light curve of V18 and V80
rv.dat 58 38 Radial velocity measurements of V18, V20 and V80
table18.dat 24 83930 Spectrum of the primary component of V18
table19.dat 24 82967 Spectrum of the secondary component of V18
table20.dat 24 62474 Spectrum of the primary component of V20
table21.dat 24 58705 Spectrum of the primary component of V80
table22.dat 24 77388 Composite spectrum of two close single stars
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Star Star name
5- 12 A8 --- SName Simbad name
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 24 F5.2 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 36 F4.1 arcsec DEs Declination (J2000)
38- 46 F9.6 d Per Period
48- 55 F8.6 d e_Per rms uncertainty on Per
58- 59 I2 --- Sp1 Table number with spectrum of primary
61- 62 I2 --- Sp2 ? Table number with spectrum of secondary
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Star Star name
5- 6 A2 --- Band [V Rc] Observed band
8- 21 F14.6 d HJD Heliocentric Julian Date
24- 30 F7.4 --- mag V or Rc-band magnitude
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Star Star name
5- 17 F13.5 d HJD Heliocentric Julian Date
19- 25 F7.5 --- phase Orbital phase of measurement (1)
28- 34 F7.2 km/s RVp Radial velocity of primary component
36- 42 F7.2 km/s RVs Radial velocity of secondary component
46- 50 F5.2 km/s (O-C)p Observed minus calculated RV of primary (1)
54- 58 F5.2 km/s (O-C)s Observed minus calculated RV of secondary (1)
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Note (1): Orbital phase and (O-C) values are from double-lined orbital solutions
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Byte-by-byte Description of file: table1[89].dat table2[012].dat
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Bytes Format Units Label Explanations
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3- 12 F10.5 0.1nm lambda Wavelength in Angstrom
17- 24 F8.6 --- Flux Normalised flux of primary or secondary
component
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Acknowledgements:
Karsten Brogaard, kfb(at)phys.au.dk
(End) Karsten Brogaard [Aarhus University], Patricia Vannier [CDS] 06-Oct-2010