J/AJ/135/1757 GX Gem radial velocities and light curves (Sandberg+, 2008)
Absolute properties of the main-sequence eclipsing binary star GX Geminorum:
constraints on convective core overshooting.
Sandberg Lacy C.H., Torres G., Claret A.
<Astron. J., 135, 1757-1765 (2008)>
=2008AJ....135.1757S 2008AJ....135.1757S
ADC_Keywords: Binaries, eclipsing ; Stars, dwarfs ; Radial velocities ;
Photometry
Keywords: binaries: eclipsing - binaries: spectroscopic - stars: evolution -
stars: fundamental parameters - stars: individual (GX Geminorum)
Abstract:
We present 12,155 new differential photometric observations in the V
filter made with the Undergraduate Research Studies in Astronomy and
NF\Observatory WebScopes, as well as 33 radial velocities from
spectroscopic observations of the detached, 4.04 day double-lined
eclipsing binary star GX Gem. Absolute dimensions of the components
are determined from these new, and also from previously published,
data with high precision (less than 0.7% in the masses and radii) for
the purpose of testing various aspects of theoretical modeling. We
obtain 1.488±0.011 solar masses and 2.327±0.012 solar radii for
the primary, and 1.467±0.010 solar masses and 2.238±0.012 solar
radii for the secondary. The effective temperatures and interstellar
reddening of the stars are accurately determined from the spectra,
uvbyβ, and UBV photometry: 6195±100K for the primary,
6165±100K for the secondary, corresponding to spectral types of F7
and F7 V, and 0.068mag for the color excess E(b-y). Spectral line
widths give rotational velocities that are synchronous with the mean
orbital motion in a circular orbit.
Description:
GX Gem was observed spectroscopically by Lacy at KPNO from 1989 May 10
to 1990 May 7. Grating A in second order and TI 800x800 CCDs were
used with the coude feed telescope and the coude spectrometer. The
resolution (2 pixels) was typically 0.025nm with 10nm of coverage
centered near a wavelength of 643nm. The signal-to-noise ratio (S/N)
was typically 10, which is poor, due to the faintness of the star.
Objects:
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RA (2000) DE Designation(s)
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06 46 09.1 +34 24 53 GX Gem = HD 263139
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 43 33 CfA radial velocities of GX Gem
table3.dat 27 6631 Differential V magnitudes of GX Gem from URSA images
table4.dat 27 5545 Differential V magnitudes of GX Gem from NFO images
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
14- 19 F6.2 km/s RVA Radial velocity of A component
21- 26 F6.2 km/s RVB Radial velocity of B component
28- 31 F4.2 km/s sigmaA Velocity dispersion of A component
33- 36 F4.2 km/s sigmaB Velocity dispersion of B component
38- 43 F6.4 --- Phase Phase (1)
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Note (1): This eclipse ephemeris was used:
Min I (HJD) = 2450824.55685+4.03793641xE
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 7 F7.5 --- Phase Orbital Phase
9- 13 F5.3 mag dVmag Differential V band magnitude
15- 27 F13.5 d HJD Heliocentric Julian Date
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Nov-2010