Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/363/529   uvby, UBV and radial velocity of WW Aur    (Southworth+, 2005)

Absolute dimensions of detached eclipsing binaries - I. The metallic-lined system WW Aurigae. Southworth J., Smalley B., Maxted P.F.L., Claret A., Etzel P.B. <Mon. Not. R. Astron. Soc., 363, 529-542 (2005)> =2005MNRAS.363..529S
ADC_Keywords: Binaries, eclipsing ; Photometry, uvby ; Photometry, UBV ; Radial velocities Keywords: stars: binaries: eclipsing - stars: fundamental parameters - stars: binaries: spectroscopic - stars: early-type - stars: chemically peculiar Abstract: WW Aurigae is a detached eclipsing binary composed of two metallic- lined A-type stars orbiting each other every 2.5 days. We have determined the masses and radii of both components to accuracies of 0.4% and 0.6%, respectively. From a cross-correlation analysis of high-resolution spectra we find masses of 1.964±0.007M for the primary star and 1.814±0.007M for the secondary star. From an analysis of photoelectric uvby and UBV light curves we find the radii of the stars to be 1.927±0.011R and 1.841±0.011R, where the uncertainties have been calculated using a Monte Carlo algorithm. Fundamental effective temperatures of the two stars have been derived, using the Hipparcos parallax of WW Aur and published ultraviolet, optical and infrared fluxes, and are 7960±420 and 7670±410K. The masses, radii and effective temperatures of WW Aur are only matched by theoretical evolutionary models for a fractional initial metal abundance, Z, of approximately 0.06 and an age of roughly 90Myr. This seems to be the highest metal abundance inferred for a well-studied detached eclipsing binary, but we find no evidence that it is related to the metallic-lined nature of the stars. The circular orbit of WW Aur is in conflict with the circularization timescales of both the Tassoul and the Zahn tidal theories and we suggest that this is due to pre-main-sequence evolution or the presence of a circular orbit when the stars were formed. Description: Observational data and results are presented for the A-type detached eclipsing binary star system WW Aurigae. The known times of minimum light of the system are given. Stromgren uvby photoelectric light curves, with about 950 measurements in each passband, are given. These are originally from Etzel (1975, Masters Thesis, San Diego State University, unpublished). Johnson UBV photoelectric light curves, with about 1000 measurements in each passband, are given. These were obtained from Kiyokawa & Kitamura (1975AnTok..15..117K) using optical character recognition software and were included here for convenience. We also give the radial velocities of the two stars measured using TODCOR (Zucker & Mazeh, 1994ApJ...420..806Z) with template spectra of HD 39945 (for the primary component of WW Aur) and HD 32115 (for the secondary component). Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 06 32 27.2 32 27 17 WW Aur = HR 2372 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file minima.dat 12 69 Times of minimum light from the literature ustro.dat 25 981 Stroemgren u differential photoelectric photometry (from Etzel, 1975, Masters Thesis) bstro.dat 25 902 Stroemgren b differential photoelectric photometry (from Etzel, 1975, Masters Thesis) ystro.dat 25 903 Stroemgren y differential photoelectric photometry (from Etzel, 1975, Masters Thesis) vstro.dat 25 962 Stroemgren v differential photoelectric photometry (from Etzel, 1975, Masters Thesis) ujohn.dat 25 999 Johnson U differential photoelectric photometry (Kiyokawa & Kitamura, 1975AnTok..15..117K) bjohn.dat 25 980 Johnson B differential photoelectric photometry (Kiyokawa & Kitamura, 1975AnTok..15..117K) vjohn.dat 25 1058 Johnson V differential photoelectric photometry (Kiyokawa & Kitamura, 1975AnTok..15..117K) rv.dat 26 58 Radial velocities of both components of WW Aur (Kiyokawa & Kitamura, 1975AnTok..15..117K)
Byte-by-byte Description of file: minima.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian Date times of minimum light
Byte-by-byte Description of file: [uvby]stro.dat [ubv]john.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJD HJD of observation 15 A1 --- Band [uvbyUBV] Photometric band 17- 25 F9.5 mag dmag Observed differential magnitude
Byte-by-byte Description of file: rv.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD HJD of observation 13- 19 F7.1 km/s RV(A) Measured radial velocity of primary star 20- 26 F7.1 km/s RV(B) Measured radial velocity of secondary star
Acknowledgements: John Southworth, jkt(at)astro.keele.ac.uk
(End) John Southworth [Keele, U.K], Patricia Vannier [CDS] 20-Oct-2005
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

catalogue service

© UDS/CNRS

Contact