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J/AJ/114/326                                MACHO Variables V. (Alcock+ 1997)

The MACHO Project LMC Variable Star Inventory. V. Classification and Orbits of 611 Eclipsing Binary Stars Alcock C., Allsman R.A., Alves D., Axelrod T.S., Becker A.C., Bennett D.P., Cook K.H., Freeman K.C., Griest K., Lacy C.H.S., Lehner M.J., Marshall S.L., Minniti D., Peterson B.A., Pratt M.R., Quinn P.J., Rodgers A.W., Stubbs C.W., Sutherland W., , Welch D.L. <Astron. J. 114, 326 (1997)> =1997AJ....114..326A
ADC_Keywords: Binaries, eclipsing ; Binaries, orbits ; Photometry ; Magellanic Clouds Abstract: We report the characteristics of 611 eclipsing binary stars in the Large Magellanic Cloud found by using the MACHO Project photometry database. The sample is magnitude limited, and extends down the main sequence to about spectral type A0. Many evolved binaries are also included. Each eclipsing binary is classified according to the traditional scheme of the General Catalogue of Variable Stars (EA and EB), and also according to a new decimal classification scheme defined in this paper. The new scheme is sensitive to the two major sources of variance in eclipsing binary star light curves -- the sum of radii, and the surface-brightness ratio, and allow greater precision in characterizing the light curves. Examples of each type of light curve and their variations are given. Sixty-four of the eclipsing binaries have eccentric, rather than circular, orbits. The ephemeris and principal photometric characteristics of each eclipsing binary are listed in a table. Photometric orbits based on the Nelson-Davis-Etzel model have been fitted to all light curves. These data will be useful for planning future observations of these binaries. Plots of all data and fitted orbits and a table of the fitted orbital parameters are available on the AAS CD-ROM series, Vol. 9, 1997. These data are also available at the MACHO home page ( (c) 1997 American Astronomical Society. Description: As submitted by the author, 637 PostScript figures containing light curves for the LMC eclipsing binary stars in the V and R bands are contained in a single UNIX tape archive (tar) file. The individual files have names of the form '', which do not conform to the CD-ROM ISO 9660 Standard Interchange Level 1, therefore they have been left in the original tar format. The PostScript figures are available on the CD-ROM. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 140 637 Properties of eclipsing binaries in the LMC table4.dat 112 1274 Photometric Orbital Parameters
See also: MACHO home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000.0) 3 A1 --- --- Always ':' 4- 5 I2 min RAm Right ascension (J2000.0) 6 A1 --- --- Always ':' 7- 10 F4.1 s RAs Right ascension (J2000.0) 13 A1 --- DE- Declination sign 14- 15 I2 deg DEd Declination (J2000.0) 16 A1 --- --- Always ':' 17- 18 I2 arcmin DEm Declination (J2000.0) 19 A1 --- --- Always ':' 20- 21 I2 arcsec DEs Declination (J2000.0) 22 A1 --- Comp [abc] Indicator of multiple observations 24- 28 A5 --- Type *Classification types 31- 35 F5.2 mag VMax V magnitude at maximum brightness 37- 41 F5.2 mag VMinI V magnitude at first minimum 43- 47 F5.2 mag VMinII V magnitude at second minimum 50- 54 F5.2 mag V-R V-R color 56- 67 F12.4 JD Epoch Epoch of the primary minimum 69- 74 F6.4 JD e_Epoch Standard error of the Epoch 76- 85 F10.6 d Per Orbital period 88- 92 F5.3 --- DI [0/1] Primary eclipse duration (phase units) 95- 97 I3 --- o_Vfilt Number of observations in V filter 100-104 F5.3 mag SDv Std deviation of residuals from fits (V) 107-109 I3 --- o_Rfilt Number of observations in R filter 112-116 F5.3 mag SDr Std deviation of residuals from fits (R) 119-140 A22 --- Notes *Notes
Note on Type: The type is in the form: XX/NN, where XX is either EA or EB from the General Catalog of Variable Stars and NN is an integer from 1 to 10, inclusive. The numeric classifications are based on the two major sources of variance in the shapes of the eclipsing binary light curves, (1) the sum of the relative radii (r1 + r2), and (2) the surface brightness ratio Js/Jp. Classes 1, 2, and 3 have a surface brightness ratio near unity; classes 4, 5, and 6 have a surface brightness ratio near 0.5; classes 7, 8, and 9 have a surface brightness ratio near 0.18. Classes 1, 4, and 7 have a sum of radii near 0.4; classes 2, 5, and 8 have a sum of radii near 0.7; classes 3, 6, and 9 have a sum of radii near unity. Class 10 is reserved for "Algol-like" systems in which the effects of a secondary component larger than the primary and a large mass ratio are evident in the light curve from the broad and deep "wings" on the eclipses. Note on Notes: An asterisk, "*", indicates that there are multiple sets of observations of this star. The line of data above or below the asterisk refers to independent observations of the same star. Other notes are entered in full.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000.0) 3 A1 --- --- Always ':' 4- 5 I2 min RAm Right ascension (J2000.0) 6 A1 --- --- Always ':' 7- 10 F4.1 s RAs Right ascension (J2000.0) 12 A1 --- DE- Declination sign 13- 14 I2 deg DEd Declination (J2000.0) 15 A1 --- --- Always ':' 16- 17 I2 arcmin DEm Declination (J2000.0) 18 A1 --- --- Always ':' 19- 20 I2 arcsec DEs Declination (J2000.0) 21 A1 --- Comp [abc] Indicator of multiple observations 23 A1 --- Color [VR] Color band for the following data 25- 29 F5.3 --- Js Surface brightness of the secondary (Jp=1) 31- 35 F5.3 --- e_Js Error in Js 37- 41 F5.3 solRad rp Radius of the primary 43- 47 F5.3 solRad e_rp Error in rp 49- 52 F4.2 --- k Ratio of the radii 54- 57 F4.2 --- x Limb-darkening coefficient 59- 62 F4.1 deg i Orbital inclination 64- 67 F4.1 deg e_i Error in i 69- 75 F7.4 --- ecosw ?=0.0000 e*cosω component of eccentricity 77- 82 F6.4 --- e_ecosw ?=0.0000 Error in ecosw 84- 90 F7.4 --- esinw ?=0.0000 e*sinω component of eccentricity 92- 97 F6.4 --- e_esinw ?=0.0000 Error in esinw 99-102 F4.2 --- q Assumed mass ratio 104-106 I3 --- N Number of observations 108-112 F5.3 --- SD Standard deviation of the residuals of the fit
Origin: AAS CD-ROM series, Volume 9, 1997 Lee Brotzman [ADS] 05-Nov-1997 References: Alcock et al., Paper I. 1995AJ....109.1653A Alcock et al., Paper II. 1996AJ....111.1146A Alcock et al., Paper III. 1997ApJ...482...89A Alcock et al., Paper IV. 1996ApJ...470..583A
(End) [CDS] 05-Feb-1998
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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