CDROM/AJ/V114/P0326 MACHO Variables V. (Alcock+ 1997) ================================================================================ The MACHO Project LMC Variable Star Inventory. V. Classification and Orbits of 611 Eclipsing Binary Stars C. Alcock, R. A. Allsman, D. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, K. C. Freeman, K. Griest, C. H. S. Lacy, M. J. Lehner, S. L. Marshall, D. Minniti, B. A. Peterson, M. R. Pratt, P. J. Quinn, A. W. Rodgers, C. W. Stubbs, W. Sutherland, and D. L. Welch (The MACHO Collaboration) <1997, AJ, 114, 326> =1997AJ....114..326A ================================================================================ 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 (http://wwwmacho.mcmaster.ca/). (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 'machohh:mm:ss.s-dd:mm:ss.ps', which do not conform to the CD-ROM ISO 9660 Standard Interchange Level 1, therefore they have been left in the original tar format. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1.dat 140 637 SQIID Photometry of MonR2 table4.dat 130 1274 IRCAM3 Photometry of MonR2 macho.tar 1 66445312 Unix tar file containing MACHO PS figures -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right ascension (J2000.0) 3 1X --- --- Always ':' 4- 5 I2 min RAm R.A. 6 1X --- --- Always ':' 7-10 F4.1 s RAs R.A. 11-12 2X --- --- Blank 13 A1 --- DE- Declination sign 14-15 I2 deg DEd Declination (1950) 16 1X --- --- Always ':' 17-18 I2 arcmin DEm Dec. 19 1X --- --- Always ':' 20-21 I2 arcsec DEs Dec. 22 A1 --- Comp [abc] Indicator of multiple observations 23 1X --- --- Blank 24-28 A5 --- Type *Classification types 29-35 F7.2 mag Max V magnitude at maximum brightness 36-41 F6.2 mag MinI V magnitude at first minumum 42-47 F6.2 mag MinII V magnitude at second minumum 48-54 F7.2 mag V-R V-R color 55-66 D12.4 JD Epoch Epoch of the primary minimum 67-73 F7.4 JD e_Epoch Standard error of the Epoch 74-85 D12.6 day P Orbital period 86-92 F7.3 --- DI Primary eclipse duration (phase units) 93-97 I5 --- Nv Number of observations in V filter 98-104 F7.3 --- SDv Std deviation of residuals from fits (V) 105-109 I5 --- Nr Number of observations in R filter 110-116 F7.3 --- SDr Std deviation of residuals from fits (R) 117-118 2X --- --- Blank 119-140 A22 --- Notes *Notes -------------------------------------------------------------------------------- Notes for file: table1.dat -------------------------------------------------------------------------------- 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. 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 1X --- --- Always ':' 4- 5 I2 min RAm R.A. 6 1X --- --- Always ':' 7-10 F4.1 s RAs R.A. 11-12 2X --- --- Blank 13 A1 --- DE- Declination sign 14-15 I2 deg DEd Declination (1950) 16 1X --- --- Always ':' 17-18 I2 arcmin DEm Dec. 19 1X --- --- Always ':' 20-21 I2 arcsec DEs Dec. 22 A1 --- Comp [abc] Indicator of multiple observations 23 1X --- --- Blank 24 A1 --- Color [VR] Color band for the following data 25-31 F7.2 --- Js Secondary surface brightness 32-38 F7.2 --- e_Js Error in Js 39-45 F7.2 --- rp Radius of the primary 46-52 F7.2 --- e_rp Error in rp 53-58 F6.2 --- k Ratio of the radii 59-64 F6.2 --- x Limb-darkening coefficient 65-70 F6.2 deg i Orbital inclination 71-76 F6.1 deg e_i Error in i 77-85 F9.4 --- ecosw []?=0.0000 e cos omega component of eccentricity 86-94 F9.4 --- e_ecosw []?=0.0000 Error in ecosw 95-103 F9.4 --- esinw []?=0.0000 e sin omega component of eccentricity 104-112 F9.4 --- e_esinw []?=0.0000 Error in esinw 113-118 F6.2 --- q Assumed mass ratio 119-123 I5 --- N Number of observations 124-130 F7.3 --- SD Standard deviation of the residuals of the fit -------------------------------------------------------------------------------- Notes for file: table4.dat -------------------------------------------------------------------------------- RAh: In this field is blank, the data are a continuation of the previous record. -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 05-Nov-1997