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J/AJ/109/359                   H235 in NGC 752                    (Milone+ 1995)

Observations and Analysis of the Contact Binary H235 in the Open Cluster NGC 752 Milone E.F., Stagg C.R., Sugars B.A., McVean J.R., Schiller S.J., Kallrath D. H. Bradstreet J. <Astron. J. 109, 359 (1995)> =1995AJ....109..359M
ADC_Keywords: Clusters, open; Stars, variable; Photometry Abstract: The short-period variable star Heinemann 235 in the open cluster NGC 752 has been identified as a contact binary with a variable period of about 0.4118 d. BVRI light curves and radial velocity curves have been obtained and analyzed with enhanced versions of the Wilson-Devinney light curve program. We find that the system is best modeled as an A-type W UMa system, with a contact parameter of 0.21 ± 0.11. The masses of the components are found to be 1.18 ± 0.17 and 0.24 ± 0.04 Msun, with bolometric magnitudes of 3.60 ± 0.10 and 5.21 ± 0.13, for the hotter (6500 K, assumed) and cooler (6421 K) components, respectively, with Delta T = 79 ± 25 K. The distance to the binary is established at 381 ± 17 pc. H235 becomes one of a relatively small number of open-cluster contact systems with detailed light curve analysis for which an age may be estimated. If it is coeval with the cluster, and with the detached eclipsing and double-lined spectroscopic binary H219 (DS And), H235 is ∼1.8 Gyr old, and may provide a fiducial point for the evolution of contact systems. There is, however, evidence for dynamical evolution of the cluster and the likelihood of weak interactions over the age of the binary precludes the determination of its initial state with certainty. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3 80 867 Photoelectric light curve data
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian Date 15- 20 F6.4 --- Ph1 *[0/1[ Phase of minima from ephemeris 1 23- 28 F6.4 --- Ph3 *[0/1[ Phase of minima from ephemeris 3 31- 35 F5.3 mag dVmag Differential V magnitude 38- 42 F5.3 mag dBmag Differential B magnitude 45- 49 F5.3 mag dRmag Differential R magnitude 52- 56 F5.3 mag dImag Differential I magnitude 59- 64 F6.3 mag d(B-V) Differential (B-V) color 67- 72 F6.3 mag d(V-R) Differential (V-R) color 75- 80 F6.3 mag d(V-I) ?Differential (V-I) color
Note on Ph1: Phase of minima calculated using ephemeris (1) from printed paper: E0 = 2 447 815.338(3), P = 0.411 83(12)d Note on Ph3: Phase of minima calculated using ephemeris (3) from printed paper: E0 = 2 446 785.8660(23), P = 0.411 775 0(10)d
Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 29-Apr-1995 (HJD completed at CDS)
(End) [CDS] 10-Jul-1995
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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