CDROM/AJ/V106/P2058 Photometry of V505 Sgr (Chambliss+ 1993) ================================================================================ A Photometric Investigation of the Eclipsing Binary V505 Sagittarii C. R. Chambliss, R. L. Walker, J. H. Karle, H. B. Snodgrass, & Y. A. Vracko <1993, AJ, 106, 2058> =1993AJ....106.2058C ================================================================================ Abstract: V505 Sgr is a classical Algol system consisting of an A2 V primary and a G5 IV secondary that fills its Roche lobe. New times of minimum light are presented. The period of the eclipsing system (1.18287 d) varies, due in part to an orbital light-time effect. A third component has been detected that orbits the eclipsing pair. This investigation uses the SIMPLEX algorithm [Kallrath & Linnell, ApJ, 313, 346 (1987)] and the Differential Correction code [Wilson, ApJ, 234, 1054 (1979)] to analyze two separate datasets. The results indicate the third component, an F8 V star, contributes about 5% of the light to the system. The minimum projected distance between the third component and the eclipsing pair is 37 AU. This implies an orbital period of about 105 years, a value that differs with the O-C data. The photometric solution, combined with recent spectroscopic data, yields R(1) = 2.14 R(Sun) and R(2) = 2.24 R(Sun) and M(1) = 2.20 M(Sun) and M(2) = 1.15 M(Sun). File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- karle.dat 35 1077 Karle observations of V505 Sgr -------------------------------------------------------------------------------- Comments for file: karle.dat -------------------------------------------------------------------------------- The table contains a listing of 1074 observations of V505 Sagittarii which were made by Karle during 29 nights in 1960 and 1961 with a 25-cm reflector at the Lewis and Clark College in Portland, Oregon. An RCA 1P21 photomultiplier was used, and the comparison star was HD 187664. The observations were unfiltered, and C. R. Chambliss and R. L. Walker have estimated the effective wavelength to be 4600 A. These observations were not corrected for differential extinction. The reductions for time and for delta-magnitude were made by Yura Vracko in 1990. Karle observed nine times of primary minimum light and one time of secondary minimum. These were determined by Chambliss and Walker using the method of Kwee and van Woerden (1956), and they are listed in the printed paper. A least squares solution for these times of minimum light yielded the following ephemeris: T(min) = JD 2437108.8818 + 1.1828637 E. This ephemeris has been used to calculate the phases and phase angles which appear in this table. -------------------------------------------------------------------------------- Byte-by-byte Description of file: karle.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.4 day HJD Heliocentric Julian date (2430000+) 10-18 F9.5 --- Phase Phase 19-27 F9.3 deg Phi Phase angle 28-35 F8.3 mag dM Delta magnitude -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 20-Mar-1995