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RZ Ophiuchi - Photometric variations and a detached configuration
A nine-year survey of multicolor intermediate-band photometry of RZ Ophreveals small but significant brightness-change variations outsideprimary eclipse. Most of these changes cannot be explained by theellipticity effect of a cool mass losing component which fills its Rochelobe. Instead, this evidence supports recent analyses that have proposeda detached configuration for this binary. Photometric and spectroscopicobservations point to the existence of a large accretion disk around thehot mass-gaining star in this binary, implying that mass transfer occursin this system by some process other than Roche lobe overflow.
| Photoelectric Observations of the Algol-Type Binary Star RZ Oph
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| A new model of the eclipsing system RZ Ophiuchi
Multicolor photometric observations of the 1984 primary eclipse of thebinary system RZ Ophiuchi have been obtained and analyzed. The ratio ofthe radii of the two components has been determined using the effectivetemperature and bolometric correction of each star, derived from itsobserved spectral classification and photometric colors, and a solutionfor the orbital inclination and the radius of each star made using thisvalue. The solution supports the 'detached model' favored by Baldwin andby Forbes and Scarfe, in which neither star fills its critical surface.The photometric results were combined with a new radial velocitysolution for the system, and physical parameters determined. It appearsthat RZ Oph may be an example of a system in a short-lived phase of'Case C' mass exchange.
| UBV photometry of the 1981 eclipse of RZ Ophiuchi
Three-color photometry of the 1981 eclipse of the long-period binary RZOph is presented. The data are combined with those of Baldwin (1978) toimprove the determination of the times of contacts. A solution assumingi = 90 deg, similar to Baldwin's, leads to the conclusion that thecooler star does not fill its Roche lobe. A solution similar to Smak's(1981), which assumes that this star does fill its lobe, is alsopossible, but leads to a value of k = 0.022 + or - 0.001, which is hardto reconcile with the stars' spectral types, relative visualluminosities, and bolometric corrections. This leaves unanswered thequestions of the origin of the material in the disk surrounding thehotter star, and of the evolutionary state of the system.
| Four-color photometry of RZ Ophiuchi and its accretion disk
An analysis is presented of four-color uvby observations of the totallyeclipsing binary RZ Ophiuchi. Photoelectric observations were obstainedcovering portions of the light curve between orbital phases 0.85 and0.35. The colors of the hot binary component are consistent with its Ibluminosity classification, however low interstellar reddening impliesthe cool component, classified K5 Ib, cannot be more luminous than atypical giant. A nonstellar distortion of the light curve in theneighborhood of primary eclipse ingress is attributed to the effects ofa thin extended accretion disk around the hot star, with a meantemperature of 4800 K and total mass of about 4 x 10 to the -7th solarmasses, and within which Rayleigh scattering from neutral hydrogen is animportant extinction source. Deviations from light-curve symmetryoutside the eclipse region are explained by azimuthal differences indisk properties.
| Vlbuw Photometry of Rz-Ophiuchi = BD+7DEG3832 - Eclipse of the Accretion Disk
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1982A&A...111..372V&db_key=AST
| An observational study of the eclipsing binary RZ Ophiuchi
Orbital elements are derived from new spectroscopic and photometricobservations. The masses and radii are inconsistent with evolutionarytracks for single stars, but neither star fills its Roche lobe. Analysisof the circumstellar Balmer emission lines indicates that the primary issurrounded by an extensive, highly flattened disk of nonuniform density.The velocity gradient in the disk is steeper than that expected fromKeplerian motion.
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Observation and Astrometry data
| Constellation: | Ophiucus |
| Right ascension: | 18h44m53.39s |
| Declination: | +07°01'17.3" |
| Apparent magnitude: | 9.393 |
| Proper motion RA: | -13.2 |
| Proper motion Dec: | 9.1 |
| B-T magnitude: | 10.223 |
| V-T magnitude: | 9.462 |
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