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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.
| Observations of the 1981 Eclipse of RZ Oph
Not Available
| 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: | 18h44m55.70s |
| Declination: | +07°08'07.1" |
| Apparent magnitude: | 9.311 |
| Proper motion RA: | 14.4 |
| Proper motion Dec: | -18.6 |
| B-T magnitude: | 10.841 |
| V-T magnitude: | 9.438 |
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