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The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| YY Geminorum. I - Photometry and absolute dimensions
Over 2000 photoelectric observations in V, R, and I of YY Geminorum(dM1e+dM1e) from six nights in 1971 were analyzed. There is evidence ofa period increase since 1950. Secondary variations were detected betweenphases 0.52 and 0.90. It is suggested that the secondary variations arethe result of a starspot on the secondary rather than on the primary, aswas reported by Kron (1952). A photometric solution was derived, and theabsolute dimensions for both components were determined by combining thephotometric solution and the spectroscopic solution of Bopp (1974). Theeffective temperature calculated from the luminosities derived fromparallax and radii were higher by about 200 K than the value indicatedby Johnson's (1966) infrared color-temperature calibration forlower-main-sequence stars.
| A Photoelectric Study of the Dwarf M Eclipsing Variable YY Geminorum.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952ApJ...115..301K&db_key=AST
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | תאומים |
| התרוממות ימנית: | 07h33m33.27s |
| סירוב: | +32°37'34.3" |
| גודל גלוי: | 8.129 |
| מרחק: | 10000000 פארסק |
| תנועה נכונה: | -1.3 |
| תנועה נכונה: | -27.4 |
| B-T magnitude: | 9.852 |
| V-T magnitude: | 8.272 |
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