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Photometric analysis of the eclipsing binary star AI Draconis
New photometric data from the eclipsing binary star AI Draconis has beenanalyzed with the method of Wilson-Devinney. The system shows a periodincrease of about 0.91 sec per century, which corresponds to a masstransfer from the less to the more massive component at a rate of 7.510-7 Msun/yr under the conservative mass transferhypothesis. We also suggest that the system has an unseen componentwhich orbits around the mass center of the triplet system with a periodof about 23 yrs. We found that the projectional angular separationbetween the third star and eclipsing pair varies from 0.048 arcsec to0.235 arcsec. These results suggestive of a third body should be checkedin the future with more sensitive observations. Table 1 is onlyavailable electronically with the On-Line publication athttp://link.springer.de/link/service/00230/
| Stellar spectrophotometric standards. II
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Observation and Astrometry data
| Constellation: | Dragon |
| Right ascension: | 17h02m08.26s |
| Declination: | +51°56'32.4" |
| Apparent magnitude: | 7.846 |
| Distance: | 162.602 parsecs |
| Proper motion RA: | -8 |
| Proper motion Dec: | -53.8 |
| B-T magnitude: | 8.109 |
| V-T magnitude: | 7.868 |
Catalogs and designations:
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