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HD 154344


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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:
Proper Names   (Edit)
HD 1989HD 154344
TYCHO-2 2000TYC 3507-1512-1
USNO-A2.0USNO-A2 1350-09061297
HIPHIP 83354

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