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Astron. Astrophys. 355, 1164-1167 (2000)

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New astrometric binaries among HIPPARCOS stars

G.A. Gontcharov 1, A.A. Andronova 1 and O.A. Titov 2

1 Pulkovo Observatory, 196140 St. Petersburg, Russia (gaoran@mail.wplus.net)
2 Astronomical institute, St. Petersburg State University, Saint-Petersburg, Russia (olegtitov@mail.ru)

Received 10 January 2000 / Accepted 11 January 2000

Abstract

A new realization of the International Celestial Reference System (ICRS) is built upon the data of the HIPPARCOS catalogue and astrometric ground-based catalogues of the 20th century reduced to the HIPPARCOS system. Non-linear motion of some stars has been detected with this realization of the ICRS. This motion is separated into the proper motion of the barycentre and the revolution of the photocentre around the barycentre. The latter is believed to be induced by fainter components of star-like mass. The periodic motion of the photocentres of the stellar systems HIP 4427 ([FORMULA] Cas), HIP 11072, HIP 45699, HIP 54214 and HIP 116727 is discussed in detail. Related periods and amplitudes are evaluated and proposed for confirmation by other methods. The periodic motion of the photocentre of Be star [FORMULA] Cas is of particular interest.

Key words: astrometry – reference systems – catalogs – stars: binaries: general – stars: individual: gam Cas

Send offprint requests to: G.A. Gontcharov

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© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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