Long-Term Studies of Hitherto Unexplored Variables on Sonneberg Patrol Plates: O-C Aspects

Details Long-Term Studies of Hitherto Unexplored Variables on Sonneberg Patrol Plates: O-C Aspects Long-Term Studies of Hitherto Unexplored Variables on Sonneberg Patrol Plates: O-C Aspects

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..335..119v&link_type=abstract

The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Edited

Astronomy and Astrophysics

Astrophysics

Scientific paper

The light curves of 216 arbitrarly chosen field stars and of 23 known variables in the Auriga--Taurus--Orion region were derived from scanned, blue-sensitive archival patrol plates, covering a total of 34 years (1961--1995). We achieved a photometric accuracy of 0.07--0.12 mag. 17 field stars turned out to be variables, most of them with time scales of 1000--8000 days in the form of slow waves with amplitudes between 0.1 and 0.3 mag, i.e. below the threshold of traditional variable searches on photographic plates. About 50% of these new long-term variables exhibit drifts indicating periodic or erratic variability at much longer time scales than covered here. In addition, we detected long-term variations in 50% of the known variables. The above fraction of low-amplitude long-term variables among field stars implies that a total of about 45000 new variables should be detectable in the Sonneberg patrol plate archive. They will represent a new, hitherto not investigated population of variable stars with a possibly significant impact on our understanding of the stellar interior and evolution. We discuss implications for the O-C analysis of long-term periodic phenomena which can be extracted from sky patrol achives. An extensive report on these results is in press.

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