EDP Sciences
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Volume 386, Number 1, April IV 2002
Page(s) 237 - 243
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020201

A&A 386, 237-243 (2002)
DOI: 10.1051/0004-6361:20020201

Symbiotic stars on Asiago archive plates. II

U. Munari1 and R. Jurdana-Sepic2

1  Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy
2  Physics Department, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia

(Received 20 November 2001 / Accepted 23 January 2002)

The Asiago photographic archive has been searched for plates containing the symbiotic stars Hen 2-468, QW Sge, LT Del, V407 Cyg, K 3-9, V335 Vul, FG Ser and Draco C-1. A total of 635 plates imaging the program stars have been found and the brightness estimated using the Henden & Munari (2000) UBV(RI) $_{\rm C}$ photometric sequences. These historical data have allowed for the first time the determination of the orbital periods of Hen 2-468 (774 days) and QW Sge (390.5 days), a significant improvement in the orbital period of LT Del (465.6 days) and for V407 Cyg an evaluation of the Mira's pulsation period and complex lightcurve shape in the red ( R and I bands). Some previously unknown outbursts have been discovered too.

Key words: stars: binaries: symbiotic

Offprint request: U. Munari, munari@pd.astro.it

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