Infrared variability of symbiotic stars

Strafella, F.; Calamai, G.; Fuensalida, J. J.; Lorenzetti, D.; Saraceno, P.
Bibliographical reference

CNR, National Conference on Infrared Astronomy, 2nd, Vulcano, Italy, Sept. 14-18, 1987 Società Astronomica Italiana, Memorie (ISSN 0037-8720), vol. 58, no. 2-3, 1987, p. 233-239.

Advertised on:
0
1987
Number of authors
5
IAC number of authors
1
Citations
4
Refereed citations
3
Description
Binary models of symbiotic stars are discussed, analyzing the results of recent IR observations. It is indicated that a binary must have component masses of about 1 solar mass and a period greater than 100 days to exhibit a symbiotic spectrum, and a number of combinations of hot and cool components which would satisfy these criteria are considered. The IR data suggest the existence of two main types, corresponding to Roche-lobe filling and underfilling red giants and characterized, in some cases, by long-period variability and small-amplitude periodic variations, respectively. An ongoing symbiotic-star monitoring program at Asiago Observatory, Tenerife Observatory, and TIRGO is briefly described.