Light-curves of symbiotic stars in massive photometric surveys I: D-type systems
| Autor: | Gromadzki, M., Mikolajewska, J., Whitelock, P., Marang, F. |
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| Rok vydání: | 2009 |
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| Druh dokumentu: | Working Paper |
| Popis: | ASAS, MACHO, OGLE and SAAO JHKL light curves of 13 stars, that have at some time been classified as D-type symbiotics, are analysed. Most of the near-IR light-curves that have been monitored over many years show long-term changes due to variable dust obscuration, in addition to the stellar pulsation. The distances to these objects are derived from the period-luminosity relation and estimates of the mass-loss rates made from the Ko-[12] colour. We reclassify AS 245 as an S-type symbiotic, with a semi-regular cool component with a pulsation period of about one year. The periods of the large amplitude pulsations of SS73 38 (463 days), AS 210 (423 days) and H2-38 (395 days) are estimated for the first time, confirming that they are symbiotic Miras. A comparison of the symbiotic Miras with normal Miras of similar pulsation period shows that the symbiotic stars have on average higher values of Ko-[12]. This may indicate that they have higher mass-loss rates, or more likely that the dust which is being lost by the Mira is trapped within the binary system. Comment: 30 pages, 13 figures, accepted for publication in Acta Astronomica |
| Databáze: | arXiv |
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