arXiv 0906.41362009-06-22astro-ph.SR

在大质量光度测量中共生星的光变曲线I：D-型系统

Light-curves of symbiotic stars in massive photometric surveys I: D-type systems

M. Gromadzki, J. Mikolajewska, P. Whitelock, F. Marang

备注：: 30 pages, 13 figures, accepted for publication in Acta Astronomica

摘要：

本文分析了13颗曾被划分为D型共生星的ASAS、SAMO、OGLE和SAAO JHKL的光变曲线。大多数的近红外光变曲线已经被监测了很多年，显示长期的变化，由于可变的尘埃遮蔽，除了恒星的脉动。到这些天体的距离是从周期光度关系和从Ko-[12]色得到的质量损失率的估计得出的。我们将AS 245重新分类为S型共生体，具有半规则的冷组分，脉动周期约为一年。首次估算了SS 7338（463天）、AS 210（423天）和H2-38（395天）的大振幅脉动周期，证实它们是共生的Miras。将共生的Miras与脉动周期相似的正常Miras进行比较，发现共生星的Ko-平均值较高[12]。这可能表明它们有更高的质量损失率，或者更有可能是Mira丢失的尘埃被困在双星系统中。

英文摘要：

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.

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