一颗由Sylvia 87掩星观测到的近距离双星
A Close Binary Star Resolved from Occultation by 87 Sylvia
摘要：
恒星BD+29 1748在2006年12月18日被小行星87 Sylvia掩星后被认为是一颗近距离双星。在相距约80公里的两个地点用四架望远镜观测了这一事件。在一个站点观察到两个通量下降，而在另一个站点仅检测到一个通量下降。从Sylvia的长期变化，我们推断出在掩星期间阴影的可能形状，这反过来又限制了双星参数：BD+29 1748的两个分量在天空中的投影距离为0.097”至0.110”，位置角为104度至107度。这颗小行星被清晰地分辨出来，投影到掩星方向的大小范围为130至290公里。87 Sylvia的两个已知小卫星都没有被发现掩星。
英文摘要：
The star BD+29 1748 was resolved to be a close binary from its occultation by the asteroid 87 Sylvia on 2006 December 18 UT. Four telescopes were used to observe this event at two sites separated by some 80 km apart. Two flux drops were observed at one site, whereas only one flux drop was detected at the other. From the long-term variation of Sylvia, we inferred the probable shape of the shadow during the occultation, and this in turn constrains the binary parameters: the two components of BD+29 1748 have a projected separation of 0.097" to 0.110" on the sky with a position angle 104 deg to 107 deg. The asteroid was clearly resolved with a size scale ranging from 130 to 290 km, as projected onto the occultation direction. No occultation was detected for either of the two known moonlets of 87 Sylvia.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
