SCUBA observations of dust around Lindroos stars: evidence for a substantial submillimetre disc population
SCUBA observations of dust around Lindroos stars: evidence for a substantial submillimetre disc population
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水肺潜水观测 Lindroos 恒星周围的尘埃：存在大量亚毫米圆盘种群的证据
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发表时间：
2003
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通讯作者：
J. Greaves
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作者：
M. Wyatt;W. Dent;J. Greaves
我们用詹姆斯·克拉克麦克斯韦望远镜在850 μm波段对Lindroos样品中的22颗年轻恒星进行了观测，以寻找尘埃盘的证据。这个样本中的恒星是B型主星的质量较小的伴星，并且有明确的年龄在10-170百万年之间;也就是说，它们即将或最近到达主星序。在其中三颗恒星（HD 112412、74067和99803 B）周围发现了尘埃。HD 74067周围的辐射在中心达到峰值，并且近似对称地分布在距离星星1070角秒的范围内。这种辐射来自于一个两个组成部分的圆盘，一个是拱星，另一个是拱双星，尘埃质量分别为0.3和>27 M O +，或者是一个不相关的背景物体。另外两个检测，我们属性的circumsecondary光盘的质量为0.04和0.3 M O +。我们还能够证明HD 112413周围存在一个环主星盘，其质量与伴星HD 112412周围的质量相似。我们的样本与IRAS星表的交叉相关只显示了朝向一颗星星（HD 1438）的25和60 μm尘埃排放的证据;在远红外数据中，没有一个亚毫米探测到的是明显的，这意味着这些圆盘是冷的（10 M O +的环双星物质可以持续到1.6亿年，这也支持了双星系统中的金牛座T盘是由环双星外壳补充的理论。
We have observed 22 young stars from the Lindroos sample at 850 μm with SCUBA on the James Clerk Maxwell Telescope to search for evidence of dust discs. Stars in this sample are the less massive companions of B-type primaries and have well-defined ages that are 10-170 Myr; i.e. they are about to, or have recently arrived on the main sequence. Dust was detected around three of these stars (HD 112412, 74067 and 99803B). The emission around HD 74067 is centrally peaked and is approximately symmetrically distributed out to ∼70 arcsec from the star. This emission arises from either a two-component disc, one circumstellar and the other circumbinary with dust masses of 0.3 and >27 M O +, respectively, or an unrelated background object. The other two detections we attribute to circumsecondary discs with masses of 0.04 and 0.3 M O +. We were also able to show that a circumprimary disc is present around HD 112413 with a similar mass to that around the companion HD 112412. Cross-correlation of our sample with the IRAS catalogues only showed evidence for dust emission at 25 and 60 μm toward one star (HD 1438); none of the submillimetre detections were evident in the far-infrared data implying that these discs are cold ( 10 M O + of circumbinary material can persist until ∼60 Myr and would also support the theory that T Tauri discs in binary systems are replenished by circumbinary envelopes.