Paschen α Observations of Be stars Toward the SMC Cluster NGC330
Paschen α Observations of Be stars Toward the SMC Cluster NGC330
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Paschen α 对 Be 星朝向 SMC 星团 NGC330 的观测
DOI：
10.1093/pasj/65.3.55
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y
中科院分区：
文献类型：
--
作者：
Tanabe;T.;Motohara;K.;Tateuchi;K.;Matsunaga;N.;Ita;Y.;Toshikawa;K.;Konishi;M.;Kato;N.;and Yoshii;Y
我们在近红外以及两个窄带 Pa 和 Pa-off 滤光片中对年轻的 SMC 星团 NGC 330 进行了成像观察。观测是在海拔 5640 米的高海拔地点进行的，那里的大气消光足够小，使得 Patransparent 周围的光谱范围足够小。我们介绍了专门设计的窄带滤光片的校准，以及使用光度颜色识别 Paemission 的方法。我们已经在小型望远镜和窄带滤光片的探测极限内成功地检测到了几乎所有Be星的Paemission。 Paemission 的强度与 H 的强度相关性很好，这也证实了 Paemission 的正确检测。这是对 Be 星的 Paemission 线的首次系统检测。我们还发现了 Paemission 线天体的新候选者。这项工作表明，当从高海拔地点观察时，包括 Paband 在内的光度颜色可用于检测 Paline。
We made imaging observations of the young SMC cluster NGC 330 in the near-infrared,,as well as two narrow-band Paand Pa-off filters. The observations were carried out at a high-altitude site, 5640 m, where the atmospheric extinction is small enough to make the spectral range around Patransparent. We present the calibration of specially designed narrow-band filters, and the method used to identify Paemission using photometric colors. We have successfully detected Paemission from almost all Be stars within the detection limit of the small telescope and the narrow-band filters. The strength of Paemission well correlates with that of H, which also confirms the proper detection of Paemission. This was the first systematic detection of the Paemission line from Be stars. We also found new candidates of Paemission-line objects. This work demonstrates that the photometric colors, including the Paband, can be used to detect the Paline when observed from high-altitude sites.