A survey of T Tauri stars with AKARI towards the Taurus-Auriga region
A survey of T Tauri stars with AKARI towards the Taurus-Auriga region
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DOI：
10.1051/0004-6361/200913475
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发表时间：
2010-06
影响因子：
6.5
通讯作者：
S. Takita;H. Kataza;Y. Kitamura;D. Ishihara;Y. Ita;S. Oyabu;M. Ueno
中科院分区：
文献类型：
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作者：
S. Takita;H. Kataza;Y. Kitamura;D. Ishihara;Y. Ita;S. Oyabu;M. Ueno
上下文日本第一颗红外天文卫星AKARI完成了中红外至远红外波长的全天巡天，其空间分辨率和灵敏度高于以前的红外天文卫星巡天。目标。我们利用AKARI全天巡天的中红外波段（MIR）在9和18 μm波段寻找新的金牛座T星星（TTS）候选者。方法.我们使用的点源目录（PSC）获得的红外相机（IRC）上AKARI。我们结合了2 MASS PSC和第三版的USNO CCD星表（UCAC）与AKARI IRC-PSC，并调查了517个已知的TTS超过1800平方度的金牛座-御夫座地区的一部分，制定标准，提取TTS。我们认为渐近巨星分支（AGB）的恒星，后AGB的恒星，行星状星云（PNE），和星系，有类似的MIR颜色，从这些来源中分离TTS。我们最终在相同的Taurus-Auriga地区从AKARI IRC-PSC中搜索了新的TTS候选者。结果在517个已知的TTS中，我们检测到133个AKARI源：46个IRAS未检测到。基于AKARI、2 MASS和UCAC巡天的色-色图和色-星等图，我们提出了从AKARI全天数据中提取TTS候选者的标准，在AKARI探测到的133个TTS中，有68个符合这些标准。根据我们的标准，我们选择了176/14725 AKARI源作为TTS候选人，位于金牛座-御夫座地区。与SIMBAD比较，我们发现148个以前确认的源，包括115个年轻恒星（YSO）和28个未确认的源。结论.基于SIMBAD鉴定，我们推断TTS鉴定概率使用我们的标准为75%。我们找到了28个TTS候选者，我们预计一旦获得后续观察结果，其中21个将得到确认。虽然出现概率不高，但受SIMBAD数据库完整性的影响，我们可以在整个天空和所有恒星形成区搜索TTS。
Context. The first Japanese infrared astronomical satellite, AKARI, has completed an All-Sky Survey at mid- to far-infrared wavelengths with higher spatial resolutions and sensitivities than the previous survey with Infrared Astronomical Satellite (IRAS). Aims. We search for new T Tauri star (TTS) candidates with the mid-infrared (MIR) part of the AKARI All-Sky Survey at 9 and 18 μm wavelengths. Methods. We used the point source catalogue (PSC) obtained by the Infrared Camera (IRC) on board AKARI. We combined the 2MASS PSC and the 3rd version of the USNO CCD Astrograph Catalogue (UCAC) with the AKARI IRC-PSC, and surveyed 517 known TTSs over a 1800-square-degree part of the Taurus-Auriga region to develop criteria to extract TTSs. We considered asymptotic giant branch (AGB) stars, post-AGB stars, planetary nebulae (PNe), and galaxies, which have similar MIR colours, to separate TTSs from these sources. We finally searched for new TTS candidates from AKARI IRC-PSC in the same Taurus-Auriga region. Results. Of the 517 known TTSs, we detected 133 sources with AKARI: 46 sources were not detected by IRAS. Based on the colour−colour and colour−magnitude diagrams made from the AKARI, 2MASS, and UCAC surveys, we propose the criteria to extract TTS candidates from the AKARI All-Sky data, and 68/133 AKARI detected TTSs have passed these criteria. On the basis of our criteria, we selected 176/14725 AKARI sources as TTS candidates that are located around the Taurus-Auriga region. Comparing these sources with SIMBAD, we found that 148 are previously identified sources including 115 young stellar objects (YSOs), and 28 unidentified sources. Conclusions. Based on SIMBAD identifications, we infer the TTS-identification probability using our criteria to be ∼75%. We find 28 TTS candidates, of which we expect ∼21 to be confirmed once follow-up observations can be obtained. Although the probability of ∼75% is not so high, it is affected by the completeness of the SIMBAD database, and we can search for TTSs over the whole sky, and all star-forming regions.