斯皮策对古尔德带星际云的巡天。II。用IRAC和MIPS观测仙王座耀斑
The Spitzer survey of interstellar clouds in the Gould Belt. II. The Cepheus Flare observed with IRAC and MIPS
摘要：
我们给出了斯皮策IRAC（~2度^2）和MIPS（~8度^2）对仙王座耀斑的观测结果，仙王座耀斑与古尔德带有关，距离约为300 pc。在所有四个IRAC波段中检测到约6500个源，其中约900个具有MIPS 24微米检测。利用色星等图技术，我们识别出133个YSO候选天体，其中大部分与NGC 7023反射星云有关。利用导航星表II和IRAS暗源星表进行了交叉鉴别，并构造了光谱能量分布（SED）。进行SED建模以估计红外过量程度。结果发现，绝大多数的磁盘光学厚吸积盘，这表明有很少的磁盘演化在这些来源。最近邻星团分析确定了四个小的原恒星群（L1228、L1228 N、L1251 A和L1251 B），每个原恒星群有5-15个成员，而较大的NGC 7023星协有32个YSO成员。发现有原恒星团的核心和没有原恒星团的核心的恒星形成效率分别为~8%和~1%。核心L1155，L1241和L1247被证实是无星的，直到我们的光度极限L_bol=0.06 L_sol。
英文摘要：
We present Spitzer IRAC (~2 deg^2) and MIPS (~8 deg^2) observations of the Cepheus Flare which is associated with the Gould Belt, at an approximate distance of ~300 pc. Around 6500 sources are detected in all four IRAC bands, of which ~900 have MIPS 24 micron detections. We identify 133 YSO candidates using color-magnitude diagram techniques, a large number of the YSO candidates are associated with the NGC 7023 reflection nebula. Cross identifications were made with the Guide Star Catalog II and the IRAS Faint Source Catalog, and spectral energy distributions (SED) were constructed. SED modeling was conducted to estimate the degree of infrared excess. It was found that a large majority of disks were optically thick accreting disks, suggesting that there has been little disk evolution in these sources. Nearest-neighbor clustering analysis identified four small protostellar groups (L1228, L1228N, L1251A, and L1251B) with 5-15 members each and the larger NGC 7023 association with 32 YSO members. The star formation efficiency for cores with clusters of protostars and for those without clusters was found to be ~8% and ~1% respectively. The cores L1155, L1241, and L1247 are confirmed to be starless down to our luminosity limit of L_bol=0.06 L_sol.
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