北美方向的类O星和鹈鹕星云
O-like Stars in the Direction of the North America and Pelican Nebulae
摘要：
在覆盖北美和鹈鹕星云复合体的区域中，我们确定了13颗暗星，它们的J-H和H-Ks色指数模拟了严重变红的O型星。其中一颗是CP 05 -4，被Comeron和Pasquali（2005）归类为O 5 V。结合这些恒星在通带I、J、H、Ks和[8.3]中的星等，我们可以推测其中两颗是碳星，五颗是晚期M型AGB星。这些恒星方向的星际消光是根据J-H与H-Ks图中的背景红团巨星和Ks通带中的恒星计数来估计的。发现有四到五颗恒星有相当大的可能性是O型星，对北美洲和鹈鹕的电离有贡献。如果它们真的是O型星，那么它们的星际消光A（V）应该在16 ~ 35等。其中两颗星似乎是Matthews和Goss（1980）发现的明亮的E和J射电环的原因。
英文摘要：
In the area covering the complex of the North America and Pelican nebulae we identified 13 faint stars with J-H and H-Ks color indices which simulate heavily reddened O-type stars. One of these stars is CP05-4 classified as O5 V by Comeron and Pasquali (2005). Combining magnitudes of these stars in the passbands I, J, H, Ks and [8.3] we were able to suspect that two of them are carbon stars and five are late M-type AGB stars. Interstellar extinction in the direction of these stars was estimated from the background red clump giants in the J-H vs. H-Ks diagram and from star counts in the Ks passband. Four or five stars are found to have a considerable probability of being O-type stars, contributing to the ionization of North America and Pelican. If they really are O-type stars, their interstellar extinction A(V) should be from 16 to 35 mag. Two of them seem to be responsible for bright E and J radio rims discovered by Matthews and Goss (1980).
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