S142电离氢区──分子云复合体的红外发射研究

Infrared Study of the HⅡ Region─Molecular Cloud Complex S142

本文使用ＩＲＡＳ巡天数据的最新版本ＩＲＡＳ巡天图（ＩＳＳＡ─ｃｏａｄｄｅｄ），经过进一步处理，得到了Ｓ１４２复合体红外发射的强度、温度及尘埃的分布。分析结果表明，分子云复合体的红外发射（在３０角分的尺度范围内）总光度１．１×１０４Ｌ⊙，红外连续发射在１２μｍ和１００μｍ有着较大的延伸，热而小的尘埃微粒的平均色温是１７０Ｋ，冷而大的尘埃平均色温为２９Ｋ，尘埃粒子密度随着对于最大值位置的偏移而迅速下降，ＨⅡ区内尘埃是严重衰减的。

The infrared emission behaviour of HⅡ region─molecular cloud complex S142 is examined through the IRAS Sky Survey Atlases.The IRAF and sky view software are used to analyze and thus the contours of the infrared intensity,the color temperature and the optical depth of S142 are presented.The results show that the total infrared luminosity in the ￣ 30pc region is 1.1×104L⊙.The IR thermal continum emission has a larger extention at 12μm and 100μm.The mean dust temperature is 170K for smsall hot grains and 29K for large colder grains.The amount of dust grains falls off rapidly away from the peak position.Dust with in S412 is seriously depleted.