Толстый «занавес» пыли и газа

На противоположном краю шкалы звездных возрастов находятся холодные красные гиганты, приближающиеся к концу звездной эволюции, когда они или распадаются в планетарную туманность (сбрасывая оболочку) или (что бывает реже), взрываются как сверхновые. Такие звезды выбрасывают огромные количества газа и пыли, образуя толстый «занавес», поглощающий излучение звезды и переизлучаюший его в ИК-  области.

По мере эволюции красного гиганта скорость потери массы увеличивается. Сначала звезда каждые 100 000 лет сбрасывает вещество, масса которого равна массе Солнца, а позднее то же количество вещества теряется каждые 10 000 лет. Звезду из последней группы нельзя наблюдать визуально, но можно обнаружить ее излучение в средней ИК-области. Некоторые такие звезды были известны из наземных ИК- наблюдений и радионаблюдений молекул гидроксила (ОН) — это так называемые ОН/ИК-звезды. ИРАС открыл их намного больше, в том числе и более необычные объекты.

 

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