Star formation and molecular clouds |
| |
Authors: | A L Gyulbudaghian |
| |
Institution: | (1) V. A. Ambartsumyan Byurakan Astrophysical Observatory, Byurakan, Armenia |
| |
Abstract: | The hypothesis advanced by V. A. Ambartsumyan according to which stars are formed from prestellar superdense objects-- protostars--
was an alternative to the hypothesis of the 1950's (and even now, not much changed) according to which stars are formed by
accretion with subsequent collapse (in various modifications). Ambartsumyan's basic inferences were based on an analysis of
the observational data available at that time. This paper presents both Ambartsumyan's pioneering ideas and some modern hypotheses
of star formation. Some results from studies of molecular clouds and star formation regions are also discussed. One of the
distinctive features of young stellar objects (YSO) is the outflow of matter from these objects (molecular, in the form of
jets, etc.), a phenomenon whose importance for the evolution of stars was noted by Ambartsumyan as long ago as 1937. Radial
systems of dark globules are examined, as well as H-H objects associated with star formation regions, cometary nebulae, and
close Trapeziumtype systems (consisting of YSO).
Translated from Astrofizika, Vol. 52, No. 2, pp. 185–202 (May 2009). |
| |
Keywords: | stars formation molecular clouds protostars |
本文献已被 SpringerLink 等数据库收录! |
|