Results 261 to 270 of about 3,871,291 (295)

Molecular shocks in star forming regions

Astrophysics and Space Science, 1995
The role of excited molecular hydrogen as a powerful observational tool is examined in the context of shock phenomena in molecular clouds, particularly in star forming regions. Conclusions that may be drawn from line intensities and line profiles, and the properties of J and C shocks in a bow shock structure are discussed.
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The Chemistry of Star Forming Regions

1998
Abstract The first generation of stars formed in gas that was almost entirely hydrogen and helium, and the chemistry that was important during their births, is treated in Chapter 3. In this chapter we focus on star forming regions in which elements more massive than helium a.re important in the chemistry that controls star formation ...
T W Hartquist, P Caselli
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Masers in Star-Forming Regions

1999
The subject of astronomical masers is now more than forty years old, and as a consequence, several good reviews have appeared in print. For the readers who want to enter the subject of astronomical masers in a serious way, we want to recommend two reviews (Elitzur 1982; Reid and Moran 1988) and a book (Elitzur 1992a).
N. D. Kylafis, K. G. Pavlakis
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Acetaldehyde in star-forming regions

Advances in Space Research, 2004
Abstract Observations of acetaldehyde (CH 3 CHO) in a survey of nine star-forming regions are presented. Emission is clearly detected from both the A and E symmetry states in the 4 04 –3 03 and 5 05 –4 04 transitions. Both the range of the measured CH 3 CHO column densities (∼4×10 12 –10 14 cm −2 ), and the derived fractional abundances, are in ...
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Kinematics of Star-Forming Regions

2015
The previous chapters on star-forming regions have focussed on the spatial distributions of gas and stars. This chapter therefore focusses on the internal kinematics of the young stars within the star-forming regions. Our discussion covers the kinematics of objects in OB associations and young star clusters as well as star-forming regions, detailing ...
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Clumpiness in Star Forming Regions

Astrophysics and Space Science, 2003
In this article, some aspects of the clumpy nature of molecular clouds are reviewed. In particular the observational evidence for small-scale structures both in low and high mass star forming regions will be discussed. I will review some examples of `clumpiness' such as: i) the molecular clumps ahead of HH objects and how the study of the physical and ...
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Chemistry of Star-Forming Regions

2017
Birth of protostars significantly affects chemical compositions of parent molecular clouds. Observational results of low-mass and high-mass star-forming regions are summarized, which show significant chemical differentiation within a source as well as among sources.
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Star Formation and Star-Forming Regions

2020
J E Dyson, D A Williams
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Radiation shielding of protoplanetary discs in young star-forming regions

Monthly Notices of the Royal Astronomical Society, 2023
Simon Portegies Zwart, Brooke Polak, Mordecai-Mark Mac Low   +2 more
exaly  

Overview of Star-Forming Regions

2015
The dynamical evolution of young star clusters and associations is an evolving interplay of the gravitational potential, as determined by the spatial distribution of volume densities and the motions of both the gas and stars. In this chapter we briefly discuss several nearby star-forming regions which are relevant to our discussion on the dynamics of ...
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