Our H2O observations confirm that water masers can occur at the earliest phases of the formation of high luminosity stars, much before the development of an ionized region detectable in the radio continuum, and that they are closely connected with molecular outflows....
These detections establish that benzonitrile is not unique to TMC-1; rather, aromatic chemistry appears to be widespread throughout the earliest stages of star formation, probably persisting at least until the initial formation of a protostar. The abundance of benzonitrile far exceeds predictions from...
Star FormationCelestial BodyA possible scenario for the evolution of the universe following the big bang at t > 10-5 sec is considered. The necessary conditions that must be present for the formation of stars and stellar systems to be possible are formulated. As a condition for the formation ...
Star formation in molecular clouds usually occurs in a two-step process. Supersonic flows first compress the clouds into dense filaments light-years long, after which gravity collapses the densest material in the filaments into cores. Massive cores, each more than about twenty solar–masses, prefer...
Protostars/T Tauri phase or Brown Dwarfs The process of star formation begins with hot clumps of molecules forming inside a gas cloud to create a protostar, with the object remaining in this contraction stage as long as material continues to fall inward. Forour Sun, this protostar phase would...
We find that S stars are losing copious amounts of mass at rates comparable to that of the carbon stars. There are indications that the gas-to-dust ratio is higher than for carbon stars. To aid in determining the evolutionary status of the S-type stars, we are also searching the ...
We present a first study of the star-forming compact dust condensations revealed by <italic>Herschel</italic> in the two 2° × 2° Galactic Plane fields centered at [<inline-formula content-type="tex"/>, <italic>b</italic>] = [30°, 0°] and [<inline-f
gossypii were successfully obtained through a previously established induction platform, and the morphological characteristics, developmental dynamics, and temporal gene expression were examined. Subsequently, signaling pathways potentially involved in regulating the growth, development, and reproduction of sexual ...
For example, early-warning signals of approaching critical transitions may manifest in localised spatial pattern formation of vegetation within years as observed for the Amazon rainforest. In contrast, the susceptibility of ice sheets to tipping dynamics can unfold at basin to sub-continental scales, ...
Stars: formationA total of 197 relatively isolated high-mass star-forming clumps were selected from the Millimeter Astronomy Legacy Team 90 GHz (MALT90) survey data and their global chemical evolution investigated using four molecular lines, NH(1--0), HCO(1--0), HCN (1-0), and HNC (1-...