morphology of Horizontal Branch one obtains — in the frame of present knowledge of star-evolution —a suggestion for accepting high helium content ( Y -0.30) with a relatively small age (1–2×10 9 yr) for the evolving stars.Some correlations among lifetimes of evolutionaries stages are ...
The E-AGB stage of S-stars in the Magellanic Clouds is confirmed by a comparison of effective temperature distributions of S- and N-stars and theoretical distributions of stars in E-AGB and TP-AGB stages. 展开 年份: 1988 收藏 引用 批量引用 报错 分享 ...
The extent to which the physical conditions (variations of the distributions of temperature and density) in protostellar objects affect the chemical evolution in the process of star formation is studied. A set of models with various complexity describing the chemical evolution of protostellar objects ...
The main aim of this study is to investigate the water maser and centimeter continuum emission (likely tracing thermal free-free emission) in sources at different evolutionary stages, using the evolutionary classifications proposed by Palla et al (1991) and Molinari et al (2008). We used the ...
3.AstronomyChange in the structure, chemical composition, or dynamical properties of a celestial object or system such as a planetary system, star, or galaxy. Evolution often changes the observable or measurable characteristics of the object or system. ...
This paper explores current developments in evolutionary and bio-inspired approaches to autonomous robotics, concentrating on research from our group at the University of Sussex. These developments are discussed in the context of advances in the wider fields of adaptive and evolutionary approaches to AI...
The effects of mass loss on the final evolutionary stages of stars producing white dwarfs is also discussed. In particular, the interaction of the wind from the hot central star with the surrounding planetary nebula is considered. Finally, the problem of the origin of hydrogen-deficient stars is...
IRAS 00213+6530 harbors a multiple system of low-mass protostars, indicating that star formation in this cloud is taking place in groups or clusters, rather than in isolation. The low-mass YSOs found in IRAS 00213+6530 are in different evolutionary stages, suggesting that star formation ...
Mycoheterotrophs have experienced plastome gene reduction, which can be categorized by stages of degradation [40,41,42,43]. Orchids that lack the ndh gene can be categorized as degradation stage 1. In degradation stage 2, photosynthesis-related genes (pet, psa, psb, rpo) are usually reduced ...
Garokk, AKAThe Petrified Man, who had previously been attuned to the Land. HE saw this as a last chance to enjoy the simple pleasures of uncomplicated creation before engaging in the final stages of his plan to evolutionarily accelerate the entire planet. Many of the Savage Land’s residents...