Recent theoretical progress in understanding the origin and nature of Type I and Type II supernovae is discussed. New Type II presupernova models characterized by a variety of iron core masses at the time of collapse are presented and the sensitivity to the reaction rate /sup 12/C(..cap ...
Type I supernova 第一型超新星 Type II supernova 第二型超新星 Tarantula Nebula 蜘蛛星云 ... www.for68.com|基于5个网页 2. 第二类超新星 我们刚刚叙述的,是天文学家所谓的「第二类超新星」 (Type II supernova)的由来 ,这些星球是核心一旦几乎变成全是铁原子 …tw.knowledge.yahoo.com|基于2个网页...
K Nomoto,H Umeda,I Hachisu,M Kato,T Tsujimoto 摘要: We study how Type Ia/II supernova rates at various redshifts can be used to constrain the cosmic star formation rate (CSFR) history. We use a spectrophotometric model of galaxy evolution which provides a self-consistent description of ...
When a supernova is observed, it can be categorized in the Minkowski–Zwicky supernova classification scheme based upon the absorption lines that appear in its spectrum.[4] A supernova is first categorized as either a Type I or Type II, then subcategorized based on more specific traits. Sup...
Supernova remnants (SNRs) are the product of stellar explosions. From them we can learn much about the late stages of stellar evolution, mass-loss processes in stars, and explosive nucleosynthesis. The events involve the ejection of several solar masses
Related to Type I hypersensitivity reactions:immediate hypersensitivity reaction allergy an abnormal reaction of the body to an allergen, manifested by runny nose, skin rash, wheezing, etc.; hypersensitivity to the reintroduction of an allergen
supernova (redirected fromType IIa supernova) Thesaurus Encyclopedia Related to Type IIa supernova:Type II supernova su·per·no·va (so͞o′pər-nō′və) n.pl.su·per·no·vae(-vē)orsu·per·no·vas A rare celestial phenomenon involving the explosion of a star and resulting in...
Core-collapse supernovae are explosions of massive stars at the end of their evolution. They are responsible for metal production and for halting star formation, having a significant impact on galaxy evolution. The details of these processes depend on th
- The pervasive limit of systematic uncertainties reached by cosmography based on Cepheids and Type Ia supernovae (SNe Ia) warrants a search for complementary approaches. - Type II SNe have been shown to offer such a path. Their distances can be well constrained by luminosity-based or ...
Supernovae have been spectroscopically classified into Type I and Type II according to the absence and presence of hydrogen in their optical spectra. Type I supernovae (SNe I) are further subclassified into la, Ib, and Ic. As shown in Figure 1 (Branch et al . 1991), the early-time ...