氧气丰富的超级巨星VY Canis Majoris风中的化学复杂性
L M Ziurys1, S N Milam, A J Apponi
1NASA Astrobiology Institute, Tucson, Arizona 85721, USA. lziurys@as.arizona.edu
来自像VY Canis Majoris这样的红色超巨星的富含氧气的恒星外流拥有各种各样的分子. 这些发现挑战了富含碳的环境在化学上比富含氧气的环境更复杂的观念.
科学领域:
- 天文学和天体物理学
- 天体化学是天体化学.
- 恒星进化 恒星进化
背景情况:
- 星际介质被进化的恒星丰富,形成环恒星包裹,促进气相化学.
- 这些包裹中的化学复杂性被认为主要取决于碳与氧的比率,富含碳的环境显示出更高的分子丰度.
研究的目的:
- 为了研究红超巨星VY Canis Majoris (VY CMa) 富含氧气的环恒星外的分子组成.
- 为了确定富含氧气的贝是否可以表现出与富含碳的贝相比的显著化学多样性.
主要方法:
- 在VY CMa.的环恒星外中对分子物种的观察.
- 分析光谱线形状,以区分出流中的不同动力学区域产生的分子.
主要成果:
- 识别出意想不到的化学化合物,包括化 (NaCl),化 (PN),同化 (HNC) 和甲基离子 (HCO+).
- 从三个动力学区域产生的分子的区分:球形的外流,协同的蓝移扩张和定向的红移流.
- 通过这些区域选择性地追踪不同的分子物种,其中一些分子仅在球体流中,而另一些分子在膨胀中,可能是由于冲击波. 值得注意的是,化 (HCN) 丰富度与一氧化碳 (CO) 相当,尽管环境富含氧气.
结论:
- 富含氧气的环恒星外可以像它们富含碳的对应物一样具有化学多样性.
- 在VY CMa的外中观察到的复杂化学质量挑战了以前仅基于元素比率的假设.
更多相关视频
07:24Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
Published on: February 19, 2018
09:38Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
相关概念视频
Classifying Matter by Composition
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
The Supercomplexes in the Crista Membrane
Mass Spectrometry: Complex Analysis
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Oxygen Transport in the Blood
Oxygenic Photosynthesis
