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研究人员利用LAMOST数据揭示GSE矮星系对银河系恒星晕结构的影响（图）
LAMOST数据 GSE矮星系 银河系 恒星晕结构
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2023/1/12
近期，国家天文台博士生吴文博、赵刚研究员和薛香香研究员等人利用我国郭守敬望远镜（LAMOST）巡天光谱数据，揭示了约110亿年前银河系经历的GSE（Gaia-Sausage-Enceladus)主并合事件对银河系恒星晕整体结构的影响。通过分析银晕中K巨星的运动学参数和空间分布，研究人员发现银河系恒星晕呈现出内扁外圆的“洋葱”结构，而此次GSE主并合事件可能对银河系恒星晕的结构产生了很大影响，导致银...
研究人员在LAMOST数据发现600多颗处于特殊演化阶段的S型恒星（图）
LAMOST数据 S型恒星 特殊演化阶段
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2023/1/13
近日，国家天文台陈静博士、罗阿理研究员、李荫碧副研究员及合作者利用LAMOST DR9中分辨光谱数据发现了606颗特殊演化阶段的S型恒星，这是自1984年以来一次性搜寻S型恒星数量最多的研究工作，在这之前，已发现的S型恒星约有1000余颗，该工作极大地扩充了S型恒星的样本，这为进一步研究恒星的演化以及慢中子俘获过程提供了极佳的资源。这也体现了LAMOST大样本光谱数据在证认特殊天体方面的优势。该成...
Wei-xiong Huang Explain Cosmic Mysteries-Black Holes Do Not Exist
stellar mass black holes
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2015/5/28
1. Celestial body center temperature is proportional to cube root of stellar mass. 2. When stellar temperature exceeds boiling point of all elements, stellar density is inversely proportional to cube ...
Reason Of Stellar Rotation
stellar mass center temperature gasification substances swirl stellar rotation
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2015/5/28
When stellar center gasification substance thermal expansion force is greater than stellar center minimum pressure, from stellar center, pressure minimal two symmetrical directions, jet out two shares...
Glycine oligomerization up to triglycine by shock experiments simulating comet impacts
comet impacts amino acids peptides shock experiments origins of life
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2017/4/10
We conducted shock experiments simulating comet impacts to assess the feasibility of peptide synthesis by such a
process. We used frozen mixture of the amino acid glycine, water ice, and silicate (fo...
Gyroscopic Pumping in the Solar Near-Surface Shear Layer
Gyroscopic Pumping Solar Near-Surface
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2011/9/29
We use global and local helioseismic inversions to explore the prevailing dynamical balances in the solar Near-Surface Shear Layer (NSSL). The differential rotation and meridional circulation are inti...
Central free-free-dominated 880 $\micron$ emission in II Zw 40
dust, extinction—galaxies: dwarf—galaxies: evolution—galaxies: individual(II Zw 40)— H II regions— submillimetre: galaxies
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2011/10/20
The central star-forming region in a blue compact dwarf galaxy, II Zw 40, was observed in the 340 GHz ($880 \micron$) band at $\sim 5$ arcsec (250 pc) resolution with the Submillimetre Array (SMA). A ...
Radio continuum observations of new radio halos and relics from the NVSS and WENSS surveys
Radio Continuum: galaxies – Galaxies: Clusters: general, intracluster medium – Cosmology: large-scale structure of Universe
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2011/10/20
Radio halos and relics are diffuse radio sources found in galaxy clusters showing significant substructure at X-ray wavelengths. These sources provide important information about non-thermal processes...
AMBER high-spectral resolution interferometry of Be stars: More than just stars and disks?
high-spectral resolution interferometry stars disks
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2011/10/17
High spectral-resolution Br-gamma VLTI/AMBER observations of classical Be stars reveal complex visibility, phase, and closure phase profiles, which were not seen in previous lower-resolution data. The...
The beaming of external Compton emission
galaxies active radiation mechanisms nonthermal gamma rays theory
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2011/10/21
We consider a relativistically moving blob consisting of an isotropic electron distribution that Compton-scatters photons from an external isotropic radiation field. We compute the resulting beaming p...
On using the beaming effect to measure spin-orbit alignment in stellar binaries with Sun-like components
measure spin-orbit alignment stellar binaries Sun-like components
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2011/10/13
The beaming effect (aka Doppler boosting) induces a variation in the observed flux of a luminous object, following its observed radial velocity variation. We describe a photometric signal induced by t...
The Factory and The Beehive I. Rotation Periods For Low-Mass Stars in Praesepe
Factory Beehiv Rotation Periods Low-Mass Stars Praesepe
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2011/10/12
Stellar rotation periods measured from single-age populations are critical for investigating how stellar angular momentum content evolves over time, how that evolution depends on mass, and how rotatio...
A dim candidate companion to εCephei
candidate companion εCephei
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2011/10/12
Using a vector vortex coronagraph behind the 1.5-m well-corrected subaperture (WCS) at Palomar, we detected a second object very close to \epsilon Cephei, a \delta Scuti F0 IV star. The candidate comp...
Two New Cataclysmic Variables in Lyra
Cataclysmic Variables
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2011/10/11
I report on the discovery of two cataclysmic variables in the same field in Lyra originally identified from their magnitudes in USNO-B1.0 catalogue and Palomar images. The historical light curves were...
Rossby waves and polar spots in rapidly rotating stars: Implications for stellar wind evolution
magnetic fi eld – Stars: activity – Stars: starspots – Stars: oscillations – Physical data and processes: Magnetohydrodynamics
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2011/10/10
Rapidly rotating stars show short-period oscillations in magnetic activity and polar appearance of starspots. The aim of this paper is to study large-scale shallow water waves in the tachoclines of ra...