恆星變化 的英文怎麼說
中文拼音 [héngxīngbiànhuà]
恆星變化
英文
sidereal variation-
Cepheid variable stars are stars whose brightness changes at regular periods
造父變星是一種光線按規律周期發生變化的恆星。Motion of a star across the line of sight causes no change in its spectrum.
恆星橫越視線方向的運動，在它的光譜中不會引起什麼變化。Many planets ( for example, ganymede, mercury, the earth, jupiter and saturn ) and stars ( for example, the sun ) possess intrinsic magnetic fields. the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists. this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars. it is the fluid motions, usually driven by thermal convection, that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars. in planets, the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation, magnetic fields and spherical geometry. the key dynamics involves the interaction between the coriolis and lorentz forces. in the sun, it is the solar tachocline, a thin shear flow layer located at the base of the convection envelope, that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle. some results of a new nonlinear three - dimensional solar dynamo model are also presented
許多行星（如木衛三，水星，地球，木星和土星）和恆星（如太陽）具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恆星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生並維持在行星和恆星中的磁場.在行星中磁流體力學過程強烈地受到轉動，磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線，即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色，並由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型The deep observations have also traced the waxing and waning of star formation in the universe at large over cosmic time
回溯宇宙年代的深度觀測，同時也追蹤了整個宇宙恆星形成率的變化。Unlike the eclipsing variables that are related to geometry, some variable stars are variables because of their intrinsic structure
：和食變星不同的是，有些恆星的光度變化是內部因素所造成的。Of course, the next big step for chinese space astronomy would be to deploy a satellite dedicated only for astronomical research. there are currently a few projects in the planning stage, including a hard x - ray all - sky survey satellite the hard x - ray modulation telescope mission, and a " microsatellite " weight less than 100 kg mission to study long - term variability of stars and galaxies space - based multi - band variable objects monitor
當然，下一步首先應是發射專門用作天文研究的衛星，目前有幾個計劃正處于策劃階段，包括建造一枚作硬x射線巡天觀測的衛星硬x射線調制望遠鏡， hxmt和一枚微型衛星重量不逾100公斤，來研究恆星和星系的長期變化空間變源監視器， svom 。From these minuscule shifts, the team estimated that the planet is about three times the mass of jupiter, and orbits its star at a distance slightly greater than that between mars and the sun
從這些極小的變化中，他所在的工作小組估測這顆行星的質量是木星的三倍，它的軌道距離恆星的距離比火星到太陽的距離略長。Clouds of stars and glowing gas, with patches of darkening dust, mark the slow - changing spiral patterns of the galaxy disk
點綴著暗淡塵埃的團團恆星和發光星雲，標記著銀河系緩慢變化的旋渦外形。Pulsating variables are stars that are continuously expanding and contracting and therefore show variations in brightness
例如脈動變星就是恆星本身不斷膨脹收縮，造成光度亦出現相應的變化。Because gravity in these systems is not a fixed external force but a product of the stars themselves, waves can be self - reinforcing
在這些系統中，重力並非恆定不變的外力，而是恆星自身的產物，波動可自我強化。As the star strips down to its still hot core, it evolves from orange to yellow, then white, and finally blue
當恆星崩解至它熾熱的核心時，將會呈現一連串的顏色變化，由橙轉黃、變白終至藍色。There are several types of variable stars. the graph showing the variation of brightness with respect to time is called the
變星種類繁多，科學家通常會用圖來顯示恆星亮度隨時間的變化，這種圖稱為Finally, as laurence a. marschall reports in planetary prospecting, a clever program to hunt for periodic changes in the spectra of stars has confirmed the existence of numerous giant planets orbiting stars beyond our solar system
最後，正如勞倫斯?瑪舍爾在《行星勘探卜書中所說，一個搜尋恆星光譜周期變化的聰明計劃證實在太陽系之外有無數個大行星圍繞著恆星在做軌道運行。These changes ( the result of the doppler effect ? familiar when a siren changes pitch as a fire engine passes by ) are much easier to detect than the wobbles themselves, and researchers can thus plot them out as a curve
這些變化是都普勒效應的結果? ?更習慣的說法是當一輛消防車經過時警報聲的變化，它們比恆星的位置移動更容易被探測到，而且研究人員能通過曲線圖的方式測定它們的具體位置。分享友人