We present the results of modelling the energy distribution of a power law reflected by a dusty cloud. We explore in a fully consistent manner the case in which the reflecting nebula is of considerable optical depth. We apply the model to the observations of the detached emission line cloud ...
Reflection nebula: NGC 1999 Another type of diffuse nebula, a reflection nebula doesn’t emit its own light, but scatters light from embedded stars. (Image credit: NASA, JPL-Caltech, Kate Su (Steward Obs, U. Arizona) et al.) Planetary nebula: The Helix Nebula This is composed of expand...
1.21 NGC 1999 is a reflection nebula. It does not emit any visible light of its own but shines only because the light from the star just to the left of the center illuminates the nebula's dust. NG...
Interstellar extinction is investigated in a 1.5 square degree area in the direction of the reflection nebula NGC 7023 at l = 104.1 deg, b = +14.2 deg. The... K Zdanavicius,J Zdanavicius,V Straizys,... - Baltic Astronomy 被引量: 73发表: 2009年 Chandra ACIS Spectroscopy of N157B...
Giant Branch (AGB) phase, the star undergoes mass loss, emitting a circumstellar shell of hydrogen gas. When this phase comes to an end, the star enters the PPN phase, where it is energized by a central star, causing it to emit strong infrared radiation and become a reflection nebula. ...
NGC 2170 A Reflection Nebula in the Constellation Monoceros,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工
Messier 78 - A reflection nebula in the constellation Orion,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工
Next, we interpolate and extrapolateρandKT, and thus the bulk sound velocityVΦ, given a compositionx, over the entire Martian core along the aerotherm of ref.4. The effects of pressure and composition are described by equation (1) and a second-order Birch–Murnaghan EoS: ...
The Iris Nebula is a bright reflection nebula in the constellation Cepheus. It lies 1 300 light-years away and is six light-years across.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后