Sigma Orionis - Wikipedia
Sigma Orionis or Sigma Ori (σ Orionis, σ Ori) is a multiple star system in the constellation Orion, consisting of the brightest members of a young open cluster. It is found at the eastern end of the belt, south west of Alnitak and west of the Horsehead Nebula which it partially illuminates.
參宿增一 - 维基百科，自由的百科全书
参宿增一 (Sigma Orionis)或Sigma Ori (σ Orionis, σ Ori)是在獵戶座內距離地球大約1150光年的一個五合星系統。 主要的成員是 聯星 的参宿增一A和参宿增一B，這兩顆星相距0.25弧秒。
参宿增一 - 百度百科
参宿增一，即猎户座σ〖Sigma Orionis〗是在猎户座内距离地球大约1150光年的一个五合星系统，位于参宿一西南方。 这个系统的综合视星等为+3.66，其中视星等为+4.22等的A星是一颗罕见的O型星。
Fine structure in the Sigma Orionis cluster revealed by Gaia DR3 ...
2024年6月7日 · Sigma Orionis is an open cluster in the nearest giant star formation site – Orion. Its youth (3−5 Myr), low reddening, and relative vicinity make it an important benchmark cluster to study stellar and substellar formation and evolution. Aims. Young star-forming sites are complex and hierarchical.
A New Look at Disk Winds and External Photoevaporation in the
5 天之前 · The $\sigma$-Orionis cluster is the ideal site to study disk winds under these conditions; its outer parts can be used to study disk evolution, while its innermost regions to study the effect of external irradiation. For this, we analyze the $\rm [OI]\,\lambda$6300, $\rm [NII]\,\lambda$6583, and $\rm [SII]\,\lambda$6731,$\lambda$6716 lines ...
Orion's Splendid Double Stars - Sky & Telescope
2006年7月26日 · Sigma (s) Orionis is an amazing multiple-star system. Most amateur instruments will reveal a beautiful quadruple. Instead of a box-shaped configuration like the Trapezium, Sigma’s components are strung out in an irregular line with the …
Fine structure in the Sigma Orionis cluster revealed by Gaia DR3
2024年4月25日 · Sigma Orionis is an open cluster in the nearest giant star formation site - Orion. Its youth (3-5 Myr), low reddening, and relative vicinity make it an important benchmark cluster to study stellar and substellar formation and evolution. …
Fine structure in the Sigma Orionis cluster revealed by
2024年6月7日 · Sigma Orionis is an open cluster in the nearest giant star formation site – Orion. Its youth (3−5 Myr), low reddening, and relative vicinity make it an important benchmark cluster to study stellar and substellar formation and evolution. Aims. Young star-forming sites are complex and hierarchical.
σ Orionis (sigma Orionis) - Star in Orion | TheSkyLive.com
σ Orionis is a multiple main-sequence star of spectral class O9 in the constellation of Orion. σ Orionis visual magnitude is 3.81. Because of its moderate brightness, σ Orionis is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.
Discovery of Young, Isolated Planetary Mass Objects in the σ Orionis ...
2000年10月6日 · With the objective of finding isolated planetary mass objects, we carried out a deep photometric survey in the optical and near-infrared wavelengths over an area of 847 arc min 2 around the multiple O9.5-type star σ Orionis (Fig. 1).