Example: Isolating the Hyades Cluster
實例:單獨顯示畢宿星團
This example will show you how to use
star display options in Starry Night Pro
and Pro Plus to separate stars in the
Hyades cluster from other stars.
這個例子將教您如何使用Starry Night 專業版與專業增強版中顯示恆星的選項來把畢宿星團中的成員與其他恆星區別開
1 Turn off daylight and hide the horizon
by checking the appropriate boxes in the
Options pane (“Local View” layer).
1. 通過勾選Options側邊面板((“Local View”分層)中的相應方框來關閉日光效果與隱藏地平線
2 Ensure that the star database (in the
“Stars” layer of the Options pane) is
turned on, and the “Bright NGC Objects”
database (in the “Deep Space” layer) is
turned off. We need to do this because the
Hyades is an object in the “Bright NGC
Objects”
database
2. 確保恆星數據庫(位於Options側邊面板的“Stars”分層裡)為開啟狀態,同時“Bright NGC Objects”數據庫(在“Deep Space”分層裡)為關閉狀態,這是由於畢宿星團屬於“Bright NGC Objects”數據庫/星表中的天體
3 Open the Find pane and type in
“Epsilon Tauri”. This is a bright star in the
Hyades cluster. Double-click on this star’s
name to centre on the Hyades cluster.
3. 打開 Find 側邊面板,並且輸入關鍵字“Epsilon Tauri”,它是畢宿星團中的一顆亮星,通過在這顆星的名稱上雙擊來將畢宿星團定位到屏幕中心
4 Use the zoom buttons in the toolbar to
zoom in to a field of view of about 15°.
4. 使用工具條上的放大按鈕來縮小視場至15角度
5 Turn on proper motion vectors for stars,
using the checkbox in the Options pane
(“Stars” layer). Increase the length of
proper motion vectors to maximum, by
pulling the “Vector scaling” slider in the
“Proper Motion Vectors Options” dialog box
all the way to the right. You should see
that many of the stars have vectors
pointing in the same direction, indicating
that they are moving together through
space and are part of the same cluster.
However, many other stars, such as the
bright star Aldebaran, are moving in very
different directions.
5. 勾選Options側邊面板((“Stars”分層)中的"proper motion vectors "核取方框,來顯示恆星的自行矢量,然後在"proper motion vectors "名稱上單擊打開“Proper Motion Vectors Options”對話框,
通過一直拖動“Vector scaling”滑塊朝右側來增加自行矢量線段的長度達到最大值,您應該能看到絕大多數的恆星自行矢量指向同一方向,這表明它們正一起穿越空間移動並且屬於同一個星團
然而,有許多其餘的恆星,例如Aldebaran(畢宿五) 正朝完全不同的方向移動
6 Open the “Limit by Distance Options”
dialog box for stars. Check “Limit stars by
distance” and set the distance range from
140 to 170 light years, the distance of the
Hyades cluster. This will cause almost all
stars that do not belong to the cluster to
disappear, leaving only stars in the Hyades
cluster, all with proper motion vectors
pointing in the same direction. Those few
stars with vectors pointing in different
directions (likely not cluster members) are
now very easy to identify.
6. 在Stars 數據庫下面的“Limit by Distance Options”名稱上單擊打開對話框,勾選“Limit stars by distance”核取方框,然後把距離範圍設置成140~170光年,也就是畢宿星團與地球的距離
這將讓幾乎所有不屬於該星團的恆星(從屏幕上)消失 ,
只剩下畢宿星團中的恆星,並且帶有指向同一方向的自行矢量
那些少數自行方向不同的恆星(似乎不是該星團成員)此刻就非常容易辨認出來
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显身卡
僅限專業版與專業增強版)
