If you create a new RCP application a view gets a tab like this:

To remove the tab, use the “addStandaloneView” method in your perspective. Here is an example:
public class Perspective implements IPerspectiveFactory {
  public void createInitialLayout(IPageLayout layout) {       
    String editorArea = layout.getEditorArea();
    layout.setEditorAreaVisible(false);
    layout.addStandaloneView(View.ID, false, IPageLayout.LEFT, 1.0f, editorArea);       
  }
}
The result:

