What Happens in the Bar of a Barred Spiral

question 125

Multiple Choice

What happens in the bar of a barred spiral?

• A) The bar rotates like a rigid body with no relative motion of the stars and gas inside.
• B) The bar is part of the spiral arm structure, and it is actually a shock wave moving through the relatively rapid circular motion of the individual stars.
• C) Stars tend to enter one end of the bar, pass through the bar, and exit the other end.
• D) Stars and gas tend to move along highly elliptical orbits within the bars.

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