« previous next »

Author Question: What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and ... (Read 83 times)

ishan

  • Hero Member
  • *****
  • Posts: 546
on: Jul 27, 2018
What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
 
  A) R Coronae Borealis
  B) RR Lyrae
  C) Cepheid
  D) T Tauri
  E) Herbig-Haro

Question 2

What information about an astronomical object can be determined by observing its spectrum?
 
  A) its temperature
  B) its radial motion
  C) its chemical composition
  D) whether it has a strong magnetic field
  E) All of the above


chreslie

  • Sr. Member
  • ****
  • Posts: 307
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

E


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Binary Stars Binary Stars
Post–Main-Sequence Evolution of Low-Mass Stars Post–Main-Sequence Evolution of Low-Mass Stars
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Variable Gases: Carbon Dioxide Variable Gases: Carbon Dioxide
Main arteries of the arm Main arteries of the arm
Identify the variable representing each described quantity in the equation Identify the variable representing each described quantity in the equation
Video: Pressure volume relationships - Normal inspiration and expiration

For a complete list of videos, visit our video library