3.85 3.90 3.95 4.00 Choose the three answers below which are the best answers for the following questions: 4.05 4.10 4.15 0.4 0.5 0.6 0.7 0.8 0.9 0.0 0.1 0.2 0.3 Phase The light curve for a variable star is shown in the figure to the right. a) Identify the type of variable star and explain your criteria for classifying it as such, b) estimate the depth of the primary (deeper) eclipse, and c) describe what you can conclude about the period of the variable from looking at the light curve. O None of the magnitudes listed equals the value of the magnitude of the light curve. O This is an intrinsic variable star since it actually pulsates - the radus rhythmically expands and shrinks - much like breathing. O The period is long compared to the other variable stars. O This is an extrinsic vaiable system. A pair of gravitationally bound stars eclipsing each other. O The depth of the primary eclipse is about 0.315 magnitudes O The period is twice the time between the primary and secondary eclipses. O The depth of the primary eclipse is about 4.19 magnitudes O I can not conclude anything about the period from this curve. Absolute Visual Magnitude
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
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