Radius of a star as a function of wavelength

In summary, the radius of a star is not affected by the wavelength of light it emits. There is no direct relationship between the radius of a star and the wavelength of light it emits, but the temperature of a star does affect both its radius and emitted wavelength. The radius of a star can be measured using different wavelengths of light, with longer wavelengths providing more accurate measurements. The radius of a star changes as it ages due to changes in internal structure and temperature, which can be observed through different wavelengths. Measuring the radius of a star as a function of wavelength can provide valuable information about its internal structure, evolution, and physical processes, as well as help determine its distance from Earth and true size.
  • #1
natski
267
2
Hi all,

My question is, does the radius of a star vary significantly between different wavelengths? I am particularly interested in the 100 nm to 100 micron range. I found a paper by Paul Swanson on the radio band radius, but so far can find nothing which compares optical and infrared measurements.

Natski
 
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  • #2
In this wavelength range, most of the radiation comes from the photosphere, which I don't think would vary much in size as a function of wavelength
 

1. How does the radius of a star change with wavelength?

The radius of a star is not affected by the wavelength of light it emits. The radius of a star is determined by its mass, temperature, and chemical composition. These factors are independent of the wavelength of light. The apparent change in size of a star as observed from Earth is due to the different wavelengths of light being emitted from the star.

2. Is there a relationship between the radius of a star and the wavelength of light it emits?

No, there is no direct relationship between the radius of a star and the wavelength of light it emits. However, the temperature of a star does affect both its radius and the wavelength of light it emits. Generally, hotter stars have larger radii and emit shorter wavelengths of light.

3. Can the radius of a star be measured using different wavelengths of light?

Yes, the radius of a star can be measured using different wavelengths of light. However, the accuracy of the measurement may differ depending on the wavelength used. Longer wavelengths, such as infrared, can penetrate the outer layers of a star and provide a more accurate measurement of its radius.

4. How does the radius of a star change as it ages?

The radius of a star changes as it ages due to changes in its internal structure and temperature. As a star burns through its fuel, it will expand and its radius will increase. This is known as the red giant phase. After this phase, the star will contract and its radius will decrease, resulting in a white dwarf.

5. What is the significance of measuring the radius of a star as a function of wavelength?

Measuring the radius of a star as a function of wavelength can provide valuable information about its internal structure and evolution. It can also help us understand the physical processes happening within the star, such as energy generation and heat transfer. Additionally, comparing the radius of a star at different wavelengths can help us determine its distance from Earth and its true size.

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