Which of the following can astronomers determine from the spectrum of an object choose one or more?
From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.
What can we learn from starlight?
The light of stars is produced by atoms and molecules that encode, in the starlight itself, key science information about their chemical composition, temperature, pressure, and velocity.
Where is the sun in HR diagram?
The Sun is found on the main sequence with a luminosity of 1 and a temperature of around 5,400 Kelvin. Astronomers generally use the HR diagram to either summarise the evolution of stars, or to investigate the properties of a collection of stars.
How do you use an HR diagram?
In an H-R diagram the luminosity or energy output of a star is plotted on the vertical axis. This can be expressed as a ratio of the star’s luminosity to that of the Sun; L*/Lsun. Astronomers also use the historical concept of magnitude as a measure of a star’s luminosity.
What are most stars on the HR diagram classified as?
Most of the stars on the HR Diagram are classified as which type of star? Main Sequence – middle life 17. What type of star has a high temperature but a low luminosity?
Where is Proxima Centauri on the HR diagram?
At the bottom-right of the diagram we can see two named stars, Proxima Centauri and Barnard’s Star. These are both cool (approximately 2,500 K) and dim (absolute magnitudes of about 13, only about 1/10,000 the luminosity of our Sun).
How long would it take us to get to Proxima Centauri?
Travel Time It is traveling away from the Sun at a rate of 17.3 km/s. If Voyager were to travel to Proxima Centauri, at this rate, it would take over 73,000 years to arrive. If we could travel at the speed of light, an impossibility due to Special Relativity, it would still take 4.22 years to arrive!
Which star has the highest temperature?
Sirius