Table of Contents
- 1 Why are hydrogen lines in some stars spectra stronger than in other stars spectra does it imply that there is more hydrogen in the atmosphere of some stars?
- 2 Why are Balmer lines weak in the spectra of hot stars Why are they also weak in cool stars?
- 3 Which color star is hottest?
- 4 What are the 7 spectral classes of stars?
- 5 Can a 500 solar mass star exist?
- 6 What color is the hottest star on the HR diagram?
Why are hydrogen lines in some stars spectra stronger than in other stars spectra does it imply that there is more hydrogen in the atmosphere of some stars?
In the atmospheres of the coolest stars, hydrogen atoms have their electrons attached and can switch energy levels to produce lines. The hydrogen lines in the visible part of the spectrum (called Balmer lines) are strongest in stars with intermediate temperatures—not too hot and not too cold.
Why are Balmer lines weak in the spectra of hot stars Why are they also weak in cool stars?
If the surface of a star is as cool as the surface of the Sun (about 5800 K) or cooler, most of the atoms are in the ground state. Again, there are very few hydrogen atoms with electrons in the second energy level, so the Balmer lines of these stars are weak.
Why are Balmer lines weaker in hotter and cooler stars?
-H (Balmer) lines are weak because they are ionized. -In hotter stars, the hydrogen is being ionized, and things are so hot there is so much collision of atoms, photons, etc., if you strip away an electron, there is nothing left to give you any absorption.
Why do cold stars have weak hydrogen lines Why do hot stars have weak hydrogen lines?
If the star is too hot or too cold, the hydrogen lines will be weak. If the temperature is too high, most of the hydrogen atoms will have their electrons starting out at higher energy levels. If the temperature is too low, most of the hydrogen atoms will have their electrons starting out from the ground state.
Which color star is hottest?
White stars are hotter than red and yellow. Blue stars are the hottest stars of all.
What are the 7 spectral classes of stars?
The stars are divided into 7 classes designated by the letters O, B, A, F, G, K, and M; the hottest stars (O and B) are blue-white in color, while the coolest (M) are red.
Which star has the strongest hydrogen Balmer series absorption lines?
For example, Balmer lines (lines from the first excited state of hydrogen atoms) are strong in A stars. O stars are too hot — all the hydrogen is ionized….Spectral Types.
What temperature has the strongest Balmer lines?
In stars, the Balmer lines are usually seen in absorption, and they are “strongest” in stars with a surface temperature of about 10,000 kelvins (spectral type A).
Can a 500 solar mass star exist?
Observations of giant star cluster suggest upper limit. If there were no limit to how big stars can grow, you’d expect ones up to 500 times our Sun’s mass to be found in this dense cluster of stars. But Figer found no stars larger than about 130 solar masses.
What color is the hottest star on the HR diagram?
Depending on the temperature of the matter at the star’s surface where the light last interacted (its “photosphere”) starlight will have a characteristic color. The hotter the star, the bluer its color.
What is the color of the coldest star?
The colour provides a fundamental piece of data in stellar astrophysics—the surface temperature of the star. The hottest stars are blue and the coldest are red, contrary to the use of colours in art and in our daily experience.
What classification of stars is the coolest?
M stars are the coldest stars and O stars are the hottest. The full system contains other types that are hard to find: W, R, N, and S. The closest star to the Earth, the sun, is a class G star.