H-R diagram and spectra
What is the HR diagram?
A visual diagram of scattered stars that show the relationship between the stars ranked from top to bottom in order of decreasing magnitude and increasing temperature of a star.
what is the easiest constellation to see?
the big dipper/Ursa major
What is the Doppler effect?
The increase or decrease of frequency in sound/ light
Which stars are the hottest?
O stars
what is the scale for a stars brightness?
magnitude scale
where on the HR diagram can you find the luminosity and temperature of a star?
luminosity is plotted on the y-axis. and the temperature, on the x-axis.
what is a group of stars in the sky called?
A constellation.
what do scientists use the Doppler effect for?
They use this to measure and calculate the velocity of certain objects/ our stars. and how fast it is moving away or towards us.
how can you tell the temperature of a star by its color?
really hot stars are bright and blue colored, while colder stars are red.
What is stellar brightness?
how bright a star appears from earth
what stars on the HR diagram live the longest?
red dwarfs
what is the closest star to earth?
Our sun.
how can we use the Doppler effect to tell if a star has a planet orbiting it?
they use blue-shift red-shift to detect the movement and orbit of a star
how can you tell which life cycle a star is in?
A stars life cycle is determined by its mass. the larger its mass the shorter the life cycle. low mass stars are cooler and high mass stars are hotter and are white or blue white.
how do you read a magnitude scale of a star?
The brightest objects have the smallest numbers, and the faintest objects have the LARGEST numbers
what are the 7 spectral types of a star?
O,B,A,F,G,K,M
what causes us to be able to see different constellations throughout the year?
because of Earth's orbit around the sun.
true or false: As an object moves away from us its pitch/sound frequency goes down
true
High mass.
what magnitude of a star is brightest?
1st magnitude
why do stars produce different spectra?how do you use the spectra to classify which stars are hottest to coldest?
the differences in the spectra of stars are due to its different temperatures. the spectra of stars are put in a spectral class in order of decreasing temperature O,B,A,F,G,K,M O stars are the bright, hot, blue stars, and the M stars are the dimmer, cooler, red stars.
what is our largest constellation?
The Hydra.
true or false: The Doppler effect is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave
true
what is the natural color of stars?
they can range from a orangish, yellow, red color to a blue, deep blue, even white color.
what is the absolute magnitude?
a measure of how bright a star would be if it were seen from a standard distance.