Properties of Stars and H-R Diagrams
Temperature of Stars
Very Hot (20,000 K) 7,000 K 5,000 K Cool (2500 K)
Brightness of Stars
_____________ is how we measure brightness.
Apparent magnitude – a star’s brightness as it appears from Earth.
Stars ____________ to Earth will appear _________________ only
because they are closer to us. (We use size, its temperature, and its
distance from Earth to determine brightness.)
Absolute magnitude – a star’s __________l brightness (with no
regard for its distance from the Earth) in comparison with other stars.
HR diagrams compares a star’s surface ______________ and _______________ magnitude. It
is used to study the ________ of star. Most stars lie along the _______________________ portion
of the diagram (meaning most stars are in the _______________________ stage)
Key Points of H-R Diagrams
Hottest Stars are the ___________________ stars. Coolest stars are the ______________.
_____________ stars have more mass. _______________stars have less mass. Cooler stars have
live ___________ than hot stars.
What does apparent and actual magnitude
How can you tell temperature by color?
From cold to hot: ___________________________
On the HR diagram, what stage are most stars in?
What elements are made in the following stages:
Main sequence: _________________________
Red Giant: _____________________________
Supergiant : ____________________________
Supernova : ____________________________