Stars
What color star is generally the hottest?
Blue
What letter is the hottest class and what letter is the coldest class?
O is the hottest
M is the coldest
What type of binary stars only appear to be close together in the sky but are in fact at different distances?
Optical doubles
Kelvin (K)
The __________ ___________ (2 words) of a star is the apparent magnitude that a star would have if it were placed 10 parsecs away from the observer
absolute magnitude
What is the main gas in stars?
Hydrogen
For the magnitude system, a lower number means?
lower number means a brighter star
What type of true binary stars can be separated by a telescope?
Visual binaries
What is the word for amount of light stars emit?
Luminosity
What is the instrument called that can detect the presence or absence of waves of color light?
Spectroscope
According to the video, what is the birth place of a star?
Nebuli, clouds of dust and gas
Hertzprung and Russell plotted these two relationships against each other
Star luminosity and temperature
What type of binaries cannot be separated but show a change in brightness as one star passes in front of the other?
Eclipsing binaries
What is the chemical reaction called that happens in stars and what does it create?
Thermonuclear fusion (or nuclear fusion or fusion).
it creates heat and energy
The smallest type of star in a given class is called what?
a main sequence star
What did the video call 'baby stars'?
Protostars
Main sequence stars
Name one set of binary stars that the book mentioned
Albireo, Almaak, Mizar, Alpha Centauri, Acrux, Epsilon Lyrae, Regulus, Cor Coroli, Alpha Capricorni, Sirius
What percentage of stars are main sequence stars?
90%
What is the full classification of the sun (should be 3 letters/numbers)
G2V
According to the video, what do stars become when they die? (name at least 2)
a white dwarf surrounded by a planetary nebula
more massive stars become a neutron star in a bright supernova
the most massive stars become blackholes
Super giants are found on this area of the HR diagram
the upper right
Epsilon Lyrae is actually how many stars and what is this called?
4. it is a double-double
Name the letters of the seven classes of stars based on temperature, which is indicated by color, from hottest to coldest.
OBAFGKM
What does it mean that the sun is a G2V? (what do each of those mean?)
G - is slightly cooler than average
2 - is ranked 2 out of 9 for temperature of G stars
V - it is the smallest of the G2 stars