Week 1 Flashcards
(42 cards)
What are the subdivisions of the angles that are measured in degrees?
1* = 60’ = 3600’’
1 radian is equal to?
180*/pi = 206265’’
What is intrinsic luminosity?
Total energy emitter per unit time
What is the equation for parallax method?
Tan p = 1AU/d if p is very small then p= 1AU/d
Parallax equation in terms of parsecs?
p(Arcsec) = 1/d(pc)
What is flux?
Amount of energy being received per unit area per unit time
Flux and intrinsic luminosity are related by?
F=L/4pid^2
What stars are brighter, ones with lower or higher magnitude?
Stars with lower apparent magnitude are brighter than stars with higher apparent magnitudes
What is the absolute magnitude (M)?
Defined to be the apparent
Magnitude that a str would have if placed at a distance of 10parsecs from the Earth
Which stars are hotter blue or red?
Blue stars are hotter than red stars
What is the sensitivity range for UV?
300-400nm
What is the range for blue?
350-550nm
What range is visual?
480-650nm
What is the effective temperature?
Defined to be the temperature that a str with biometric luminosity would have if it were a perfect black body.
What are the subdivisions of the angles that are measured in degrees?
1* = 60’ = 3600’’
1 radian is equal to?
180*/pi = 206265’’
What is intrinsic luminosity?
Total energy emitter per unit time
What is the equation for parallax method?
Tan p = 1AU/d if p is very small then p= 1AU/d
Parallax equation in terms of parsecs?
p(Arcsec) = 1/d(pc)
What is flux?
Amount of energy being received per unit area per unit time
Flux and intrinsic luminosity are related by?
F=L/4pid^2
What stars are brighter, ones with lower or higher magnitude?
Stars with lower apparent magnitude are brighter than stars with higher apparent magnitudes
What is the absolute magnitude (M)?
Defined to be the apparent
Magnitude that a str would have if placed at a distance of 10parsecs from the Earth
Which stars are hotter blue or red?
Blue stars are hotter than red stars
