Lecture 1 – Astronomy
... Netherlands that could bring far objects to appear closer. An optician had made the first telescope. Galileo bought some lenses from his local optician and build his own telescope. When he pointed the telescope towards the Sun in 1610, he noticed dark spots on the surface. He studied the spots over ...
... Netherlands that could bring far objects to appear closer. An optician had made the first telescope. Galileo bought some lenses from his local optician and build his own telescope. When he pointed the telescope towards the Sun in 1610, he noticed dark spots on the surface. He studied the spots over ...
General Astronomy - Stockton University
... At this point in time, the ‘jury is still out’ and we really don’t know if Barnard’s Star was the first discovery of extra-solar planets. ...
... At this point in time, the ‘jury is still out’ and we really don’t know if Barnard’s Star was the first discovery of extra-solar planets. ...
1. Introduction
... In parallel with these developments, it has come to be realized that some, and probably very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in a ...
... In parallel with these developments, it has come to be realized that some, and probably very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in a ...
Astrophysics notes - School
... Magnitude and Intensity Magnitude is a measure of how bright a star is. There are, however, two different ways of indicating a stars magnitude; apparent magnitude and absolute magnitude. The scale we use to measure magnitude is based on that created by the ancient Greeks which ran from 1 to 6. On th ...
... Magnitude and Intensity Magnitude is a measure of how bright a star is. There are, however, two different ways of indicating a stars magnitude; apparent magnitude and absolute magnitude. The scale we use to measure magnitude is based on that created by the ancient Greeks which ran from 1 to 6. On th ...
SUMMARY White dwarfs, neutron stars, and black holes are the
... in an accretion disk. What type of photons have this wavelength? 10. (15.1–15.3) You observe a main sequence K0type star that moves as if it is in a binary system, but no companion is visible. If the period of the system is 34 days and the semimajor axis is 0.5 AU, what is the mass of the system (r ...
... in an accretion disk. What type of photons have this wavelength? 10. (15.1–15.3) You observe a main sequence K0type star that moves as if it is in a binary system, but no companion is visible. If the period of the system is 34 days and the semimajor axis is 0.5 AU, what is the mass of the system (r ...
Deducing Temperatures and Luminosities of Stars
... • Sum of all light emitted over all wavelengths is the luminosity – brightness per unit surface area – luminosity is proportional to T4: L = T4 Joules ...
... • Sum of all light emitted over all wavelengths is the luminosity – brightness per unit surface area – luminosity is proportional to T4: L = T4 Joules ...
cifutielu`s Astronomy Test 2014
... Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of the Sun’s mass. 3. _____ Giants/supergiants whose periods range from 20 to 2000 days. 4. _ ...
... Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of the Sun’s mass. 3. _____ Giants/supergiants whose periods range from 20 to 2000 days. 4. _ ...
Colour-magnitude diagram of an open cluster
... that is 10× more massive than the Sun will only live for about 10 million years! The point where the main sequence ends (the main sequence turn-off ) is thus a good indicator of the age of a star cluster. In the Hyades, the main sequence turn-off is at MV ≈ +2. Stars above this point have used up al ...
... that is 10× more massive than the Sun will only live for about 10 million years! The point where the main sequence ends (the main sequence turn-off ) is thus a good indicator of the age of a star cluster. In the Hyades, the main sequence turn-off is at MV ≈ +2. Stars above this point have used up al ...
TAP 704- 8: The ladder of astronomical distances
... The prestigious meeting of the International Astronomical Union in 1976 was startled to be told that the Universe is only half as big as the astronomers present all thought, and therefore only half as old. The challenger was the French-American astronomer Gerard de Vaucouleurs; the leader of the cha ...
... The prestigious meeting of the International Astronomical Union in 1976 was startled to be told that the Universe is only half as big as the astronomers present all thought, and therefore only half as old. The challenger was the French-American astronomer Gerard de Vaucouleurs; the leader of the cha ...
The Science of Astronomy - Ohio Wesleyan University
... stargazing session on a clear evening (no special equipment necessary!) • Where celestial objects are in the sky depend on the time and the location ...
... stargazing session on a clear evening (no special equipment necessary!) • Where celestial objects are in the sky depend on the time and the location ...
Star formation, feedback and the role of SNe II and SNe Ia in the
... Dwarf spheroidals galaxies of the local group were originally thought to be very similar in their metallicity and star formation histories to the galactic globular clusters, but their star formation history is now known to be much more complex. ...
... Dwarf spheroidals galaxies of the local group were originally thought to be very similar in their metallicity and star formation histories to the galactic globular clusters, but their star formation history is now known to be much more complex. ...
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
... 2. What is a circumpolar star? 3. Define: Astronomical refraction. 4. Define Horizontal parallax. 5. State any one of Kepler’s laws of planetary motion. 6. What is Equation of time? 7. Define Synodic month. 8. What is meant by ‘phase of moon’? 9. What are inner planets? 10. Define ‘Stationary points ...
... 2. What is a circumpolar star? 3. Define: Astronomical refraction. 4. Define Horizontal parallax. 5. State any one of Kepler’s laws of planetary motion. 6. What is Equation of time? 7. Define Synodic month. 8. What is meant by ‘phase of moon’? 9. What are inner planets? 10. Define ‘Stationary points ...
Stellar Evolution: Evolution: Birth, Life, and Death of Stars
... Evolution of stars When we talk about stellar evolution we mean on changes that occur in stars as they consume "fuel" , since their birth through their long life, and until they die. Understanding the evolution of stars help astronomers to understand: - The nature and future fate of our Sun. - Th ...
... Evolution of stars When we talk about stellar evolution we mean on changes that occur in stars as they consume "fuel" , since their birth through their long life, and until they die. Understanding the evolution of stars help astronomers to understand: - The nature and future fate of our Sun. - Th ...
THE 3-D UNIVERSE CONCEPTS
... Our eyes alone cannot judge the distances to objects in space It is impossible to determine the distance to a star using your eyes alone. You are able to judge the distance to nearby objects because each eye views them from a different angle. Your brain combines these two perspectives to give you a ...
... Our eyes alone cannot judge the distances to objects in space It is impossible to determine the distance to a star using your eyes alone. You are able to judge the distance to nearby objects because each eye views them from a different angle. Your brain combines these two perspectives to give you a ...
White Dwarfs and Neutron Stars
... • Electron degeneracy cannot support a white dwarf heavier than 1.4 solar masses, the “Chandrasekhar limit”. ...
... • Electron degeneracy cannot support a white dwarf heavier than 1.4 solar masses, the “Chandrasekhar limit”. ...
White Dwarfs and Neutron Stars
... • Electron degeneracy cannot support a white dwarf heavier than 1.4 solar masses, the “Chandrasekhar limit”. ...
... • Electron degeneracy cannot support a white dwarf heavier than 1.4 solar masses, the “Chandrasekhar limit”. ...
1. a) Astronomers use the parallax method to measure
... 4. Fritz Zwicky measured the masses of clusters of galaxies. How did he do that (or in general how would an astronomer measure the mass of a cluster of galaxies)? Hint: we use almost the same method anytime we measure the masses of astronomical objects. What quantities would an astronomer have to m ...
... 4. Fritz Zwicky measured the masses of clusters of galaxies. How did he do that (or in general how would an astronomer measure the mass of a cluster of galaxies)? Hint: we use almost the same method anytime we measure the masses of astronomical objects. What quantities would an astronomer have to m ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.