Today in Astronomy 142: observations of stars
... within some range of wavelengths. The flux at the surface of an emitting object is often called the surface brightness. Most stars, like many astronomical objects, emit light isotropically (same in all directions) ! Since the same total power L must pass through all spheres centered on a star, and i ...
... within some range of wavelengths. The flux at the surface of an emitting object is often called the surface brightness. Most stars, like many astronomical objects, emit light isotropically (same in all directions) ! Since the same total power L must pass through all spheres centered on a star, and i ...
Cosmological redshift
... Measuring the redshift z of a cluster of galaxies (say) should therefore enable us to find the distance d to it in Mpc, using the known values of Hubble's constant H0 = 71 km s-1 Mpc-1 and the velocity of light c = 3.00 x 105 km s-1. There is, however, something else to be taken into account. Galaxi ...
... Measuring the redshift z of a cluster of galaxies (say) should therefore enable us to find the distance d to it in Mpc, using the known values of Hubble's constant H0 = 71 km s-1 Mpc-1 and the velocity of light c = 3.00 x 105 km s-1. There is, however, something else to be taken into account. Galaxi ...
Chapter 10 Measuring the Stars: Giants, Dwarfs, and the Main
... * Some stars are supergiants and are also located near the top right (_______________) * White dwarfs are hot, faint, small stars near the bottom of the diagram • Some white dwarfs are Earth sized * Bright and near stars plotted on diagram Extending the Cosmic Distance Scale * Spectroscopic Parallax ...
... * Some stars are supergiants and are also located near the top right (_______________) * White dwarfs are hot, faint, small stars near the bottom of the diagram • Some white dwarfs are Earth sized * Bright and near stars plotted on diagram Extending the Cosmic Distance Scale * Spectroscopic Parallax ...
Astronomy 110G Review Sheet for Exam #3 The
... electrons into the protons to form neutrons. Resulting neutron stars (sometimes observed as pulsars) have neutrons packed as closely as possible, and are about 100,000 times smaller than the Sun. Above about 3 solar masses all remnants are black holes; even light cannot escape their strong surface g ...
... electrons into the protons to form neutrons. Resulting neutron stars (sometimes observed as pulsars) have neutrons packed as closely as possible, and are about 100,000 times smaller than the Sun. Above about 3 solar masses all remnants are black holes; even light cannot escape their strong surface g ...
PODSTAWY FIZYKI ŚRODOWISKA
... • The weak anthropic principle states that the universe must be compatible with our existence. • The strong anthropic principle states that the universe is such as it is because its purpose is to create life. ...
... • The weak anthropic principle states that the universe must be compatible with our existence. • The strong anthropic principle states that the universe is such as it is because its purpose is to create life. ...
Size & Distance Comparison (Powerpoint)
... Light travels from the Moon to Light takes just over 4 years to the Earth in just over a second reach us from the next star ...
... Light travels from the Moon to Light takes just over 4 years to the Earth in just over a second reach us from the next star ...
Document
... A healthy consciousness is like a spider’s web, and you are the spider in the centre. The centre of the web is the present moment. But the meaning of your life depends on those fine threads which stretch away to other times, other places, and the vibrations that come to you along the web…Normally, ...
... A healthy consciousness is like a spider’s web, and you are the spider in the centre. The centre of the web is the present moment. But the meaning of your life depends on those fine threads which stretch away to other times, other places, and the vibrations that come to you along the web…Normally, ...
the star
... structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy nowadays are the dwarf ellipticals. Gas used up long ago ma ...
... structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy nowadays are the dwarf ellipticals. Gas used up long ago ma ...
Chapter 14 The Milky Way Galaxy
... 14.2 Measuring the Milky Way This allows us to measure the distances to these stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillati ...
... 14.2 Measuring the Milky Way This allows us to measure the distances to these stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillati ...
Stars - Haag
... The brightness of stars from earth is known as its apparent magnitude. This depends on size and energy output ...
... The brightness of stars from earth is known as its apparent magnitude. This depends on size and energy output ...
Astronomical Toolkit
... stars. Some appear bright and others very faint as seen from Earth. Some of the faint stars are intrinsically very bright, but are very distant. Some of the brightest stars in the sky are very faint stars that just happen to lie very close to us. When observing, we are forced to stay on Earth or nea ...
... stars. Some appear bright and others very faint as seen from Earth. Some of the faint stars are intrinsically very bright, but are very distant. Some of the brightest stars in the sky are very faint stars that just happen to lie very close to us. When observing, we are forced to stay on Earth or nea ...
Eclipses, Distance, Parallax, Small Angle, and Magnitude (Professor
... orbits the Sun. The AU is most commonly used for the distances of objects with in our solar system. The Earth is 1.0 au from the sun, and Neptune is a distance of 30.06 au from the Sun. ...
... orbits the Sun. The AU is most commonly used for the distances of objects with in our solar system. The Earth is 1.0 au from the sun, and Neptune is a distance of 30.06 au from the Sun. ...
Lec12
... squeezed as they move into spiral arms 2. Squeezing of clouds triggers star formation 3. Young stars flow out of spiral arms ...
... squeezed as they move into spiral arms 2. Squeezing of clouds triggers star formation 3. Young stars flow out of spiral arms ...
Lesson 3: Calculating distances to stars
... Firstly we need to convert the parallax angle from arc seconds into degrees: Angle in degrees = (1/3600) × angle in arc seconds Angle in degrees = (1/3600) × 0.25 Angle in degrees = 6.9 × 10-4lllllllllll Next, we need to find the distance between the Earth and the star, the hypotenuse in the triangl ...
... Firstly we need to convert the parallax angle from arc seconds into degrees: Angle in degrees = (1/3600) × angle in arc seconds Angle in degrees = (1/3600) × 0.25 Angle in degrees = 6.9 × 10-4lllllllllll Next, we need to find the distance between the Earth and the star, the hypotenuse in the triangl ...
Slides from Lecture19 - Department of Physics & Astronomy
... • We have not always known that the diameter of our Galaxy is ~ 50 kpc (as illustrated in following slide) • For example, Herschel’s map of our Galaxy (1785) based on star counts … – Thin disk not much more than 1 kpc across – Sun approximately at center of disk ...
... • We have not always known that the diameter of our Galaxy is ~ 50 kpc (as illustrated in following slide) • For example, Herschel’s map of our Galaxy (1785) based on star counts … – Thin disk not much more than 1 kpc across – Sun approximately at center of disk ...
Solutions are availble in PDF format.
... thermal (blackbody) radiation, what can you conclude about the nature of these stars late in their life? You know from blackbody radiation that objects which are redder emit less energy per square meter— that is, if you have two objects which are of the same size, the redder one emits less energy pe ...
... thermal (blackbody) radiation, what can you conclude about the nature of these stars late in their life? You know from blackbody radiation that objects which are redder emit less energy per square meter— that is, if you have two objects which are of the same size, the redder one emits less energy pe ...
Hertzsprung-Russell Diagram, Flux, Luminosity, Magnitude—10 Oct Outline •
... 5700K • For a person, T=273+37=310K. 2.9mm K ...
... 5700K • For a person, T=273+37=310K. 2.9mm K ...
The Stars
... • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • What are red giants and white dwarf stars? • What is the mass-luminosity relationship? ...
... • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • What are red giants and white dwarf stars? • What is the mass-luminosity relationship? ...
Astronomical distances and space travel The purpose of this lab is to
... e. Place small pieces of tape at the appropriate spots as determined in b and d above to represent the Earth and Moon’s location on the hall’s floor. f. Question: At 20,000 miles/hour it took 3 days for the Apollo astronauts to travel to the Moon. Estimate how many days or years it would take to tra ...
... e. Place small pieces of tape at the appropriate spots as determined in b and d above to represent the Earth and Moon’s location on the hall’s floor. f. Question: At 20,000 miles/hour it took 3 days for the Apollo astronauts to travel to the Moon. Estimate how many days or years it would take to tra ...
Place the stars in the proper sequence, following the
... Along the main sequence, stars of greater magnitude are hotter (have more energy) c. How is a star’s luminosity related to its energy? For main-sequence stars, the luminosity increases with temperature. For the giants and super-giants, large (high magnitude) and luminous stars are actually quite coo ...
... Along the main sequence, stars of greater magnitude are hotter (have more energy) c. How is a star’s luminosity related to its energy? For main-sequence stars, the luminosity increases with temperature. For the giants and super-giants, large (high magnitude) and luminous stars are actually quite coo ...
space tech - Project Jugaad
... One of the first people to make a good measurement of the distance to a planet was the great astronomer Gian Domenico Cassini. In 1672, Cassini used a technique called parallax to measure the distance to Mars. You can understand parallax by holding your thumb up at arm's length and looking at it f ...
... One of the first people to make a good measurement of the distance to a planet was the great astronomer Gian Domenico Cassini. In 1672, Cassini used a technique called parallax to measure the distance to Mars. You can understand parallax by holding your thumb up at arm's length and looking at it f ...
Hertzsprung Russell diagram
... line in the diagram) and this is called the Main Sequence. Stars that lie in this area are called main sequence stars – the Sun is a main sequence star. In a way stars that lie on the main sequence are ‘normal’ stars while those that lie to one side or other of this area are ‘unusual’ stars – these ...
... line in the diagram) and this is called the Main Sequence. Stars that lie in this area are called main sequence stars – the Sun is a main sequence star. In a way stars that lie on the main sequence are ‘normal’ stars while those that lie to one side or other of this area are ‘unusual’ stars – these ...
Measuring Stars
... were related. Thus if a its period is known, its luminosity can be estimated . Cepheids are bright supergiant stars (~1000 times brighter than the Sun), so they can be identified even in other galaxies. ...
... were related. Thus if a its period is known, its luminosity can be estimated . Cepheids are bright supergiant stars (~1000 times brighter than the Sun), so they can be identified even in other galaxies. ...
Exam 3 Study Guide
... The M-sigma relationship allows one to use the stellar velocity dispersion of the bulge to measure the ______________. The theoretical upper limit for the mass of a super massive black hole is _______________. A quasar is a type of ______________. Blazars are AGN which are oriented such that _______ ...
... The M-sigma relationship allows one to use the stellar velocity dispersion of the bulge to measure the ______________. The theoretical upper limit for the mass of a super massive black hole is _______________. A quasar is a type of ______________. Blazars are AGN which are oriented such that _______ ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.