Astron 104 Laboratory #9 Cepheid Variable Stars
... • The apparent magnitude of the star, which is a measure of how much light we receive on Earth (i.e., how bright do we measure the star to be). • The absolute magnitude of the star, which is a measure of how much light it is actually radiating into space (i.e, how bright it actually is). • The star’ ...
... • The apparent magnitude of the star, which is a measure of how much light we receive on Earth (i.e., how bright do we measure the star to be). • The absolute magnitude of the star, which is a measure of how much light it is actually radiating into space (i.e, how bright it actually is). • The star’ ...
The Night Sky
... Every August, the night sky produces its own version of fireworks, the Perseid meteor shower. This meteor shower is a summertime classic and among the oldest and most publicized of all such showers. Astronomers have determined that comet Swift-Tuttle is the source of the Perseid shower as once every ...
... Every August, the night sky produces its own version of fireworks, the Perseid meteor shower. This meteor shower is a summertime classic and among the oldest and most publicized of all such showers. Astronomers have determined that comet Swift-Tuttle is the source of the Perseid shower as once every ...
chapter17StarStuff
... • High-mass stars with >8MSun have short lives, eventually becoming hot enough to make iron, and end in supernova explosions • Low-mass stars with <2MSun have long lives, never become hot enough to fuse carbon nuclei, and end as white dwarfs • Intermediate mass stars can make elements heavier than c ...
... • High-mass stars with >8MSun have short lives, eventually becoming hot enough to make iron, and end in supernova explosions • Low-mass stars with <2MSun have long lives, never become hot enough to fuse carbon nuclei, and end as white dwarfs • Intermediate mass stars can make elements heavier than c ...
Lectures 14 & 15 powerpoint (neutron stars & black holes)
... 4.3 and 3.9 Earth masses! Further analysis revealed a third planet with a mass of about that of our moon! And there is evidence that a fourth planet about 100 Earth masses orbits this pulsar with a much larger separation. Q: How can a NS have planets?!? (Recall that NS are created by supernovae, and ...
... 4.3 and 3.9 Earth masses! Further analysis revealed a third planet with a mass of about that of our moon! And there is evidence that a fourth planet about 100 Earth masses orbits this pulsar with a much larger separation. Q: How can a NS have planets?!? (Recall that NS are created by supernovae, and ...
Galaxy Formation and Evolution Open Problems
... Stellar Halo • 109 old and metal poor stars (Pop.II) • 150 globular clusters (13 Gyr) • <0.2% Galaxy mass, 2% of the light •Dark Halo ...
... Stellar Halo • 109 old and metal poor stars (Pop.II) • 150 globular clusters (13 Gyr) • <0.2% Galaxy mass, 2% of the light •Dark Halo ...
Low mass stars
... Nearby stars: main-sequence appears. Most stars are less luminous and cooler than the Sun (alpha Centauri, nearest to us and a triple system, is similar). Note the hot small stars: the white dwarfs. ...
... Nearby stars: main-sequence appears. Most stars are less luminous and cooler than the Sun (alpha Centauri, nearest to us and a triple system, is similar). Note the hot small stars: the white dwarfs. ...
Constellation Detection
... before we can use it as a template and quantify the template as data structures for further detection. First, Every single template image is first binarized. We pick different colors to efficiently distinguish stars and connection lines (stars are represented by red and connection lines is represent ...
... before we can use it as a template and quantify the template as data structures for further detection. First, Every single template image is first binarized. We pick different colors to efficiently distinguish stars and connection lines (stars are represented by red and connection lines is represent ...
Multiple Choice, continued
... come from Latin. • Some constellations are named for real or imaginary animals, such as Ursa Major (the great bear) or ancient gods or legendary heroes, such as Hercules or Orion. ...
... come from Latin. • Some constellations are named for real or imaginary animals, such as Ursa Major (the great bear) or ancient gods or legendary heroes, such as Hercules or Orion. ...
PPS
... colours as O, B, A, F, G and M in decreasing order of the temperature. O stars, at one extreme of the classification, are blue-white and show features due to ionized helium in their spectra; G stars, which are much cooler and orange-yellow in colour, show strong lines associated with ionized calcium ...
... colours as O, B, A, F, G and M in decreasing order of the temperature. O stars, at one extreme of the classification, are blue-white and show features due to ionized helium in their spectra; G stars, which are much cooler and orange-yellow in colour, show strong lines associated with ionized calcium ...
Wide-eyed Telescope Finds its First Transiting
... Embargoed until Tuesday 26th September 00:02 a.m. BST=GMT+1hr The SuperWASP planetary transit telescopes The SuperWASP (Wide Angle Search for Planets) project operates two camera systems – one in La Palma in the Canary Islands and one at Sutherland Observatory, South Africa. These telescopes have a ...
... Embargoed until Tuesday 26th September 00:02 a.m. BST=GMT+1hr The SuperWASP planetary transit telescopes The SuperWASP (Wide Angle Search for Planets) project operates two camera systems – one in La Palma in the Canary Islands and one at Sutherland Observatory, South Africa. These telescopes have a ...
Wide-eyed Telescope Finds its First Transiting
... Embargoed until Tuesday 26th September 00:02 a.m. BST=GMT+1hr The SuperWASP planetary transit telescopes The SuperWASP (Wide Angle Search for Planets) project operates two camera systems – one in La Palma in the Canary Islands and one at Sutherland Observatory, South Africa. These telescopes have a ...
... Embargoed until Tuesday 26th September 00:02 a.m. BST=GMT+1hr The SuperWASP planetary transit telescopes The SuperWASP (Wide Angle Search for Planets) project operates two camera systems – one in La Palma in the Canary Islands and one at Sutherland Observatory, South Africa. These telescopes have a ...
Section 2
... in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In ancient China, this group of stars was called “three,” probably ...
... in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In ancient China, this group of stars was called “three,” probably ...
Stars and Planets - The University of Texas at Dallas
... In the 1920’s Edwin Hubble not only showed that many “nebula” were in fact other galaxies, but that galaxies appear to be speeding away from one another. The further away a galaxy was (measured with standard candles), the faster it seemed to move away from us! velocity = Ho x distance, where Ho is a ...
... In the 1920’s Edwin Hubble not only showed that many “nebula” were in fact other galaxies, but that galaxies appear to be speeding away from one another. The further away a galaxy was (measured with standard candles), the faster it seemed to move away from us! velocity = Ho x distance, where Ho is a ...
aaswinter06
... • The detailed light curve is unlike that of a supernova, nova, or any other type of variable star (1,2,3). During the outburst, V838 Mon was found to have a maximum effective temperature of an A – F star at the optical maximum in February 2002. The effective temperature then cooled to a very low ~8 ...
... • The detailed light curve is unlike that of a supernova, nova, or any other type of variable star (1,2,3). During the outburst, V838 Mon was found to have a maximum effective temperature of an A – F star at the optical maximum in February 2002. The effective temperature then cooled to a very low ~8 ...
Oscillating White Dwarf Stars Background on White Dwarfs
... ZZ Ceti Stars – Driving Mechanism • In 1981 Don Winget, for his Ph.D. thesis found the driving mechanism. Hydrogen in the outer envelope recombines from the ionized state at an effective temperature of ~12000 K. Hydrogen in going from ionized to neutral state increases its opacity. So, this is the ...
... ZZ Ceti Stars – Driving Mechanism • In 1981 Don Winget, for his Ph.D. thesis found the driving mechanism. Hydrogen in the outer envelope recombines from the ionized state at an effective temperature of ~12000 K. Hydrogen in going from ionized to neutral state increases its opacity. So, this is the ...
Spectra PowerPoint
... • The temperature at which the lines reach maximum strength is different for each type of atom or molecule. ...
... • The temperature at which the lines reach maximum strength is different for each type of atom or molecule. ...
Here
... gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the viewing angle, then you can compute true orbital velocities and use Kepler’s Laws and Newton’s theory to find the actual ...
... gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the viewing angle, then you can compute true orbital velocities and use Kepler’s Laws and Newton’s theory to find the actual ...
The Sky Tonight - Northern Stars Planetarium
... sky are actually double or multiple star systems, but their distance from us makes them look like one star to the unaided eye. Circumpolar Constellations: Constellations that are visible through the entire year. Located in the north, they circle around the North Star. For New England, they include t ...
... sky are actually double or multiple star systems, but their distance from us makes them look like one star to the unaided eye. Circumpolar Constellations: Constellations that are visible through the entire year. Located in the north, they circle around the North Star. For New England, they include t ...
Document
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
what`s up this month – april 2017
... the middle ages the Virgin was often associated with the Virgin Mary. Spica is the brightest star in the constellation of Virgo and the 16 th brightest star in the night sky. Analysis of its parallax shows that it is located 250 light years from the Sun. It is a spectroscopic binary and rotating ell ...
... the middle ages the Virgin was often associated with the Virgin Mary. Spica is the brightest star in the constellation of Virgo and the 16 th brightest star in the night sky. Analysis of its parallax shows that it is located 250 light years from the Sun. It is a spectroscopic binary and rotating ell ...
Chapter 16 Lives of the Stars (Low Mass)
... fusion of He is starting, temperature increases more and more. • Fusion rate skyrockets due to higher temperature (more collision between He): this is called the Helium Flash as it happens in a matter of seconds ! • The Helium flash marks the end of the red giant phase: finally, as core temperature ...
... fusion of He is starting, temperature increases more and more. • Fusion rate skyrockets due to higher temperature (more collision between He): this is called the Helium Flash as it happens in a matter of seconds ! • The Helium flash marks the end of the red giant phase: finally, as core temperature ...
In This Issue The Hottest Planet in the Solar System President`s Article
... degrees. But if our world were completely airless, like Mercury, we'd have day-to-night temperature swings that were hundreds of degrees. Additionally, our average surface temperature would be significantly colder, at around 0 °F (-18 °C), as our atmosphere functions like a blanket: trapping a porti ...
... degrees. But if our world were completely airless, like Mercury, we'd have day-to-night temperature swings that were hundreds of degrees. Additionally, our average surface temperature would be significantly colder, at around 0 °F (-18 °C), as our atmosphere functions like a blanket: trapping a porti ...
Introduction
... cross-correlation function was firstly applied to astronomy by Simkin (1974). The spectrograph behavior has also to be kept under control, to achieve the required precisions, and a radial-velocity reference serves to accomplish this. There are currently two different techniques to establish this ref ...
... cross-correlation function was firstly applied to astronomy by Simkin (1974). The spectrograph behavior has also to be kept under control, to achieve the required precisions, and a radial-velocity reference serves to accomplish this. There are currently two different techniques to establish this ref ...
Giant Stars
... •At 100 million K, three Heliums can join to make carbon plus a little energy 3He C + Energy •With a little higher temperature, they can add one more to make oxygen C + He O + Energy •These processes produce far less energy than hydrogen burning ...
... •At 100 million K, three Heliums can join to make carbon plus a little energy 3He C + Energy •With a little higher temperature, they can add one more to make oxygen C + He O + Energy •These processes produce far less energy than hydrogen burning ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.