Types of Galaxies - Spring Branch ISD
... b. The star’s distance from Earth 38. The Hertzsprung-Russell diagram shows the relationship between surface temperature and brightness 39. Look at the Hertzsprung-Russell diagram in Figure 11 on page 289. Write what is measured on each of the two axes of the diagram. a. x-axis (horizontal axis): Su ...
... b. The star’s distance from Earth 38. The Hertzsprung-Russell diagram shows the relationship between surface temperature and brightness 39. Look at the Hertzsprung-Russell diagram in Figure 11 on page 289. Write what is measured on each of the two axes of the diagram. a. x-axis (horizontal axis): Su ...
Astronomy Study Guide
... b. The star’s distance from Earth 38. The Hertzsprung-Russell diagram shows the relationship between surface temperature and brightness 39. Look at the Hertzsprung-Russell diagram in Figure 11 on page 289. Write what is measured on each of the two axes of the diagram. a. x-axis (horizontal axis): Su ...
... b. The star’s distance from Earth 38. The Hertzsprung-Russell diagram shows the relationship between surface temperature and brightness 39. Look at the Hertzsprung-Russell diagram in Figure 11 on page 289. Write what is measured on each of the two axes of the diagram. a. x-axis (horizontal axis): Su ...
Northern and Southern Hemisphere Star Chart
... the process until eventually all the star’s outer layers have been blown away into space. The tiny shrunken core, about the size of the Earth, remains as a white dwarf. White dwarf stars no longer produce light by nuclear fusion, merely continuing to glow like dying embers until they have slowly coo ...
... the process until eventually all the star’s outer layers have been blown away into space. The tiny shrunken core, about the size of the Earth, remains as a white dwarf. White dwarf stars no longer produce light by nuclear fusion, merely continuing to glow like dying embers until they have slowly coo ...
Galaxy1
... stars in the sky. This is because they have extremely large luminosity. They can be readily seen at great distances. • The stars in our little volume of the Galaxy are almost completely, low mass stars. • This means if we increased the volume that we are using to search for stars, we would start to ...
... stars in the sky. This is because they have extremely large luminosity. They can be readily seen at great distances. • The stars in our little volume of the Galaxy are almost completely, low mass stars. • This means if we increased the volume that we are using to search for stars, we would start to ...
Basics – II. Time, Magnitudes and Spectral types
... To avoid the complications of using calendars, we prefer to use, for many purposes, the Julian Day Number – or Julian Day. This was devised by Josephus Scaliger (1540–1609) and probably named to honour his father, Julius Scaliger. The Julian Day count starts on 4713 BC January 1st at 12h GMT. This “ ...
... To avoid the complications of using calendars, we prefer to use, for many purposes, the Julian Day Number – or Julian Day. This was devised by Josephus Scaliger (1540–1609) and probably named to honour his father, Julius Scaliger. The Julian Day count starts on 4713 BC January 1st at 12h GMT. This “ ...
1st EXAM VERSION C - Department of Physics and Astronomy
... A. The Giant stars are more luminous than the Sun. B. The Giant stars are larger than the Sun. C. *The Giant stars are hotter that the Sun D. The Giant stars have smaller absolute magnitude than the Sun 30. Which part of the Hertzsprung-Russell diagram is occupied by protostars? A. to the left of th ...
... A. The Giant stars are more luminous than the Sun. B. The Giant stars are larger than the Sun. C. *The Giant stars are hotter that the Sun D. The Giant stars have smaller absolute magnitude than the Sun 30. Which part of the Hertzsprung-Russell diagram is occupied by protostars? A. to the left of th ...
Proficiency Step #5--
... We tend to think of constellations as a group of related stars that form a pattern, when in fact, most of the constellations consist of stars that are not related—that is, they are varying distances from Earth and their relative positions are simply a coincidence. It might be convenient to note her ...
... We tend to think of constellations as a group of related stars that form a pattern, when in fact, most of the constellations consist of stars that are not related—that is, they are varying distances from Earth and their relative positions are simply a coincidence. It might be convenient to note her ...
The Star of Bethlehem: a Type Ia/Ic Supernova in the Andromeda
... do if indeed it rose just before dawn, as indicated above. But there is another possible astronomical meaning of the Greek phrase translated “in the east.” As pointed out by Hughes ([15] , p. 3) in his later book The Star of Bethlehem, the Greek en te anatole can also have the translation “acronycha ...
... do if indeed it rose just before dawn, as indicated above. But there is another possible astronomical meaning of the Greek phrase translated “in the east.” As pointed out by Hughes ([15] , p. 3) in his later book The Star of Bethlehem, the Greek en te anatole can also have the translation “acronycha ...
10.1 The Solar Neighborhood Barnard`s Star
... Nearest star to the Sun: Proxima Centauri, which is a member of a 3-star system: Alpha Centauri complex (3 stars orbiting each other) Model of distances: Sun is a marble, Earth is a grain of sand ...
... Nearest star to the Sun: Proxima Centauri, which is a member of a 3-star system: Alpha Centauri complex (3 stars orbiting each other) Model of distances: Sun is a marble, Earth is a grain of sand ...
Measuring Stars
... •Observe the star – determine it’s brightness B •Measure its spectral type from spectrum •Deduce its luminosity from the HertzsprungRussell Diagram •Find its distance from: L = 4d2B ...
... •Observe the star – determine it’s brightness B •Measure its spectral type from spectrum •Deduce its luminosity from the HertzsprungRussell Diagram •Find its distance from: L = 4d2B ...
9 Measuring the properties of stars - Journigan-wiki
... Most stars lie on the main sequence with the hotter stars being more luminous. Blue stars are hottest while red stars are the coolest A star’s mass determines its location along the main sequence with more massive stars located at the top. Stars masses range from about 30 solar masses to about 0.1 s ...
... Most stars lie on the main sequence with the hotter stars being more luminous. Blue stars are hottest while red stars are the coolest A star’s mass determines its location along the main sequence with more massive stars located at the top. Stars masses range from about 30 solar masses to about 0.1 s ...
May - Fort Worth Astronomical Society
... - RT Sextans varies over a 96 day period from magnitude 8.0 to 8.5 - S Sextans varies from magnitude 8.2 to 13.5 over a 261 day period. Double Stars The constellation also has two interesting double stars: − Σ1441, Σ1441 a close pair of orange and yellow stars, magnitudes 6.4 and 9.9 separated by 2. ...
... - RT Sextans varies over a 96 day period from magnitude 8.0 to 8.5 - S Sextans varies from magnitude 8.2 to 13.5 over a 261 day period. Double Stars The constellation also has two interesting double stars: − Σ1441, Σ1441 a close pair of orange and yellow stars, magnitudes 6.4 and 9.9 separated by 2. ...
Introduction to Galaxies and Cosmology Exercises 2
... the example above, what would its absolute magnitude and colour then be? 5. Assume that a galaxy is formed by gravitational collapse and that it contains a mass Mgas of gas. Also assume that half of this mass is converted into stars (M⋆ = 0.5Mgas ). a) The absolute bolometric magnitude for the galax ...
... the example above, what would its absolute magnitude and colour then be? 5. Assume that a galaxy is formed by gravitational collapse and that it contains a mass Mgas of gas. Also assume that half of this mass is converted into stars (M⋆ = 0.5Mgas ). a) The absolute bolometric magnitude for the galax ...
The Galaxy Presentation 2011
... - Halo might outweigh all of the disks stars by a factor of 10however, only a small number of halo stars? - Much of the halo’s mass is in the form of DARK MATTER - If the more distant stars orbit faster – shouldn’t the spiral arms look like a tightly- wound coil?? (pp. 560-562) ...
... - Halo might outweigh all of the disks stars by a factor of 10however, only a small number of halo stars? - Much of the halo’s mass is in the form of DARK MATTER - If the more distant stars orbit faster – shouldn’t the spiral arms look like a tightly- wound coil?? (pp. 560-562) ...
Astronomy 110 Announcements: 11.1 Properties of Stars
... Sometimes we can only detect a “wobble” of one star (can’t see the fainter one). ...
... Sometimes we can only detect a “wobble” of one star (can’t see the fainter one). ...
Lab 6
... Astronomers, including Edwin Hubble, began to use the Hertzsprung-Russell diagram as a powerful tool to determine stellar properties. Initially, the method of standard candles for individual stars was applied to whole clusters within the Milky Way; this method relies on the inverse-square law you sa ...
... Astronomers, including Edwin Hubble, began to use the Hertzsprung-Russell diagram as a powerful tool to determine stellar properties. Initially, the method of standard candles for individual stars was applied to whole clusters within the Milky Way; this method relies on the inverse-square law you sa ...
The Magnitude System
... Magnitudes have to be somehow related to the brightness of stars. And brightness is a measure of the total number of photons of energy E that are emitted from the star per second and that pass though the area of our detectors. The unit of brightness is ergs/sec/cm2, or if you use SI units, it is Wat ...
... Magnitudes have to be somehow related to the brightness of stars. And brightness is a measure of the total number of photons of energy E that are emitted from the star per second and that pass though the area of our detectors. The unit of brightness is ergs/sec/cm2, or if you use SI units, it is Wat ...
docx - STAO
... When you gaze up in the night sky some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars you may be able to observe different colours in the stars. The brightness and colour of a star depends on three factors: temperature, distance, and siz ...
... When you gaze up in the night sky some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars you may be able to observe different colours in the stars. The brightness and colour of a star depends on three factors: temperature, distance, and siz ...
Teacher Demo: Bright Star or Close Star?
... When you gaze up in the night sky some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars you may be able to observe different colours in the stars. The brightness and colour of a star depends on three factors: temperature, distance, and siz ...
... When you gaze up in the night sky some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars you may be able to observe different colours in the stars. The brightness and colour of a star depends on three factors: temperature, distance, and siz ...
Solutions Assignment #3
... Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have left the main sequence and are no longer burning hydrogen in their cores. k. Spica is the most massive of the main-sequence stars listed because it has the hottest spectral type of the main-sequence star ...
... Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have left the main sequence and are no longer burning hydrogen in their cores. k. Spica is the most massive of the main-sequence stars listed because it has the hottest spectral type of the main-sequence star ...
ph507lecnote06
... luminance, intensity, or "specific intensity". This is sometimes also called "surface brightness". Still another unit for intensity is magnitudes per square arcsec, which is the magnitude at which each square arcsec of an extended light source shines. Only visual magnitudes can be converted to photo ...
... luminance, intensity, or "specific intensity". This is sometimes also called "surface brightness". Still another unit for intensity is magnitudes per square arcsec, which is the magnitude at which each square arcsec of an extended light source shines. Only visual magnitudes can be converted to photo ...
Basic properties of stars
... This is data for NGC 2482. It is about 400 million years old. Stars considerably right of the main sequence are more distant giants. ...
... This is data for NGC 2482. It is about 400 million years old. Stars considerably right of the main sequence are more distant giants. ...
A Unique Environmental Studies Program
... Alpha Centauri is particularly interesting to astronomers because it is the nearest star visible to the naked eye, being 'only' 4.3 light years from earth. Another star in the same constellation, Proxima Centauri, is actually our closest star, at 4.2 light years from earth, but it is only visible th ...
... Alpha Centauri is particularly interesting to astronomers because it is the nearest star visible to the naked eye, being 'only' 4.3 light years from earth. Another star in the same constellation, Proxima Centauri, is actually our closest star, at 4.2 light years from earth, but it is only visible th ...
Multiple Choice, continued
... • The galaxy in which we live, the Milky Way, is a spiral galaxy in which the sun is one of hundreds of billions of stars. • Two irregular galaxies, the Large Magellanic Cloud and Small Magellanic Cloud, are our closest neighbors. • These three galaxies are called the Local Group. ...
... • The galaxy in which we live, the Milky Way, is a spiral galaxy in which the sun is one of hundreds of billions of stars. • Two irregular galaxies, the Large Magellanic Cloud and Small Magellanic Cloud, are our closest neighbors. • These three galaxies are called the Local Group. ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.