Night Sky Checklist October–November
... Algol is an eclipsing variable star in Perseus. Only moderately bright at best at magnitude 2.1, it dims to about 1/3 that brightness for about 10 hours in a cycle of slightly less than 3 days. If you watch it regularly, sooner or later you will catch it at its dimmest. Algol is a binary star, one r ...
... Algol is an eclipsing variable star in Perseus. Only moderately bright at best at magnitude 2.1, it dims to about 1/3 that brightness for about 10 hours in a cycle of slightly less than 3 days. If you watch it regularly, sooner or later you will catch it at its dimmest. Algol is a binary star, one r ...
Luminosities and magnitudes of stars
... a measure of how big that object appears to an observer at that point. For instance, a small object nearby could subtend the same solid angle as a large object far away. The solid angle is proportional to the surface area, S, of a projection of that object onto a sphere centered at that point, divid ...
... a measure of how big that object appears to an observer at that point. For instance, a small object nearby could subtend the same solid angle as a large object far away. The solid angle is proportional to the surface area, S, of a projection of that object onto a sphere centered at that point, divid ...
Constellations
... the people of other cultures, even though they were all looking at the same stars in the night sky. Interestingly, though, different cultures often made the same basic groupings of stars, despite widely varying interpretations of what they saw. For example, the group of seven stars usually known in ...
... the people of other cultures, even though they were all looking at the same stars in the night sky. Interestingly, though, different cultures often made the same basic groupings of stars, despite widely varying interpretations of what they saw. For example, the group of seven stars usually known in ...
Dim Stars - granthamkuehl
... The largest stars, giant stars have a mass of about 60 times the mass of the Sun. ...
... The largest stars, giant stars have a mass of about 60 times the mass of the Sun. ...
Notes - Bill Wolf
... The Magnitude System In the olden days, the Greek astronomer Hipparchus blessed the science of Astronomy with one of its worst attributes: the magnitude scales. He sought to classify the stars by their brightness with a number scale. The first group of stars to become visible at night were called ma ...
... The Magnitude System In the olden days, the Greek astronomer Hipparchus blessed the science of Astronomy with one of its worst attributes: the magnitude scales. He sought to classify the stars by their brightness with a number scale. The first group of stars to become visible at night were called ma ...
Dec 2017 - What`s Out Tonight?
... A Light Year (ly) is a unit of length and is equal to the discan be seen with the naked eye. tance light travels in one year. Since light moves at the speed of Our 186,282 miles a second, one light year is nearly 6 trillion miles Double Stars Moon long. The closest nighttime star visible to the nake ...
... A Light Year (ly) is a unit of length and is equal to the discan be seen with the naked eye. tance light travels in one year. Since light moves at the speed of Our 186,282 miles a second, one light year is nearly 6 trillion miles Double Stars Moon long. The closest nighttime star visible to the nake ...
ASTR2050 Spring 2005 •
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
(HR) Diagrams
... 16. Add labels and lines (mostly curves, actually) with arrows on the end of each (curvy) line, to show how a star such as the sun (a G2 star while it is on the main sequence) evolves through the following stages: a. protostar (which may have formed in a Bok globule) to main sequence star b. main se ...
... 16. Add labels and lines (mostly curves, actually) with arrows on the end of each (curvy) line, to show how a star such as the sun (a G2 star while it is on the main sequence) evolves through the following stages: a. protostar (which may have formed in a Bok globule) to main sequence star b. main se ...
Properties of Stars - Mr. Carter`s Earth
... The Hertzsprung-Russell diagram is actually a graph that illustrates the relationship that exists between the average surface temperature of stars and their absolute magnitude, which is how bright they would appear to be if they were all the same distance away. Rather than speak of the brightness of ...
... The Hertzsprung-Russell diagram is actually a graph that illustrates the relationship that exists between the average surface temperature of stars and their absolute magnitude, which is how bright they would appear to be if they were all the same distance away. Rather than speak of the brightness of ...
PHY2083
... The magnitudes of standard stars are corrected for absorption by the Earth’s atmosphere. The magnitude of any object determined by comparison is therefore a measure of its flux at Earth. This is called the APPARENT MAGNITUDE (m) In order to make comparisons more meaningful, define a measure of intri ...
... The magnitudes of standard stars are corrected for absorption by the Earth’s atmosphere. The magnitude of any object determined by comparison is therefore a measure of its flux at Earth. This is called the APPARENT MAGNITUDE (m) In order to make comparisons more meaningful, define a measure of intri ...
GIZMO H-RDiagramSE
... Gizmo Warm-up In the early 1900s, astronomers were able to identify many star characteristics such as color, size, temperature, and luminosity—or how bright a star is. However, astronomers did not yet understand exactly how these characteristics were related. Using the H-R Diagram Gizmo™, you will d ...
... Gizmo Warm-up In the early 1900s, astronomers were able to identify many star characteristics such as color, size, temperature, and luminosity—or how bright a star is. However, astronomers did not yet understand exactly how these characteristics were related. Using the H-R Diagram Gizmo™, you will d ...
a star is born reading
... to 100 thousand years. Even though they are very rare, many of the stars we see at night are blue giants. They burn brightly, and their light shines a very long distance. Blue giant stars die as a supernova. This is a spectacular explosion in space. It can be brighter than the entire galaxy and can ...
... to 100 thousand years. Even though they are very rare, many of the stars we see at night are blue giants. They burn brightly, and their light shines a very long distance. Blue giant stars die as a supernova. This is a spectacular explosion in space. It can be brighter than the entire galaxy and can ...
Astronomy 1 – Winter 2011
... To determine stellar mases we rely on binary star systems. As seen from Earth, the two stars that make up this binary system are separated by less than 1/3 arcsecond. For simplicity, the diagram shows one star as remaining stationary; in reality, both stars move around their common center of mass ...
... To determine stellar mases we rely on binary star systems. As seen from Earth, the two stars that make up this binary system are separated by less than 1/3 arcsecond. For simplicity, the diagram shows one star as remaining stationary; in reality, both stars move around their common center of mass ...
Stellar evolution
... - First occurs in a runaway process: "the helium flash". Energy from fusion goes into re-expanding and cooling the core. This slows fusion, so star gets dimmer again. - Then stable He -> C burning. Still have H -> He shell burning surrounding it. ...
... - First occurs in a runaway process: "the helium flash". Energy from fusion goes into re-expanding and cooling the core. This slows fusion, so star gets dimmer again. - Then stable He -> C burning. Still have H -> He shell burning surrounding it. ...
Astronomy Day 2006: A short presentation on eclipsing binary stars
... Just what are they? Why do we care? It is recognized as fact by astronomers that well over half of the stars in the universe belong to multiple systems. You might think of our Sun as being an exceptional system that involves only one star and you would be right. ...
... Just what are they? Why do we care? It is recognized as fact by astronomers that well over half of the stars in the universe belong to multiple systems. You might think of our Sun as being an exceptional system that involves only one star and you would be right. ...
Binary Stars (Professor Powerpoint)
... Some binaries are too close together to be resolved, you may still be able to detect the binary through the Doppler shift (in one or both stars). They must be relatively close to each other (short orbital period). If you can see both stars’ spectrums, you may be able to use Doppler shifts to measure ...
... Some binaries are too close together to be resolved, you may still be able to detect the binary through the Doppler shift (in one or both stars). They must be relatively close to each other (short orbital period). If you can see both stars’ spectrums, you may be able to use Doppler shifts to measure ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.