pkt 14 Astrophysics
... Our Sun puts out about 3.87 x 1026 Watts of power, and we are 1.50 x 1011 m from it. What is the apparent brightness of the Sun from the Earth? Recall 3.87 x 1026 Watts comes from the Stefan-Boltzmann law ...
... Our Sun puts out about 3.87 x 1026 Watts of power, and we are 1.50 x 1011 m from it. What is the apparent brightness of the Sun from the Earth? Recall 3.87 x 1026 Watts comes from the Stefan-Boltzmann law ...
Estimating the Age of Supernova Remnants - Chandra X
... Purpose: To use the observed size of the Cassiopeia A supernova remnant (SNR) from its X-ray image and an estimated rate of expansion to calculate its approximate age. Background: ...
... Purpose: To use the observed size of the Cassiopeia A supernova remnant (SNR) from its X-ray image and an estimated rate of expansion to calculate its approximate age. Background: ...
Solutions to Homework #4, AST 203, Spring 2009
... c) If a 3.5 M main-sequence star is orbiting a 2.5 M red giant, the red giant must have been more massive than 3M when it was a main-sequence star. (7 points) Solution This statement makes sense. The 2.5M red giant had to be more massive than its companion at some point in the past in order for ...
... c) If a 3.5 M main-sequence star is orbiting a 2.5 M red giant, the red giant must have been more massive than 3M when it was a main-sequence star. (7 points) Solution This statement makes sense. The 2.5M red giant had to be more massive than its companion at some point in the past in order for ...
Studying Variable stars using Small Telescopes Observational
... Advantages of having Small Telescopes – 1. Convenient access to a telescope. 2. For sufficiently bright stars, small telescopes achieve same photometric accuracy as that of large telescopes. 3. With advanced increasing sophistications in optics and electronics it is possible for smaller telescopes t ...
... Advantages of having Small Telescopes – 1. Convenient access to a telescope. 2. For sufficiently bright stars, small telescopes achieve same photometric accuracy as that of large telescopes. 3. With advanced increasing sophistications in optics and electronics it is possible for smaller telescopes t ...
H-RDiagramSE
... diagram and become giants or supergiants. Giants and supergiants form when the center of a star collapses and its outer parts expand outwards. What are the characteristics of giants and supergiants? _____________________________ ...
... diagram and become giants or supergiants. Giants and supergiants form when the center of a star collapses and its outer parts expand outwards. What are the characteristics of giants and supergiants? _____________________________ ...
Lecture18
... H-R diagram • The cool supergiants in the upper right corner are as much as 10,000 times a luminous as the Sun and are very much larger than the Sun • The red, cool, low-luminosity stars in the lower right hand corner are about 80 times denser than the Sun • The white dwarfs in the lower left have v ...
... H-R diagram • The cool supergiants in the upper right corner are as much as 10,000 times a luminous as the Sun and are very much larger than the Sun • The red, cool, low-luminosity stars in the lower right hand corner are about 80 times denser than the Sun • The white dwarfs in the lower left have v ...
LET THE STARS GET IN YOUR EYES SKY MOTIONS
... One of the first steps in sky watching is learning to recognize constellations. Learning constellations requires a constellation chart, a red flashlight and your willingness to explore the sky. A red flashlight is a basic tool of astronomers because it won't ruin your night vision. You can paint you ...
... One of the first steps in sky watching is learning to recognize constellations. Learning constellations requires a constellation chart, a red flashlight and your willingness to explore the sky. A red flashlight is a basic tool of astronomers because it won't ruin your night vision. You can paint you ...
Lecture 14
... Gravity causes gas cloud to shrink and fragment. Cores of shrinking cloud fragments heat up. Collapse only continues if the cloud cools by radiating away heat. If the initial cloud was spinning a protostellar disk is formed. Protostars approach the main sequence from the right hand side of the HR di ...
... Gravity causes gas cloud to shrink and fragment. Cores of shrinking cloud fragments heat up. Collapse only continues if the cloud cools by radiating away heat. If the initial cloud was spinning a protostellar disk is formed. Protostars approach the main sequence from the right hand side of the HR di ...
Star Life Cycle Web Activity
... From this point on you may click on the Yellow Right Arrow at the bottom of each page. Or Click on Equilibrium of a Star. Read the web page and the summary of a typical cycle of stars given here. Stars repeat a cycle of reaching equilibrium and then losing it after burning out one fuel source…then ...
... From this point on you may click on the Yellow Right Arrow at the bottom of each page. Or Click on Equilibrium of a Star. Read the web page and the summary of a typical cycle of stars given here. Stars repeat a cycle of reaching equilibrium and then losing it after burning out one fuel source…then ...
Study Guide for 1ST Astronomy Exam
... 4. Final stage of planet growth is a late-stage heavy bombardment. o When the Sun “turned on” t-Tauri winds cleaned out the solar system of loose gas and dust terminating the planet formation process. Unit 49: The Sun, Our Star Describe the Sun in terms of a 2-layer model (49.2 and Hot Tips presen ...
... 4. Final stage of planet growth is a late-stage heavy bombardment. o When the Sun “turned on” t-Tauri winds cleaned out the solar system of loose gas and dust terminating the planet formation process. Unit 49: The Sun, Our Star Describe the Sun in terms of a 2-layer model (49.2 and Hot Tips presen ...
THE HR DIAGRAM
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
Star Formation
... • Supernova blast waves near clouds can initiate star formation (happened for our own sun, from SNe produced radioactive daughter products in meteorites) • Collapse raises density, core cannot radiate away heat gravitational collapse heat fast enough, and temp rises, until H fusion begins at 10 mill ...
... • Supernova blast waves near clouds can initiate star formation (happened for our own sun, from SNe produced radioactive daughter products in meteorites) • Collapse raises density, core cannot radiate away heat gravitational collapse heat fast enough, and temp rises, until H fusion begins at 10 mill ...
How far away are the Stars?
... • The closer the object the larger the parallax. • Parallaxes are usually very small. Parallax of Venus at closest approach (45 million km) is 1 arc minute! • Parallax of nearby (25 light years) stars not observed/measured until 1839! ...
... • The closer the object the larger the parallax. • Parallaxes are usually very small. Parallax of Venus at closest approach (45 million km) is 1 arc minute! • Parallax of nearby (25 light years) stars not observed/measured until 1839! ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.