D2 Stellar characteristics and stellar evolution
... Cepheid variables are stars with regular variation in luminosity (rapid brightening, gradual dimming) which is caused by periodic expansion and contraction of outer surface (brighter as it expands). This is to do with the balance between the nuclear and gravitational forces within the star. In most ...
... Cepheid variables are stars with regular variation in luminosity (rapid brightening, gradual dimming) which is caused by periodic expansion and contraction of outer surface (brighter as it expands). This is to do with the balance between the nuclear and gravitational forces within the star. In most ...
Absolute Magnitudes of Supernovae
... Figure 1: Six views of a distance galaxy with a supernova to the lower left of the galaxy. Notice the decreasing brightness and changing color of the supernova with time. (Hubble Space Telescope) ...
... Figure 1: Six views of a distance galaxy with a supernova to the lower left of the galaxy. Notice the decreasing brightness and changing color of the supernova with time. (Hubble Space Telescope) ...
click here - CAPSTONE 2011
... •Knowing a few stars by absolute magnitude in clusters allows us to use the same distance for all cluster stars and to place millions of stars in the HR diagram. • This then allows one to calibrate spectral signatures of luminosity (the H lines are not so broad in giants as in dwarfs) in any stars. ...
... •Knowing a few stars by absolute magnitude in clusters allows us to use the same distance for all cluster stars and to place millions of stars in the HR diagram. • This then allows one to calibrate spectral signatures of luminosity (the H lines are not so broad in giants as in dwarfs) in any stars. ...
What units are used in astronomical photometry?
... Astrometry: Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations mad ...
... Astrometry: Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations mad ...
Stellar Evolution
... all the same age but have different masses. • Stars in binary systems can evolve quite differently due to interactions with each other. ...
... all the same age but have different masses. • Stars in binary systems can evolve quite differently due to interactions with each other. ...
The Parent Stars of New Extrasolar Planet System Candidates
... it is possible that an inward-migrating planet was accreted by the star, thus changing the stellar surface and explaining the odd abundances observed. Unlike Gliese 876, the two stars HR 810 and HR 7875 are very similar to the sun. They are each close to one solar mass and are slightly younger than ...
... it is possible that an inward-migrating planet was accreted by the star, thus changing the stellar surface and explaining the odd abundances observed. Unlike Gliese 876, the two stars HR 810 and HR 7875 are very similar to the sun. They are each close to one solar mass and are slightly younger than ...
Time From the Perspective of a Particle Physicist
... Radius • Find that some are related Large Mass Large Brightness • Determine model of stellar formation and life cycle ...
... Radius • Find that some are related Large Mass Large Brightness • Determine model of stellar formation and life cycle ...
galctr
... -- yes, within 10 mas (orbit of S-2 has pericenter only 15 mas from Sgr A*) Is Sgr A* tied to the stellar cluster? -- yes; comparing proper motions from IR, radio; velocity with 70 km/s Is Sgr A* at the dynamic center of the Milky Way? -- yes, based on apparent motion of Sgr A* wrt background QS ...
... -- yes, within 10 mas (orbit of S-2 has pericenter only 15 mas from Sgr A*) Is Sgr A* tied to the stellar cluster? -- yes; comparing proper motions from IR, radio; velocity with 70 km/s Is Sgr A* at the dynamic center of the Milky Way? -- yes, based on apparent motion of Sgr A* wrt background QS ...
JimH This is Your Life - The Atlanta Astronomy Club
... •If the core of a star collapses with more than 3 solar masses, electron degeneracy and neutron degeneracy can’t stop the gravitational collapse. •The star collapses to a radius of zero , with infinite density and gravity—called a Singularity. ...
... •If the core of a star collapses with more than 3 solar masses, electron degeneracy and neutron degeneracy can’t stop the gravitational collapse. •The star collapses to a radius of zero , with infinite density and gravity—called a Singularity. ...
Chapter 17 Measuring the Stars
... must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be inversely proportional to the mass. This allows us to calculate the mass of each star. ...
... must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be inversely proportional to the mass. This allows us to calculate the mass of each star. ...
HOU Supernova Light Curves
... Galaxy. Various HOU images had been requested throughout February and March, and in early April, two girls at Oil City High School in Pennsylvania received an important phone call. They had serendipitously obtained the first images of a supernova in M51. A supernova is the violent process that a ver ...
... Galaxy. Various HOU images had been requested throughout February and March, and in early April, two girls at Oil City High School in Pennsylvania received an important phone call. They had serendipitously obtained the first images of a supernova in M51. A supernova is the violent process that a ver ...
common constellations
... Members of the Underground Railroad were fully aware of the predicament of fleeing slaves. About 1831 the Railroad began to send travelers into the South to secretly teach slaves specific routes they could navigate using Polaris. By the beginning of the Civil War in 1861, about 500 people a year wer ...
... Members of the Underground Railroad were fully aware of the predicament of fleeing slaves. About 1831 the Railroad began to send travelers into the South to secretly teach slaves specific routes they could navigate using Polaris. By the beginning of the Civil War in 1861, about 500 people a year wer ...
10 New Constellations
... Also known as Alpha Persei, Mirfak is located around 500 light years from Earth and is the brightest star in the constellation, it's a white supergiant with a diameter around 30 times larger than the sun. Algol Also known as Beta Persei, Algol is actually a three star system located around 90 light ...
... Also known as Alpha Persei, Mirfak is located around 500 light years from Earth and is the brightest star in the constellation, it's a white supergiant with a diameter around 30 times larger than the sun. Algol Also known as Beta Persei, Algol is actually a three star system located around 90 light ...
1/20/09 301 Physics Chapter 12 The Family of Stars Triangulation
... – For stars of a given temperature, the larger the radius, the larger the luminosity – Therefore, as one moves up the H-R diagram, a star’s radius must become bigger – On the other hand, for a given luminosity, the larger the radius, the smaller the temperature – Therefore, as one moves right on the ...
... – For stars of a given temperature, the larger the radius, the larger the luminosity – Therefore, as one moves up the H-R diagram, a star’s radius must become bigger – On the other hand, for a given luminosity, the larger the radius, the smaller the temperature – Therefore, as one moves right on the ...
TMSP Stellar Evolution & Life
... •BRIGHTNESS: how bright a star appears to our eyes and instruments, function of distance as well as intrinsic brightness or luminosity. •LUMINOSITY: how much energy the star is actually generating is a function of its mass (or size) and temperature (the big vs small bonfire analogy). •TEMPERATURE: s ...
... •BRIGHTNESS: how bright a star appears to our eyes and instruments, function of distance as well as intrinsic brightness or luminosity. •LUMINOSITY: how much energy the star is actually generating is a function of its mass (or size) and temperature (the big vs small bonfire analogy). •TEMPERATURE: s ...
AST1100 Lecture Notes
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
PHYSICS – Astrophysics Section I
... Section I- Our understanding of celestial objects depends upon observations made from Earth or from space near the Earth Discuss Galileo’s use of the telescope to identify features of the Moon In 1609, Galileo constructed his own powerful telescope after hearing about its ability to make objects loo ...
... Section I- Our understanding of celestial objects depends upon observations made from Earth or from space near the Earth Discuss Galileo’s use of the telescope to identify features of the Moon In 1609, Galileo constructed his own powerful telescope after hearing about its ability to make objects loo ...
Stellar Evolution
... • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! (hundreds of billions of pounds!) ...
... • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! (hundreds of billions of pounds!) ...