Bluffer`s Guide to Sirius
... of mistake made. Today Sirius is what proper astronomers call a ‘main sequence star’, meaning it is happily shining away generating energy from hydrogen. We expect Sirius will stay like this for another billion years or so. Since the 1840s we have known that Sirius has an unseen companion. By observ ...
... of mistake made. Today Sirius is what proper astronomers call a ‘main sequence star’, meaning it is happily shining away generating energy from hydrogen. We expect Sirius will stay like this for another billion years or so. Since the 1840s we have known that Sirius has an unseen companion. By observ ...
Asteroseismology of Solar-Like Stars
... frequency of the gaussian modulating the spectra. A scaling relation for νmax was found by Kjeldsen & Bedding 1995, which when combined with equation 6 leads to the final scaling relation to determine mass. νmax g ...
... frequency of the gaussian modulating the spectra. A scaling relation for νmax was found by Kjeldsen & Bedding 1995, which when combined with equation 6 leads to the final scaling relation to determine mass. νmax g ...
Stellar Evolution
... observed in the youngest galaxies at the farthest reaches of the Universe. ...
... observed in the youngest galaxies at the farthest reaches of the Universe. ...
Quasars: Back to the Infant Universe
... indicates hot, but not singletemperature central source ! Broad emission lines indicate very hot, rapidly orbiting gas ...
... indicates hot, but not singletemperature central source ! Broad emission lines indicate very hot, rapidly orbiting gas ...
Measuring Interstellar Extinction
... 1. Choose which open or globular cluster you will observe. Good targets will be ∼50–500 Myrold open clusters close to the galactic plane. The age range ensures the presence of B and/or A-type stars with near-zero magnitude colors, while the location ensures high amounts of interstellar extinction. O ...
... 1. Choose which open or globular cluster you will observe. Good targets will be ∼50–500 Myrold open clusters close to the galactic plane. The age range ensures the presence of B and/or A-type stars with near-zero magnitude colors, while the location ensures high amounts of interstellar extinction. O ...
TAP702-0: Red shift - Teaching Advanced Physics
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
TAP702-0: Red shift - Teaching Advanced Physics
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
TAP702-0: Red shift - Teaching Advanced Physics
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
... central disc, showing both red shifts and blue shifts. These show that one side of this gas disc is approaching us whilst the other side is receding. The disc seems to be rotating at a speed of about 550 km s–1. There is no evidence that the whole galaxy is rotating. ...
Log Scale Notes
... from SF to Petaluma (30 miles). Mathematically this looks like 3000 30 = 100 = 10 −→ 2. Notice that the number of orders of magnitude is the exponentwe raise 10 to in order to get the ratio. In symbols this means the orders of ...
... from SF to Petaluma (30 miles). Mathematically this looks like 3000 30 = 100 = 10 −→ 2. Notice that the number of orders of magnitude is the exponentwe raise 10 to in order to get the ratio. In symbols this means the orders of ...
instructor notes stellar evolution, star clusters
... much change in surface temperature, until they become radiative as well. Since high mass stars reach the ZAMS at the fastest rate, young clusters can contain many premain-sequence stars of low mass. ...
... much change in surface temperature, until they become radiative as well. Since high mass stars reach the ZAMS at the fastest rate, young clusters can contain many premain-sequence stars of low mass. ...
instructor notes stellar evolution, star clusters
... much change in surface temperature, until they become radiative as well. Since high mass stars reach the ZAMS at the fastest rate, young clusters can contain many premain-sequence stars of low mass. ...
... much change in surface temperature, until they become radiative as well. Since high mass stars reach the ZAMS at the fastest rate, young clusters can contain many premain-sequence stars of low mass. ...
document
... • Late life stages of high-mass stars are similar to those of low-mass stars: —Hydrogen core fusion (main sequence) ...
... • Late life stages of high-mass stars are similar to those of low-mass stars: —Hydrogen core fusion (main sequence) ...
HR DIAGRAMS OF STAR CLUSTERS
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
hr diagrams of star clusters
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
THE PERIOD OF ROTATION OF THE SUN
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
... areas---their radii can be a thousand times bigger than the sun. These are called red giants. Stars at the lower left of the diagram are exceptionally faint even though they are very hot, so they must be small---their radii are typically a hundred times smaller than the sun, or about the size of the ...
Searching for RR Lyrae Stars in M15
... RR Lyrae stars are low-mass variable stars, around 10-14 Gyr old, that pulsate radially with short periods. They were first discovered in nearby globular clusters about a 120 years ago. Today, around 1,500 RR Lyrae stars have been found in globular clusters (GCs) and around 6,000 isolated stars are ...
... RR Lyrae stars are low-mass variable stars, around 10-14 Gyr old, that pulsate radially with short periods. They were first discovered in nearby globular clusters about a 120 years ago. Today, around 1,500 RR Lyrae stars have been found in globular clusters (GCs) and around 6,000 isolated stars are ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.