Lecture 9: Stellar Spectra
... Most of the H is ionized, so only very weak H lines in visible A Stars (7500-11,000K) Ideal excitation conditions, strongest H lines in visible. G stars (5200-5900 K) Too cool, little excited H, so only weak H lines in the visible Line strengths diagram shown in Figure 19-12 ...
... Most of the H is ionized, so only very weak H lines in visible A Stars (7500-11,000K) Ideal excitation conditions, strongest H lines in visible. G stars (5200-5900 K) Too cool, little excited H, so only weak H lines in the visible Line strengths diagram shown in Figure 19-12 ...
The Scales of Things
... • Measure the time it takes beam to leave Earth, bounce off planet (or whatever), and return to Earth. This represents the time for the beam, traveling at c, to cover twice the distance between Earth and the target object. 2d = c t d = ct/2 d ...
... • Measure the time it takes beam to leave Earth, bounce off planet (or whatever), and return to Earth. This represents the time for the beam, traveling at c, to cover twice the distance between Earth and the target object. 2d = c t d = ct/2 d ...
Lecture Eight (Powerpoint format) - Flash
... Globular clusters are distributed in a sphere around the galaxy. Other disk galaxies have been observed to have their own system of globular clusters surrounding them. Some globulars may pass through the plane of the galactic disk from time to time, stripping away some stars in a “disk shockin ...
... Globular clusters are distributed in a sphere around the galaxy. Other disk galaxies have been observed to have their own system of globular clusters surrounding them. Some globulars may pass through the plane of the galactic disk from time to time, stripping away some stars in a “disk shockin ...
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 ...
Chapter 12
... – Superimposed on this orbital motion are small random motions of about 20 km/sec – In addition to their motion through space, stars spin on their axes and this spin can be measured using the Doppler shift technique – young stars are found to rotate faster than old stars ...
... – Superimposed on this orbital motion are small random motions of about 20 km/sec – In addition to their motion through space, stars spin on their axes and this spin can be measured using the Doppler shift technique – young stars are found to rotate faster than old stars ...
The Constellations
... Summary—Movements of Stars Pattern in the Sky • Star pattern repeats itself about every 24 hours… because of the rotation of Earth with respect to the distant stars! • Star pattern in the winter is different from that in the summer… because of the revolution of Earth around the Sun! • Stars do move ...
... Summary—Movements of Stars Pattern in the Sky • Star pattern repeats itself about every 24 hours… because of the rotation of Earth with respect to the distant stars! • Star pattern in the winter is different from that in the summer… because of the revolution of Earth around the Sun! • Stars do move ...
On the nature of early-type emission line objects in NGC6611
... age, luminosity) were then estimated by interpolation in theoretical evolutionary tracks computed for a Solar metallicity (Schaller et al. 1992). A part of stars in the sample (mainly the massive stars) are young and are close to the ZAMS. However, the analysis of our results demonstrates that a gro ...
... age, luminosity) were then estimated by interpolation in theoretical evolutionary tracks computed for a Solar metallicity (Schaller et al. 1992). A part of stars in the sample (mainly the massive stars) are young and are close to the ZAMS. However, the analysis of our results demonstrates that a gro ...
The Hubble Space Telescope - the first 10 years
... • If you move an object away it gets fainter • Once its 10x further away it is 100x fainter • Hence if we know how bright a star SHOULD be and we measure how bright it ACTUALLY is we can estimate the distance • This relies on finding stars with KNOWN brightness and luckily their exist a class of sta ...
... • If you move an object away it gets fainter • Once its 10x further away it is 100x fainter • Hence if we know how bright a star SHOULD be and we measure how bright it ACTUALLY is we can estimate the distance • This relies on finding stars with KNOWN brightness and luckily their exist a class of sta ...
Grossmugl Star Walk Installation
... 600 and 500 BC. This was the time when Babylon experienced one of its wealthiest periods under king Nebuchadnezzar II, democracy was invented in Athens and the city of Rome was still a small kingdom, far from the great empire it would later become. When stargazing at this historic site one can almos ...
... 600 and 500 BC. This was the time when Babylon experienced one of its wealthiest periods under king Nebuchadnezzar II, democracy was invented in Athens and the city of Rome was still a small kingdom, far from the great empire it would later become. When stargazing at this historic site one can almos ...
May 2013 - Otterbein
... Some look blue, some red Some live shorter, others longer Some end up as black holes, some as neutron stars, some as white dwarfs ...
... Some look blue, some red Some live shorter, others longer Some end up as black holes, some as neutron stars, some as white dwarfs ...
Stellar Evolution
... Near solar-mass stars undergo heavy mass loss in the asymptotic phase forming planetary nebula. Massive stars undergo heavy mass low in a similar evolutionary phase, i.e. after significant nuclear ash accumulates. Wolf-Rayet stars are among the most massive (typically over 20 solar masses), hottest ...
... Near solar-mass stars undergo heavy mass loss in the asymptotic phase forming planetary nebula. Massive stars undergo heavy mass low in a similar evolutionary phase, i.e. after significant nuclear ash accumulates. Wolf-Rayet stars are among the most massive (typically over 20 solar masses), hottest ...
Astronomy Part 1 - Malvern Troop 7
... b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. In another sketch, show its position several hours later. In both sketches, show the North St ...
... b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. In another sketch, show its position several hours later. In both sketches, show the North St ...
September 2011 - Newbury Astronomical Society
... second star called Mirach. From Mirach move up to the star in the upper line then on an equal distance to a second star. Just to the right of this second star is a fuzzy patch of light, this is M31. M31 can be seen with the unaided eye on a good clear night but is quite obvious when seen through bin ...
... second star called Mirach. From Mirach move up to the star in the upper line then on an equal distance to a second star. Just to the right of this second star is a fuzzy patch of light, this is M31. M31 can be seen with the unaided eye on a good clear night but is quite obvious when seen through bin ...
Celebrating the centennial of a celestial yardstick
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
Asymptotic Giant Branch
... layer must absorb heat (opacity has to increase) during maximum compression • Normally opacity decreases with increasing T (i.e. increasing P) • Solution: partially ionized zones compression produces further ionization ...
... layer must absorb heat (opacity has to increase) during maximum compression • Normally opacity decreases with increasing T (i.e. increasing P) • Solution: partially ionized zones compression produces further ionization ...
December
... Kemble’s Cascade, located in the constellation Camelopardalis, is an asterism - a pattern created by unrelated stars. It is an apparent straight line of more than 20 colorful fifth to 10th magnitude stars over a distance of approximately five moon diameters, and the open cluster NGC 1502 can be foun ...
... Kemble’s Cascade, located in the constellation Camelopardalis, is an asterism - a pattern created by unrelated stars. It is an apparent straight line of more than 20 colorful fifth to 10th magnitude stars over a distance of approximately five moon diameters, and the open cluster NGC 1502 can be foun ...
Triangulation Trigonometric Parallax
... – Superimposed on this orbital motion are small random motions of about 20 km/sec – In addition to their motion through space, stars spin on their axes and this spin can be measured using the Doppler shift technique – young stars are found to rotate faster than old stars ...
... – Superimposed on this orbital motion are small random motions of about 20 km/sec – In addition to their motion through space, stars spin on their axes and this spin can be measured using the Doppler shift technique – young stars are found to rotate faster than old stars ...
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.