Iron in Stars
... exploding in a supernova. For stars in the mass range of 130 solar masses, this would result in a supernova for which is predicted a large proportion of the heavy elements created would take the form of iron. Population III stars have not been observed yet. This is due to the extremely short lifetim ...
... exploding in a supernova. For stars in the mass range of 130 solar masses, this would result in a supernova for which is predicted a large proportion of the heavy elements created would take the form of iron. Population III stars have not been observed yet. This is due to the extremely short lifetim ...
sections 16-18 instructor notes
... ii. by extrapolating the versus σΠ2 curve to its
extreme values for globular clusters. This technique also
has uncertainties owing to the unknown rate of rotation
for the globular cluster system about the Galactic centre,
as well as to the possible existence of two distinct groups
of globulars. ...
... ii. by extrapolating the
PPT
... light-years away), the supernova had actually exploded 150,000 years ago • When we look at galaxies that are more and more distant from us, we are seeing them at younger and younger stages of their evolution Page 48 ...
... light-years away), the supernova had actually exploded 150,000 years ago • When we look at galaxies that are more and more distant from us, we are seeing them at younger and younger stages of their evolution Page 48 ...
Scientific Requirements for Basic Angle Stability and Monitoring
... absence of proper motion. They are, however, faint: of the ∼ 400 000 quasars that will be observed by Gaia down to 20th magnitude, 75% are fainter than 19th mag, 21% between 19th and 18th mag, and only 4% brighter than 18th mag. Potentially, they could jointly define the parallax zero point to an ac ...
... absence of proper motion. They are, however, faint: of the ∼ 400 000 quasars that will be observed by Gaia down to 20th magnitude, 75% are fainter than 19th mag, 21% between 19th and 18th mag, and only 4% brighter than 18th mag. Potentially, they could jointly define the parallax zero point to an ac ...
Galaxy Structure
... In the last few years, independent evidence points to the existence of a bar in the inner Galaxy. This evidence results from NIR photometry (Blitz and Spergel 1991; Weiland et al 1994; Dwek et al 1995), from IRAS source counts (Nakada et al 1991; Whitelock and Catchpole 1992; Nikolaev and Weinberg 1 ...
... In the last few years, independent evidence points to the existence of a bar in the inner Galaxy. This evidence results from NIR photometry (Blitz and Spergel 1991; Weiland et al 1994; Dwek et al 1995), from IRAS source counts (Nakada et al 1991; Whitelock and Catchpole 1992; Nikolaev and Weinberg 1 ...
Answers to exam style questions
... sometimes shown as 10x. The value obtained in the equation is in pc, and must be converted to light year. The relationship between the power output of a star and its surface area has often been tested in this option in the past. It is important to make sure that the correct constant is chosen from t ...
... sometimes shown as 10x. The value obtained in the equation is in pc, and must be converted to light year. The relationship between the power output of a star and its surface area has often been tested in this option in the past. It is important to make sure that the correct constant is chosen from t ...
Lecture Topics 1023
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
Angular measurements
... (below), the remnants of a dying star that was once about five times the mass of the Sun http://www.hubblesite.org/newscenter/archive/releases/2009/25/image/f/. The star is 38,000 ly (light years) distant. The entire image spans 2.7 ly (2.4 arc minutes, or 6.98x10-5 radians). The angular resolution ...
... (below), the remnants of a dying star that was once about five times the mass of the Sun http://www.hubblesite.org/newscenter/archive/releases/2009/25/image/f/. The star is 38,000 ly (light years) distant. The entire image spans 2.7 ly (2.4 arc minutes, or 6.98x10-5 radians). The angular resolution ...
The light curves for a nova look like the following.
... Nova and supernova both represent sudden enhancement in the brightness of a star for few weeks or months and eventually the star becomes dim again. In the sky they may look alike but both are quite different processes. Differences: v A supernova is more than a million times brighter than a nova. v I ...
... Nova and supernova both represent sudden enhancement in the brightness of a star for few weeks or months and eventually the star becomes dim again. In the sky they may look alike but both are quite different processes. Differences: v A supernova is more than a million times brighter than a nova. v I ...
Some observed properties of Dark Matter: a progress report on an
... • How do planetary systems form? • To date many planets have been detected indirectly • Direct detection: – Mass, radius, temperature, composition – ELT will provide large samples of mature giant planets in reflected light – Earth-like planets may be within reach ...
... • How do planetary systems form? • To date many planets have been detected indirectly • Direct detection: – Mass, radius, temperature, composition – ELT will provide large samples of mature giant planets in reflected light – Earth-like planets may be within reach ...
A near IR adaptive optics search for faint companions to early
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
CRAZY ILLUSIONS can be created by the power of gravity. Objects
... Lensing is not always as obvious as in the examples above. If a star does the lensing, for example, the images are so close together that even the best telescopes cannot resolve them. This so-called microlensing effect is nonetheless measurable. Because the star is moving, the lens configuration— an ...
... Lensing is not always as obvious as in the examples above. If a star does the lensing, for example, the images are so close together that even the best telescopes cannot resolve them. This so-called microlensing effect is nonetheless measurable. Because the star is moving, the lens configuration— an ...
Active Galactic Nuclei: are they important?
... in galaxies, groups, and clusters, 1-5 June 2009, Fluno Center, Madison ...
... in galaxies, groups, and clusters, 1-5 June 2009, Fluno Center, Madison ...
13 Galaxies - Journigan-wiki
... disk-like structure without arms. The S0 galaxy shares properties of both spiral and elliptical galaxies and seems to bridge the gap between the two major types of galaxies. Hubble introduced the S0 class long after his ...
... disk-like structure without arms. The S0 galaxy shares properties of both spiral and elliptical galaxies and seems to bridge the gap between the two major types of galaxies. Hubble introduced the S0 class long after his ...
Read the article
... the micro-spiral could be zigzag, or helical. While a few stars spiral inside the micro-spiral center, some appear to be ejected from it. The IRS 16SW forms a bridge between the IRS 16 complex and the center of the microspiral, where several spring like helical structures can be observed. In fact, t ...
... the micro-spiral could be zigzag, or helical. While a few stars spiral inside the micro-spiral center, some appear to be ejected from it. The IRS 16SW forms a bridge between the IRS 16 complex and the center of the microspiral, where several spring like helical structures can be observed. In fact, t ...
Determining the Sizes of Stars Using the HR Diagram
... cores, but after awhile they evolve and begin to die. How long they live and what they evolve to become when they die depends on their mass. In fact, the mass of a star also determines its most important properties: its luminosity, temperature and radius. A star's luminosity, which is how much energ ...
... cores, but after awhile they evolve and begin to die. How long they live and what they evolve to become when they die depends on their mass. In fact, the mass of a star also determines its most important properties: its luminosity, temperature and radius. A star's luminosity, which is how much energ ...
FEEDBACK IN THE LOCAL UNIVERSE: The
... radio sources, presenting strong circumstantial evidence in support of the AGN feedback model. See Bîrzan et al. (2004) for a comprehensive census of the currently known X-ray cavity systems in groups and clusters of galaxies. (Credit: X-ray: NASA/CXC/U.Waterloo/C.Kirkpatrick et al.; Radio: NSF/NRAO ...
... radio sources, presenting strong circumstantial evidence in support of the AGN feedback model. See Bîrzan et al. (2004) for a comprehensive census of the currently known X-ray cavity systems in groups and clusters of galaxies. (Credit: X-ray: NASA/CXC/U.Waterloo/C.Kirkpatrick et al.; Radio: NSF/NRAO ...
- Europhysics News
... nicknamed NACO) in this peculiar hunt for the black hole. The idea behind those difficult measurements is that the trajectory of the stars orbiting a big mass should reveal differences depending on the way this mass is distributed: either as a cluster of a finite dimension or as a collapsed object. ...
... nicknamed NACO) in this peculiar hunt for the black hole. The idea behind those difficult measurements is that the trajectory of the stars orbiting a big mass should reveal differences depending on the way this mass is distributed: either as a cluster of a finite dimension or as a collapsed object. ...
Antlia, the Machine Pneumatique
... A special type of star can be found 3.3 degrees further north of zeta Antilae along the western border with Pyxis. S Antliae is an eclipsing binary of the EW Ursa Majoris type, a system of two dwarf stars in close orbit around each other. S Antliae varies by half a magnitude from 6.4 to 6.9 over a p ...
... A special type of star can be found 3.3 degrees further north of zeta Antilae along the western border with Pyxis. S Antliae is an eclipsing binary of the EW Ursa Majoris type, a system of two dwarf stars in close orbit around each other. S Antliae varies by half a magnitude from 6.4 to 6.9 over a p ...
Presentazione di PowerPoint
... Thanks to the new results on the multiple populations we are now looking at globular cluster (and cluster in general) stellar populations with new eyes. De facto, a new era on globular cluster research is started: 1) Many serious problems remain unsolved, and we still have a rather incoherent pictur ...
... Thanks to the new results on the multiple populations we are now looking at globular cluster (and cluster in general) stellar populations with new eyes. De facto, a new era on globular cluster research is started: 1) Many serious problems remain unsolved, and we still have a rather incoherent pictur ...
J: Chapter 4: Stars and Galaxies
... right eye closed, as the girl in Figure 3A is doing. Your thumb appears to change position with respect to the background. Now do the same experiment with your thumb closer to your face, as shown in Figure 3B. What do you observe? The nearer an object is to the observer, the greater its parallax is. ...
... right eye closed, as the girl in Figure 3A is doing. Your thumb appears to change position with respect to the background. Now do the same experiment with your thumb closer to your face, as shown in Figure 3B. What do you observe? The nearer an object is to the observer, the greater its parallax is. ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.