analysis of eclipsing binary data - Astrophysics
... determination exercise, but the recommended epoch must be used for the preparation of light and radial velocity curves to be submitted for marking. It is suggested that a wide period range be selected initially, with a period increment chosen so that something like ten or twenty periods will be trie ...
... determination exercise, but the recommended epoch must be used for the preparation of light and radial velocity curves to be submitted for marking. It is suggested that a wide period range be selected initially, with a period increment chosen so that something like ten or twenty periods will be trie ...
Chemical Evolution
... accretion to have occurred > 8Gyr ago. Perhaps more stringent limits come from the different elemental abundances, since timescale for Type Ia SNe only a few Gyr, but need detailed chemical evolution models. Halo can be formed from any system that formed stars early on, for only brief period , an ...
... accretion to have occurred > 8Gyr ago. Perhaps more stringent limits come from the different elemental abundances, since timescale for Type Ia SNe only a few Gyr, but need detailed chemical evolution models. Halo can be formed from any system that formed stars early on, for only brief period , an ...
A trio of metalrich dust and gas discs found orbiting candidate white
... Spitzer IRAC photometry of seven white dwarfs from the SDSS with apparent excess flux in UKIDSS K-band observations. Six of the science targets were selected from 16 785 DA star candidates identified either spectroscopically or photometrically within SDSS DR7, spatially cross-correlated with H K det ...
... Spitzer IRAC photometry of seven white dwarfs from the SDSS with apparent excess flux in UKIDSS K-band observations. Six of the science targets were selected from 16 785 DA star candidates identified either spectroscopically or photometrically within SDSS DR7, spatially cross-correlated with H K det ...
Unit 13―The “Fixed” Stars
... course you can locate Sirius) would have a magnitude of -1 and Arcturus and Vega would have a magnitude of 0―but the scale still works with those values. Then it gets stranger when we attempt to apply it to something other than the stars. The Moon has a magnitude of -12, Venus -3 and Neptune +8. Can ...
... course you can locate Sirius) would have a magnitude of -1 and Arcturus and Vega would have a magnitude of 0―but the scale still works with those values. Then it gets stranger when we attempt to apply it to something other than the stars. The Moon has a magnitude of -12, Venus -3 and Neptune +8. Can ...
X-ray Astronomy and the search for Black Holes
... • The hard X-rays are optical thin, thermal emission from the accreting plasma, as also seen in magnetic and non-magnetic CVs • These symbiotic stars have harder spectra than non-magnetic CVs • Yet they are unlikely to have a magnetic white dwarf • Non-magnetic CVs can have high temperatures if the ...
... • The hard X-rays are optical thin, thermal emission from the accreting plasma, as also seen in magnetic and non-magnetic CVs • These symbiotic stars have harder spectra than non-magnetic CVs • Yet they are unlikely to have a magnetic white dwarf • Non-magnetic CVs can have high temperatures if the ...
P7 Higher mark scheme - Corby Technical School
... It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace ...
... It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace ...
Decentralized Worm Detection Using p2p Networks
... • Advantages of smaller sensors – incentive outweighs cost of deployment, well hidden • Disadvantage: some may be faulty ...
... • Advantages of smaller sensors – incentive outweighs cost of deployment, well hidden • Disadvantage: some may be faulty ...
Distance Measures: Parallax
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
Distance Measures: Parallax
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
Does Light Travel with the Velocity of a Moving Source?
... the same velocity, such that the red one approaches the pulsar at speed 0.5c while the green one recedes at 0.5c. The pulsar emits a light burst at time 0, known to travel spherically outward at c. At time 1, t1 , the light burst reaches the red ship, which measures the effective light speed as the ...
... the same velocity, such that the red one approaches the pulsar at speed 0.5c while the green one recedes at 0.5c. The pulsar emits a light burst at time 0, known to travel spherically outward at c. At time 1, t1 , the light burst reaches the red ship, which measures the effective light speed as the ...
Chapter 7: The Galaxy, structure and content File
... appear for stars of all ages. (And these are clumps only in velocity space, not in real space.) The idea that there are groups of stars at similar velocities is itself not new—it actually dates from the early proper motion measurements of nearly a century ago. But these ‘streams’ have generally been ...
... appear for stars of all ages. (And these are clumps only in velocity space, not in real space.) The idea that there are groups of stars at similar velocities is itself not new—it actually dates from the early proper motion measurements of nearly a century ago. But these ‘streams’ have generally been ...
Properties of Stars - Montana State University Extended University
... http://www.bc.cc.ca.us/programs/sea/astronomy/starprop/strpropd.htm (10 of 11) [5/25/1999 10:32:05 AM] ...
... http://www.bc.cc.ca.us/programs/sea/astronomy/starprop/strpropd.htm (10 of 11) [5/25/1999 10:32:05 AM] ...
Stellar radii from long-baseline interferometry
... The cool dwarfs 61 Cyg A and B are the nearest stars in the northern hemisphere. They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel 1838), shortly before Procyon’s, and it is now k ...
... The cool dwarfs 61 Cyg A and B are the nearest stars in the northern hemisphere. They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel 1838), shortly before Procyon’s, and it is now k ...
Galaxy Questions Info
... containing spiral arms, and a halo. Elliptical galaxies have a bulgeshape and a halo, but do not have a disk. Bulge — A round structure made primarily of old stars, gas, and dust. The bulge of the Milky Way is roughly 10,000 light-years across. The outer parts of the bulge are difficult to distingui ...
... containing spiral arms, and a halo. Elliptical galaxies have a bulgeshape and a halo, but do not have a disk. Bulge — A round structure made primarily of old stars, gas, and dust. The bulge of the Milky Way is roughly 10,000 light-years across. The outer parts of the bulge are difficult to distingui ...
Pretty Pictures of the Cosmos
... visible with good binoculars towards the constellation of Sagittarius. The energetic processes of star formation create not only the colors but the chaos. ...
... visible with good binoculars towards the constellation of Sagittarius. The energetic processes of star formation create not only the colors but the chaos. ...
Summary: Modes of Star Formation
... internal motions are relatively small, and they then become moving groups or streams. The weak-lined T Tauri stars found by X-ray observations that were discussed at this meeting probably represent some of the remnants of associations that are just now dissolving into the field and becoming moving g ...
... internal motions are relatively small, and they then become moving groups or streams. The weak-lined T Tauri stars found by X-ray observations that were discussed at this meeting probably represent some of the remnants of associations that are just now dissolving into the field and becoming moving g ...
Estimating a common period for a set of irregularly
... indicator of stellar class. Figure 1(a) displays the light curve of the periodic variable OGLE-LMC-T2CEP-041 observed in the I band (×) and V band (◦) by the Optical Gravitational Lensing Experiment (OGLE) [Udalski et al. (2008)]. This star has been observed 702 times in the I band and 76 times in t ...
... indicator of stellar class. Figure 1(a) displays the light curve of the periodic variable OGLE-LMC-T2CEP-041 observed in the I band (×) and V band (◦) by the Optical Gravitational Lensing Experiment (OGLE) [Udalski et al. (2008)]. This star has been observed 702 times in the I band and 76 times in t ...
The Reception of the Copernican Revolution
... because it dethroned man from his central place in the universe. He preferred the new theory for ethical reasons, noting that Epicurean and Stoic philosophers had favored the heliocentric model long before Copernicus, and that they had done so with an eye to questioning the importance that man had s ...
... because it dethroned man from his central place in the universe. He preferred the new theory for ethical reasons, noting that Epicurean and Stoic philosophers had favored the heliocentric model long before Copernicus, and that they had done so with an eye to questioning the importance that man had s ...
Symposium on Telescope Science - Society for Astronomical Sciences
... camera and custom electronics to record fireball events that occur over Northern California. Images and links to videos will also be presented. The data was captured with Sandia Fireball Network cameras. These systems are operated by the Sierra College Astronomy Dept. and a private observatory in Ne ...
... camera and custom electronics to record fireball events that occur over Northern California. Images and links to videos will also be presented. The data was captured with Sandia Fireball Network cameras. These systems are operated by the Sierra College Astronomy Dept. and a private observatory in Ne ...
The Fundamental Plane, Stellar Popula6ons
... Median redshi^ ~15,000 km/s EffecBve volume ~2x107 h‐3 Mpc3 125,000 redshi^s (137,000 spectra) Primary sample mean completeness 88%; selecBon funcBon is well‐defined (depends on both posiBon and magnitude) ...
... Median redshi^ ~15,000 km/s EffecBve volume ~2x107 h‐3 Mpc3 125,000 redshi^s (137,000 spectra) Primary sample mean completeness 88%; selecBon funcBon is well‐defined (depends on both posiBon and magnitude) ...
A Study of the Spiral Galaxy M101 Elizabeth City State University
... the observing site. The Image Reduction and Analysis Facility (IRAF) is the software that was used for the image reduction process. Image reduction is the process of removing noise and calibrating CCD images. A number of types of noise are introduced into the images during the observing process. The ...
... the observing site. The Image Reduction and Analysis Facility (IRAF) is the software that was used for the image reduction process. Image reduction is the process of removing noise and calibrating CCD images. A number of types of noise are introduced into the images during the observing process. The ...
13.5 The HR Diagram By the early 1900s, astronomers had learned
... Giants, white dwarfs, and mainsequence stars differ in more than just diameter. They also differ dramatically in their overall density. Recall that density is a body's mass divided by its volume. For a given mass, a larger body will therefore have a lower density, and so a giant star is much less d ...
... Giants, white dwarfs, and mainsequence stars differ in more than just diameter. They also differ dramatically in their overall density. Recall that density is a body's mass divided by its volume. For a given mass, a larger body will therefore have a lower density, and so a giant star is much less d ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.