Chapter 16 - Astronomy
... formed. When we look at a spiral galaxy, the arms are obvious to us because they are the areas containing the bright stars. 6. One problem with the density wave theory is the question of how the density wave is sustained through the life of the galaxy. Also, observations of the Whirlpool Galaxy show ...
... formed. When we look at a spiral galaxy, the arms are obvious to us because they are the areas containing the bright stars. 6. One problem with the density wave theory is the question of how the density wave is sustained through the life of the galaxy. Also, observations of the Whirlpool Galaxy show ...
AAVSO: Mu Cephei, October 2002 Variable Star Of The Month
... has been particularly valuable to later researchers because it is largely free from the observer-dependent errors that normally plague visual observations of red stars. As a consequence, Plassman's data has been central to practically all subsequent studies of the periodicity of this star. ...
... has been particularly valuable to later researchers because it is largely free from the observer-dependent errors that normally plague visual observations of red stars. As a consequence, Plassman's data has been central to practically all subsequent studies of the periodicity of this star. ...
Axial Resolution of Adaptive Optics Scanning Laser
... about planets around other stars. But direct detection is the the ultimate step. This poster describes our how we can achieve direct detection of planets around young, nearby stars by using Keck adaptive optics at near-infrared wavelengths. Our survey comprises over 100 stars, all within 60 pc of th ...
... about planets around other stars. But direct detection is the the ultimate step. This poster describes our how we can achieve direct detection of planets around young, nearby stars by using Keck adaptive optics at near-infrared wavelengths. Our survey comprises over 100 stars, all within 60 pc of th ...
Sample pages 1 PDF
... above (face-on), the other from the side (edge-on). These are all stellar systems in which the majority of stars are confined to a relatively thin disk. In our own Galaxy, this disk can be seen as the band of stars stretched across the night sky, which led to it being named the Milky Way. Besides su ...
... above (face-on), the other from the side (edge-on). These are all stellar systems in which the majority of stars are confined to a relatively thin disk. In our own Galaxy, this disk can be seen as the band of stars stretched across the night sky, which led to it being named the Milky Way. Besides su ...
Stellar Continua
... • Varies smoothly with changing temperature • Slope is negative (blue is brighter) for hot stars and positive (visual is brighter) for cooler stars • B-V works as a temperature indicator from 3500K to 9000K (but depends on metallicity) • For hotter stars, neutral H and H- opacities diminish, continu ...
... • Varies smoothly with changing temperature • Slope is negative (blue is brighter) for hot stars and positive (visual is brighter) for cooler stars • B-V works as a temperature indicator from 3500K to 9000K (but depends on metallicity) • For hotter stars, neutral H and H- opacities diminish, continu ...
AstroMaster Series Telescopes
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your telescope’s operation. The manual gives detailed informati ...
... Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your telescope’s operation. The manual gives detailed informati ...
Our Local Group of Galaxies
... Walker et al (2009, ApJ, 704, 1274) also find that the total mass inside 300pc is essentially constant - although they note that for the lowest luminosity systems, the M(300pc) values are extrapolations and there is no direct evidence that the dark matter halo extends to such a radius, so the actual ...
... Walker et al (2009, ApJ, 704, 1274) also find that the total mass inside 300pc is essentially constant - although they note that for the lowest luminosity systems, the M(300pc) values are extrapolations and there is no direct evidence that the dark matter halo extends to such a radius, so the actual ...
Candidate detector assessment for the CASTOR
... Agency (CSA) mission that would provide panoramic, high-resolution imaging of 1/8th of the sky in the UV/optical (150-550 nm) spectral region. This small-satellite class mission would provide high angular resolution ultra-deep imaging in three broad filters to supplement data from planned internatio ...
... Agency (CSA) mission that would provide panoramic, high-resolution imaging of 1/8th of the sky in the UV/optical (150-550 nm) spectral region. This small-satellite class mission would provide high angular resolution ultra-deep imaging in three broad filters to supplement data from planned internatio ...
Title of Book: Deep Simplicity, John Gribbin Seven
... stripes in a bar code, and are just as individual; one particular pattern will unambiguously reveal the presence of iron, say, while others (more relevant in the present context) are associated with oxygen, or methane, or carbon dioxide. The French observations showed for the first time that the atm ...
... stripes in a bar code, and are just as individual; one particular pattern will unambiguously reveal the presence of iron, say, while others (more relevant in the present context) are associated with oxygen, or methane, or carbon dioxide. The French observations showed for the first time that the atm ...
The Interstellar Medium White Paper
... aspects of the dynamics of the Galactic nucleus and its outflow that we do not understand. It is still under debate, for instance, whether it has indeed been star formation (Crocker and Aharonian 2011) or, alternatively, activity of the central super-massive black hole (e.g. Su & Finkbeiner 2012) th ...
... aspects of the dynamics of the Galactic nucleus and its outflow that we do not understand. It is still under debate, for instance, whether it has indeed been star formation (Crocker and Aharonian 2011) or, alternatively, activity of the central super-massive black hole (e.g. Su & Finkbeiner 2012) th ...
ISNS3371_041007_bw
... planet in the year 1995. – A planet was discovered in orbit around the star 51 Pegasi. – Over 100 such extrasolar planets are now known to exist. ...
... planet in the year 1995. – A planet was discovered in orbit around the star 51 Pegasi. – Over 100 such extrasolar planets are now known to exist. ...
The Milky Way and other Galaxies
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be ...
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be ...
Riccioli Measures the Stars: Observations of the
... the stars dwarf the orbit of the Earth.* Riccioli also critiques Landsbergius who cites naked eye measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diam ...
... the stars dwarf the orbit of the Earth.* Riccioli also critiques Landsbergius who cites naked eye measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diam ...
Filters and General Equipment for Astronomical Observing
... using filters to see subtle details on some Solar System objects. Not to be forgotten is the fact that occasionally you can combine filters to produce a better visual view, though be careful that you do not end up with a set of filters that will give you a neutral density! Combining some red green a ...
... using filters to see subtle details on some Solar System objects. Not to be forgotten is the fact that occasionally you can combine filters to produce a better visual view, though be careful that you do not end up with a set of filters that will give you a neutral density! Combining some red green a ...
Chapter 10
... and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of light and matter to learn about nature on the astronomical ...
... and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of light and matter to learn about nature on the astronomical ...
absorption lines
... and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of light and matter to learn about nature on the astronomical ...
... and death of stars, the theme of the next five chapters, we begin with a chapter about the gas and dust between the stars. It is the flour from which nature bakes stars. This chapter clearly illustrates how astronomers use the interaction of light and matter to learn about nature on the astronomical ...
Part1
... o The infrared continuum is a key tracer of the distribution of dust and the dust-to-gas ratio is intimately related to heavy element enrichment (e.g., you need dust to see IR!). o Along similar lines, millimeter line tracers of the ISM are key to robustly measure the dust-to-gas ratio in large syst ...
... o The infrared continuum is a key tracer of the distribution of dust and the dust-to-gas ratio is intimately related to heavy element enrichment (e.g., you need dust to see IR!). o Along similar lines, millimeter line tracers of the ISM are key to robustly measure the dust-to-gas ratio in large syst ...
–1– 2. Milky Way We know a great deal, perhaps more than any
... • Herschel (1785) used star counts to infer a flattened distribution for the MW. • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is ...
... • Herschel (1785) used star counts to infer a flattened distribution for the MW. • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is ...
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... schematically shown in Figure 1. Such a concept for planet finding was first proposed by Spitzer (1962) [4] using an apodized screen and later again by Marchal (1985) [5] employing shaped projections around the edges. Since then a number of proposals have been put forward employing apodized screens ...
... schematically shown in Figure 1. Such a concept for planet finding was first proposed by Spitzer (1962) [4] using an apodized screen and later again by Marchal (1985) [5] employing shaped projections around the edges. Since then a number of proposals have been put forward employing apodized screens ...
User support: lessons learned from HST
... observing is rather complex compared to most ground based observatories or other space based missions. Thus, most observers require assistance in creating schedulable and well designed observing programs. After the observations are taken the observers must be able to properly calibrate and reduce th ...
... observing is rather complex compared to most ground based observatories or other space based missions. Thus, most observers require assistance in creating schedulable and well designed observing programs. After the observations are taken the observers must be able to properly calibrate and reduce th ...
June 2015 - Bristol Astronomical Society
... the Sun. If placed here, the star would extend well out past the orbit of Mars and into the inner part of the asteroid belt. Ras Algethi appears to be losing mass at a rate of about a ten-millionth of a solar mass per year, consistent with it being a highly distended supergiant. With a birth mass of ...
... the Sun. If placed here, the star would extend well out past the orbit of Mars and into the inner part of the asteroid belt. Ras Algethi appears to be losing mass at a rate of about a ten-millionth of a solar mass per year, consistent with it being a highly distended supergiant. With a birth mass of ...
Activity 6 The Electromagnetic Spectrum and Your Community
... Christiaan Huygens proposed the idea that light travels in the form of tiny waves. It’s known that light with shorter wavelengths is bent (refracted) more than light with longer wavelengths when it passes through a boundary between two different substances.Violet light is refracted the most, because ...
... Christiaan Huygens proposed the idea that light travels in the form of tiny waves. It’s known that light with shorter wavelengths is bent (refracted) more than light with longer wavelengths when it passes through a boundary between two different substances.Violet light is refracted the most, because ...
Active primary mirror support for the 2.1-m
... concentric rings, six on the inner ring and 12 on the outer ring. The multiplicity on the outer ring ~12! allows us to induce and correct deformations of azimuthal frequency 2 and 3, such as astigmatism and triangular comma, according to their Zernike expansions.9 In the radial direction, two actuat ...
... concentric rings, six on the inner ring and 12 on the outer ring. The multiplicity on the outer ring ~12! allows us to induce and correct deformations of azimuthal frequency 2 and 3, such as astigmatism and triangular comma, according to their Zernike expansions.9 In the radial direction, two actuat ...
Night Sky Observations
... Alt-Azimuth: An easy coordinate system. Altitude is measured from the horizon to the zenith (the point directly above you). The horizon is equal to 0 degrees and the zenith is 90 degrees. Azimuth is the 360 degree circle around you, 0 degrees being due north, 90 degrees east, 180 degrees south and 2 ...
... Alt-Azimuth: An easy coordinate system. Altitude is measured from the horizon to the zenith (the point directly above you). The horizon is equal to 0 degrees and the zenith is 90 degrees. Azimuth is the 360 degree circle around you, 0 degrees being due north, 90 degrees east, 180 degrees south and 2 ...
Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments are no longer usable. However, the two shortest-wavelength modules of the IRAC camera are still operable with the same sensitivity as before the cryogen was exhausted, and will continue to be used in the Spitzer Warm Mission. All Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).In keeping with NASA tradition, the telescope was renamed after its successful demonstration of operation, on 18 December 2003. Unlike most telescopes that are named after famous deceased astronomers by a board of scientists, the new name for SIRTF was obtained from a contest open to the general public.The contest led to the telescope being named in honor of astronomer Lyman Spitzer, who had promoted the concept of space telescopes in the 1940s. Spitzer wrote a 1946 report for RAND Corporation describing the advantages of an extraterrestrial observatory and how it could be realized with available or upcoming technology. He has been cited for his pioneering contributions to rocketry and astronomy, as well as ""his vision and leadership in articulating the advantages and benefits to be realized from the Space Telescope Program.""The US$800 million Spitzer was launched from Cape Canaveral Air Force Station, on a Delta II 7920H ELV rocket, Monday, 25 August 2003 at 13:35:39 UTC-5 (EDT).It follows a heliocentric instead of geocentric orbit, trailing and drifting away from Earth's orbit at approximately 0.1 astronomical unit per year (a so-called ""earth-trailing"" orbit). The primary mirror is 85 centimeters (33 in) in diameter, f/12, made of beryllium and is cooled to 5.5 K (−449.77 °F). The satellite contains three instruments that allow it to perform astronomical imaging and photometry from 3 to 180 micrometers, spectroscopy from 5 to 40 micrometers, and spectrophotometry from 5 to 100 micrometers.