The Triple-Ring Nebula: Fingerprint of a Binary Merger
... merger of two stars about 20,000 years before the explosion has long been the leading model for the progenitor8 . In this model, the system consisted initially of two massive stars, one with a mass of 15 – 20 times the mass of the Sun and a less massive companion with a mass of times the mass of t ...
... merger of two stars about 20,000 years before the explosion has long been the leading model for the progenitor8 . In this model, the system consisted initially of two massive stars, one with a mass of 15 – 20 times the mass of the Sun and a less massive companion with a mass of times the mass of t ...
Slide 1
... IIIa. How can we measure the properties of RS CVn stars? • Need high resolution spectroscopy in order to see spectral features from both stars in the binary. • Need to observe wavelengths that are sensitive to the magnetically active region between the chromosphere and the corona (i.e., the transit ...
... IIIa. How can we measure the properties of RS CVn stars? • Need high resolution spectroscopy in order to see spectral features from both stars in the binary. • Need to observe wavelengths that are sensitive to the magnetically active region between the chromosphere and the corona (i.e., the transit ...
TO THE STATISTICS OF DOUBLE STARS It was indicated by a
... It was indicated by a number of authors, that the study of distribution law of elements of double stars orbits, as well as of other statistical interrelations for these objects, can give interesting results for cosmogony in general and for the age problem of our star system in particular. However, a ...
... It was indicated by a number of authors, that the study of distribution law of elements of double stars orbits, as well as of other statistical interrelations for these objects, can give interesting results for cosmogony in general and for the age problem of our star system in particular. However, a ...
PART II: Life of a Star
... • After BBN there was a cold, dark phase in the Universe's history -- since there were no stars yet (the 'Dark Ages') . • When the first stars did start to form the formation gas was devoid of metals. • This affects Star Formation since protostellar gas clouds are thought to cool (and therefore coll ...
... • After BBN there was a cold, dark phase in the Universe's history -- since there were no stars yet (the 'Dark Ages') . • When the first stars did start to form the formation gas was devoid of metals. • This affects Star Formation since protostellar gas clouds are thought to cool (and therefore coll ...
High-mass stars in the Galactic center Quintuplet cluster
... tracks including the effects of rotation (solid lines) and without (dashed lines) by Meynet & Maeder (2003, Geneva tracks). The tracks were calculated for solar metallicity and different initial masses. It can clearly be seen, that the tracks with rotation don’t reach into the cool domain the stars ...
... tracks including the effects of rotation (solid lines) and without (dashed lines) by Meynet & Maeder (2003, Geneva tracks). The tracks were calculated for solar metallicity and different initial masses. It can clearly be seen, that the tracks with rotation don’t reach into the cool domain the stars ...
Ecosystems, from life, to the Earth, to the Galaxy
... interacting and evolving in a manner determined by the totality of their biological and physical environment. Driven by an energy source, typically the Sun, material is re-cycled and the system is in a self-regulating, non-equilibrium state. Ecosystems are not just confined to geographical regions o ...
... interacting and evolving in a manner determined by the totality of their biological and physical environment. Driven by an energy source, typically the Sun, material is re-cycled and the system is in a self-regulating, non-equilibrium state. Ecosystems are not just confined to geographical regions o ...
BSA Astronomy Merit Badge
... areas. • Don't walk on frostbitten feet or toes if possible. • Depending on severity see a doctor • Dress in several layers of loose, warm clothing rather than a single layer. • Wear a hat that fully covers your ears. • Wear mittens rather than gloves ...
... areas. • Don't walk on frostbitten feet or toes if possible. • Depending on severity see a doctor • Dress in several layers of loose, warm clothing rather than a single layer. • Wear a hat that fully covers your ears. • Wear mittens rather than gloves ...
4. Stars and resolved stellar populations
... wide-field 3D spectrograph would be uniquely powerful, to derive the details of chemical abundance and radial velocities for the majority of stars, especially in selected areas, with the Magellanic Clouds and the Bulge as obvious primary candidates (see e.g. Pasquini and Kissler 2002). Very dense st ...
... wide-field 3D spectrograph would be uniquely powerful, to derive the details of chemical abundance and radial velocities for the majority of stars, especially in selected areas, with the Magellanic Clouds and the Bulge as obvious primary candidates (see e.g. Pasquini and Kissler 2002). Very dense st ...
ATNF Steering Committee – Astrophysics highlights
... useful tracer of molecular cores in the stages preceding gravitational collapse. Its metastable (J=K) inversion levels are excited by collisions and are much less affected by spontaneous emission than most other molecules. It is therefore an excellent interstellar thermometer. By comparing, for exam ...
... useful tracer of molecular cores in the stages preceding gravitational collapse. Its metastable (J=K) inversion levels are excited by collisions and are much less affected by spontaneous emission than most other molecules. It is therefore an excellent interstellar thermometer. By comparing, for exam ...
The Effective Temperature and the Absolute Magnitude of the Stars
... seems to be outside the reach of traditional scientific research methods. However, these celestial objects are continuously sending out information to the outer space through the material barriers inside themselves, and this information can be registered in the form of observational data. Therefore, ...
... seems to be outside the reach of traditional scientific research methods. However, these celestial objects are continuously sending out information to the outer space through the material barriers inside themselves, and this information can be registered in the form of observational data. Therefore, ...
near-infrared adaptive optics imaging of high-redshift
... defects. In order to take into account possible small variations of the local background with respect to the overall zero level of the sky-subtracted images, we computed the average signal in a circular annulus centered on the source and with radii of about 300 Y400 and 500 Y600 . We checked that in ...
... defects. In order to take into account possible small variations of the local background with respect to the overall zero level of the sky-subtracted images, we computed the average signal in a circular annulus centered on the source and with radii of about 300 Y400 and 500 Y600 . We checked that in ...
flare swg usa
... Fitting SEDS: The long-λ fluxes from cool dust have ambiguous SED fits, while higher spatial resolution, near-IR fluxes from clustered sources are often very much fainter. FLARE can reach ~8 mag deeper than IRAC surveys at 3.5 μm, enabling the measurement of the NIR SEDs of young (<104 yr old) ...
... Fitting SEDS: The long-λ fluxes from cool dust have ambiguous SED fits, while higher spatial resolution, near-IR fluxes from clustered sources are often very much fainter. FLARE can reach ~8 mag deeper than IRAC surveys at 3.5 μm, enabling the measurement of the NIR SEDs of young (<104 yr old) ...
Galaxies - gilbertmath.com
... thick at its widest point, near the core. Our Solar System, on the other hand, is about ...
... thick at its widest point, near the core. Our Solar System, on the other hand, is about ...
The Death of a Star - hrsbstaff.ednet.ns.ca
... that when a planet passes between a distant star and an observer on earth the brightness will lessen momentarily. NASA launched a telescope that can measure this change in brightness and use it to calculate the orbit of the planet as well as its mass. The last method of detection is old fashioned ra ...
... that when a planet passes between a distant star and an observer on earth the brightness will lessen momentarily. NASA launched a telescope that can measure this change in brightness and use it to calculate the orbit of the planet as well as its mass. The last method of detection is old fashioned ra ...
Article PDF - IOPscience
... analyzed here (NGC 6240 and NGC 6000). We refer the reader to Mattila et al. (2007), Kankare et al. (2008, 2012), Väisänen et al. (2008a, 2008b), and Randriamanakoto et al. (2013) for details of observations and data reduction. 2.1. Photometry and SSC Selection The SSC candidate photometric catalo ...
... analyzed here (NGC 6240 and NGC 6000). We refer the reader to Mattila et al. (2007), Kankare et al. (2008, 2012), Väisänen et al. (2008a, 2008b), and Randriamanakoto et al. (2013) for details of observations and data reduction. 2.1. Photometry and SSC Selection The SSC candidate photometric catalo ...
Lecture 3 - University of Washington
... • The measurements show that rotation curves are “flat” – they are not ap√ proching the vc(R) ∝ 1/ R behavior expected in the outer parts of disks • Therefore, there must be an invisible galaxy component that is capable of producing gravitational force • Earlier (1930’s) suggested by Fritz Zwicky, b ...
... • The measurements show that rotation curves are “flat” – they are not ap√ proching the vc(R) ∝ 1/ R behavior expected in the outer parts of disks • Therefore, there must be an invisible galaxy component that is capable of producing gravitational force • Earlier (1930’s) suggested by Fritz Zwicky, b ...
Project 3. Colour in Astronomy
... Another reason why you obtain lower temperatures is that the Interstellar space is not a perfect vacuum. The interstellar medium (ISM) comprises cold neutral gas (H I at ≈ 70 K), warm neutral gas (H I at 6,000 K) and hot ionised plasma (H II at 10 6 K) primarily located in the plane of the galaxy in ...
... Another reason why you obtain lower temperatures is that the Interstellar space is not a perfect vacuum. The interstellar medium (ISM) comprises cold neutral gas (H I at ≈ 70 K), warm neutral gas (H I at 6,000 K) and hot ionised plasma (H II at 10 6 K) primarily located in the plane of the galaxy in ...
Glencoe Earth Science
... measured in light-years. A light-year is the distance that light travels in one year. Light travels at 300,000 km/s, or about 9.5 trillion km in one year. The nearest star to Earth, other than the Sun, is Proxima Centauri. Proxima Centauri is a mere 4.3 light-years away, or about 40 trillion km. ...
... measured in light-years. A light-year is the distance that light travels in one year. Light travels at 300,000 km/s, or about 9.5 trillion km in one year. The nearest star to Earth, other than the Sun, is Proxima Centauri. Proxima Centauri is a mere 4.3 light-years away, or about 40 trillion km. ...
The Milky Way
... C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
... C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
HR Diagram Explorer
... Check show isoradius lines. Note that at each point on a green line, stars have the same value of radius. Use these isoradius lines to check your answers in the table above. ...
... Check show isoradius lines. Note that at each point on a green line, stars have the same value of radius. Use these isoradius lines to check your answers in the table above. ...
Magnitude Scales and Photometric Systems
... of magnitude scales and photometric systems are encumbered by history. The intensity of light from stars and other cosmic objects is usually expressed in magnitudes, an inverse logarithmic scale that confuses physicists who work in SI units, but that is practical for astronomers. The apparent magnit ...
... of magnitude scales and photometric systems are encumbered by history. The intensity of light from stars and other cosmic objects is usually expressed in magnitudes, an inverse logarithmic scale that confuses physicists who work in SI units, but that is practical for astronomers. The apparent magnit ...
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.