Supernova Neutrinos
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
Beers_First_Stars_NIC_School
... High-resolution follow-up spectroscopy of a core sample of 100-200 CEMP stars, in order to assign classifications based on heavy elements, and to determine CNO, alpha elements, and other light element abundances ...
... High-resolution follow-up spectroscopy of a core sample of 100-200 CEMP stars, in order to assign classifications based on heavy elements, and to determine CNO, alpha elements, and other light element abundances ...
IR Universe
... with star formation. Stars form from collapsing clouds of gas and dust. As the cloud collapses, its density and temperature increase. The temperature and density are highest at the center of the cloud, where a new star will eventually form. The object that is formed at the center of the collapsing ...
... with star formation. Stars form from collapsing clouds of gas and dust. As the cloud collapses, its density and temperature increase. The temperature and density are highest at the center of the cloud, where a new star will eventually form. The object that is formed at the center of the collapsing ...
The cosmic distance scale
... Use the relation you found in one of the preparatory exercises and the min/max magnitudes of each Cepheid to calculate the observed mean magnitudes. These have to be corrected for interstellar extinction. The light traveling to us from M100 is not just passing through the vacuum of space, some of it ...
... Use the relation you found in one of the preparatory exercises and the min/max magnitudes of each Cepheid to calculate the observed mean magnitudes. These have to be corrected for interstellar extinction. The light traveling to us from M100 is not just passing through the vacuum of space, some of it ...
Astronomy 110 Lecture 2.
... The sky varies as Earth orbits the Sun • As the Earth orbits the Sun, the Sun appears to move eastward along the ecliptic. • At midnight, the stars on our meridian are opposite the Sun the in the sky. ...
... The sky varies as Earth orbits the Sun • As the Earth orbits the Sun, the Sun appears to move eastward along the ecliptic. • At midnight, the stars on our meridian are opposite the Sun the in the sky. ...
The Next 2-3 Weeks
... • Used these to calibrate secondary distance indicators in same galaxies. value Tully-Fisher ...
... • Used these to calibrate secondary distance indicators in same galaxies. value Tully-Fisher ...
book_text4
... telescopes to attain a higher resolution and is being vigorously developed by astronomers around the World. Such observations are highly complementary to those made by Hubble since they can exploit the collecting power of much larger telescopes and can be used very effectively to feed such light-hun ...
... telescopes to attain a higher resolution and is being vigorously developed by astronomers around the World. Such observations are highly complementary to those made by Hubble since they can exploit the collecting power of much larger telescopes and can be used very effectively to feed such light-hun ...
Full paper - The Institute of Mathematical Sciences
... medium energy resolution spectral studies and localization of Transients in soft and hard X-ray bands. • A Scanning Sky X-ray Monitor to detect and monitor Transients and known objects. • High time resolution (10 µs ) and high count rate capability ( 40 k Counts with PHA and 60 k Counts without PHA ...
... medium energy resolution spectral studies and localization of Transients in soft and hard X-ray bands. • A Scanning Sky X-ray Monitor to detect and monitor Transients and known objects. • High time resolution (10 µs ) and high count rate capability ( 40 k Counts with PHA and 60 k Counts without PHA ...
T
... Opportunity asking for the echelle spectrograph. Two fibres, an object design, construction, and pro- and a reference fibre, feed the spectrocurement of an instrument dedicated to graph with the light from the telescope and the search for extrasolar planets and aim- the calibration lamps. The fibres ...
... Opportunity asking for the echelle spectrograph. Two fibres, an object design, construction, and pro- and a reference fibre, feed the spectrocurement of an instrument dedicated to graph with the light from the telescope and the search for extrasolar planets and aim- the calibration lamps. The fibres ...
Lecture 17
... Blazars are a class of AGN that are radio sources and consist of both Optically Violent Variables (OVVs) and BL Lac objects (sources showing a featureless optical spectrum) and Flat Spectrum Radio Quasars (sources showing strong and broad emission lines) ...
... Blazars are a class of AGN that are radio sources and consist of both Optically Violent Variables (OVVs) and BL Lac objects (sources showing a featureless optical spectrum) and Flat Spectrum Radio Quasars (sources showing strong and broad emission lines) ...
TR-16
... Globular clusters are aggregations containing up to millions of stars that are gravitationally bound. Thousands of stars in each cluster are about the same age. Using an H-R diagram that compares the temperature and the luminosity of stars shows that the age of a star is inversely proportional to th ...
... Globular clusters are aggregations containing up to millions of stars that are gravitationally bound. Thousands of stars in each cluster are about the same age. Using an H-R diagram that compares the temperature and the luminosity of stars shows that the age of a star is inversely proportional to th ...
Edwin Hubble (1889
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
ISA_lecture01 - School of Physics
... A “planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial bo ...
... A “planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial bo ...
Our Local Group of Galaxies
... similar number (still being discovered). • The brightest systems have MV ~ -16 while the faintest have MV ~ -6 (new discoveries even fainter). ...
... similar number (still being discovered). • The brightest systems have MV ~ -16 while the faintest have MV ~ -6 (new discoveries even fainter). ...
ph600-12 - University of Kent
... a singular isothermal sphere as the initial state of the core that undergoes collapse, as described by Shu. We include the evolution of a first hydrostatic core at early times and allow a disk to grow, as predicted by Adams & Shu. We use a onedimensional radiative transfer code to calculate the spec ...
... a singular isothermal sphere as the initial state of the core that undergoes collapse, as described by Shu. We include the evolution of a first hydrostatic core at early times and allow a disk to grow, as predicted by Adams & Shu. We use a onedimensional radiative transfer code to calculate the spec ...
P10263v1.2 Lab 6 Text
... The Cepheid Period-Luminosity Relation). This proved enormously beneficial to astronomers, since the variation period in a light curve of a star is much easier to determine than the spectral type (the light curve period is also a much more accurate indicator of absolute luminosity, as it turns out). ...
... The Cepheid Period-Luminosity Relation). This proved enormously beneficial to astronomers, since the variation period in a light curve of a star is much easier to determine than the spectral type (the light curve period is also a much more accurate indicator of absolute luminosity, as it turns out). ...
First firm spectral classification of an early-B pre-main
... A pronounced, double-peaked emission feature is detected in the strongest H Balmer lines, the Ca ii triplet and the O i 844.6 nm line (Fig. 1). The measured peak-to-peak separation ranges from 71 ± 7 km s−1 (O ii 844.6 nm) to 105 ± 3 km s−1 (Ca ii 849.8 nm), and is centered at the rest-frame velocit ...
... A pronounced, double-peaked emission feature is detected in the strongest H Balmer lines, the Ca ii triplet and the O i 844.6 nm line (Fig. 1). The measured peak-to-peak separation ranges from 71 ± 7 km s−1 (O ii 844.6 nm) to 105 ± 3 km s−1 (Ca ii 849.8 nm), and is centered at the rest-frame velocit ...
... components are of the same order of magnitude (i.e., their ratio is larger than 1/3 but less than 3). These systems are dynamically unstable, and either evolve towards hierarchical configurations or dissolve by successive ejections of components until only a close pair remains. Internal motions in t ...
PHYS3380_102815_bw - The University of Texas at Dallas
... a) More massive clouds fragment into smaller pieces during star formation. b) Very massive stars lose mass in strong stellar winds Eddington limit - point where gravitational force can no longer balance the continuum radiation force outwards. Exceeding the Eddington limit - star initiates very inten ...
... a) More massive clouds fragment into smaller pieces during star formation. b) Very massive stars lose mass in strong stellar winds Eddington limit - point where gravitational force can no longer balance the continuum radiation force outwards. Exceeding the Eddington limit - star initiates very inten ...
Chemical Evolution
... • High abundances (1.7-2.5x solar) indicates that GCs formed rapidly before type Ia's contributed much to the gas (~1 Gyr) • However their remains puzzling patterns in how the different elemental abundances are correlated ...
... • High abundances (1.7-2.5x solar) indicates that GCs formed rapidly before type Ia's contributed much to the gas (~1 Gyr) • However their remains puzzling patterns in how the different elemental abundances are correlated ...
Star Birth - Sierra College Astronomy Home Page
... that of a planet and 0.08 MSun. • The spectral classification of a brown dwarf is T and these objects are sometimes called T dwarfs with a surface temperature of less than 1400 K • L dwarfs include brown dwarfs and hydrogen-burning stars with surface temperatures of 1400-2200 K © Sierra College Astr ...
... that of a planet and 0.08 MSun. • The spectral classification of a brown dwarf is T and these objects are sometimes called T dwarfs with a surface temperature of less than 1400 K • L dwarfs include brown dwarfs and hydrogen-burning stars with surface temperatures of 1400-2200 K © Sierra College Astr ...
Supermassive Black Holes in Inactive Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org
... holes (BHs) that accrete gas and stars and so transform gravitational potential energy into radiation. Expected BH masses are M• ~ 106–109.5M⊙. A wide array of phenomena can be understood within this picture. However, the subject has had an outstanding problem: there was no dynamical evidence that B ...
... holes (BHs) that accrete gas and stars and so transform gravitational potential energy into radiation. Expected BH masses are M• ~ 106–109.5M⊙. A wide array of phenomena can be understood within this picture. However, the subject has had an outstanding problem: there was no dynamical evidence that B ...
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.