Presentation - Relativity Group
... • temperature dictates the types of ions or molecules which exist • this, in turn, determines the number and relative strengths of absorption lines in the star’s spectrum • this fact was discovered by Cecilia Payne-Gaposchkin in 1925 ...
... • temperature dictates the types of ions or molecules which exist • this, in turn, determines the number and relative strengths of absorption lines in the star’s spectrum • this fact was discovered by Cecilia Payne-Gaposchkin in 1925 ...
Reprocessing the Hipparcos data of evolved stars
... density of a 0 mag star of 654 Jy (using the calibrations of a 0.03 mag star by Bessell & Brett 1988). The DIRBE time series data were used to calculate an average flux density for the entire data set plus the mean deviation from that average. In most cases most of the deviation is found to be due t ...
... density of a 0 mag star of 654 Jy (using the calibrations of a 0.03 mag star by Bessell & Brett 1988). The DIRBE time series data were used to calculate an average flux density for the entire data set plus the mean deviation from that average. In most cases most of the deviation is found to be due t ...
Heart of darkness: The cluster Abell 545 and its “star pile”
... (< 400kpc) f_gas~4.7% (<400 kpc) ...
... (< 400kpc) f_gas~4.7% (<400 kpc) ...
ref star birth - russballard.com
... have shadows, made of dust. They may have been sitting there quietly minding their own business when a new young star popped up nearby ... … and blasted them with stellar wind! ...
... have shadows, made of dust. They may have been sitting there quietly minding their own business when a new young star popped up nearby ... … and blasted them with stellar wind! ...
Origin_of_Elements in the stars
... the helium ashes. The result is carbon nuclei and even more heat. The "second wind" of heat release will be furious, increasing the light emitted from the future Sun's surface by a thousand fold. Meanwhile, the same heat will cause the outer layers of the present Sun to expand and form a huge "red g ...
... the helium ashes. The result is carbon nuclei and even more heat. The "second wind" of heat release will be furious, increasing the light emitted from the future Sun's surface by a thousand fold. Meanwhile, the same heat will cause the outer layers of the present Sun to expand and form a huge "red g ...
Using Atmospheric Cherenkov Telescope arrays as Intensity Interferometers S. LeBohec and J. Holder
... Citter-Zernike theorem, γd , the complex degree of coherence is the normalized Fourier transform of the source intensity distribution projected on a line parallel to the line joining the two detectors. Measuring |γd |2 provides information on the angular structure of the source. The shot noise from ...
... Citter-Zernike theorem, γd , the complex degree of coherence is the normalized Fourier transform of the source intensity distribution projected on a line parallel to the line joining the two detectors. Measuring |γd |2 provides information on the angular structure of the source. The shot noise from ...
poster
... 700 pc with a mass of 430 M⊙, but without apparent high mass stars. We want to characterize the distribution of young stellar objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength stu ...
... 700 pc with a mass of 430 M⊙, but without apparent high mass stars. We want to characterize the distribution of young stellar objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength stu ...
3D Tour of the Universe Template
... regions, resulting in the formation of new young stars. As is common in these kinds of encounters, spiral structure was induced in the more massive galaxy. M51 is an easily found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with th ...
... regions, resulting in the formation of new young stars. As is common in these kinds of encounters, spiral structure was induced in the more massive galaxy. M51 is an easily found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with th ...
"Actions and Angles", Lecture Notes for the Gaia School Mexico
... Divide up the observed stars by [α/Fe], [Fe/H] and fit each one separately Result: vertical force as a function of R (Bovy & Rix 2013) ...
... Divide up the observed stars by [α/Fe], [Fe/H] and fit each one separately Result: vertical force as a function of R (Bovy & Rix 2013) ...
Curtis/Shapley Debate – 1920 - Tufts Institute of Cosmology
... By now you know they are going to clash in a historic debate in 1920. Do you want to know who was right even before you know the issues? Was it the prodigy or the pro? OK, we'll tell you: they split. Each was right about some things and wrong about others. Shapley, the prodigy, made a monumentally c ...
... By now you know they are going to clash in a historic debate in 1920. Do you want to know who was right even before you know the issues? Was it the prodigy or the pro? OK, we'll tell you: they split. Each was right about some things and wrong about others. Shapley, the prodigy, made a monumentally c ...
The Milky Way - Faculty Web Pages
... Astronomers believe that gigantic spherical clusters of stars, called Globular Clusters, each with hundreds of thousands of stars, formed evenly around the center of the Milky Way many billions of years ago. These globular clusters are so large and bright that they can be seen from very far way – mu ...
... Astronomers believe that gigantic spherical clusters of stars, called Globular Clusters, each with hundreds of thousands of stars, formed evenly around the center of the Milky Way many billions of years ago. These globular clusters are so large and bright that they can be seen from very far way – mu ...
Chapter 12: Stellar Evolution - Otto
... there) • Central temperature reaches 108 K • Fusion of He starts abruptly - Helium flash for a few hours • Star re-adjusts over 100,000 years from stage 9 to 10 • H and He burning with C core - horizontal ...
... there) • Central temperature reaches 108 K • Fusion of He starts abruptly - Helium flash for a few hours • Star re-adjusts over 100,000 years from stage 9 to 10 • H and He burning with C core - horizontal ...
Physics of Galaxies 2016 Exercises with solutions – Batch II
... of EW(Hα) as predicted by the Yggdrasil model (Zackrisson et al. 2011, ApJ, 740. 13). As seen in Figure 2, EW(Hα) decreases with the age of the population. What is the physics behind this? The Hα emission line itself is a recombination line that forms in the photoionized gas surrounding young, hot s ...
... of EW(Hα) as predicted by the Yggdrasil model (Zackrisson et al. 2011, ApJ, 740. 13). As seen in Figure 2, EW(Hα) decreases with the age of the population. What is the physics behind this? The Hα emission line itself is a recombination line that forms in the photoionized gas surrounding young, hot s ...
Abell 1656: the Coma Cluster of galaxies - Euro-VO
... services. Each “S” corresponds to the location of a spectrum. Open the “Hubble Space Telescope Spectra” menu and click on the QSO 1257+2840 name. This opens the Data Info Frame that gives access to information about this observation. Click on “FoV in stack” and visualize the slit location on the ima ...
... services. Each “S” corresponds to the location of a spectrum. Open the “Hubble Space Telescope Spectra” menu and click on the QSO 1257+2840 name. This opens the Data Info Frame that gives access to information about this observation. Click on “FoV in stack” and visualize the slit location on the ima ...
Matter Cycle in the Interstellar Medium (ISM)
... For dark (absorbing) clouds, can use extinction method ...
... For dark (absorbing) clouds, can use extinction method ...
© Taganov I
... studies [1-5] termed Hydro-Gravitational-Dynamics (HGD). Standard cold-dark-matter hierarchicalclustering (CDMHC) cosmological models neglect critically important HGD concepts such as viscosity1, diffusion2, turbulence3, fossil turbulence4 and fossil turbulence waves5, and should be abandoned [6-10] ...
... studies [1-5] termed Hydro-Gravitational-Dynamics (HGD). Standard cold-dark-matter hierarchicalclustering (CDMHC) cosmological models neglect critically important HGD concepts such as viscosity1, diffusion2, turbulence3, fossil turbulence4 and fossil turbulence waves5, and should be abandoned [6-10] ...
Anatomy of a Supernova - hrsbstaff.ednet.ns.ca
... cal combustion theory and terrestrial experiments show that In the late 1980s a new picture combined the strengths of there are two basic types of explosion. The first is called deflaboth models. Today scientists believe tbat a Type Ia supernova gration. Deflagration waves are subsonic and act like ...
... cal combustion theory and terrestrial experiments show that In the late 1980s a new picture combined the strengths of there are two basic types of explosion. The first is called deflaboth models. Today scientists believe tbat a Type Ia supernova gration. Deflagration waves are subsonic and act like ...
Birth, Lives, and Death of Stars
... If the core mass is between 1.4 and 3 solar masses, the compression from the star's gravity will be so great the protons fuse with the electrons to form neutrons. The core becomes a super-dense ball of neutrons. Only the rare, massive stars will form these remnants in a supernova explosion. Neutrons ...
... If the core mass is between 1.4 and 3 solar masses, the compression from the star's gravity will be so great the protons fuse with the electrons to form neutrons. The core becomes a super-dense ball of neutrons. Only the rare, massive stars will form these remnants in a supernova explosion. Neutrons ...
(r) and
... Stellar absorption lines are faint and long exposure times are required to collect the necessary signal-to-noise. For instance, it would take the Hubble Space Telescope more than 100 orbits (more than any TAC would allocate to the project) to obtain spectra suitable for stellar dynamical studies i ...
... Stellar absorption lines are faint and long exposure times are required to collect the necessary signal-to-noise. For instance, it would take the Hubble Space Telescope more than 100 orbits (more than any TAC would allocate to the project) to obtain spectra suitable for stellar dynamical studies i ...
Introduction Introduction to to Astrophysics Astrophysics
... be sucked down by the newly-formed super-massive central black hole of the new system. ...
... be sucked down by the newly-formed super-massive central black hole of the new system. ...
The evolution of helium rich subdwarf B stars
... • Subdwarf B stars form the dominant population of faint blue blue stars (mB ~ 16) in our galaxy and giant elliptical galaxies • They are 0.5 MSun core helium-burning stars • Progenitors of White Dwarfs • Evolution has been the subject of much debate although evolution is though to play an important ...
... • Subdwarf B stars form the dominant population of faint blue blue stars (mB ~ 16) in our galaxy and giant elliptical galaxies • They are 0.5 MSun core helium-burning stars • Progenitors of White Dwarfs • Evolution has been the subject of much debate although evolution is though to play an important ...
Contrast the old definition of constellation with the
... If all stars are circumpolar if you lived at the north pole, and all stars rise and set if you lived on the equator, what can you state about the motion of stars if you lived in between the north pole and the equator? ...
... If all stars are circumpolar if you lived at the north pole, and all stars rise and set if you lived on the equator, what can you state about the motion of stars if you lived in between the north pole and the equator? ...
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.