Galaxy / Cluster Ecosystem Ming Sun (University of Alabama in Huntsville)
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
Lives of the Stars Lecture 5: Star birth
... half the mass of the Sun would take around 150 million years. As we will see next week, this is longer than the lifetimes of massive stars, which means that massive stars forming in a cluster can collapse onto the main sequence, complete their hydrogen burning and finish their lives before a low mas ...
... half the mass of the Sun would take around 150 million years. As we will see next week, this is longer than the lifetimes of massive stars, which means that massive stars forming in a cluster can collapse onto the main sequence, complete their hydrogen burning and finish their lives before a low mas ...
Entropy
... calculations are extremely important for our understanding of the physics of the world around us. So, stars are the most common objects in the Universe, they contain more than 97% of the mass of all visible matter. But what is their entropy production, how does it depend on the type of a star, on th ...
... calculations are extremely important for our understanding of the physics of the world around us. So, stars are the most common objects in the Universe, they contain more than 97% of the mass of all visible matter. But what is their entropy production, how does it depend on the type of a star, on th ...
Early stages of clustered star formation -massive dark clouds
... is confined to giant molecular clouds. The clouds are held together by self-gravity rather than being in equilibrium with the other phases. Molecular clouds represent the locations in the Galaxy where the star-formation process is initiated. Even to the naked eye, some nearby molecular clouds are vi ...
... is confined to giant molecular clouds. The clouds are held together by self-gravity rather than being in equilibrium with the other phases. Molecular clouds represent the locations in the Galaxy where the star-formation process is initiated. Even to the naked eye, some nearby molecular clouds are vi ...
A Universe of Galaxies - Pennsylvania State University
... The first active galaxies: Quasars In 1962, a radio survey of the entire sky revealed a few peculiar “stars” that were very bright at radio wavelengths (normal stars do not produce much radio emission). They were named quasistellar radio sources (quasars, or QSOs): ...
... The first active galaxies: Quasars In 1962, a radio survey of the entire sky revealed a few peculiar “stars” that were very bright at radio wavelengths (normal stars do not produce much radio emission). They were named quasistellar radio sources (quasars, or QSOs): ...
Star formation and internal kinematics of irregular galaxies
... (a few times) the local scale height. In most cases this is a few hundred parsecs. This is the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of ki ...
... (a few times) the local scale height. In most cases this is a few hundred parsecs. This is the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of ki ...
Star 1 A star is a massive, luminous ball of plasma held together by
... 11th century, the Persian polymath scholar Abu Rayhan Biruni described the Milky Way galaxy as a multitude of fragments having the properties of nebulous stars, and also gave the latitudes of various stars during a lunar eclipse in 1019.[21] The Andalusian astronomer Ibn Bajjah proposed that the Mil ...
... 11th century, the Persian polymath scholar Abu Rayhan Biruni described the Milky Way galaxy as a multitude of fragments having the properties of nebulous stars, and also gave the latitudes of various stars during a lunar eclipse in 1019.[21] The Andalusian astronomer Ibn Bajjah proposed that the Mil ...
Impact on stellar properties of changing physics SAC Summer
... The resulting energy release occurs almost explosively. However, most of the energy is absorbed by the overlying layers of the envelope, which in the end causes some mass loss. This short-lived phase of evolution of low mass stars is referred to as the helium core flash. In more massive stars, the c ...
... The resulting energy release occurs almost explosively. However, most of the energy is absorbed by the overlying layers of the envelope, which in the end causes some mass loss. This short-lived phase of evolution of low mass stars is referred to as the helium core flash. In more massive stars, the c ...
Enhanced lithium depletion in Sun-like stars with orbiting planets.
... 451 stars in the HARPS high precision (better than 1 m/s) radial velocity exoplanet survey11 spanning the effective temperature range between 4900 and 6500 K. These are unevolved, slowly rotating non-active stars from a CORALIE catalogue11. These stars have been monitored with high precision spectro ...
... 451 stars in the HARPS high precision (better than 1 m/s) radial velocity exoplanet survey11 spanning the effective temperature range between 4900 and 6500 K. These are unevolved, slowly rotating non-active stars from a CORALIE catalogue11. These stars have been monitored with high precision spectro ...
Stellar Explosions
... A high-mass star continues to fuse elements in its core up to iron (after which the fusion reaction is energetically unfavored) As heavier elements are fused the reactions go faster and each stage is over more quickly A 20-solar-mass star will burn carbon for about 10,000 years, but its iron core la ...
... A high-mass star continues to fuse elements in its core up to iron (after which the fusion reaction is energetically unfavored) As heavier elements are fused the reactions go faster and each stage is over more quickly A 20-solar-mass star will burn carbon for about 10,000 years, but its iron core la ...
THE DAWN OF X-RAY ASTRONOMY
... in 1972 that black holes would have masses greater than 3.4 times the mass of the Sun (Rhoades and Ruffini, 1974).27 Thus we could reach conclusions regarding Cyg X–1: the Cyg X–1 x–ray emitter is a compact object of less than 30 km radius due to the rapidity of the pulsations and the fact that the ...
... in 1972 that black holes would have masses greater than 3.4 times the mass of the Sun (Rhoades and Ruffini, 1974).27 Thus we could reach conclusions regarding Cyg X–1: the Cyg X–1 x–ray emitter is a compact object of less than 30 km radius due to the rapidity of the pulsations and the fact that the ...
Open clusters in the Third Galactic Quadrant III. Alleged binary
... members, some sequences are not satisfactorily reproduced by one single isochrone, as said above, and a range of them has been indicated in each cluster of Table 4. Known reasons to fail the fitting include the effect of un-resolved binaries, stellar rotation and variable reddening due to remaining m ...
... members, some sequences are not satisfactorily reproduced by one single isochrone, as said above, and a range of them has been indicated in each cluster of Table 4. Known reasons to fail the fitting include the effect of un-resolved binaries, stellar rotation and variable reddening due to remaining m ...
Module 5 Modelling the universe - Pearson Schools and FE Colleges
... and hence an increase in temperature and therefore pressure of the core. The huge pressure in the core will cause the entire Sun to grow. It will gradually absorb into itself Mercury, Venus and, in time, Earth. The surface temperature of this massive star will be much lower than now. It will become ...
... and hence an increase in temperature and therefore pressure of the core. The huge pressure in the core will cause the entire Sun to grow. It will gradually absorb into itself Mercury, Venus and, in time, Earth. The surface temperature of this massive star will be much lower than now. It will become ...
No Slide Title
... What is the ratio that expresses the rate of apparent expansion of the universe, equal to the velocity at which a typical galaxy is receding from Earth and is divided by its distance from Earth? ...
... What is the ratio that expresses the rate of apparent expansion of the universe, equal to the velocity at which a typical galaxy is receding from Earth and is divided by its distance from Earth? ...
pierrehumbert_lecture_1
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... We have gathered and analysed a timeseries of 1493 high-quality multicilour Geneva photometric data of the B3V Cep star HD 129929. The dataset has a time base of 21.2 years. The occurrence of a beating phenomenon is evident from the data. We find evidence for the presence of at least six frequencies ...
... We have gathered and analysed a timeseries of 1493 high-quality multicilour Geneva photometric data of the B3V Cep star HD 129929. The dataset has a time base of 21.2 years. The occurrence of a beating phenomenon is evident from the data. We find evidence for the presence of at least six frequencies ...
What Are the Faint X-ray Transients Near the Galactic Center?
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
Entropy Production of Main-Sequence Stars
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
Homologous Stellar Models and Polytropes Main Sequence Stars
... • Red Dwarfs are stars whose main-sequence lifetime exceeds the present age of the Universe estimated as 1.37 × 1010 years. Models yield an upper mass limit (0.7M for stars that must still be on the Main Sequence, even if they are as old as the Universe. • Low-Mass Stars (0.7 6 M 6 2M ) in most cas ...
... • Red Dwarfs are stars whose main-sequence lifetime exceeds the present age of the Universe estimated as 1.37 × 1010 years. Models yield an upper mass limit (0.7M for stars that must still be on the Main Sequence, even if they are as old as the Universe. • Low-Mass Stars (0.7 6 M 6 2M ) in most cas ...
Type II Supernovae
... oxides, depleting the ozone layer which increases surface exposure to solar and cosmic radiation. ...
... oxides, depleting the ozone layer which increases surface exposure to solar and cosmic radiation. ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.