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The Milky Way`s external disc constrained by 2MASS star counts
... galaxy formation and evolution, theories of stellar formation and evolution, models of stellar atmospheres, and dynamical constraints, in order to make a consistent picture explaining currently available observations. When scenarii of Galaxy formation and evolution are inferred from suitable constra ...
... galaxy formation and evolution, theories of stellar formation and evolution, models of stellar atmospheres, and dynamical constraints, in order to make a consistent picture explaining currently available observations. When scenarii of Galaxy formation and evolution are inferred from suitable constra ...
Paper by Bessell, Castelli and Plez on Model atmospheres
... & Castelli, in preparation). In the meantime, the last computed ATLAS9 models and fluxes are available either from [email protected] or from [email protected]. 2.2. The NMARCS models The new revised MARCS program incorporating much improved line opacities in the opacity samplin ...
... & Castelli, in preparation). In the meantime, the last computed ATLAS9 models and fluxes are available either from [email protected] or from [email protected]. 2.2. The NMARCS models The new revised MARCS program incorporating much improved line opacities in the opacity samplin ...
the PDF - Montana State University
... Sun, and by measuring the relative magnitude of the star he estimated Sirius’ distance to be about ∼28,000 AU. This underestimate already places the star incredibly far away!1 The great distance of the stars was later proven with Bessel’s geometric parallax measurement to 61 Cygni in 1838. Following ...
... Sun, and by measuring the relative magnitude of the star he estimated Sirius’ distance to be about ∼28,000 AU. This underestimate already places the star incredibly far away!1 The great distance of the stars was later proven with Bessel’s geometric parallax measurement to 61 Cygni in 1838. Following ...
Red supergiants around the obscured open cluster Stephenson 2
... AF2 uses as detector a chip mosaic, consisting of two EEV42-80 thinned and AR coated CCDs butted along their long axis to provide a 4096 × 4096 pixel detector. As the cameras are thinned, they suffer from heavy fringing in the far red spectral region (∼40%). This effect, however, can be corrected wi ...
... AF2 uses as detector a chip mosaic, consisting of two EEV42-80 thinned and AR coated CCDs butted along their long axis to provide a 4096 × 4096 pixel detector. As the cameras are thinned, they suffer from heavy fringing in the far red spectral region (∼40%). This effect, however, can be corrected wi ...
A spectroscopic investigation of the O
... 15 km s−1 for rapid rotators) and periodic. We are dealing with an SB2 if the signature of a companion whose spectral lines move in anti-phase with those of the main star is observed. Moreover, if in the cases where significant variations of the RVs are measured on all the spectral lines without any ...
... 15 km s−1 for rapid rotators) and periodic. We are dealing with an SB2 if the signature of a companion whose spectral lines move in anti-phase with those of the main star is observed. Moreover, if in the cases where significant variations of the RVs are measured on all the spectral lines without any ...
Satellite galaxies in hydrodynamical simulations of Milky Way sized
... On the theoretical side, refined treatments of the effects of reionization, often coupled to the results of high-resolution collisionless simulations have been used to model the satellite population. Macciò et al. (2010) employed a number of different semi-analytic models and low-resolution hydrodynami ...
... On the theoretical side, refined treatments of the effects of reionization, often coupled to the results of high-resolution collisionless simulations have been used to model the satellite population. Macciò et al. (2010) employed a number of different semi-analytic models and low-resolution hydrodynami ...
Silicon isotopic abundance toward evolved stars and its application
... SiC grains, for instance, types X2 and Z in Fig. 3. The type Z grains may have originated from a nearby evolved star (see also Zinner et al. 2006). Additionally, the type X grains have been proposed to have a supernova origin (e.g., Amari et al. 1992; Hoppe et al. 1994), and have two or more subgrou ...
... SiC grains, for instance, types X2 and Z in Fig. 3. The type Z grains may have originated from a nearby evolved star (see also Zinner et al. 2006). Additionally, the type X grains have been proposed to have a supernova origin (e.g., Amari et al. 1992; Hoppe et al. 1994), and have two or more subgrou ...
as a PDF file
... Germans, and von Zach even speculated that the new object might be the missing planet. However, the letters travelled slowly enough to Northern Europe that by the time the German astronomers heard of Piazzi’s discovery, the new body was too close to the Sun to observe. In fact, by summer, Bode and P ...
... Germans, and von Zach even speculated that the new object might be the missing planet. However, the letters travelled slowly enough to Northern Europe that by the time the German astronomers heard of Piazzi’s discovery, the new body was too close to the Sun to observe. In fact, by summer, Bode and P ...
Earth_Science_Standards_Review_Sheet
... Be able to explain what causes the formation of the shadow zone, and how earthquake waves have been used to infer the properties and composition of the Earth layers. Be able to identify the 3 types of seismic waves on a seismogram, and understand the properties of each wave. Be able to read a seismo ...
... Be able to explain what causes the formation of the shadow zone, and how earthquake waves have been used to infer the properties and composition of the Earth layers. Be able to identify the 3 types of seismic waves on a seismogram, and understand the properties of each wave. Be able to read a seismo ...
Exploring the Most Bizarre Ideas in Cosmology Astronomers
... really arguing that the chief property of water— fluidity—rather than literal water per se, was the real underlying principle of the universe. Everything is therefore "like" or "a form of" water rather than water in the usual sense of the word. A later Greek sage, Heraclitus, stressed the fluidity o ...
... really arguing that the chief property of water— fluidity—rather than literal water per se, was the real underlying principle of the universe. Everything is therefore "like" or "a form of" water rather than water in the usual sense of the word. A later Greek sage, Heraclitus, stressed the fluidity o ...
Stellar evolution – Part III of III - Inside Mines
... the star blows away the outer layers. The loss of atmosphere is accelerated once the hot carbon-oxygen core is exposed – a strong stellar wind blows all the atmosphere away. ...
... the star blows away the outer layers. The loss of atmosphere is accelerated once the hot carbon-oxygen core is exposed – a strong stellar wind blows all the atmosphere away. ...
act_science_bellringers
... 24. H—“ Gravity causes part of a cloud of gas and dust to collapse and heat up”; gravitational force is the only one mentioned in the passage. 25. B—“ hydrogen to make helium in a shell surrounding its center.” This answer comes straight from the passage, and the question directs you to find the ans ...
... 24. H—“ Gravity causes part of a cloud of gas and dust to collapse and heat up”; gravitational force is the only one mentioned in the passage. 25. B—“ hydrogen to make helium in a shell surrounding its center.” This answer comes straight from the passage, and the question directs you to find the ans ...
Astronomy Astrophysics - Niels Bohr Institutet
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
DUSTiNGS III: Distribution of Intermediate
... 2004c,b,a). Based on comparisons of the AGB and RGB radial profiles, these studies report the presence of both intermediate-age and older populations in the outer regions of a sub-sample of the galaxies studied. In this study, we selected the nine nearby dwarf galaxies that host > 90% of the identif ...
... 2004c,b,a). Based on comparisons of the AGB and RGB radial profiles, these studies report the presence of both intermediate-age and older populations in the outer regions of a sub-sample of the galaxies studied. In this study, we selected the nine nearby dwarf galaxies that host > 90% of the identif ...
Full-text PDF
... To make quantitative predictions for the galaxy population in a ΛCDM universe it is necessary to carry out simulations. Present numerical capabilities allow reliable simulation of the coupled nonlinear evolution of dark matter and diffuse gas, at least on the scales which determine the global proper ...
... To make quantitative predictions for the galaxy population in a ΛCDM universe it is necessary to carry out simulations. Present numerical capabilities allow reliable simulation of the coupled nonlinear evolution of dark matter and diffuse gas, at least on the scales which determine the global proper ...
Mission Possible: Voyage to the Stars
... All stars are created from a nebula but where they go after that depends on their mass. All aspects of a star including size, temperature, life history, and luminosity are determined by the original mass of the star. The HertzsprungRussell diagram is a diagram that is used by astronomers to classify ...
... All stars are created from a nebula but where they go after that depends on their mass. All aspects of a star including size, temperature, life history, and luminosity are determined by the original mass of the star. The HertzsprungRussell diagram is a diagram that is used by astronomers to classify ...
The celestial sphere
... ASTR211: COORDINATES AND TIME 2. Diurnal motion of celestial bodies Stars, planets, Sun and Moon all exhibit diurnal motion across celestial sphere. ...
... ASTR211: COORDINATES AND TIME 2. Diurnal motion of celestial bodies Stars, planets, Sun and Moon all exhibit diurnal motion across celestial sphere. ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... revealed that galaxies come in many different colours and sizes and they undergo cosmic evolution. Studies of the Milky Way and nearby galaxies helped to reveal the basic building blocks of galaxies and understand the underlying physics that connects them. In the most general sense a galaxy is a gra ...
... revealed that galaxies come in many different colours and sizes and they undergo cosmic evolution. Studies of the Milky Way and nearby galaxies helped to reveal the basic building blocks of galaxies and understand the underlying physics that connects them. In the most general sense a galaxy is a gra ...
Quantitative constraints on starburst cycles in galaxies with stellar
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...