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Magnetars origin and progenitors with enhanced rotation'
... Magnetars origin and progenitors with enhanced rotation S.B. Popov, M.E. Prokhorov (Sternberg Astronomical Institute) ...
... Magnetars origin and progenitors with enhanced rotation S.B. Popov, M.E. Prokhorov (Sternberg Astronomical Institute) ...
STELLAR AGE VERSUS MASS OF EARLY
... realistic population – with a finite duration of star formation rather than a delta-peak – can never become so red, since not all of its stars reach this period at the same time. Indeed, the model population that formed from a single burst of finite length lies within the observed color range, altho ...
... realistic population – with a finite duration of star formation rather than a delta-peak – can never become so red, since not all of its stars reach this period at the same time. Indeed, the model population that formed from a single burst of finite length lies within the observed color range, altho ...
Binocular Certificate Handbook
... is the abode of galaxies, nebulae, and stars in many guises. It is here that we set sail from Earth and are transported across many light years of space to the wonderful and the exotic; dense glowing clouds of gas where new suns are being born, star-studded sections of the Milky Way, and the ghostly ...
... is the abode of galaxies, nebulae, and stars in many guises. It is here that we set sail from Earth and are transported across many light years of space to the wonderful and the exotic; dense glowing clouds of gas where new suns are being born, star-studded sections of the Milky Way, and the ghostly ...
Star formation in a galactic outflow
... population with kinematical fingerprints of formation inside the outflow. The stellar continuum is detected in the X-shooter spectra out to about 5 kpc from the nucleus, and its shape and stellar features do indeed indicate the presence of a young stellar population younger than a few tens of millio ...
... population with kinematical fingerprints of formation inside the outflow. The stellar continuum is detected in the X-shooter spectra out to about 5 kpc from the nucleus, and its shape and stellar features do indeed indicate the presence of a young stellar population younger than a few tens of millio ...
to - NexStar Resource Site
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
12-1 - Piscataway High School
... convenient to use astronomical units. As Reasoning with Numbers 12-1 explains, when you measure distance via parallax, it is convenient to use the unit of distance called a parsec (pc). The word parsec was created by combining parallax and second of arc. One parsec equals the distance to an imaginar ...
... convenient to use astronomical units. As Reasoning with Numbers 12-1 explains, when you measure distance via parallax, it is convenient to use the unit of distance called a parsec (pc). The word parsec was created by combining parallax and second of arc. One parsec equals the distance to an imaginar ...
Period analysis of variable stars by robust smoothing
... From the fact that smoothing spline regression can be severely affected by outliers, RCV(p) might be much less sensitive than GCV(p) of (4) with a least squares smoothing spline when data are perturbed by outliers. RCV(p) score (not shown) for the data in Figure 1-(a) has a global minimum at 0.8764. ...
... From the fact that smoothing spline regression can be severely affected by outliers, RCV(p) might be much less sensitive than GCV(p) of (4) with a least squares smoothing spline when data are perturbed by outliers. RCV(p) score (not shown) for the data in Figure 1-(a) has a global minimum at 0.8764. ...
The evolution of dwarf galaxy satellites with different dark matter
... Dwarf galaxy satellites of the Milky Way (MW) and M31 are the main focus of ”near-field cosmology”, providing a plethora of useful constraints and tests for galaxy formation theories as well as for the nature of dark matter in the ΛCDM paradigm. Yet their origin is still not completely understood. N ...
... Dwarf galaxy satellites of the Milky Way (MW) and M31 are the main focus of ”near-field cosmology”, providing a plethora of useful constraints and tests for galaxy formation theories as well as for the nature of dark matter in the ΛCDM paradigm. Yet their origin is still not completely understood. N ...
Two extremely luminous WN stars in the Galactic center with
... and contains many OB-type stars, the more evolved Quintuplet cluster (3–5 Myr old) harbors many Wolf-Rayet (WR) stars. Besides these compact stellar conglomerates, many high-mass stars whose association with stellar clusters is not obvious are scattered in the GC. Among these are the rather isolated ...
... and contains many OB-type stars, the more evolved Quintuplet cluster (3–5 Myr old) harbors many Wolf-Rayet (WR) stars. Besides these compact stellar conglomerates, many high-mass stars whose association with stellar clusters is not obvious are scattered in the GC. Among these are the rather isolated ...
Chemical tagging of three distinct populations of red giants in the
... A check with spectrum synthesis confirmed the reliability of our measurements. We use here LTE abundances. Andrievsky et al. (2008) computed N-LTE corrections for Al for very metal-poor stars, considering also the doublet used here. From their Fig. 2 the maximun differential effect for stars with te ...
... A check with spectrum synthesis confirmed the reliability of our measurements. We use here LTE abundances. Andrievsky et al. (2008) computed N-LTE corrections for Al for very metal-poor stars, considering also the doublet used here. From their Fig. 2 the maximun differential effect for stars with te ...
Type Ia supernovae as stellar endpoints and cosmological tools
... because dark energy is so dilute (1 m3 contains the energy equivalent to a few atoms of hydrogen), its effects can only be seen on vast scales. We must compare supernovae across ~10 Gyr of cosmic time, during which stars and galaxies have undergone substantial evolution. Therefore, it is critical to ...
... because dark energy is so dilute (1 m3 contains the energy equivalent to a few atoms of hydrogen), its effects can only be seen on vast scales. We must compare supernovae across ~10 Gyr of cosmic time, during which stars and galaxies have undergone substantial evolution. Therefore, it is critical to ...
Exploring Neutral Hydrogen and Galaxy Evolution with the SKA
... Observations of H I in galaxies in very dense environments (a well studied example is the Virgo cluster (Chung et al. (2009)) demonstrate the importance of the environment. The growing inventory of detailed H I observations of galaxies in different environments is mixed, but suggest that even interm ...
... Observations of H I in galaxies in very dense environments (a well studied example is the Virgo cluster (Chung et al. (2009)) demonstrate the importance of the environment. The growing inventory of detailed H I observations of galaxies in different environments is mixed, but suggest that even interm ...
Homogeneity and isotropy in the 2MASS Photometric Redshift
... This is a well known result: as we increase the depth of the survey, we increase the chance that pairs of galaxies that are distant from each other (and therefore uncorrelated) will subtend small angles, thus decreasing the amplitude of the angular correlation function. Traditionally the scaling rel ...
... This is a well known result: as we increase the depth of the survey, we increase the chance that pairs of galaxies that are distant from each other (and therefore uncorrelated) will subtend small angles, thus decreasing the amplitude of the angular correlation function. Traditionally the scaling rel ...
The Gould Belt
... Torra, et al. [30], have analyzed the extensive HIPPARCOS sample of stars in spectral classes O and B that lie within a radius of r < 2.0 kpc of the sun. The individual age of 2864 stars was estimated by Strömgren photometry. The relative error in the age determination for 88% of the stars in the s ...
... Torra, et al. [30], have analyzed the extensive HIPPARCOS sample of stars in spectral classes O and B that lie within a radius of r < 2.0 kpc of the sun. The individual age of 2864 stars was estimated by Strömgren photometry. The relative error in the age determination for 88% of the stars in the s ...
The Final Version of the White Paper is available.
... The discovery almost 20 years ago of the first giant planet outside of the solar system (Mayor & Queloz 1995) spawned a real revolution in astronomy. The completely unexpected characteristics of this first planet captured the imagination and interest of the scientific community and the general publi ...
... The discovery almost 20 years ago of the first giant planet outside of the solar system (Mayor & Queloz 1995) spawned a real revolution in astronomy. The completely unexpected characteristics of this first planet captured the imagination and interest of the scientific community and the general publi ...
Entropy Production of Stars
... be noted that the quantity of entropy production is convenient from the standpoint of theory and calculations but not always easy to determine in experiments: it is measured only indirectly and special conditions of a nonequilibrium system are preferable (for example, isolated or stationary). All th ...
... be noted that the quantity of entropy production is convenient from the standpoint of theory and calculations but not always easy to determine in experiments: it is measured only indirectly and special conditions of a nonequilibrium system are preferable (for example, isolated or stationary). All th ...
Introduction
... volume and mass limited, and includes galaxies of all morphological types inhabiting a range of different environments, from galaxies in the dense core of the Virgo cluster to relatively isolated systems. As such, the sample is ideal for disentangling the internal and environmental processes driving ...
... volume and mass limited, and includes galaxies of all morphological types inhabiting a range of different environments, from galaxies in the dense core of the Virgo cluster to relatively isolated systems. As such, the sample is ideal for disentangling the internal and environmental processes driving ...
Potassium abundances in nearby metal-poor stars
... for warm subgiant stars is similar to the sodium NLTE studies (eg. Shi et al. 2004). As expected, stronger departures from LTE are found for stars with high temperature, which is in agreement with the statistical equilibrium of sodium, magnesium and aluminium (Gehren et al. 2004, 2006). The reductio ...
... for warm subgiant stars is similar to the sodium NLTE studies (eg. Shi et al. 2004). As expected, stronger departures from LTE are found for stars with high temperature, which is in agreement with the statistical equilibrium of sodium, magnesium and aluminium (Gehren et al. 2004, 2006). The reductio ...
1998 - Universitäts-Sternwarte München
... that they do not take share in the rotation of the Galactic disk, i.e. they constitute a different stellar population, which provides important clues for scenarios of the early epochs. With the rapidly increased number of observations, the more sophisticated theories, and the very much improved nume ...
... that they do not take share in the rotation of the Galactic disk, i.e. they constitute a different stellar population, which provides important clues for scenarios of the early epochs. With the rapidly increased number of observations, the more sophisticated theories, and the very much improved nume ...
25 Years of the Hubble Space Telescope - Speaker
... As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Camera for Surveys. It is a 50-light-year-wide view of the central region of the Carina Nebula, where a mae ...
... As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Camera for Surveys. It is a 50-light-year-wide view of the central region of the Carina Nebula, where a mae ...
Star formation in luminous quasar host galaxies at z = 1–2 ⋆
... rest-frame U images of 17 ∼L quasars at z ≈ 1 and 2 (V and I bands, respectively), designed to explore the host galaxies. We fit the images with simple axisymmetric galaxy models, including a point source, in order to separate nuclear and host-galaxy emission. We successfully model all of the host ...
... rest-frame U images of 17 ∼L quasars at z ≈ 1 and 2 (V and I bands, respectively), designed to explore the host galaxies. We fit the images with simple axisymmetric galaxy models, including a point source, in order to separate nuclear and host-galaxy emission. We successfully model all of the host ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
On the Spiral Structure of the Milky Way Galaxy
... That the Milky Way system is a spiral galaxy has long been beyond doubt, but the positions and number of the spiral arms remain a matter of debate. Spiral-arm tracers are well known: the arms concentrate the most massive gas clouds and young stars and clusters. Distances to these latter objects can ...
... That the Milky Way system is a spiral galaxy has long been beyond doubt, but the positions and number of the spiral arms remain a matter of debate. Spiral-arm tracers are well known: the arms concentrate the most massive gas clouds and young stars and clusters. Distances to these latter objects can ...
Objective Classification of Galaxy Spectra using the Information Bottleneck Method
... populations, and eventually to gain clues as to their physical origin. Traditional methods of classifying galaxies \by eye" are clearly impractical in this context. The analysis and full exploitation of such data sets require well justi ed, automated and objective techniques to extract as much infor ...
... populations, and eventually to gain clues as to their physical origin. Traditional methods of classifying galaxies \by eye" are clearly impractical in this context. The analysis and full exploitation of such data sets require well justi ed, automated and objective techniques to extract as much infor ...
On the onset of runaway stellar collisions in dense star clusters I
... Here N IMF (m) is the initial mass function and hmIMF i is the average mass of the initial mass function. This expression is presented as the thick solid line in Fig. 3. Equation 1 implies that for stars more massive than ∼ 2hmIMF i the slope of the mass function flattens. This is not unexpected sin ...
... Here N IMF (m) is the initial mass function and hmIMF i is the average mass of the initial mass function. This expression is presented as the thick solid line in Fig. 3. Equation 1 implies that for stars more massive than ∼ 2hmIMF i the slope of the mass function flattens. This is not unexpected sin ...
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.