Discovery of extremely lead-rich subdwarfs: does heavy metal signal
... Hot subdwarfs represent a group of low-mass helium-burning stars formed through binarystar interactions and include some of the most chemically peculiar stars in the Galaxy. Stellar evolution theory suggests that they should have helium-rich atmospheres but, because radiation causes hydrogen to diff ...
... Hot subdwarfs represent a group of low-mass helium-burning stars formed through binarystar interactions and include some of the most chemically peculiar stars in the Galaxy. Stellar evolution theory suggests that they should have helium-rich atmospheres but, because radiation causes hydrogen to diff ...
Binary Stars
... seconds to hours to thousands of years They may contain stars of all kinds, sizes, and masses They may have circular or elliptical orbits They are believed to have formed together same age (not capture) Close binaries affect each other’s evolution Long period binaries essentially act as single stars ...
... seconds to hours to thousands of years They may contain stars of all kinds, sizes, and masses They may have circular or elliptical orbits They are believed to have formed together same age (not capture) Close binaries affect each other’s evolution Long period binaries essentially act as single stars ...
Condensates in Neutron Star Interiors
... later, in 1731, John Bevis discovered the supernova remnant, which was later christened the Crab nebula (or M1, the first entry in the Messier catalogue). Finally, in 1968, a radio wave source was discovered in the nebula which pulsates with a period of 33 ms. The source was characterized as a compa ...
... later, in 1731, John Bevis discovered the supernova remnant, which was later christened the Crab nebula (or M1, the first entry in the Messier catalogue). Finally, in 1968, a radio wave source was discovered in the nebula which pulsates with a period of 33 ms. The source was characterized as a compa ...
GRAVITY: Observing the Universe in Motion
... of the key experiments that will become possible with GRAVITY is illustrated on the Telescopes and Instrumentation section page (p. 6, lower panel). A unique combination with the VLTI The VLTI is the largest array of 8-metreclass telescopes that explicitly included interferometry in its design and i ...
... of the key experiments that will become possible with GRAVITY is illustrated on the Telescopes and Instrumentation section page (p. 6, lower panel). A unique combination with the VLTI The VLTI is the largest array of 8-metreclass telescopes that explicitly included interferometry in its design and i ...
Absolute magnitudes and kinematics of barium
... characterized by the following pdfs: a gaussian law for the absolute magnitude (M0 , σM ), a Schwarzschild ellipsoid velocity distribution (U0 , V0 , W0 , σU , σV , σW ) and an exponential-disk spatial distribution (Z0 being the scale height in the direction perpendicular to the galactic plane). The ...
... characterized by the following pdfs: a gaussian law for the absolute magnitude (M0 , σM ), a Schwarzschild ellipsoid velocity distribution (U0 , V0 , W0 , σU , σV , σW ) and an exponential-disk spatial distribution (Z0 being the scale height in the direction perpendicular to the galactic plane). The ...
The Gaseous Halo of NGC 891 Edmund Hodges-Kluck Joel Bregman
... • Are metals in the hot gas depleted onto dust? • Did a small amount of accretion trigger a large amount of star formation (halo may not be in a steady state)? • … are they unrelated? ...
... • Are metals in the hot gas depleted onto dust? • Did a small amount of accretion trigger a large amount of star formation (halo may not be in a steady state)? • … are they unrelated? ...
Titelseite
... • Gamma spectroscopy has many advantages compared with optical measurements, especially when detecting super nova related data: the decays are not affected by the heat- or mass density, and while optical methods are affected by the shell structure of supernovae (several months can pass until the cor ...
... • Gamma spectroscopy has many advantages compared with optical measurements, especially when detecting super nova related data: the decays are not affected by the heat- or mass density, and while optical methods are affected by the shell structure of supernovae (several months can pass until the cor ...
Dust Coagulation in the Solar Nebula using the Grand Tack Model
... particles are colliding with each other, coagulating to form dust aggregates. The dust aggregates that formed will later on form larger more porous objects and then chondrules. The exact evolution of the dust depends on the collisions made i.e. dust with aggregates and aggregates with aggregates [1] ...
... particles are colliding with each other, coagulating to form dust aggregates. The dust aggregates that formed will later on form larger more porous objects and then chondrules. The exact evolution of the dust depends on the collisions made i.e. dust with aggregates and aggregates with aggregates [1] ...
How Cosmic Clocks Tick - Max-Planck
... holes and exploding stars (supernovae). The radio astronomers in Bonn, in collaboration with colleagues from around the world working on the Pulsar Timing Array, want to expand this range on the order of nanohertz – that is, at wavelengths of tens of light-years. Here, the researchers are expecting ...
... holes and exploding stars (supernovae). The radio astronomers in Bonn, in collaboration with colleagues from around the world working on the Pulsar Timing Array, want to expand this range on the order of nanohertz – that is, at wavelengths of tens of light-years. Here, the researchers are expecting ...
Formation and Evolution of Binary Millisecond Pulsars with Helium
... binary system is inherently five dimensional. The vector of parameter space contains the following elements: (i) the initial mass of the donor (M2,o ); (ii) the initial mass of the accretor (M1,o ); (iii) the initial chemical profile of the interior of the donor star (which can be correlated with it ...
... binary system is inherently five dimensional. The vector of parameter space contains the following elements: (i) the initial mass of the donor (M2,o ); (ii) the initial mass of the accretor (M1,o ); (iii) the initial chemical profile of the interior of the donor star (which can be correlated with it ...
AN ATTEMPT To prove the MOTION OF THE EARTH FROM
... since we now find by observations, that of those which are accounted single Stars, divers prove a congeries of many Stars, though from their near appearing to each other, the na ked eye cannot distinguish them; Such as those Stars which are calledNebulous, and those in Orion Sword, and that in the h ...
... since we now find by observations, that of those which are accounted single Stars, divers prove a congeries of many Stars, though from their near appearing to each other, the na ked eye cannot distinguish them; Such as those Stars which are calledNebulous, and those in Orion Sword, and that in the h ...
SM_Taurus - Cloudy Nights
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
Flatfielding chapter for Calibration Volumes
... calibration stars over the focal plane. But the large number of pixels on the SNAP focal plane, roughly half a billion, makes this approach very costly in time. There are also other significant advantages to the RoF. First, high frequency flat fielding can be done routinely and quickly. Second, the ...
... calibration stars over the focal plane. But the large number of pixels on the SNAP focal plane, roughly half a billion, makes this approach very costly in time. There are also other significant advantages to the RoF. First, high frequency flat fielding can be done routinely and quickly. Second, the ...
SherwoodWA_1973redux - Edinburgh Research Archive
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
STELLAR MASSES AND STAR FORMATION RATES OF LENSED DUSTY STAR-FORMING... FROM THE SPT SURVEY
... a population of high-redshift dusty star-forming galaxies (DSFGs) has been established, expanding our understanding of galaxy formation and evolution. These massive galaxies (M∗ ∼ 1011 M⊙ ; Hainline et al. 2011; Michalowski et al. 2012; Simpson et al. 2014) are extremely bright at submillimeter wave ...
... a population of high-redshift dusty star-forming galaxies (DSFGs) has been established, expanding our understanding of galaxy formation and evolution. These massive galaxies (M∗ ∼ 1011 M⊙ ; Hainline et al. 2011; Michalowski et al. 2012; Simpson et al. 2014) are extremely bright at submillimeter wave ...
The Transit Method
... de France. The sky was clear but he could not make measurements due to the motion of the ship. Coming this far he decided to just wait for the next transit in 8 years. He then mapped the eastern coast of Madagascar and decided to observe the second transit from Manilla in the Philippines. The Spanis ...
... de France. The sky was clear but he could not make measurements due to the motion of the ship. Coming this far he decided to just wait for the next transit in 8 years. He then mapped the eastern coast of Madagascar and decided to observe the second transit from Manilla in the Philippines. The Spanis ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.