Hot Horizontal Branch Stars in the Galactic Bulge. I
... detected in at least three frames on each filter were kept and the others discarded. Photometric calibration was based on a series of U BV images obtained for an overlapping field on the photometric night of 1995 June 1 UT. These calibration frames were offset from the target field by 7′ in right as ...
... detected in at least three frames on each filter were kept and the others discarded. Photometric calibration was based on a series of U BV images obtained for an overlapping field on the photometric night of 1995 June 1 UT. These calibration frames were offset from the target field by 7′ in right as ...
Modelling the Ultra-Faint Dwarf Galaxies and Tidal
... Before(A), while (B) Both models show high velocity dispersion after dissolution [c] C:&no density enhancement, low , C Mean vrad is patchy with gradient (B) vs. constant within object (D) gradient in vrad D ...
... Before(A), while (B) Both models show high velocity dispersion after dissolution [c] C:&no density enhancement, low , C Mean vrad is patchy with gradient (B) vs. constant within object (D) gradient in vrad D ...
Quiescent and flaring X-ray emission from the nearby M/T dwarf
... (see e.g. Mohanty & Basri 2003; Audard et al. 2007). Thus at the very end of the stellar main sequence the full range of X-ray activity levels as observed for more massive magnetically active stars, i.e. log LX /Lbol = −3 ... − 7, is likely also present; however, high activity levels persist in late ...
... (see e.g. Mohanty & Basri 2003; Audard et al. 2007). Thus at the very end of the stellar main sequence the full range of X-ray activity levels as observed for more massive magnetically active stars, i.e. log LX /Lbol = −3 ... − 7, is likely also present; however, high activity levels persist in late ...
the inclination of the dwarf irregular galaxy
... Recent studies indicate that galactic disks stabilize to a constant stability parameter across the optical galaxy (Meurer et al. 2013; Zheng et al. 2013), lending support to the phenomenon of self-regulation by star formation, as suggested by Quirk (1972). However, although the value of the Qg -para ...
... Recent studies indicate that galactic disks stabilize to a constant stability parameter across the optical galaxy (Meurer et al. 2013; Zheng et al. 2013), lending support to the phenomenon of self-regulation by star formation, as suggested by Quirk (1972). However, although the value of the Qg -para ...
20. Meteorites and the chemical evolution of the Milky Way
... and metallicity. Moreover, there are still large uncertainties in the predicted yields due to uncertainties in the stellar evolution physics and nuclear reaction cross sections. A key concept related to stellar yields is the definition of primary and secondary species. A primary specie is one that c ...
... and metallicity. Moreover, there are still large uncertainties in the predicted yields due to uncertainties in the stellar evolution physics and nuclear reaction cross sections. A key concept related to stellar yields is the definition of primary and secondary species. A primary specie is one that c ...
Galaxy Spiral Arms
... Keplerian calculations are the absolute starting point, and then they find various ways, such as there being an extremely massive but invisible halo of dark matter surrounding the Galaxy, to explain the observed data. Since this is the case, essentially all Papers start off by assuming either of two ...
... Keplerian calculations are the absolute starting point, and then they find various ways, such as there being an extremely massive but invisible halo of dark matter surrounding the Galaxy, to explain the observed data. Since this is the case, essentially all Papers start off by assuming either of two ...
Supernova neutrinos at ICARUS
... prompt e burst 1051 erg in #10 msec other flavor (anti)neutrino energy and luminosities raises when shock stalls and matter accretes (100 ms) 10% - 25% of the total luminosity in 0.5 sec Formed protoneutron star cooling 90% -75% of ...
... prompt e burst 1051 erg in #10 msec other flavor (anti)neutrino energy and luminosities raises when shock stalls and matter accretes (100 ms) 10% - 25% of the total luminosity in 0.5 sec Formed protoneutron star cooling 90% -75% of ...
don_lamb - New Views of the Universe
... Dominant timescale is set by jet propagation through collapsing core (~10-20 s) ...
... Dominant timescale is set by jet propagation through collapsing core (~10-20 s) ...
Rich Clusters of Galaxies
... They have four major components: 1. hundreds or thousands of galaxies each containing stars, gas and dust 2. vast amounts of hot gas (visible via x-rays) with a temperature of 3x107 - 108 K. 3. intergalactic magnetic fields of poorly known strength and distribution 4. dark matter, (non-luminous matt ...
... They have four major components: 1. hundreds or thousands of galaxies each containing stars, gas and dust 2. vast amounts of hot gas (visible via x-rays) with a temperature of 3x107 - 108 K. 3. intergalactic magnetic fields of poorly known strength and distribution 4. dark matter, (non-luminous matt ...
Polaris
... nighttime sky, as is commonly believed. It’s only about 50th brightest. But you can find it easily, and, once you do, you’ll see it shining in the northern sky every night, from N. Hemisphere locations. ***In the Northern Hemisphere, the altitude of Polaris is equal to the observer’s latitude. In th ...
... nighttime sky, as is commonly believed. It’s only about 50th brightest. But you can find it easily, and, once you do, you’ll see it shining in the northern sky every night, from N. Hemisphere locations. ***In the Northern Hemisphere, the altitude of Polaris is equal to the observer’s latitude. In th ...
The 2008 RBSE Journal - National Optical Astronomy Observatory
... A Double Radio Source Associated with a Galactic Nucleus (DRAGN) is a radio source that is produced by jets produced by active galactic nucleus that is not in the Milky Way. This happens when an accretion disk forms around a black hole and spins, converts gravitational and rotational energy into exc ...
... A Double Radio Source Associated with a Galactic Nucleus (DRAGN) is a radio source that is produced by jets produced by active galactic nucleus that is not in the Milky Way. This happens when an accretion disk forms around a black hole and spins, converts gravitational and rotational energy into exc ...
Stars
... Just first 2 minutes https://www.youtube.com/watch?v=01U7ZUKVW8o https://www.youtube.com/watch?v=N3IgVidGjQk https://www.youtube.com/watch?v=Rj1sDWjvgjM ...
... Just first 2 minutes https://www.youtube.com/watch?v=01U7ZUKVW8o https://www.youtube.com/watch?v=N3IgVidGjQk https://www.youtube.com/watch?v=Rj1sDWjvgjM ...
spectral typing of late-type stellar companions to young stars
... Extracting spectra from IFS instruments is non-trivial, with many challenging aspects including image registration and cross talk between channels. These have been described in Zimmerman et al. (2011) which discusses the current P1640 data pipeline. Pipeline processing produces an image of the objec ...
... Extracting spectra from IFS instruments is non-trivial, with many challenging aspects including image registration and cross talk between channels. These have been described in Zimmerman et al. (2011) which discusses the current P1640 data pipeline. Pipeline processing produces an image of the objec ...
Gravitational Radiation:
... Not clear whether R-modes are ever strong enough for their GWs to be seen Current quadrupole rad’n, not mass quadrupole ...
... Not clear whether R-modes are ever strong enough for their GWs to be seen Current quadrupole rad’n, not mass quadrupole ...
Giant Planet Formation, Evolution, and Internal Structure
... On the other hand, if planetesimals suffer a strong mass ablation during their journey towards the core, the planetary envelope will be substantially enriched with heavy elements compared to the disk gas, in particular during the first phases of planetary growth, when the solid accretion rate can be ...
... On the other hand, if planetesimals suffer a strong mass ablation during their journey towards the core, the planetary envelope will be substantially enriched with heavy elements compared to the disk gas, in particular during the first phases of planetary growth, when the solid accretion rate can be ...
GALAXIES 626
... The α-enhancement indicates that star formation in this inner disk/bulge region proceeded rapidly. The bulge structure may be younger than its stars. ...
... The α-enhancement indicates that star formation in this inner disk/bulge region proceeded rapidly. The bulge structure may be younger than its stars. ...
Neutron stars: the densest state of condensed matter
... speculated that it "might be the remains of the original star which had exploded". John Wheeler in 1966 and Franco Pacini in 1967 proposed that a rapidly rotating neutron star with a strong dipole magnetic field could power the Crab nebula and could explain Hewish observations. ...
... speculated that it "might be the remains of the original star which had exploded". John Wheeler in 1966 and Franco Pacini in 1967 proposed that a rapidly rotating neutron star with a strong dipole magnetic field could power the Crab nebula and could explain Hewish observations. ...
Stars and Galaxies - Red Hook Central Schools
... http://hubblesite.org/newscenter/archive/releases/star/supernova/2004/09/results/50/ http://hubblesite.org/newscenter/archive/releases/nebula/supernova-remnant/2005/37/results/50/ http://chandra.harvard.edu/photo/2009/casa/ ...
... http://hubblesite.org/newscenter/archive/releases/star/supernova/2004/09/results/50/ http://hubblesite.org/newscenter/archive/releases/nebula/supernova-remnant/2005/37/results/50/ http://chandra.harvard.edu/photo/2009/casa/ ...
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.