asteroseismological study of massive zz ceti stars with
... mass right before the first thermal pulse. Althaus et al. (2010a) demonstrated that, depending on the stellar mass of the white dwarf, the central oxygen abundances can be underestimated up to a ∼15% if the white dwarf mass is taken as the mass of the hydrogen-free core at the first thermal pulse. L ...
... mass right before the first thermal pulse. Althaus et al. (2010a) demonstrated that, depending on the stellar mass of the white dwarf, the central oxygen abundances can be underestimated up to a ∼15% if the white dwarf mass is taken as the mass of the hydrogen-free core at the first thermal pulse. L ...
Spectroscopic Variability of Supergiant Star HD14134, B3Ia
... 1 and 2). In these same spectra, all the other lines typical for hot supergiants such as HD14134, apart from Hα, are observed, including Hβ. In order to investigate the short term variability in the Hα profile, all individual spectra obtained on December 29-30, 2013, and on February 13, 15, 2016 were ...
... 1 and 2). In these same spectra, all the other lines typical for hot supergiants such as HD14134, apart from Hα, are observed, including Hβ. In order to investigate the short term variability in the Hα profile, all individual spectra obtained on December 29-30, 2013, and on February 13, 15, 2016 were ...
Development of Trap-assisted spectroscopy and its application to
... The mass determination has been the primary motivation of the use of Penning traps in nuclear physics. However, in the recent years the beam preparation traps have become more widely used, not simply for the purification of an ion beam prior to a precision mass measurement. For example the beam mani ...
... The mass determination has been the primary motivation of the use of Penning traps in nuclear physics. However, in the recent years the beam preparation traps have become more widely used, not simply for the purification of an ion beam prior to a precision mass measurement. For example the beam mani ...
(n,γ) x-sections of 63 Ni
... Neutron cross sections are key quantities for studying stellar evolution and nucleosynthesis. n_TOF offers the best conditions to obtain these nuclear physics quantities with the required accuracy. The n_TOF Collaboration is carrying on an extensive plan to measure cross sections relevant for nuclea ...
... Neutron cross sections are key quantities for studying stellar evolution and nucleosynthesis. n_TOF offers the best conditions to obtain these nuclear physics quantities with the required accuracy. The n_TOF Collaboration is carrying on an extensive plan to measure cross sections relevant for nuclea ...
The Chemical Composition of Carbon-Rich, Very Metal
... put forward to account for the moderately metal-poor classical CH stars ([Fe/H]∼ −1.5). These are usually explained by a model involving mass transfer from a carbon-enhanced asymptotic giant branch (AGB) star (one that has since evolved to the white dwarf stage and cannot now be seen) to its lower-m ...
... put forward to account for the moderately metal-poor classical CH stars ([Fe/H]∼ −1.5). These are usually explained by a model involving mass transfer from a carbon-enhanced asymptotic giant branch (AGB) star (one that has since evolved to the white dwarf stage and cannot now be seen) to its lower-m ...
Winds from clusters with non-uniform stellar distribution
... massive stars first identified in NGC 1705 by Melnick et al. (1985) and in NGC 1569 by Arp & Sandage (1985). Recently, they have been observed in a wide range of starforming galaxies, such as merging systems (NGC 4038/4039), dwarf galaxies, classical starbursts, as well as in our galaxy amongst many ...
... massive stars first identified in NGC 1705 by Melnick et al. (1985) and in NGC 1569 by Arp & Sandage (1985). Recently, they have been observed in a wide range of starforming galaxies, such as merging systems (NGC 4038/4039), dwarf galaxies, classical starbursts, as well as in our galaxy amongst many ...
A propelling neutron star in the enigmatic Be-star γ Cassiopeia
... energy into the shell at the propeller stage. Clearly, once ωm → ω∗ during the NS spin-down, the mechanical energy supply to the shell should vanish. However, even in this case the shell can be kept hot due to the gravitational energy release given by equation (2). To provide X-ray luminosity at the ...
... energy into the shell at the propeller stage. Clearly, once ωm → ω∗ during the NS spin-down, the mechanical energy supply to the shell should vanish. However, even in this case the shell can be kept hot due to the gravitational energy release given by equation (2). To provide X-ray luminosity at the ...
Electric-dipole moments of elementary particles
... direct experimental evidence at that time in the case of the strong and weak interactions. In 1964 Christenson et a1 discovered the CP-violating decay of the K i meson into two charged pions; if one assumes CPT symmetry as discussed above the result implies a violation of T symmetry. A direct indica ...
... direct experimental evidence at that time in the case of the strong and weak interactions. In 1964 Christenson et a1 discovered the CP-violating decay of the K i meson into two charged pions; if one assumes CPT symmetry as discussed above the result implies a violation of T symmetry. A direct indica ...
dark matter effective field theories in stars
... large number of well-motivated models that have a p-wave contribution to the annihilation cross-section (i.e., a dependence on the relative velocity between WIMPs), which can be dominant. Models where dark matter is a Majorana particle, such as the neutralino, a natural candidate thatarises in the ...
... large number of well-motivated models that have a p-wave contribution to the annihilation cross-section (i.e., a dependence on the relative velocity between WIMPs), which can be dominant. Models where dark matter is a Majorana particle, such as the neutralino, a natural candidate thatarises in the ...
High Resolution Chandra Spectroscopy of Gamma Cassiopeia (B0
... hot (12 keV) component, of which some fraction (10 – 30%) is heavily absorbed, while the remainder is affected by only a much lower column density of 3×1021 cm−2 . The hot component has a Fe abundance of only 0.22±.05 solar. The other two or three major emission components are “warm” and are respons ...
... hot (12 keV) component, of which some fraction (10 – 30%) is heavily absorbed, while the remainder is affected by only a much lower column density of 3×1021 cm−2 . The hot component has a Fe abundance of only 0.22±.05 solar. The other two or three major emission components are “warm” and are respons ...
Slides - Indico
... H = Hubble constant G = Newton's gravitational constant = energy density (i.e. photons and neutrinos density in the early Universe) ...
... H = Hubble constant G = Newton's gravitational constant = energy density (i.e. photons and neutrinos density in the early Universe) ...
X-ray Observations of Cosmic Accelerators Greg Madejski SLAC/KIPAC
... * Neutron stars left behind the explosion may manifest themselves as pulsars; they gradually cool, radiating thermal continuum * Measurements of the flux + distance (=luminosity, or emitted power) and neutron star surface temperature determine radius and thus with mass measuremets provide hints to d ...
... * Neutron stars left behind the explosion may manifest themselves as pulsars; they gradually cool, radiating thermal continuum * Measurements of the flux + distance (=luminosity, or emitted power) and neutron star surface temperature determine radius and thus with mass measuremets provide hints to d ...
CORONAL EVOLUTION OF THE SUN IN TIME: HIGH
... this picture, the flare rate is responsible both for bringing dense material into the corona and for heating it to high temperatures, analogous to the behavior of individual flares observed on the Sun. A large flare rate in younger stars with a higher magnetic filling factor could thus produce X-ray ...
... this picture, the flare rate is responsible both for bringing dense material into the corona and for heating it to high temperatures, analogous to the behavior of individual flares observed on the Sun. A large flare rate in younger stars with a higher magnetic filling factor could thus produce X-ray ...
Direct Imaging Searches Around White Dwarfs - X
... • Original orbit ~2AU (max extent of AGB envelope) • WD progenitor 3.5Msun/B9V ...
... • Original orbit ~2AU (max extent of AGB envelope) • WD progenitor 3.5Msun/B9V ...
A seismic and gravitationally-bound double star observed by Kepler
... of mode frequencies required for seismic analysis (See Appourchaux et al. 2012, and references therein). Additional invaluable information about the evolution of stars is provided by the study of the internal structure of red giants (Bedding et al. 2011; Beck et al. 2011, 2012; Mosser et al. 2012a,b ...
... of mode frequencies required for seismic analysis (See Appourchaux et al. 2012, and references therein). Additional invaluable information about the evolution of stars is provided by the study of the internal structure of red giants (Bedding et al. 2011; Beck et al. 2011, 2012; Mosser et al. 2012a,b ...
astro-ph/0301519 PDF
... than the values inferred from earlier pure H analyses. In the wider context of white dwarf evolution, we now have the opportunity of comparing the abundances of these very hot objects with their immediate hot white dwarf descendants. To facilitate this, we have re-examined all the archive far UV spe ...
... than the values inferred from earlier pure H analyses. In the wider context of white dwarf evolution, we now have the opportunity of comparing the abundances of these very hot objects with their immediate hot white dwarf descendants. To facilitate this, we have re-examined all the archive far UV spe ...
" Galaxy," Defined
... 2010). For such theories, our definition would require distinct observable consequences of non-standard gravity to be imprinted on an astrophysical system for it to be classified as a galaxy. In the interest of simplicity, we focus Sections 3 and 4 of this paper on diagnosing our proposed galaxy def ...
... 2010). For such theories, our definition would require distinct observable consequences of non-standard gravity to be imprinted on an astrophysical system for it to be classified as a galaxy. In the interest of simplicity, we focus Sections 3 and 4 of this paper on diagnosing our proposed galaxy def ...
The K2-ESPRINT Project III: A Close-in Super
... Transitos) collaboration, which aims to discover and characterize unique transiting planets unveiled by K2. ESPRINT has contributed to the K2 haul of discoveries with a disintegrating ultra-short period planet with a cometary tail around an M dwarf (ESPRINT I: Sanchis-Ojeda et al. 2015), and confirm ...
... Transitos) collaboration, which aims to discover and characterize unique transiting planets unveiled by K2. ESPRINT has contributed to the K2 haul of discoveries with a disintegrating ultra-short period planet with a cometary tail around an M dwarf (ESPRINT I: Sanchis-Ojeda et al. 2015), and confirm ...
RXTE PCA Contributions to Monitoring Fast Transients
... Characteristics of the Transients Recurrence times of the transient outbursts range upward from 1/2 year. Duration of outburst is (roughly) correlated with peak luminosity in the same object and probably from object to object. Caveats: Rapid Burster and GRS 1747-312: similar durations, different lu ...
... Characteristics of the Transients Recurrence times of the transient outbursts range upward from 1/2 year. Duration of outburst is (roughly) correlated with peak luminosity in the same object and probably from object to object. Caveats: Rapid Burster and GRS 1747-312: similar durations, different lu ...
Hypothesis on MATTER
... fundamental and matter alone provides substance to all real entities’. Unstructured matter-particles, derived from this assumption - Quanta of matter – in various combinations form an allencompassing universal medium and all 3D matter-bodies. Itinerary, that lead to development of this concept, is b ...
... fundamental and matter alone provides substance to all real entities’. Unstructured matter-particles, derived from this assumption - Quanta of matter – in various combinations form an allencompassing universal medium and all 3D matter-bodies. Itinerary, that lead to development of this concept, is b ...
hwd_ewd_v3 - X-ray and Observational Astronomy Group
... according to the characteristics revealed. A number of physical processes can alter the atmospheric composition of a white dwarf as it cools. As noted by Schatzman4, the strong gravitational field (log g ~ 8 at the surface) causes rapid downward diffusion of elements heavier than the principal H or ...
... according to the characteristics revealed. A number of physical processes can alter the atmospheric composition of a white dwarf as it cools. As noted by Schatzman4, the strong gravitational field (log g ~ 8 at the surface) causes rapid downward diffusion of elements heavier than the principal H or ...
P-nuclei
p-Nuclei (p stands for proton-rich) are certain proton-rich, naturally occurring isotopes of some elements between selenium and mercury which cannot be produced in either s- or r-process.