here - SDSU Astronomy Department and Mount Laguna Observatory
... In many cases, this is because they are pulsating. The radius and temperature changes over the cycle, giving rise to brightness variations. Image from Nick Strobel’s Astronomy Notes (http://www.astronomynotes.com) ...
... In many cases, this is because they are pulsating. The radius and temperature changes over the cycle, giving rise to brightness variations. Image from Nick Strobel’s Astronomy Notes (http://www.astronomynotes.com) ...
evidence for radiogenic sulfur-32 in type ab presolar
... are J-type carbon stars (Lambert et al. 1986) and born-again AGB stars, such as Sakurai’s object (Asplund et al. 1999). J-type carbon stars, which have low 12 C/13 C ratios, are viable candidate sources of AB grains without enrichments in s-process elements (Hedrosa et al. 2013). Unfortunately, the ...
... are J-type carbon stars (Lambert et al. 1986) and born-again AGB stars, such as Sakurai’s object (Asplund et al. 1999). J-type carbon stars, which have low 12 C/13 C ratios, are viable candidate sources of AB grains without enrichments in s-process elements (Hedrosa et al. 2013). Unfortunately, the ...
The AcroCoRoT objectives (10 min) - IAG-Usp
... AcRoCorot objectives : be ready when data come to use them efficiently hence organisation of meetings such as the present one to motivate - teams with similar interest to continue to meet and talk (collaboration, exchange of brain thinkings and tools) ...
... AcRoCorot objectives : be ready when data come to use them efficiently hence organisation of meetings such as the present one to motivate - teams with similar interest to continue to meet and talk (collaboration, exchange of brain thinkings and tools) ...
6 The Uncreated Universe - Mukto-mona
... surgeon who sees me as an assemblage of atoms than one who lovingly tries to manipulate what he or she imagines are my vital energy fields. Dawkins himself has been particularly eloquent in getting across the message that science does not paint a picture of a universe that always fulfills human wish ...
... surgeon who sees me as an assemblage of atoms than one who lovingly tries to manipulate what he or she imagines are my vital energy fields. Dawkins himself has been particularly eloquent in getting across the message that science does not paint a picture of a universe that always fulfills human wish ...
Compact objects for everyone: I. White dwarf stars - Rose
... tunnelling. Thermonuclear burning continues until the formation of an iron core. Once iron— the most stable of nuclei—is reached, fusion becomes an endothermic process. However, combustion to iron is only possible for the most massive of stars. When thermonuclear fusion can no longer support the sta ...
... tunnelling. Thermonuclear burning continues until the formation of an iron core. Once iron— the most stable of nuclei—is reached, fusion becomes an endothermic process. However, combustion to iron is only possible for the most massive of stars. When thermonuclear fusion can no longer support the sta ...
Effects of color superconductivity on the nucleation of
... which gives rise to large critical masses. The converstion to a quark star will occur only for a small value of the bag constant. Both QMC and GM1 with the largest hyperon-meson couplings predict critical masses which may be as high as 1.9-2.1 M, compatible with the masses of the millisecond pulsar ...
... which gives rise to large critical masses. The converstion to a quark star will occur only for a small value of the bag constant. Both QMC and GM1 with the largest hyperon-meson couplings predict critical masses which may be as high as 1.9-2.1 M, compatible with the masses of the millisecond pulsar ...
Discovery of radio afterglow from most distant cosmic explosion
... Few milliseconds to few seconds timescale Even 100 times more energetic than supernovae Brightest sources of cosmic gamma-ray photons in the universe In universe roughly 1 GRB is detected per day Short duration (< 2 sec) and long duration (> 2sec) ...
... Few milliseconds to few seconds timescale Even 100 times more energetic than supernovae Brightest sources of cosmic gamma-ray photons in the universe In universe roughly 1 GRB is detected per day Short duration (< 2 sec) and long duration (> 2sec) ...
Solve
... After the Big Bang and initial cooling of the universe, we read in the chapter that the protons and neutrons fused together to form 2H (an isotope of hydrogen), which then could fuse with another 2H to form 4He. Solve Were other elements produced by fusion from 4He and 1H? In the chapter, we read th ...
... After the Big Bang and initial cooling of the universe, we read in the chapter that the protons and neutrons fused together to form 2H (an isotope of hydrogen), which then could fuse with another 2H to form 4He. Solve Were other elements produced by fusion from 4He and 1H? In the chapter, we read th ...
HST04-Cosmology - Indico
... • Constant k is independent of initial separation x to maintain homogeneity • An expanding universe has a unique value of k, which it retains throughout its evolution • To solve this equation we need to know how the mass density of the universe changes in time, standard examples are ρ = ρ0 / a3 for ...
... • Constant k is independent of initial separation x to maintain homogeneity • An expanding universe has a unique value of k, which it retains throughout its evolution • To solve this equation we need to know how the mass density of the universe changes in time, standard examples are ρ = ρ0 / a3 for ...
Analyze - Test Bank 1
... After the Big Bang and initial cooling of the universe, we read in the chapter that the protons and neutrons fused together to form 2H (an isotope of hydrogen), which then could fuse with another 2H to form 4He. Solve Were other elements produced by fusion from 4He and 1H? In the chapter, we read th ...
... After the Big Bang and initial cooling of the universe, we read in the chapter that the protons and neutrons fused together to form 2H (an isotope of hydrogen), which then could fuse with another 2H to form 4He. Solve Were other elements produced by fusion from 4He and 1H? In the chapter, we read th ...
PDF only - at www.arxiv.org.
... The chemistry along the mass loss of Hot Jupiters is generally considered to be simple, consisting mainly of atoms, prevented from forming more complex species by the intense radiation field from their host stars. In order to probe the region where the temperature is low (T < 2000 K), we developed a ...
... The chemistry along the mass loss of Hot Jupiters is generally considered to be simple, consisting mainly of atoms, prevented from forming more complex species by the intense radiation field from their host stars. In order to probe the region where the temperature is low (T < 2000 K), we developed a ...
nic xiii002
... states, and F(E) is the Fermi function taking into account the electromagnetic interaction between β the electrons and the nucleus. Ci f (E) is the shape factor, that is given by the reduced transition ...
... states, and F(E) is the Fermi function taking into account the electromagnetic interaction between β the electrons and the nucleus. Ci f (E) is the shape factor, that is given by the reduced transition ...
Notes (PowerPoint)
... • AU: 93 million miles – earth-sun distance • Light Year – distance light travels one year approximately 6 trillion miles • With unaided eye: sun, moon, five planets, a few thousand stars, three other galaxies, some comets • Dark matter – unlit, may be bulk of matter ...
... • AU: 93 million miles – earth-sun distance • Light Year – distance light travels one year approximately 6 trillion miles • With unaided eye: sun, moon, five planets, a few thousand stars, three other galaxies, some comets • Dark matter – unlit, may be bulk of matter ...
Radiation vs. Gas Pressure, the Stellar Mass
... Spurred by ongoing discussions in our group, as well as by prearation for my upcoming talks in Canada and Israel, I’ve been thinking more about the underlying physical basis for the increase in stellar luminosity with mass, and how this is affected by the approach to the Eddington limit. The notes h ...
... Spurred by ongoing discussions in our group, as well as by prearation for my upcoming talks in Canada and Israel, I’ve been thinking more about the underlying physical basis for the increase in stellar luminosity with mass, and how this is affected by the approach to the Eddington limit. The notes h ...
Ten Years Of XMM-Newton: Scientific Achievements And Future Prospects Norbert Schartel
... • Distance to globular clusters is well known ...
... • Distance to globular clusters is well known ...
The physics of high-mass star formation
... Importance of high-mass stars • Bipolar outflows, stellar winds, HII regions destroy molecular clouds but may also trigger star formation • Supernovae enrich ISM with metals affect star formation • Sources of: energy, momentum, ionization, cosmic rays, neutron stars, black holes, GRBs • OB st ...
... Importance of high-mass stars • Bipolar outflows, stellar winds, HII regions destroy molecular clouds but may also trigger star formation • Supernovae enrich ISM with metals affect star formation • Sources of: energy, momentum, ionization, cosmic rays, neutron stars, black holes, GRBs • OB st ...
IAC_L5_bulge_GALAH
... HERMES is a new high-resolution fiber-fed multi-object spectrometer on the AAT spectral resolution 28,000 (also R = 45,000 mode) 400 fibres over square degrees 4 bands (BGRI) ~ 1000 Å First light late 2013 Main driver: the GALAH survey (Galactic Archaeology with HERMES) ...
... HERMES is a new high-resolution fiber-fed multi-object spectrometer on the AAT spectral resolution 28,000 (also R = 45,000 mode) 400 fibres over square degrees 4 bands (BGRI) ~ 1000 Å First light late 2013 Main driver: the GALAH survey (Galactic Archaeology with HERMES) ...
The influence of chemical composition on the pulsation properties of
... The influence of chemical composition on the pulsation properties of Cepheids: theory vs. observations Martino Romaniello (ESO) G. Bono, F. Primas, M. Groenewegen, S. Pedicelli, M. Mottini, B. Lemasle, P. François, C.D. Laney, G.Fiorentino ...
... The influence of chemical composition on the pulsation properties of Cepheids: theory vs. observations Martino Romaniello (ESO) G. Bono, F. Primas, M. Groenewegen, S. Pedicelli, M. Mottini, B. Lemasle, P. François, C.D. Laney, G.Fiorentino ...
Please Highlight this Area and Add your Main Title
... Variable stars are unique stars that periodically change in brightness over time.The magnitude of a star is a number assigned to a star’s brightness where the brightest stars are known as magnitude 1 stars and the dimmest stars that can be seen by the unaided eye are magnitude 6; therefore, the brig ...
... Variable stars are unique stars that periodically change in brightness over time.The magnitude of a star is a number assigned to a star’s brightness where the brightest stars are known as magnitude 1 stars and the dimmest stars that can be seen by the unaided eye are magnitude 6; therefore, the brig ...
Document
... The halo could/might look like the most metal-poor dSph stars but definitely does not look like the more metal-rich (relatively) dSph stars. Who cares? The halo clearly formed fairly quickly before such stars would have formed and thus everything is consistent, right? ...
... The halo could/might look like the most metal-poor dSph stars but definitely does not look like the more metal-rich (relatively) dSph stars. Who cares? The halo clearly formed fairly quickly before such stars would have formed and thus everything is consistent, right? ...
Stars M. R. W. Masheder Room 4.15
... Because of the definition of the magnitude system, we can write the ratio of fluxes in two bands as a difference in magnitudes, e.g. mB -mV B-V = -2.5log(FB/FV). Thus an increase in FB/FV will lead to a decrease in the colour index BV. Hot, blue stars have small (or negative) B-V while cool red sta ...
... Because of the definition of the magnitude system, we can write the ratio of fluxes in two bands as a difference in magnitudes, e.g. mB -mV B-V = -2.5log(FB/FV). Thus an increase in FB/FV will lead to a decrease in the colour index BV. Hot, blue stars have small (or negative) B-V while cool red sta ...
Dark Stars: Dark Matter annihilation can power the first stars
... universe may be powered by Dark Matter annihilation rather than by Fusion (even though the dark matter constitutes less than 1% of the mass of the star). THESE REALLY ARE STARS: atomic matter that shines due to dark matter, possibly a billion times as bright as the Sun • This new phase of stellar e ...
... universe may be powered by Dark Matter annihilation rather than by Fusion (even though the dark matter constitutes less than 1% of the mass of the star). THESE REALLY ARE STARS: atomic matter that shines due to dark matter, possibly a billion times as bright as the Sun • This new phase of stellar e ...
2015 SAO Summer Intern AAS Abstracts - Harvard
... Transit light curves contain a wealth of information about the basic properties of a planet, such as its radius, semi-major axis, and orbital period. For the latter property, there is a distinct lack of planets with periods between 10 to 100 days. This gap could be caused by something as simple as o ...
... Transit light curves contain a wealth of information about the basic properties of a planet, such as its radius, semi-major axis, and orbital period. For the latter property, there is a distinct lack of planets with periods between 10 to 100 days. This gap could be caused by something as simple as o ...
Cosmic Radiation
... full of very small charged particles speeding in all directions. The situation can be compared to the Earth having to constantly travel in a light shower of rain and with the atmosphere acting like an umbrella. The 'rain' is made up of charged particles called 'Cosmic Rays'. The name cosmic ray was ...
... full of very small charged particles speeding in all directions. The situation can be compared to the Earth having to constantly travel in a light shower of rain and with the atmosphere acting like an umbrella. The 'rain' is made up of charged particles called 'Cosmic Rays'. The name cosmic ray was ...
Nucleosynthesis
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. It was then that hydrogen and helium formed to become the content of the first stars, and this primeval process is responsible for the present hydrogen/helium ratio of the cosmos.With the formation of stars, heavier nuclei were created from hydrogen and helium by stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form white dwarfs. The remains of their ejected mass form the planetary nebulae observable throughout our galaxy.Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between magnesium (atomic number 12) and nickel (atomic number 28). Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a type II supernova event. The synthesis of these heavier elements absorbs energy (endothermic) as they are created, from the energy produced during the supernova explosion. Some of those elements are created from the absorption of multiple neutrons (the R process) in the period of a few seconds during the explosion. The elements formed in supernovas include the heaviest elements known, such as the long-lived elements uranium and thorium.Cosmic ray spallation, caused when cosmic rays impact the interstellar medium and fragment larger atomic species, is a significant source of the lighter nuclei, particularly 3He, 9Be and 10,11B, that are not created by stellar nucleosynthesis.In addition to the fusion processes responsible for the growing abundances of elements in the universe, a few minor natural processes continue to produce very small numbers of new nuclides on Earth. These nuclides contribute little to their abundances, but may account for the presence of specific new nuclei. These nuclides are produced via radiogenesis (decay) of long-lived, heavy, primordial radionuclides such as uranium and thorium. Cosmic ray bombardment of elements on Earth also contribute to the presence of rare, short-lived atomic species called cosmogenic nuclides.