Spectroscopy
... To explain the formation of emission and absorption lines, we must understand not just the nature of light, but also the structure of atoms—the microscopic building blocks from which all matter is constructed. Let’s start with the simplest atom of all: hydrogen. A hydrogen atom consists of an electr ...
... To explain the formation of emission and absorption lines, we must understand not just the nature of light, but also the structure of atoms—the microscopic building blocks from which all matter is constructed. Let’s start with the simplest atom of all: hydrogen. A hydrogen atom consists of an electr ...
ertan et al 11cesme
... AXP/SGRs indeed require strong magnetic fields. We proposed in a series of earlier papers on fallback disk model that the magnetar fields powering the bursts could be in higher multipole components of the magnetic field which are localized close to the surface of the star rather than in the large sc ...
... AXP/SGRs indeed require strong magnetic fields. We proposed in a series of earlier papers on fallback disk model that the magnetar fields powering the bursts could be in higher multipole components of the magnetic field which are localized close to the surface of the star rather than in the large sc ...
CHANDRA on ,
... also the related UV and optical signatures, without the need to introduce an unseen compact companion. The extremely hot X-ray emitting gas is hypothesized to be entrained in a tangled magnetic field which also produces soft X-rays from flare/disk–cloud interactions as well as cold fluorescence from ...
... also the related UV and optical signatures, without the need to introduce an unseen compact companion. The extremely hot X-ray emitting gas is hypothesized to be entrained in a tangled magnetic field which also produces soft X-rays from flare/disk–cloud interactions as well as cold fluorescence from ...
preprint, pdf version - LESIA
... probe their atmospheres or place limits on their existence down to the nanobar level. In addition, occultations can eventually lead to the observation or discovery of close binary companions, satellites, or debris around the central body. For size determinations, occultations are far more suitable t ...
... probe their atmospheres or place limits on their existence down to the nanobar level. In addition, occultations can eventually lead to the observation or discovery of close binary companions, satellites, or debris around the central body. For size determinations, occultations are far more suitable t ...
USRA - MSU Solar Physics
... promptly falls into the blackhole. Consequently, jets of radiation and material moving near the speed of light out of the core result from the infalling matter and run into the outer layers of the star’s atmosphere and other material in the immediate vicinity creating shock waves which are seen as t ...
... promptly falls into the blackhole. Consequently, jets of radiation and material moving near the speed of light out of the core result from the infalling matter and run into the outer layers of the star’s atmosphere and other material in the immediate vicinity creating shock waves which are seen as t ...
Transcendental syntax I: deterministic case
... Paraconsistent logicians commit the same mistake, but on purpose: for them, there is nothing like l’usage, only irrelevant tests. Never buy a paraconsistent car! ...
... Paraconsistent logicians commit the same mistake, but on purpose: for them, there is nothing like l’usage, only irrelevant tests. Never buy a paraconsistent car! ...
On the Spiral Structure of the Milky Way Galaxy
... instability due to regular magnetic field directed along the arm. Observational indications for this assumption were recently found in the north-western fragment of the S4 spiral arm in the Andromeda galaxy, just the arm with regular wave-shaped magnetic field along it detected long ago [see 7, 8]. ...
... instability due to regular magnetic field directed along the arm. Observational indications for this assumption were recently found in the north-western fragment of the S4 spiral arm in the Andromeda galaxy, just the arm with regular wave-shaped magnetic field along it detected long ago [see 7, 8]. ...
Cygnus X-2, super-Eddington mass transfer, and pulsar binaries
... The thermal equilibrium radius R2,e depends on the relative mass MHe /M2 of the donor’s helium core. Figs. 1 – 3 show the so-called ‘generalized main sequences’ of GKW, the first schematically, and the latter two for M2i = 3M⊙ , 5M⊙ . For a core-envelope structure to be applicable, the star must hav ...
... The thermal equilibrium radius R2,e depends on the relative mass MHe /M2 of the donor’s helium core. Figs. 1 – 3 show the so-called ‘generalized main sequences’ of GKW, the first schematically, and the latter two for M2i = 3M⊙ , 5M⊙ . For a core-envelope structure to be applicable, the star must hav ...
ASTRONOMY AND ASTROPHYSICS (ASTRO)
... CCD photometry. Emphasis on projects involving proficiency in the use of research telescopes and modern instrumentation. Project topics range from photometric studies of pulsating and binary star systems to deep CCD imaging of faint nebulae and galaxies. ASTRO 580: Stellar Astrophysics (3-0) Cr. 3. ...
... CCD photometry. Emphasis on projects involving proficiency in the use of research telescopes and modern instrumentation. Project topics range from photometric studies of pulsating and binary star systems to deep CCD imaging of faint nebulae and galaxies. ASTRO 580: Stellar Astrophysics (3-0) Cr. 3. ...
T3-Cosmic Star Formation History
... global history of star formation and heavy element production of the Universe, independently of the complex evolutionary phases of individual galaxy subpopulations. The modern version of this technique relies on some basic properties of stellar populations and dusty starburst galaxies: 1. The UV-con ...
... global history of star formation and heavy element production of the Universe, independently of the complex evolutionary phases of individual galaxy subpopulations. The modern version of this technique relies on some basic properties of stellar populations and dusty starburst galaxies: 1. The UV-con ...
On the Nature of the Dust in the Debris Disk Around HD69830
... lacking. The ratio of total olivine to pyroxene abundance is ~ 4:1, as compared to the ratios of ~1:1 in the Tempel 1 sub-surface ejecta (Lisse et al. 2006), ~2:1 in the dust emitted into the coma of comet C/1995 O1 (Hale-Bopp), and 1:1 in the YSO HD100546 (Lisse et al. 2007). Both findings are dire ...
... lacking. The ratio of total olivine to pyroxene abundance is ~ 4:1, as compared to the ratios of ~1:1 in the Tempel 1 sub-surface ejecta (Lisse et al. 2006), ~2:1 in the dust emitted into the coma of comet C/1995 O1 (Hale-Bopp), and 1:1 in the YSO HD100546 (Lisse et al. 2007). Both findings are dire ...
Seeing Red: Will Betelgeuse Go Supernova in
... Gregory XIII rejected the Julian calendar and imposed his Gregorian calendar on the world. According to some scholars of the Maya, the use of this new calendar causes us to be estranged from the natural and spiritual rhythms of the cosmos. “The Mayan calendar can be used as a system of divination, b ...
... Gregory XIII rejected the Julian calendar and imposed his Gregorian calendar on the world. According to some scholars of the Maya, the use of this new calendar causes us to be estranged from the natural and spiritual rhythms of the cosmos. “The Mayan calendar can be used as a system of divination, b ...
APS Apr 2008 - User Web Pages
... lightcurves (this is not a fit!) Except for a “bump” during the burst rise, which may be an artifact of the finite time for the burning to spread, or something arising from a particular nuclear reaction ...
... lightcurves (this is not a fit!) Except for a “bump” during the burst rise, which may be an artifact of the finite time for the burning to spread, or something arising from a particular nuclear reaction ...
Autumn 2016 Midterm Review - Autumn 2015 Questions
... 23. Geomagnetic storms provide the energy that produce the aurorae at Earth’s poles. Complete the following sentence: The magnetic field of the Earth interacts with the solar wind, a. stretches almost to breaking, snaps back, and excites electrons in the atmosphere. b. causing the charged particles ...
... 23. Geomagnetic storms provide the energy that produce the aurorae at Earth’s poles. Complete the following sentence: The magnetic field of the Earth interacts with the solar wind, a. stretches almost to breaking, snaps back, and excites electrons in the atmosphere. b. causing the charged particles ...
azu_etd_13224_sip1_m
... What physical processes and sources of material contribute to exoplanet compositions? Specifically, what roles do the protoplanetary disk composition and structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in ...
... What physical processes and sources of material contribute to exoplanet compositions? Specifically, what roles do the protoplanetary disk composition and structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in ...
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.