Stars sensors terminology and performance
... This Standard is one of the series of ECSS Standards intended to be applied together for the management, engineering and product assurance in space projects and applications. ECSS is a cooperative effort of the European Space Agency, national space agencies and European industry associations for the ...
... This Standard is one of the series of ECSS Standards intended to be applied together for the management, engineering and product assurance in space projects and applications. ECSS is a cooperative effort of the European Space Agency, national space agencies and European industry associations for the ...
Radio Emission Toward Regions of Massive Star Formation
... Our understanding of high-mass star formation is not that simple. In this dissertation and per convention, stars with enough mass to end their lives as core-collapse supernovae (M∗ ≥ 8.0 M ) are considered ‘high-mass’ stars. High-mass stars have difficulty forming in this fashion, because the onset ...
... Our understanding of high-mass star formation is not that simple. In this dissertation and per convention, stars with enough mass to end their lives as core-collapse supernovae (M∗ ≥ 8.0 M ) are considered ‘high-mass’ stars. High-mass stars have difficulty forming in this fashion, because the onset ...
Sky Watcher - Boise Astronomical Society
... Venus is the bright "Morning Star", blazing low in the east before and during dawn. The planet loses a little of its altitude in May, but at magnitude -4 around mid-month you will not have any trouble distinguishing it. The Red Planet reached opposition and peak visibility in April, and remains impr ...
... Venus is the bright "Morning Star", blazing low in the east before and during dawn. The planet loses a little of its altitude in May, but at magnitude -4 around mid-month you will not have any trouble distinguishing it. The Red Planet reached opposition and peak visibility in April, and remains impr ...
Structure of Hot Molecular Cores
... 3.6.1 Temperature computation . . . . . . . . . . . . 3.6.2 A grid of models . . . . . . . . . . . . . . . . . 3.6.3 Selection . . . . . . . . . . . . . . . . . . . . . 3.7 Modeling procedure: Lines . . . . . . . . . . . . . . . . 3.7.1 Line radiative transfer . . . . . . . . . . . . . . 3.7.2 Fitti ...
... 3.6.1 Temperature computation . . . . . . . . . . . . 3.6.2 A grid of models . . . . . . . . . . . . . . . . . 3.6.3 Selection . . . . . . . . . . . . . . . . . . . . . 3.7 Modeling procedure: Lines . . . . . . . . . . . . . . . . 3.7.1 Line radiative transfer . . . . . . . . . . . . . . 3.7.2 Fitti ...
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... later structure formation and the reionization of the universe. Additionally, the presence of a soft ultraviolet background and warm dark matter serves to delay the onset of star formation. I propose limits on the possible mass of a warm dark matter particle. I also present results of simulations wh ...
... later structure formation and the reionization of the universe. Additionally, the presence of a soft ultraviolet background and warm dark matter serves to delay the onset of star formation. I propose limits on the possible mass of a warm dark matter particle. I also present results of simulations wh ...
Impact of Protostellar Outflow on Star Formation: Effects of Initial
... With a simple analytical approach, they showed that a wide-opening-angle outflow sweeps up the gas in the infalling envelope and ejects it into the interstellar space. They concluded that the protostellar outflow can limit star formation efficiency to ϵ ∼ 30 − 50%. In addition, feedback from the protost ...
... With a simple analytical approach, they showed that a wide-opening-angle outflow sweeps up the gas in the infalling envelope and ejects it into the interstellar space. They concluded that the protostellar outflow can limit star formation efficiency to ϵ ∼ 30 − 50%. In addition, feedback from the protost ...
Supernova - Wikipedia, the free encyclopedia
... the production of energy through nuclear fusion. After the core of an aging massive star ceases generating energy from nuclear fusion, it may undergo sudden gravitational collapse into a neutron star or black hole, releasing gravitational potential energy that heats and expels the star's outer layer ...
... the production of energy through nuclear fusion. After the core of an aging massive star ceases generating energy from nuclear fusion, it may undergo sudden gravitational collapse into a neutron star or black hole, releasing gravitational potential energy that heats and expels the star's outer layer ...
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... very few people have access to al-Ṣūfī’s work and many researchers believe that an English translation and a study of such works by Arab astronomers are very important at this time. This turned out to be a journey of re-discovery of a man who helped influence the science of astronomy and courageousl ...
... very few people have access to al-Ṣūfī’s work and many researchers believe that an English translation and a study of such works by Arab astronomers are very important at this time. This turned out to be a journey of re-discovery of a man who helped influence the science of astronomy and courageousl ...
An X-Ray, Optical and Infra-red study of High-Mass X
... First and foremost I would like to thank my supervisor, Malcolm Coe, for his continued guidance and support. His drive to obtain and exploit all manner of data has given me a wealth of information on which to base my thesis and sent me to some of the world’s most incredible places in the process. I ...
... First and foremost I would like to thank my supervisor, Malcolm Coe, for his continued guidance and support. His drive to obtain and exploit all manner of data has given me a wealth of information on which to base my thesis and sent me to some of the world’s most incredible places in the process. I ...
Axisymmetry in protoplanetary nebulae: using imaging polarimetry
... emission from a cool dusty CSE, and a double-peaked SED indicating that the envelope is detached from the star. We have not selected the targets on the grounds of morphology, and indeed all appear point source-like in previously published ground-based imaging. Despite their common properties, it is ...
... emission from a cool dusty CSE, and a double-peaked SED indicating that the envelope is detached from the star. We have not selected the targets on the grounds of morphology, and indeed all appear point source-like in previously published ground-based imaging. Despite their common properties, it is ...
The most metal-poor galaxies
... The discovery of extragalactic objects with very low heavy element abundance was made by Searle and Sargent (1972) who reported on the properties of two intriguing galaxies, IZw18 and IIZw40. They emphasised that they could be genuinely young galaxies in the process of formation, because of their ex ...
... The discovery of extragalactic objects with very low heavy element abundance was made by Searle and Sargent (1972) who reported on the properties of two intriguing galaxies, IZw18 and IIZw40. They emphasised that they could be genuinely young galaxies in the process of formation, because of their ex ...
The masses and spins of neutron stars and stellar
... As the remnants of core-collapse supernovae, neutron stars and black holes are also windows into the collapse and explosion processes. The further evolution of these systems in accreting binaries can tell us about the accretion process, e.g., the total amount of mass that is typically deposited on t ...
... As the remnants of core-collapse supernovae, neutron stars and black holes are also windows into the collapse and explosion processes. The further evolution of these systems in accreting binaries can tell us about the accretion process, e.g., the total amount of mass that is typically deposited on t ...
PDF - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
(Download from http://astronomy.nmsu.edu/astro/) c NMSU
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
HH 222: A Giant Herbig-Haro Flow from the
... a faint companion of spectral type M5 or M6, which at an age of ∼1 Myr corresponds to an object straddling the stellar-to-brown dwarf boundary. We suggest that the HH 222 giant bow shock is a direct result of the dynamical interactions that led to the conversion from an initial non-hierarchical mult ...
... a faint companion of spectral type M5 or M6, which at an age of ∼1 Myr corresponds to an object straddling the stellar-to-brown dwarf boundary. We suggest that the HH 222 giant bow shock is a direct result of the dynamical interactions that led to the conversion from an initial non-hierarchical mult ...
Dawes Review. The tidal downsizing hypothesis of planet formation
... . 5 M⊕ , that is in between the terrestrial planet mass and the more distant ”ice giants” (such a core mass is allowed by the Jupiter’s interior models, e.g., Guillot, 2005), then Jupiter was not strongly affected by the feedback from its core. It is therefore reasonable that Jupiter kept all or a m ...
... . 5 M⊕ , that is in between the terrestrial planet mass and the more distant ”ice giants” (such a core mass is allowed by the Jupiter’s interior models, e.g., Guillot, 2005), then Jupiter was not strongly affected by the feedback from its core. It is therefore reasonable that Jupiter kept all or a m ...
NexStar GT - Celestron
... the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your NexStar, so you should keep this manual handy until you have ...
... the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your NexStar, so you should keep this manual handy until you have ...
Differential rotation on both components of the pre-main
... are therefore found to have rates of differential rotation similar to those of the same spectraltype main-sequence single stars. The results for HD 155555 are therefore in contrast to those found in other, more evolved, binary systems where negligible or weak differential rotation has been discovere ...
... are therefore found to have rates of differential rotation similar to those of the same spectraltype main-sequence single stars. The results for HD 155555 are therefore in contrast to those found in other, more evolved, binary systems where negligible or weak differential rotation has been discovere ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... We present an analysis of a systematic CO(2–1) survey at 1200 resolution covering most of the Local Group spiral M 33, which, at a distance of 840 kpc, is close enough for individual giant molecular clouds (GMCs) to be identified. The goal of this work is to study the properties of the GMCs in this ...
... We present an analysis of a systematic CO(2–1) survey at 1200 resolution covering most of the Local Group spiral M 33, which, at a distance of 840 kpc, is close enough for individual giant molecular clouds (GMCs) to be identified. The goal of this work is to study the properties of the GMCs in this ...
CHARACTERIZING PROPERTIES OF OPTICAL FIBERS AND
... with period P. The exoplanet induces a radial-velocity semi-amplitude, K, in the host star's motion (Clubb 2008). ..................................................................... 7 Figure 1-3: Definition of orbital inclination. When i = 90° the orbit is seen edgeon, and when it is 0° it is seen ...
... with period P. The exoplanet induces a radial-velocity semi-amplitude, K, in the host star's motion (Clubb 2008). ..................................................................... 7 Figure 1-3: Definition of orbital inclination. When i = 90° the orbit is seen edgeon, and when it is 0° it is seen ...
Altair -- the ``hottest`` magnetically active star in X-rays
... surface features might have occurred over times of several days. To investigate periodicity of the obtained X-ray light curves, that might be related to rotational modulation, we tested periods in the range of 7–13 h for both observations separately, resulting in a minimum of ten time bin pairs per ...
... surface features might have occurred over times of several days. To investigate periodicity of the obtained X-ray light curves, that might be related to rotational modulation, we tested periods in the range of 7–13 h for both observations separately, resulting in a minimum of ten time bin pairs per ...
Slide 1
... Moving Towards Black Holes • If the remaining neutron star has a “critical mass” (about 3MSun) it can continue to collapse • Nothing left to oppose the crush of gravity! Continues to collapse until it becomes a Black ...
... Moving Towards Black Holes • If the remaining neutron star has a “critical mass” (about 3MSun) it can continue to collapse • Nothing left to oppose the crush of gravity! Continues to collapse until it becomes a Black ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.