The physics of star formation
... Stars are the fundamental units of luminous matter in the universe, and they are responsible, directly or indirectly, for most of what we see when we observe it. They also serve as our primary tracers of the structure and evolution of the universe and its contents. Consequently, it is of central imp ...
... Stars are the fundamental units of luminous matter in the universe, and they are responsible, directly or indirectly, for most of what we see when we observe it. They also serve as our primary tracers of the structure and evolution of the universe and its contents. Consequently, it is of central imp ...
High Energy Phenomena in Supergiant X-ray Binaries - HAL-Insu
... a 2′ uncertainty. XMM-Newton observations revealed a comptonised spectrum exhibiting an unusually high level of absorption: NH ∼ 1.84 × 1024 cm−2 (Matt & Guainazzi 2003). The accurate localisation by XMM-Newton allowed Filliatre & Chaty (2004) to rapidly trigger ToO photometric and spectroscopic obs ...
... a 2′ uncertainty. XMM-Newton observations revealed a comptonised spectrum exhibiting an unusually high level of absorption: NH ∼ 1.84 × 1024 cm−2 (Matt & Guainazzi 2003). The accurate localisation by XMM-Newton allowed Filliatre & Chaty (2004) to rapidly trigger ToO photometric and spectroscopic obs ...
DTU_9e_ch15
... which pass readily through intervening interstellar dust and H II regions that illuminate the spiral arms. These observations have revealed the dynamic nature of the galactic nucleus, but much about it remains unexplained. A supermassive black hole of about 4.3 x 106 solar masses exists in the galac ...
... which pass readily through intervening interstellar dust and H II regions that illuminate the spiral arms. These observations have revealed the dynamic nature of the galactic nucleus, but much about it remains unexplained. A supermassive black hole of about 4.3 x 106 solar masses exists in the galac ...
Worksheet 3 - Perimeter Institute
... between the gravitational mass within this radius and the total mass of the stars (1.54 x 1041 kg). Represent this difference as a percentage of the gravitational mass within the orbital radius. Record your answers in the “Missing Mass” column. 6. Do your results support the following statement? “It ...
... between the gravitational mass within this radius and the total mass of the stars (1.54 x 1041 kg). Represent this difference as a percentage of the gravitational mass within the orbital radius. Record your answers in the “Missing Mass” column. 6. Do your results support the following statement? “It ...
Planetarium Key Points
... the ecliptic, they tend to pull the equatorial bullge of the Earth towards it and most of this “flattening torque” is caused by the Moon and the Sun. But the Earth is rotating and therefore the torque cannot change the inclination of the equator relative to ecliptic, istead the rotation axis turns i ...
... the ecliptic, they tend to pull the equatorial bullge of the Earth towards it and most of this “flattening torque” is caused by the Moon and the Sun. But the Earth is rotating and therefore the torque cannot change the inclination of the equator relative to ecliptic, istead the rotation axis turns i ...
Day 1: How to Describe the Sky The Motions of the Stars
... • The angle an object appears to span in your field of view. • Depends on: • Actual size of object • Distance from us to the object ...
... • The angle an object appears to span in your field of view. • Depends on: • Actual size of object • Distance from us to the object ...
Starburst Galaxies Under the Microscope: High
... stars with a mass of about 8 M (the most numerous stars still producing supernovae), which have a lifetime of about 3 10 7 years, the BrG and [Fe II] emission trace phases of the starbursts that are temporally separated by this amount of time. In principle, one could use these results then to calcu ...
... stars with a mass of about 8 M (the most numerous stars still producing supernovae), which have a lifetime of about 3 10 7 years, the BrG and [Fe II] emission trace phases of the starbursts that are temporally separated by this amount of time. In principle, one could use these results then to calcu ...
Heic0116: EMBARGOED UNTIL: 20:00 (CET) WEDNESDAY 05
... weakly interacting, massive sub-atomic sized particles known as WIMPs. Alternatively Dark Matter may consist of massive compact objects (MACHOs), such as dead or dying stars (neutron stars and cool dwarf stars), black holes of various sizes or planet-sized collections of rocks and ice. The MACHOs In ...
... weakly interacting, massive sub-atomic sized particles known as WIMPs. Alternatively Dark Matter may consist of massive compact objects (MACHOs), such as dead or dying stars (neutron stars and cool dwarf stars), black holes of various sizes or planet-sized collections of rocks and ice. The MACHOs In ...
Axions and White Dwarfs
... where t satisfies the condition t = T − tcool (l, M ) − tPS (M ) and l = − log(L/L⊙ ), M is the mass of the parent star (for convenience all white dwarfs are labeled with the mass of the main sequence progenitor), tcool is the cooling time down to luminosity l, τcool = dt/dMbol is the characteristic ...
... where t satisfies the condition t = T − tcool (l, M ) − tPS (M ) and l = − log(L/L⊙ ), M is the mass of the parent star (for convenience all white dwarfs are labeled with the mass of the main sequence progenitor), tcool is the cooling time down to luminosity l, τcool = dt/dMbol is the characteristic ...
– 1 – 1. Nucleosynthetic Yields From Various Sources
... Currently three varieties are recognized: very energetic hypernovae, with kinetic energy about 10 times larger than normal SNII, i.e. > 1052 ergs, which probably form black holes as remnants, normal core collapse SN with explosion energy ∼ 1051 ergs, and very faint and low energy SN, which may be ch ...
... Currently three varieties are recognized: very energetic hypernovae, with kinetic energy about 10 times larger than normal SNII, i.e. > 1052 ergs, which probably form black holes as remnants, normal core collapse SN with explosion energy ∼ 1051 ergs, and very faint and low energy SN, which may be ch ...
Life Before the Fall: Group Galaxy Evolution Prior to Cluster Assembly
... Ringberg Workshop - October 25, 2005 ...
... Ringberg Workshop - October 25, 2005 ...
Stellar Evolution : The Life and Death of Our Luminous Neighbors
... planetary nebula - A luminous shell of gas ejected from an old, low- mass star plasma - A hot ionized gas pulsar - A pulsating radio source believed to be associated with a rapidly rotating neutron star red giant - A large, cool star of high luminosity red supergiant - An extremely large, cool star ...
... planetary nebula - A luminous shell of gas ejected from an old, low- mass star plasma - A hot ionized gas pulsar - A pulsating radio source believed to be associated with a rapidly rotating neutron star red giant - A large, cool star of high luminosity red supergiant - An extremely large, cool star ...
Lesson Plan - eCUIP
... Introduction: Edwin Hubble made some of the most important discoveries in modern astronomy. In the 1920s, while working at the Mt. Wilson Observatory, he was able to show that some of the numerous distant, faint clouds of light in the universe were actually entire galaxies. This realization changed ...
... Introduction: Edwin Hubble made some of the most important discoveries in modern astronomy. In the 1920s, while working at the Mt. Wilson Observatory, he was able to show that some of the numerous distant, faint clouds of light in the universe were actually entire galaxies. This realization changed ...
plagiarism - things to know - Science Department
... Although dusty clouds block our vision of the Swan, in visible light looks rather stellar nurseries, infrared light reveals them. These newborns glitter like a jewel box and dull. Yet at an infrared wavelength of 60 seem to be peeking at us from behind the the region looks very different. In dust o ...
... Although dusty clouds block our vision of the Swan, in visible light looks rather stellar nurseries, infrared light reveals them. These newborns glitter like a jewel box and dull. Yet at an infrared wavelength of 60 seem to be peeking at us from behind the the region looks very different. In dust o ...
Stars 3
... of this flickering, the neutron star is also called a “pulsar.” In addition to the pulses, the neutron star’s rapid rotation and intense magnetic field act as an immense slingshot, accelerating subatomic particles to close to the speed of light and flinging them off into space. In a dramatic series ...
... of this flickering, the neutron star is also called a “pulsar.” In addition to the pulses, the neutron star’s rapid rotation and intense magnetic field act as an immense slingshot, accelerating subatomic particles to close to the speed of light and flinging them off into space. In a dramatic series ...
Variable star information
... they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that is external to star or the rotation of the star, for example: Most of the stars ...
... they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that is external to star or the rotation of the star, for example: Most of the stars ...
ASTRONOMY 120
... A nova is a binary star system that suddenly brightens and then slowly fades back to normal. It is caused by an evolving star in a binary that is expanding past its Roche lobe and losing gas to a companion white dwarf. After a while, the material (primarily hydrogen) builds up on the white dwarf and ...
... A nova is a binary star system that suddenly brightens and then slowly fades back to normal. It is caused by an evolving star in a binary that is expanding past its Roche lobe and losing gas to a companion white dwarf. After a while, the material (primarily hydrogen) builds up on the white dwarf and ...
slide-show source file - Bartol Research Institute
... For hot, luminous stars the driving is generally thought to stem from radiation pressure acting through line scattering. The Doppler shift of the line-profile within the expanding wind effectively “sweeps out” the star’s continuum momentum flux. This makes the driving force a function of the wind ...
... For hot, luminous stars the driving is generally thought to stem from radiation pressure acting through line scattering. The Doppler shift of the line-profile within the expanding wind effectively “sweeps out” the star’s continuum momentum flux. This makes the driving force a function of the wind ...
Supermassive black holes
... “Stellar mass black holes” – left over from the collapse/implosion of a massive star (about 10 solar masses) “Supermassive black holes” – giants that currently sit at the centers of galaxies (range from millions to billions of solar masses) “Intermediate-mass black holes” – suggested by very recent ...
... “Stellar mass black holes” – left over from the collapse/implosion of a massive star (about 10 solar masses) “Supermassive black holes” – giants that currently sit at the centers of galaxies (range from millions to billions of solar masses) “Intermediate-mass black holes” – suggested by very recent ...
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.