Relativistic jets in microquasars, AGN and GRBs
... Mirabel, Irapuan Rodrigues et al. (A&A 395, 595, 2002) Proper motion with HST + radial velocity from ground RUNAWAY VELOCITY ~120 km/s MOMENTUM = 550 M km/s as in runaway neutron stars ...
... Mirabel, Irapuan Rodrigues et al. (A&A 395, 595, 2002) Proper motion with HST + radial velocity from ground RUNAWAY VELOCITY ~120 km/s MOMENTUM = 550 M km/s as in runaway neutron stars ...
Amanda Boyle Starstuff
... more and more dense and eventually, the core is all helium. No more hydrogen. But pressure has been building. And helium is close enough to hydrogen. With enough pressure the star will use helium to sustain itself. This it does through shell burning, literally a thin shell encompassing the core. Mea ...
... more and more dense and eventually, the core is all helium. No more hydrogen. But pressure has been building. And helium is close enough to hydrogen. With enough pressure the star will use helium to sustain itself. This it does through shell burning, literally a thin shell encompassing the core. Mea ...
S1E4 Extreme Stars
... What holds the white dwarf from collapsing? • The resulting outward pressure which keeps the electrons apart is called electron degeneracy pressure – this is what balances the weight. • Only if more energy drives the electrons into higher energy states, can the density increase. • Adding mass can d ...
... What holds the white dwarf from collapsing? • The resulting outward pressure which keeps the electrons apart is called electron degeneracy pressure – this is what balances the weight. • Only if more energy drives the electrons into higher energy states, can the density increase. • Adding mass can d ...
EMR, Telescopes, Stars, Solar System study guide `14-15
... • Know the meaning of wavelength. • Know that white light is the mixture of all the colors in the visible spectrum. • Know the colors of the spectrum of visible light and the relative wavelengths of them (red long to violet short) and energy (red low to violet high). • Know the three main types of e ...
... • Know the meaning of wavelength. • Know that white light is the mixture of all the colors in the visible spectrum. • Know the colors of the spectrum of visible light and the relative wavelengths of them (red long to violet short) and energy (red low to violet high). • Know the three main types of e ...
printer-friendly sample test questions
... A. is visible during daytime, while other stars are visible only at night. B. has a much hotter temperature than most stars, making it glow brighter. C. emits yellow light, which is several times brighter than other colors. D. is far closer than any other star, which makes it look the brightest. ...
... A. is visible during daytime, while other stars are visible only at night. B. has a much hotter temperature than most stars, making it glow brighter. C. emits yellow light, which is several times brighter than other colors. D. is far closer than any other star, which makes it look the brightest. ...
Stars
... • After billions of years, these stars eventually use up most of their nuclear fuel used for fusion and collapse to form a ____________ ...
... • After billions of years, these stars eventually use up most of their nuclear fuel used for fusion and collapse to form a ____________ ...
Milky Way Bulge
... Milky Way Halo • Globular clusters + field stars • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
... Milky Way Halo • Globular clusters + field stars • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
Motions of the Stars
... • Motion of the Sun through nearby space (towards the constellation of Hercules) • Local rotation of the Milky Way galaxy ...
... • Motion of the Sun through nearby space (towards the constellation of Hercules) • Local rotation of the Milky Way galaxy ...
File
... Use language we can comprehend. Tell us what elements you blend. It gives us strangely little aid, But does tell something in the end. And steadfast as Keats' Eremite, Not even stooping from its sphere, It asks a little of us here. It asks of us a certain height, So when at times the mob is swayed T ...
... Use language we can comprehend. Tell us what elements you blend. It gives us strangely little aid, But does tell something in the end. And steadfast as Keats' Eremite, Not even stooping from its sphere, It asks a little of us here. It asks of us a certain height, So when at times the mob is swayed T ...
Starlight and What it Tells Us
... • How bright a star would be at a distance of 32.6 l.y. (10 parsecs) • Sun: 4.5 (inconspicuous naked-eye star) • Altair: 2.2 • Deneb: -7.1 (bright as crescent moon) – Note: Deneb - Altair about 10 magnitudes = 100 x 100 = 10,000 times ...
... • How bright a star would be at a distance of 32.6 l.y. (10 parsecs) • Sun: 4.5 (inconspicuous naked-eye star) • Altair: 2.2 • Deneb: -7.1 (bright as crescent moon) – Note: Deneb - Altair about 10 magnitudes = 100 x 100 = 10,000 times ...
Test 2 Review Topics
... 38. What is the only direct method for measuring distance? a. Sketch the system that shows this measurement. b. Recall the formula. c. Be able to calculate a distance in parsecs and light years. 39. Differentiate between intrinsic and apparent brightness. 40. Differentiate between luminosity and flu ...
... 38. What is the only direct method for measuring distance? a. Sketch the system that shows this measurement. b. Recall the formula. c. Be able to calculate a distance in parsecs and light years. 39. Differentiate between intrinsic and apparent brightness. 40. Differentiate between luminosity and flu ...
Lecture 9/10 Stellar evolution Ulf Torkelsson 1 Main sequence stars
... Stellar evolution make some very important predictions. Firstly it predicts that heavy stars will evolve more quickly than light star. Secondly it predicts that main sequence stars will evolve into giant stars, in particular red giants. These predictions can be tested by studying stellar clusters, i ...
... Stellar evolution make some very important predictions. Firstly it predicts that heavy stars will evolve more quickly than light star. Secondly it predicts that main sequence stars will evolve into giant stars, in particular red giants. These predictions can be tested by studying stellar clusters, i ...
Lecture 14 - Center for Astrophysics and Space Astronomy CASA
... orbiting, but we can see them both Astrometric Binary proper motion wiggles to show orbit Spectrum Binary spectra of two stars of different type Spectroscopic Binary Doppler shift shows orbital motion Eclipsing Binary light varies Half of all stars are in binaries…. Binary stars are formed at birth. ...
... orbiting, but we can see them both Astrometric Binary proper motion wiggles to show orbit Spectrum Binary spectra of two stars of different type Spectroscopic Binary Doppler shift shows orbital motion Eclipsing Binary light varies Half of all stars are in binaries…. Binary stars are formed at birth. ...
Volume 20 Number 4 March 2012 - Forsyth Astronomical Society
... nearly double the number of verified Kepler planets and triple the number of stars known to have more than one planet that transits (passes in front of) its host star. The planets orbit close to their host stars and range in size from 1.5 times the radius of Earth to larger than Jupiter. They orbit ...
... nearly double the number of verified Kepler planets and triple the number of stars known to have more than one planet that transits (passes in front of) its host star. The planets orbit close to their host stars and range in size from 1.5 times the radius of Earth to larger than Jupiter. They orbit ...
Powerpoint - Astronomy at Swarthmore College
... Hot stars have strong stellar winds (very fast outflows of material from the star’s surface). Our group studies how the magnetic fields of the stars interact with these strong stellar winds. Namely, this interaction occurs via a mechanism called Magnetically-Channeled Wind-Shock, or MCWS. In this mo ...
... Hot stars have strong stellar winds (very fast outflows of material from the star’s surface). Our group studies how the magnetic fields of the stars interact with these strong stellar winds. Namely, this interaction occurs via a mechanism called Magnetically-Channeled Wind-Shock, or MCWS. In this mo ...
the galaxy in which we live - Cosmos
... information for stars in a reduced area of the Galaxy, around the Sun (see drawing). This has been achieved with the data gathered by the Hipparcos satellite, launched by ESA in 1989. But clearly, conclusions about the large-scale structure and dynamics of our Milky Way need a much deeper and more e ...
... information for stars in a reduced area of the Galaxy, around the Sun (see drawing). This has been achieved with the data gathered by the Hipparcos satellite, launched by ESA in 1989. But clearly, conclusions about the large-scale structure and dynamics of our Milky Way need a much deeper and more e ...
All_Stars
... • Medium-mass stars burn H He in their cores while on the main sequence and He C and O while on the horizontal branch • They are not massive enough to ignite C-burning once their He is gone. Their cores contract and heat up until the contraction is stopped by electron degeneracy pressure • At th ...
... • Medium-mass stars burn H He in their cores while on the main sequence and He C and O while on the horizontal branch • They are not massive enough to ignite C-burning once their He is gone. Their cores contract and heat up until the contraction is stopped by electron degeneracy pressure • At th ...
Lecture 22 - Seattle Central
... We know larger stars live fast and die young Talk about what happens to high mass stars from formation to “death” Last weird branch of the HR diagram + neutron stars, pulsars, black holes, core-collapse supernova Chemical enrichment of the Universe ...
... We know larger stars live fast and die young Talk about what happens to high mass stars from formation to “death” Last weird branch of the HR diagram + neutron stars, pulsars, black holes, core-collapse supernova Chemical enrichment of the Universe ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.