Interpretation of the Helix Planetary Nebula using Hydro
... The related Jeans hydrostatic length scale LJHS ≡ [p/ρ2 G]1/2 given in the equation and has been misinterpreted by Jeans 1902 and others as an indication that pressure itself somehow prevents gravitational condensation on all scales smaller than LJ . Although the two scales appear to be equal they a ...
... The related Jeans hydrostatic length scale LJHS ≡ [p/ρ2 G]1/2 given in the equation and has been misinterpreted by Jeans 1902 and others as an indication that pressure itself somehow prevents gravitational condensation on all scales smaller than LJ . Although the two scales appear to be equal they a ...
Exploring the Universe
... – Hottest stars are blue, coolest are red – Hertzspurg-Russel diagram classifies stars • 90° of stars are called the main sequence • Other stars include red giants, supergiants, and dwarfs ...
... – Hottest stars are blue, coolest are red – Hertzspurg-Russel diagram classifies stars • 90° of stars are called the main sequence • Other stars include red giants, supergiants, and dwarfs ...
Telescopes - Murrieta Valley Unified
... telescopes, southern California began to emerge as a major center for astronomy and research. ...
... telescopes, southern California began to emerge as a major center for astronomy and research. ...
PLANETESIMALS TO BROWN DWARFS: What is a Planet?
... Since prehistoric times, people have looked into the night sky and picked out the planets. It was easy: They were the stars that moved (initially the Greeks considered the Sun and Moon to be planets too). Even when Galileo found that the planets are other worlds (and that Earth is one, too), there w ...
... Since prehistoric times, people have looked into the night sky and picked out the planets. It was easy: They were the stars that moved (initially the Greeks considered the Sun and Moon to be planets too). Even when Galileo found that the planets are other worlds (and that Earth is one, too), there w ...
PDF
... who introduced the morphological classification scheme for galaxies still in use today. His “tuning fork” diagram (figure 1) differentiates ellipticals from unbarred and barred spirals, further classified according to the tightness and fine structure of their spiral arms which appears to correlate w ...
... who introduced the morphological classification scheme for galaxies still in use today. His “tuning fork” diagram (figure 1) differentiates ellipticals from unbarred and barred spirals, further classified according to the tightness and fine structure of their spiral arms which appears to correlate w ...
Age-Dating of Young Stars and Stellar Systems
... is very different from, e.g., a globular cluster isochrone where most of the luminosity comes from a small mass interval close to the turn-off mass. In a typical massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute ...
... is very different from, e.g., a globular cluster isochrone where most of the luminosity comes from a small mass interval close to the turn-off mass. In a typical massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute ...
PLANETS
... solar system. Only a minority of the nearby stars are so young. Even for them, planets— and particularly those in the terrestrial planet/asteroidal region—are faint and are lost in the glare of their central stars. However, when bodies in this zone collide, they initiate cascades of further collisio ...
... solar system. Only a minority of the nearby stars are so young. Even for them, planets— and particularly those in the terrestrial planet/asteroidal region—are faint and are lost in the glare of their central stars. However, when bodies in this zone collide, they initiate cascades of further collisio ...
Document
... • In a visual binary, you can see two stars. • However, for most binary stars, their separation is very small compared to their distance, and from Earth they appear to be a single point. • How do you observe these types of binaries? Use spectroscopy! ...
... • In a visual binary, you can see two stars. • However, for most binary stars, their separation is very small compared to their distance, and from Earth they appear to be a single point. • How do you observe these types of binaries? Use spectroscopy! ...
The Submillimeter Frontier: A Space Science Imperative
... of newly synthesized heavy elements. Galaxies grow by collisions and absorption of smaller fragments, with a rate governed by the statistics of the primordial density fluctuations and their growth. Many are very dusty, with star formation obscured by very local dust from young hot stars and supernov ...
... of newly synthesized heavy elements. Galaxies grow by collisions and absorption of smaller fragments, with a rate governed by the statistics of the primordial density fluctuations and their growth. Many are very dusty, with star formation obscured by very local dust from young hot stars and supernov ...
Atmospheric circulations of terrestrial planets orbiting low
... The primary goal of this study is to follow up on the above previous efforts to examine habitability and atmospheric circulation of M-star planets, focusing on their sensitivities to planetary rotation period. Previous modeling studies have shown that changes in rotation period can cause substantial ...
... The primary goal of this study is to follow up on the above previous efforts to examine habitability and atmospheric circulation of M-star planets, focusing on their sensitivities to planetary rotation period. Previous modeling studies have shown that changes in rotation period can cause substantial ...
(NWNH) recommends WFIRST
... To measure the properties of dark energy, WFIRST will employ three different techniques: • carry out a detailed study of weak lensing that will provide distance and rateof-growth information; • monitor distances and expansion rate using baryon acoustic oscillations • detect about 2,000 distant sup ...
... To measure the properties of dark energy, WFIRST will employ three different techniques: • carry out a detailed study of weak lensing that will provide distance and rateof-growth information; • monitor distances and expansion rate using baryon acoustic oscillations • detect about 2,000 distant sup ...
The Milky Way`s Restless Swarms of Stars
... repeated interactions. A cluster might last a objects that arise when stars near a cluster’s holes, astronomers used HST to measure the billion years, 10 billion years, or more, core smash together. Once again, binary stars orbital speeds of stars at the clusters’ cores. depending on its initial mas ...
... repeated interactions. A cluster might last a objects that arise when stars near a cluster’s holes, astronomers used HST to measure the billion years, 10 billion years, or more, core smash together. Once again, binary stars orbital speeds of stars at the clusters’ cores. depending on its initial mas ...
Beers_First_Stars_NIC_School
... Super-Massive Stars W. Aoki, N. Tominaga, T. C. Beers, S. Honda, Y. S. Lee Abstract: Numerical simulations of structure formation in the early Universe predict the formation of some fraction of stars with masses several hundred times the solar mass. No clear evidence of supernovae from such supermas ...
... Super-Massive Stars W. Aoki, N. Tominaga, T. C. Beers, S. Honda, Y. S. Lee Abstract: Numerical simulations of structure formation in the early Universe predict the formation of some fraction of stars with masses several hundred times the solar mass. No clear evidence of supernovae from such supermas ...
Tod E. Strohmayer - UCLA Physics & Astronomy
... • Eddington limited bursts; LEdd = 4pR2 s TEddeff4 = g(M, R) • For most likely rotation rates, line widths are rotationally dominated, measure line widths and can constrain R (if W known). • If detect several absorption lines in a series (Ha, and Hb, for example), can constrain m/R2 . ...
... • Eddington limited bursts; LEdd = 4pR2 s TEddeff4 = g(M, R) • For most likely rotation rates, line widths are rotationally dominated, measure line widths and can constrain R (if W known). • If detect several absorption lines in a series (Ha, and Hb, for example), can constrain m/R2 . ...
- Cosmotography
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
Living Things - Fairfield-Suisun Unified School District
... different images. The images are shown at different scales. ...
... different images. The images are shown at different scales. ...
PH607lec08
... between recession velocity and distance. (Type Ia supernova). The Hubble law defines a special frame of reference at any point in the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts ...
... between recession velocity and distance. (Type Ia supernova). The Hubble law defines a special frame of reference at any point in the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts ...
Word version of Episode 704
... External reference This activity is taken from Advancing Physics, chapter 12, 160O ...
... External reference This activity is taken from Advancing Physics, chapter 12, 160O ...
WORD - Astrophysics
... (probably crucial) role in determining the morphological type of a given galaxy, but we do not know what merged, or when it merged -- how do the merging histories of non-baryonic dark matter and of baryons compare? Similarly, stars clearly form(ed) at some rate from gas, but at what rate, where, wit ...
... (probably crucial) role in determining the morphological type of a given galaxy, but we do not know what merged, or when it merged -- how do the merging histories of non-baryonic dark matter and of baryons compare? Similarly, stars clearly form(ed) at some rate from gas, but at what rate, where, wit ...
STEPHAN`S QUINTET
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
Senior thesis - University of Texas Astronomy Home Page
... flux of the white dwarf on the left corresponds to surface brightness changes modeled on the right. Calculations and figure courtesy of Mike Montgomery white dwarf, slight changes in temperature and pressure cause the fluid to vertically move up or down. In attempting to correct for this motion, thi ...
... flux of the white dwarf on the left corresponds to surface brightness changes modeled on the right. Calculations and figure courtesy of Mike Montgomery white dwarf, slight changes in temperature and pressure cause the fluid to vertically move up or down. In attempting to correct for this motion, thi ...
CENTRAL TEXAS COLLEGE
... Each part of the course is not self-contained. You may expect that basic concepts presented at the beginning of the course will be built upon day by day, added to, expanded upon, etc., so that with time you will have both specific and overall understandings. It is important to link together each pie ...
... Each part of the course is not self-contained. You may expect that basic concepts presented at the beginning of the course will be built upon day by day, added to, expanded upon, etc., so that with time you will have both specific and overall understandings. It is important to link together each pie ...
Baryons at Low Densities: The Stellar Halos around Galaxies
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... correlated with dark matter halo mass and so the best link to the underlying cosmological model. A survey must be large (∼ few ×105 galaxies) in order to disentangle covariances in the physical properties of galaxies. One reason it is so difficult to understand how galaxies form is because almost al ...
... correlated with dark matter halo mass and so the best link to the underlying cosmological model. A survey must be large (∼ few ×105 galaxies) in order to disentangle covariances in the physical properties of galaxies. One reason it is so difficult to understand how galaxies form is because almost al ...
1 Introduction - Wiley-VCH
... work in any kind of extragalactic source, and are thus widely used as constraints in models of galaxy formation and evolution. Because of their tightness, they are also powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and ...
... work in any kind of extragalactic source, and are thus widely used as constraints in models of galaxy formation and evolution. Because of their tightness, they are also powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.