Homework #1 - Rutgers Physics
... sphere assuming (a) a density which is independent of the distance from the center and (b) a density which increases towards the cener according to ρ(r) = ρc (1 − r/R). In both cases (a) and (b), also write down the average internal pressure needed for hydrostatic equilibrium and determine how the p ...
... sphere assuming (a) a density which is independent of the distance from the center and (b) a density which increases towards the cener according to ρ(r) = ρc (1 − r/R). In both cases (a) and (b), also write down the average internal pressure needed for hydrostatic equilibrium and determine how the p ...
on the mass distribution of stars in the solar neighbourhood
... After accepting the final results one meets the question how reliable they are. Here we have three main items to consider. The first concerns the fraction of low-mass stars because if it is not so high, as found in this paper, then the present results become doubtful. A comparison can be done with I ...
... After accepting the final results one meets the question how reliable they are. Here we have three main items to consider. The first concerns the fraction of low-mass stars because if it is not so high, as found in this paper, then the present results become doubtful. A comparison can be done with I ...
The Milky Way galaxy Contents Summary
... name derives from its only moderately non-spherical shape. The disc is a highly flattened structure in which stars move on nearly circular orbits around the centre and never go far from the system’s equatorial plane. The morphological type of a galaxy is determined by the relative contributions of t ...
... name derives from its only moderately non-spherical shape. The disc is a highly flattened structure in which stars move on nearly circular orbits around the centre and never go far from the system’s equatorial plane. The morphological type of a galaxy is determined by the relative contributions of t ...
Astronomy 200 Problem Set No
... forms stars. Assume that 25% of the cloud’s mass goes into stars, a high but not unreasonable star formation efficiency. You may further assume this cloud only forms relatively high mass stars – M ≥ 3.0MSun up to a maximum mass of 30MSun . If the newly formed stars are distributed in mass according ...
... forms stars. Assume that 25% of the cloud’s mass goes into stars, a high but not unreasonable star formation efficiency. You may further assume this cloud only forms relatively high mass stars – M ≥ 3.0MSun up to a maximum mass of 30MSun . If the newly formed stars are distributed in mass according ...
SL2 IIIC Carter 280911 - Particle Solids Interactions group
... umbra reduces the flow of hot material to that region of the Photosphere. • Alternatively, strong magnetic fields enhance flow of heat but converts about 80% into “hydromagnetic waves” which propagate through the Photosphere without dissipating significant amounts of energy. Instead, contributes to ...
... umbra reduces the flow of hot material to that region of the Photosphere. • Alternatively, strong magnetic fields enhance flow of heat but converts about 80% into “hydromagnetic waves” which propagate through the Photosphere without dissipating significant amounts of energy. Instead, contributes to ...
Astronomy 401 Lecture 1 Overview of the Universe 1 Class overview
... has the same temperature as the surface of a star, and then it would emit as much light as it absorbs and glow as brightly as the stars. • Assumed that number density and mean luminosity of stars are constant throughout the universe; distant stars might be less numerous or less luminous than nearby ...
... has the same temperature as the surface of a star, and then it would emit as much light as it absorbs and glow as brightly as the stars. • Assumed that number density and mean luminosity of stars are constant throughout the universe; distant stars might be less numerous or less luminous than nearby ...
ASTR3007/4007/6007, Class 1: Observing the Stars 23 February
... two energy levels in some atom or molecule in the stellar atmosphere. Those photons are strongly absorbed by those atoms or molecules, leading to a drop in the light we see coming out of the star at those wavelengths. Although this is not the case for the Sun, in some stars there are strong emissio ...
... two energy levels in some atom or molecule in the stellar atmosphere. Those photons are strongly absorbed by those atoms or molecules, leading to a drop in the light we see coming out of the star at those wavelengths. Although this is not the case for the Sun, in some stars there are strong emissio ...
Lab: Heliocentric Parallax
... between 2 virtual photo taken six months apart. As you blink between the photos, you’ll notice several stars shift. These are the stars for which you will be measuring the parallax and calculating the distances. We’ll be using a grid overlaid on the photos to measure the shift, and the grid is not m ...
... between 2 virtual photo taken six months apart. As you blink between the photos, you’ll notice several stars shift. These are the stars for which you will be measuring the parallax and calculating the distances. We’ll be using a grid overlaid on the photos to measure the shift, and the grid is not m ...
Astrophysics Questions (DRAFT)
... 94. Sketch a typical cooling function (T ) for di use interstellar gas and identify its prominent features. Overplot a hypothetical heating curve and show how to identify points of thermal equilibrium and their stability. 95. Explain the physics of 21 cm radio emission from neutral hydrogen atoms. ...
... 94. Sketch a typical cooling function (T ) for di use interstellar gas and identify its prominent features. Overplot a hypothetical heating curve and show how to identify points of thermal equilibrium and their stability. 95. Explain the physics of 21 cm radio emission from neutral hydrogen atoms. ...
Stars A globular cluster is a tightly grouped swarm of stars held
... The distance from the sun to Proxima Centauri is more than 25 trillion miles (40 trillion kilometers). This distance is so great that light takes 4.2 years to travel between the two stars. Scientists say that Proxima Centauri is 4.2 light-years from the sun. One light-year, the distance that light t ...
... The distance from the sun to Proxima Centauri is more than 25 trillion miles (40 trillion kilometers). This distance is so great that light takes 4.2 years to travel between the two stars. Scientists say that Proxima Centauri is 4.2 light-years from the sun. One light-year, the distance that light t ...
Burgess_final - University of Hertfordshire
... "There has been some controversy about identifying young, low mass brown dwarfs in this region. An object of a similar mass was discovered in 2002, but some groups have argued that it is an older, cooler brown dwarf in the foreground coinciding with the line of sight. The fact that we have detected ...
... "There has been some controversy about identifying young, low mass brown dwarfs in this region. An object of a similar mass was discovered in 2002, but some groups have argued that it is an older, cooler brown dwarf in the foreground coinciding with the line of sight. The fact that we have detected ...
Circumstellar interaction in supernovae
... Few months to few years timescale Energy emitted 1051 ergs (1029 times more than an atmospheric nuclear explosion) Shines brighter than the host Galaxy As much energy in 1 month as sun in ~1 billion years In universe 8 supernova explosions every second Thermonuclear and gravitational collapse ...
... Few months to few years timescale Energy emitted 1051 ergs (1029 times more than an atmospheric nuclear explosion) Shines brighter than the host Galaxy As much energy in 1 month as sun in ~1 billion years In universe 8 supernova explosions every second Thermonuclear and gravitational collapse ...
Chapter 29: Life in the Universe
... Life on Earth is based on organic molecules: carbon-based molecules with hydrogen, nitrogen, oxygen, or a few other elements. Organic molecules have been found in clouds of interstellar gas and dust! Starting from these organic molecules, chemists formed amino acids in a simple apparatus that mimics ...
... Life on Earth is based on organic molecules: carbon-based molecules with hydrogen, nitrogen, oxygen, or a few other elements. Organic molecules have been found in clouds of interstellar gas and dust! Starting from these organic molecules, chemists formed amino acids in a simple apparatus that mimics ...
The Galactic Halo
... Stars with enhanced abundances of carbon (CEMP stars), and other light elements (including the lowest [Fe/H] star yet discovered), and lack of over-abundances of neutron-capture elements (CEMP-no stars) Associated with production by “faint SNe” – progenitors with mass on the order of 10-100 Mo under ...
... Stars with enhanced abundances of carbon (CEMP stars), and other light elements (including the lowest [Fe/H] star yet discovered), and lack of over-abundances of neutron-capture elements (CEMP-no stars) Associated with production by “faint SNe” – progenitors with mass on the order of 10-100 Mo under ...
5 April 2012—Gravitational waves 12 Apr 2012 Radiation from a source
... The behavior P ∂ P-53 will be discussed the next class. Q: Simplicio: If a system loses energy, it should slow down, not speed up. What is wrong with Simplicio's thinking when applied to the binary pulsar? dPdt ...
... The behavior P ∂ P-53 will be discussed the next class. Q: Simplicio: If a system loses energy, it should slow down, not speed up. What is wrong with Simplicio's thinking when applied to the binary pulsar? dPdt ...
Black Hole Sun: A Total Eclipse Free Public Lecture about Eclipses
... Pickering’s discovery We are interpreting E. C. Pickering’s (A. J. Cannon’s boss) spectra of Mizar (a star in the Big Dipper) in 1889. 1. Devise a model for Mizar that explains the data. How can a star move at two speeds? (5 min) ...
... Pickering’s discovery We are interpreting E. C. Pickering’s (A. J. Cannon’s boss) spectra of Mizar (a star in the Big Dipper) in 1889. 1. Devise a model for Mizar that explains the data. How can a star move at two speeds? (5 min) ...
July 2013 - Skyscrapers, Inc.
... towards the north is Perseus. Between the two patterns we can easily see the Double Cluster with the naked eye. While binoculars will enhance the view, a telescope under low magnification will reveal the magnificent beauty of this open cluster of stars. Our next stop “down” (south) the Milky Way is ...
... towards the north is Perseus. Between the two patterns we can easily see the Double Cluster with the naked eye. While binoculars will enhance the view, a telescope under low magnification will reveal the magnificent beauty of this open cluster of stars. Our next stop “down” (south) the Milky Way is ...
Planet Building Part 4
... rare, though we know they are common (in our SS and in others). • To solve the Jovian problem, astronomers have posited that Jovian formation was from direct collapse. – In other words, the condensation and accretion ...
... rare, though we know they are common (in our SS and in others). • To solve the Jovian problem, astronomers have posited that Jovian formation was from direct collapse. – In other words, the condensation and accretion ...
North Star pulses brightly with constant change
... People believe a lot of things that are simply untrue. Like that it's cold in winter because Earth is farther from the sun. Or that Polaris, the "North Star," is the brightest star in the sky. Polaris is only the 49th-brightest star visible from Earth. But two things make Polaris special. One is tha ...
... People believe a lot of things that are simply untrue. Like that it's cold in winter because Earth is farther from the sun. Or that Polaris, the "North Star," is the brightest star in the sky. Polaris is only the 49th-brightest star visible from Earth. But two things make Polaris special. One is tha ...
APS Centenary Poster - Bartol Research Institute
... But massive stars show the strongest winds, with speeds sometimes exceeding 3000 km/s, and mass loss rates up to a billion times the solar wind, i.e. ~ 10-5 MO/yr ! This is large enough that, during the course of their relatively brief (~107 yr) evolutionary lifetime, such massive stars can be str ...
... But massive stars show the strongest winds, with speeds sometimes exceeding 3000 km/s, and mass loss rates up to a billion times the solar wind, i.e. ~ 10-5 MO/yr ! This is large enough that, during the course of their relatively brief (~107 yr) evolutionary lifetime, such massive stars can be str ...
Search for Life in the Universe
... • Indirect detection of effect on parent star – Extrasolar planets around main sequence stars discovered in 1995 – Planets around neutron stars discovered previously – Spectroscopy (>100 cases): detect Doppler shift of stellar motion around center of mass – Astrometry (1 case): detect angular motion ...
... • Indirect detection of effect on parent star – Extrasolar planets around main sequence stars discovered in 1995 – Planets around neutron stars discovered previously – Spectroscopy (>100 cases): detect Doppler shift of stellar motion around center of mass – Astrometry (1 case): detect angular motion ...
doc - Jnoodle
... The stars "near" us form the Milky Way, a galaxy containing ca 100 billion stars shaped like a disc with some spiral arms. The size of our galaxy is the order of magnitude 100 000 ly and it rotates around its center in ca 200 - 300 million years. Except start there is mostly thin interstellar matter ...
... The stars "near" us form the Milky Way, a galaxy containing ca 100 billion stars shaped like a disc with some spiral arms. The size of our galaxy is the order of magnitude 100 000 ly and it rotates around its center in ca 200 - 300 million years. Except start there is mostly thin interstellar matter ...
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.