Metal-poor Stars
... the lowest metalicities, this fraction is even higher, and all three stars with [Fe/H] < −4.0 are extremely C-rich. The fraction of C-rich stars may also increase with increasing distance from the Galactic plane (Frebel et al. 2006b). Many C-rich stars also show an enhancement in neutron-capture ele ...
... the lowest metalicities, this fraction is even higher, and all three stars with [Fe/H] < −4.0 are extremely C-rich. The fraction of C-rich stars may also increase with increasing distance from the Galactic plane (Frebel et al. 2006b). Many C-rich stars also show an enhancement in neutron-capture ele ...
The MGC - St Andrews Astronomy Group
... • The MGC-BRIGHT is re-calibrating our insight into the local universe • Interpretation of faint galaxy counts and N(z)s is fundamentally flawed until local information is refined • Morphology represents a new research avenue • Elliptical counts could constrain Lambda, if other errors are minimal • ...
... • The MGC-BRIGHT is re-calibrating our insight into the local universe • Interpretation of faint galaxy counts and N(z)s is fundamentally flawed until local information is refined • Morphology represents a new research avenue • Elliptical counts could constrain Lambda, if other errors are minimal • ...
"Cosmic furnaces"()
... actually exist because of other, long dead, stars. The Earth, and almost everything on it, is made from the ashes of giant stars that lived their lives and then exploded billions of years ago. The Solar System itself, to which the Sun, planets and humans belong, came into being around 4.5 billion ye ...
... actually exist because of other, long dead, stars. The Earth, and almost everything on it, is made from the ashes of giant stars that lived their lives and then exploded billions of years ago. The Solar System itself, to which the Sun, planets and humans belong, came into being around 4.5 billion ye ...
The Dynamics of the Galaxies in the Local Group
... The Milky Way Galaxy is Heading for a Major Cosmic Collision Roeland van der Marel (STScI) [based on work with a team of collaborators reported in the Astrophysical Journal July 2012] ...
... The Milky Way Galaxy is Heading for a Major Cosmic Collision Roeland van der Marel (STScI) [based on work with a team of collaborators reported in the Astrophysical Journal July 2012] ...
ppt - SLAC
... 1. Black-body temperature sets the star's color and determines its surface brightness: 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary sta ...
... 1. Black-body temperature sets the star's color and determines its surface brightness: 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary sta ...
Tragedy vs. Hope: What Future in an Open Universe?
... After the red giant phase, the Sun will contract to a white dwarf and will cool out over 1015 years. Since the size of the Sun will then be only about that of Earth, it cannot radiate enough to heat the Earth significantly. The temperature on Earth will approach the frigidity of space at minus 270 d ...
... After the red giant phase, the Sun will contract to a white dwarf and will cool out over 1015 years. Since the size of the Sun will then be only about that of Earth, it cannot radiate enough to heat the Earth significantly. The temperature on Earth will approach the frigidity of space at minus 270 d ...
epsilon Aur
... of the secondary object in the system. The last primary eclipse took place during 1982-84. The years 2009-2011 thus provide a rare opportunity to see Epsilon Aurigae in eclipse. The primary star in the system is a yellow-white supergiant, whose diameter is comparable in size with that of the Earth’s ...
... of the secondary object in the system. The last primary eclipse took place during 1982-84. The years 2009-2011 thus provide a rare opportunity to see Epsilon Aurigae in eclipse. The primary star in the system is a yellow-white supergiant, whose diameter is comparable in size with that of the Earth’s ...
Document
... 4–13×109 years: very slow evolution 13×109 years: slight increase UV (post-AGB stars and very hot white dwarfs) 4000 Å break: after 107 years, opacity H ↔ H–, useful to determine redshift and galaxy type ...
... 4–13×109 years: very slow evolution 13×109 years: slight increase UV (post-AGB stars and very hot white dwarfs) 4000 Å break: after 107 years, opacity H ↔ H–, useful to determine redshift and galaxy type ...
Earth in Space - Learning Outcomes
... Sun revolved around the Earth because that is what it seems to do! Similarly most people were sure that the Earth was flat until there was definite proof from sailors who had ventured round the world and not fallen off! It may prove useful therefore to give a brief historical introduction so that we ...
... Sun revolved around the Earth because that is what it seems to do! Similarly most people were sure that the Earth was flat until there was definite proof from sailors who had ventured round the world and not fallen off! It may prove useful therefore to give a brief historical introduction so that we ...
Glencoe Earth Science
... ball of gas that produces energy by fusing hydrogen into helium in its core. This energy travels outward through the radiation zone and the convection zone. In the convection zone, gases circulate in giant swirls. Finally, energy passes into the Sun’s ...
... ball of gas that produces energy by fusing hydrogen into helium in its core. This energy travels outward through the radiation zone and the convection zone. In the convection zone, gases circulate in giant swirls. Finally, energy passes into the Sun’s ...
Dark Matter— More Than Meets The Eye
... galaxies. Some elliptical galaxies are as spherical as basketballs and others are cigar-shaped. Elliptical galaxies have little or no net rotation since their stars orbit in a more complicated fashion. Applying the same type of galaxy dynamics that works so well for spiral galaxies is not practical ...
... galaxies. Some elliptical galaxies are as spherical as basketballs and others are cigar-shaped. Elliptical galaxies have little or no net rotation since their stars orbit in a more complicated fashion. Applying the same type of galaxy dynamics that works so well for spiral galaxies is not practical ...
C H A P T E R 2
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
The physics and modes of star cluster formation: observations
... clusters independent of distance in the Galaxy with masses estimated as in excess of 104 M . The largest of these appears to be Westerlund 1, whose mass of about 5 × 104 M approaches that of globular clusters (Brandner et al. 2008). Of the nine clusters in her list, six have ages of 3 Myr or less ...
... clusters independent of distance in the Galaxy with masses estimated as in excess of 104 M . The largest of these appears to be Westerlund 1, whose mass of about 5 × 104 M approaches that of globular clusters (Brandner et al. 2008). Of the nine clusters in her list, six have ages of 3 Myr or less ...
Lecture 1
... have smaller fingers -> larger angular measurements. A shorter person will have shorter arms -> smaller angular measurements. (Try to simulate this with your hand and arm!) Based on this, the answer is that we don’t expect them to have different angular measurements. ...
... have smaller fingers -> larger angular measurements. A shorter person will have shorter arms -> smaller angular measurements. (Try to simulate this with your hand and arm!) Based on this, the answer is that we don’t expect them to have different angular measurements. ...
FREE Sample Here
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
Astro 102 Practice Test 3
... ____ 43. The sun makes most of its energy by the CNO cycle. ____ 44. Helium fusion does not begin until the star has entered the giant region of the H-R diagram. ____ 45. Even in degenerate matter, pressure depends on temperature. ____ 46. Young star clusters have bluer turn-off points than old clus ...
... ____ 43. The sun makes most of its energy by the CNO cycle. ____ 44. Helium fusion does not begin until the star has entered the giant region of the H-R diagram. ____ 45. Even in degenerate matter, pressure depends on temperature. ____ 46. Young star clusters have bluer turn-off points than old clus ...
Magnitude Scale and Distance Measurements
... and this give us a way to find the relative intensities of any two stars, based on their apparent magnitudes. Try a few examples: 1. The apparent magnitude of Spica is +0.98, and the apparent magnitude of Sirius A is -1.44. How many times brighter is Sirius A than Spica? 2. The apparent magnitude of ...
... and this give us a way to find the relative intensities of any two stars, based on their apparent magnitudes. Try a few examples: 1. The apparent magnitude of Spica is +0.98, and the apparent magnitude of Sirius A is -1.44. How many times brighter is Sirius A than Spica? 2. The apparent magnitude of ...
Maynooth Lectures 5-6
... If the remnant of a supernova explosion is greater than about three solar masses, there is no mechanism that can stop it collapsing. It becomes so small and dense that its resulting gravitational pull is great enough to stop even radiation, including visible light from escaping. Such objects are kn ...
... If the remnant of a supernova explosion is greater than about three solar masses, there is no mechanism that can stop it collapsing. It becomes so small and dense that its resulting gravitational pull is great enough to stop even radiation, including visible light from escaping. Such objects are kn ...
Chapter 1 Seeing the Light: The Art and Science of Astronomy
... and Saturn. These celestial bodies aren’t wandering through the stars; they orbit around the Sun, our solar system’s central star. Today astronomers know that planets can be smaller or bigger than Earth, but they all are much smaller than the Sun. The planets in our solar system are so close to Eart ...
... and Saturn. These celestial bodies aren’t wandering through the stars; they orbit around the Sun, our solar system’s central star. Today astronomers know that planets can be smaller or bigger than Earth, but they all are much smaller than the Sun. The planets in our solar system are so close to Eart ...
Book: Introduction to Matter (in
... o If you double the volume of your substance, what happens to density? Text: Unit 1-Lesson 2: Properties of Matter 9. What is the difference between a physical and a chemical property of matter? 10. Identify/define various identifiable properties of a substance. Are these physical or chemical ...
... o If you double the volume of your substance, what happens to density? Text: Unit 1-Lesson 2: Properties of Matter 9. What is the difference between a physical and a chemical property of matter? 10. Identify/define various identifiable properties of a substance. Are these physical or chemical ...
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.