Stars: some basic characteristics
... Recall that the emission/absorption features can be taken as chemical fingerprints: for instance, if there is a strong Hydrogen absorption feature, then you would expect that there is a lot of hydrogen in the star. ...
... Recall that the emission/absorption features can be taken as chemical fingerprints: for instance, if there is a strong Hydrogen absorption feature, then you would expect that there is a lot of hydrogen in the star. ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
File
... You put the styrofoam ball at the center, didn't you? The name of this "ball" is the Bulge. Old stars get together and make the Bulge. In the Bulge there is little gas which is the material of stars. In contrast, there is a lot of gas and many stars are being formed on the disk now. 3. Objects you p ...
... You put the styrofoam ball at the center, didn't you? The name of this "ball" is the Bulge. Old stars get together and make the Bulge. In the Bulge there is little gas which is the material of stars. In contrast, there is a lot of gas and many stars are being formed on the disk now. 3. Objects you p ...
Lecture 14
... Rotation also causes jets of matter to shoot out along the rotation axis. These are probably due to magnetic fields in the new star. We usually only see these jets in new stars. ...
... Rotation also causes jets of matter to shoot out along the rotation axis. These are probably due to magnetic fields in the new star. We usually only see these jets in new stars. ...
3.1 Introduction
... In the case of a halo globular cluster, with little foreground contamination, the density of points in the HR diagram approximately reflects the length of time a star spends in different evolutionary stages. Stars spend most of their lives on the main sequence (MS), burning hydrogen in their cores. ...
... In the case of a halo globular cluster, with little foreground contamination, the density of points in the HR diagram approximately reflects the length of time a star spends in different evolutionary stages. Stars spend most of their lives on the main sequence (MS), burning hydrogen in their cores. ...
charts_set_9
... Composition unknown. Probably mostly exotic particles that hardly interact with ordinary matter at all (except gravity). Small fraction may be brown dwarfs, dead white dwarfs. Most likely it's a dark halo surrounding the Milky Way. ...
... Composition unknown. Probably mostly exotic particles that hardly interact with ordinary matter at all (except gravity). Small fraction may be brown dwarfs, dead white dwarfs. Most likely it's a dark halo surrounding the Milky Way. ...
Archaeology of the Milky Way - Max-Planck
... a diameter of around 100,000 lightyears. It is subdivided into three regions. The very flat disk, just 2,000 light-years thick, is home to around 80 percent of all stars, and has a total mass of about 50 billion solar masses, along with clouds of dust and gas. Our Sun – only 80 light-years away from ...
... a diameter of around 100,000 lightyears. It is subdivided into three regions. The very flat disk, just 2,000 light-years thick, is home to around 80 percent of all stars, and has a total mass of about 50 billion solar masses, along with clouds of dust and gas. Our Sun – only 80 light-years away from ...
Practice Questions for Exam 3
... Which of the following is the best answer to the question "Why does the Sun shine?" A. As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. B. The Sun initially began making energy through c ...
... Which of the following is the best answer to the question "Why does the Sun shine?" A. As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. B. The Sun initially began making energy through c ...
Lecture16
... Imagine a pipe as wide as a state and as long as half the Earth. Now imagine that this pipe is filled with hot gas moving 50,000 kilometers per hour. Further imagine that this pipe is not made of metal but a transparent magnetic field. You are envisioning just one of thousands of young spicules on ...
... Imagine a pipe as wide as a state and as long as half the Earth. Now imagine that this pipe is filled with hot gas moving 50,000 kilometers per hour. Further imagine that this pipe is not made of metal but a transparent magnetic field. You are envisioning just one of thousands of young spicules on ...
File
... The collapsing core of neutrons overshoots its equilibrium size and rebounds outward, like someone jumping on a trampoline. The rebounding core collides with the inward-falling surrounding layers and propels them outward, greatly assisted by the plentiful neutrinos (only a very tiny fraction of whic ...
... The collapsing core of neutrons overshoots its equilibrium size and rebounds outward, like someone jumping on a trampoline. The rebounding core collides with the inward-falling surrounding layers and propels them outward, greatly assisted by the plentiful neutrinos (only a very tiny fraction of whic ...
LIFE CYCLE OF STARS
... Planetary Nebula-a shell of gas discarded by a medium star white dwarf-A star that has exhausted most or all of its nuclear fuel and has collapsed to a very ...
... Planetary Nebula-a shell of gas discarded by a medium star white dwarf-A star that has exhausted most or all of its nuclear fuel and has collapsed to a very ...
O star
... spectral type and the luminosity class of a star from its spectrum. This is extraordinarily valuable, as it means that, just from the spectrum of a star, one can plot it in on the H-R diagram. BUT: if you can plot a star on the H-R diagram, you know its absolute magnitude! And if you know its absolu ...
... spectral type and the luminosity class of a star from its spectrum. This is extraordinarily valuable, as it means that, just from the spectrum of a star, one can plot it in on the H-R diagram. BUT: if you can plot a star on the H-R diagram, you know its absolute magnitude! And if you know its absolu ...
ASTRONOMY 120
... As a dying star sheds its outer layers to make a planetary nebula, the dead core of the star is exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million tim ...
... As a dying star sheds its outer layers to make a planetary nebula, the dead core of the star is exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million tim ...
Stardeath
... C. Neutron star, white dwarf, brown dwarf. D. White dwarf, brown dwarf, neutron star. 2. The outward force keeping a degenerate white dwarf star from collapsing is: A. degenerate electron "gas" pressure. B. internal pressure from heat. C. its rapid spinning. D. pressure from the outward flow of neut ...
... C. Neutron star, white dwarf, brown dwarf. D. White dwarf, brown dwarf, neutron star. 2. The outward force keeping a degenerate white dwarf star from collapsing is: A. degenerate electron "gas" pressure. B. internal pressure from heat. C. its rapid spinning. D. pressure from the outward flow of neut ...
“Crossroads of Astronomy.” Talk about Five Remarkable
... Classified 5,000 stars per month between 1911 and 1915. She would examine the photographic plate and call out a letter for each spectrum to an assistant. Annie achieved a rate of more than 3 stars a minute. Annie used Williamina Fleming’s system, rearranged it, and introduced decimal subdivisions. T ...
... Classified 5,000 stars per month between 1911 and 1915. She would examine the photographic plate and call out a letter for each spectrum to an assistant. Annie achieved a rate of more than 3 stars a minute. Annie used Williamina Fleming’s system, rearranged it, and introduced decimal subdivisions. T ...
I CAN SEE THE STARS IN YOUR EYES
... at this speed, the trip from Earth to the sun, a distance of 93 million miles, would take about 8 minutes, not very long for such a long trip! Yet, to get to the next closest star, Proxima Centauri, would take 4.2 years. “Hmmm…,” you think to yourself, “that might be an interesting fact to include i ...
... at this speed, the trip from Earth to the sun, a distance of 93 million miles, would take about 8 minutes, not very long for such a long trip! Yet, to get to the next closest star, Proxima Centauri, would take 4.2 years. “Hmmm…,” you think to yourself, “that might be an interesting fact to include i ...
What do “yellowballs” have to do with the birth of new stars?
... Using a different combination of infrared colors, the yellowballs would not pop out. Ideally, astronomers want to look at as many different colors of light as they can, but the reality is they can not build instruments that do everything. Before building astronomical instruments, scientists need to ...
... Using a different combination of infrared colors, the yellowballs would not pop out. Ideally, astronomers want to look at as many different colors of light as they can, but the reality is they can not build instruments that do everything. Before building astronomical instruments, scientists need to ...
Star A
... Most stars are members of multiple-star systems—groups of two or more stars in orbit around one another. The majority are found in binary-star systems, which consist of two stars in orbit about their common center of mass, held together by their mutual gravitational attraction. (The Sun is not part ...
... Most stars are members of multiple-star systems—groups of two or more stars in orbit around one another. The majority are found in binary-star systems, which consist of two stars in orbit about their common center of mass, held together by their mutual gravitational attraction. (The Sun is not part ...
Bluffing your way in Astronomy: Taurus
... away any such residue, so we are actually seeing part of a cloud of interstellar dust and gas, called the Taurus Dark Cloud, which by coincidence lies between us and the cluster. The Pleiades are about 380 light years from Earth. Most of the stars in the Pleiades are spectral classes A and B (big, b ...
... away any such residue, so we are actually seeing part of a cloud of interstellar dust and gas, called the Taurus Dark Cloud, which by coincidence lies between us and the cluster. The Pleiades are about 380 light years from Earth. Most of the stars in the Pleiades are spectral classes A and B (big, b ...
common constellations
... Members of the Underground Railroad were fully aware of the predicament of fleeing slaves. About 1831 the Railroad began to send travelers into the South to secretly teach slaves specific routes they could navigate using Polaris. By the beginning of the Civil War in 1861, about 500 people a year wer ...
... Members of the Underground Railroad were fully aware of the predicament of fleeing slaves. About 1831 the Railroad began to send travelers into the South to secretly teach slaves specific routes they could navigate using Polaris. By the beginning of the Civil War in 1861, about 500 people a year wer ...
News Release - האוניברסיטה העברית
... The galaxies are the building blocks of the Universe. Each of them comprises some hundred billion radiant stars, such as our sun, which extend across about 50,000 light years. Every galaxy is embedded in a spherical halo made of dark matter that cannot be seen but is detected through its massive gra ...
... The galaxies are the building blocks of the Universe. Each of them comprises some hundred billion radiant stars, such as our sun, which extend across about 50,000 light years. Every galaxy is embedded in a spherical halo made of dark matter that cannot be seen but is detected through its massive gra ...
Chapter 29: Stars - Mr. Pelton Science
... • Most stars are currently classified using the letters O, B, A, F, G, K, and M, with the O class stars being the hottest and the M class stars being the coolest. ...
... • Most stars are currently classified using the letters O, B, A, F, G, K, and M, with the O class stars being the hottest and the M class stars being the coolest. ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.