Stellar Evolution
... After the red giant phase, massive stars contract again allowing the core to become hot enough to fuse elements into iron. When this occurs the star’s mass is so immense, it can no longer support it causing a sudden, violent, collapse. At this moment, the entire outer portion of the star is blown of ...
... After the red giant phase, massive stars contract again allowing the core to become hot enough to fuse elements into iron. When this occurs the star’s mass is so immense, it can no longer support it causing a sudden, violent, collapse. At this moment, the entire outer portion of the star is blown of ...
Press release - ASTRONOMY GROUP – University of St Andrews
... Researcher Dr Alan Penny will use the brightness of half a dozen stars to refine estimates of how big the Universe actually is. Dr Penny hopes to solve the problem using the ‘extreme precision’ of NASA’s Kepler satellite launched into space last month. Developed for the search for new planets, Keple ...
... Researcher Dr Alan Penny will use the brightness of half a dozen stars to refine estimates of how big the Universe actually is. Dr Penny hopes to solve the problem using the ‘extreme precision’ of NASA’s Kepler satellite launched into space last month. Developed for the search for new planets, Keple ...
A new isolated dSph galaxy near the Local Group
... these spheroidal dwarfs have experienced a disturbance from their neighbours over the last ∼10 Gyr. Apart from the two true isolated spheroidal dwarfs in the vicinity of our Local Group, the local volume within D < 10 Mpc contains one more known isolated dSph object, Apples I. That galaxy was found ...
... these spheroidal dwarfs have experienced a disturbance from their neighbours over the last ∼10 Gyr. Apart from the two true isolated spheroidal dwarfs in the vicinity of our Local Group, the local volume within D < 10 Mpc contains one more known isolated dSph object, Apples I. That galaxy was found ...
Age, EvoluFon, and Size of the Cosmos
... • Protons and neutrons are able to bind together to form nuclei since their binding energy is now greater than the cosmic background radia+on energy, so the background of light (photons) can’t break th ...
... • Protons and neutrons are able to bind together to form nuclei since their binding energy is now greater than the cosmic background radia+on energy, so the background of light (photons) can’t break th ...
The Big Four:
... • Accretion (swallowing) of gas – gas heated by compression/turbulence in strong gravity field X-rays – but need a source of gas • accretion from interstellar matter insignificant • mass transfer in binaries to the rescue ...
... • Accretion (swallowing) of gas – gas heated by compression/turbulence in strong gravity field X-rays – but need a source of gas • accretion from interstellar matter insignificant • mass transfer in binaries to the rescue ...
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
... 1. What are principal points and principal planes? 2. Two lenses of focal lengths 8 cm and 6 cm are placed at a certain distance apart. Calculate the distance between the lenses if they form an achromatic combination. 3. Explain the formation of colours in thin film. 4. Light of wavelength 6000 Å fa ...
... 1. What are principal points and principal planes? 2. Two lenses of focal lengths 8 cm and 6 cm are placed at a certain distance apart. Calculate the distance between the lenses if they form an achromatic combination. 3. Explain the formation of colours in thin film. 4. Light of wavelength 6000 Å fa ...
Astronomy 120
... c) If Sirius had a surface temperature of 15,000 K, what would its luminosity be then? We need to remember that flux has a temperature dependence through the equation.... ...
... c) If Sirius had a surface temperature of 15,000 K, what would its luminosity be then? We need to remember that flux has a temperature dependence through the equation.... ...
Stellar Evolution
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
Recent advances in star
... The formation of massive stars (as opposed to stars like the Sun) is rare and dramatic. It can be studied through the short-lived remnants of the core not incorporated into the massive star. These so-called hot cores contain within them the evaporated material of ices deposited during the collapse, ...
... The formation of massive stars (as opposed to stars like the Sun) is rare and dramatic. It can be studied through the short-lived remnants of the core not incorporated into the massive star. These so-called hot cores contain within them the evaporated material of ices deposited during the collapse, ...
Astro2006_0526
... supercritical accretion disk and jets. Basing on observational data of SS433 and published 2D-simulations of supercritical accretion disks we estimate parameters of the funnel in the disk/wind of SS433 and discuss formation of the jets. We argue that the UV radiation of the SS433 disk (~50000 K, ~10 ...
... supercritical accretion disk and jets. Basing on observational data of SS433 and published 2D-simulations of supercritical accretion disks we estimate parameters of the funnel in the disk/wind of SS433 and discuss formation of the jets. We argue that the UV radiation of the SS433 disk (~50000 K, ~10 ...
NOVAE and SUPERNOVAE
... Occur only in stars whose masses are greater than 8 M. At the end of its life, massive stars form an iron core by fusing silicon. The iron core forms in a few days. Fusion ends at this point. The core has a mass of about 2 M. The iron core cannot support itself and collapses, from a size of ...
... Occur only in stars whose masses are greater than 8 M. At the end of its life, massive stars form an iron core by fusing silicon. The iron core forms in a few days. Fusion ends at this point. The core has a mass of about 2 M. The iron core cannot support itself and collapses, from a size of ...
Great Migrations & other natural history tales
... way M_Jeans changes w.r.t. the fragment mass, Hoyle (1953) arrived at a concept of opacity-limited fragmentation. When heat gets trapped by opacity, Jeans mass ...
... way M_Jeans changes w.r.t. the fragment mass, Hoyle (1953) arrived at a concept of opacity-limited fragmentation. When heat gets trapped by opacity, Jeans mass ...
Slides R. Bower
... into the halo many times. • Wind loading suppresses the formation of dwarf galaxies. – Winds and recycling timescale determine galaxy formation efficiency, not star formation. ...
... into the halo many times. • Wind loading suppresses the formation of dwarf galaxies. – Winds and recycling timescale determine galaxy formation efficiency, not star formation. ...
Linking Asteroids and Meteorites through Reflectance
... What is a galaxy? • Is a massive, gravitationally bound system consisting of stars, gas and dust, and dark matter. Galaxies can contain between ten million and a trillion stars • Dark matter is matter that does not emit or reflect enough radiation to be seen, but whose gravitation effects can be fe ...
... What is a galaxy? • Is a massive, gravitationally bound system consisting of stars, gas and dust, and dark matter. Galaxies can contain between ten million and a trillion stars • Dark matter is matter that does not emit or reflect enough radiation to be seen, but whose gravitation effects can be fe ...
Photonic Devices - Couplers
... • We aim to split two wavelengths from one fibre into two outputs, to separate two channels of information, or combine two into one fibre. • We contrive to make a coupler with a splitting ratio at one desired wavelength of zero (the light all comes out of the primary waveguide) while at the other de ...
... • We aim to split two wavelengths from one fibre into two outputs, to separate two channels of information, or combine two into one fibre. • We contrive to make a coupler with a splitting ratio at one desired wavelength of zero (the light all comes out of the primary waveguide) while at the other de ...
Document
... • We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationall ...
... • We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationall ...
Name Origins: Back to the Beginning Video Questions http://www
... 4. In the modern universe, matter is concentrated into lumps, vast webs of galaxies with hardly anything in the voids between. But what was the nagging problem with the microwave glow that Penzias and Wilson had seen? ...
... 4. In the modern universe, matter is concentrated into lumps, vast webs of galaxies with hardly anything in the voids between. But what was the nagging problem with the microwave glow that Penzias and Wilson had seen? ...
Components of the Milky Way
... Map in Galactic co-ordinates. Infra-red radiation is not strongly absorbed by dust, so looking here at cool stars throughout the Milky Way. ASTR 3730: Fall 2003 ...
... Map in Galactic co-ordinates. Infra-red radiation is not strongly absorbed by dust, so looking here at cool stars throughout the Milky Way. ASTR 3730: Fall 2003 ...
At what intensity is the laser set?
... Though Einstein is most famous for his work in describing relativity in mechanics, his Nobel Prize was for understanding a very simple experiment. It was long understood that if you directed light of a certain wavelength at a piece of metal, it would emit electrons. In classical theory, the energy o ...
... Though Einstein is most famous for his work in describing relativity in mechanics, his Nobel Prize was for understanding a very simple experiment. It was long understood that if you directed light of a certain wavelength at a piece of metal, it would emit electrons. In classical theory, the energy o ...
this PDF file
... In the first attempt only template spectra (with no I2 gas cell inserted) were used for the analysis. However, I2 molecular absorption affects the spectrum up to 660 nm only, so it does not influence 7Li line region. Hence, in the final analysis it was also possible to use the “red” spectra obtained ...
... In the first attempt only template spectra (with no I2 gas cell inserted) were used for the analysis. However, I2 molecular absorption affects the spectrum up to 660 nm only, so it does not influence 7Li line region. Hence, in the final analysis it was also possible to use the “red” spectra obtained ...
Year 9 space ppt
... pressure. The hydrogen atoms are broken into pieces, which smash into each other at high speed. This can make the pieces of hydrogen atoms join together to become helium. This also produces gamma radiation, which travels outward and heat and light is radiated into space in all directions. ...
... pressure. The hydrogen atoms are broken into pieces, which smash into each other at high speed. This can make the pieces of hydrogen atoms join together to become helium. This also produces gamma radiation, which travels outward and heat and light is radiated into space in all directions. ...
Document
... We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationally ...
... We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationally ...
Black Holes and Neutron Stars
... We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationally ...
... We can see X-rays from black holes because? a. X-rays are more energetic than visible light and so can escape from the event horizon. b. X-rays can pass through ordinary matter showing us things we can’t normally see. c. Light given off by objects as they enter the event horizon are gravitationally ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.