3P15.pdf
... High resolution spectra of 10 UV Cet type flare stars have been analysed in this work. Age, line profiles, rotation and flux-flux relationships have been studied and the results have been compared with the ones obtained by López-Santiago et al (2004a, b) for a sample of 144 stars, with spectral type ...
... High resolution spectra of 10 UV Cet type flare stars have been analysed in this work. Age, line profiles, rotation and flux-flux relationships have been studied and the results have been compared with the ones obtained by López-Santiago et al (2004a, b) for a sample of 144 stars, with spectral type ...
Chapter 14 – Chemical Analysis
... At what line strength do lines become sensitive to microturbulence? Why is it hard to determine abundances from lines on the “flat part” of the curve of growth? ...
... At what line strength do lines become sensitive to microturbulence? Why is it hard to determine abundances from lines on the “flat part” of the curve of growth? ...
Post Main Sequence Evolution Since a star`s luminosity on the main
... phase continues with the shell moving outward in mass, until the core contains ∼ 10% of the stellar mass (point 4). This is the Schönberg-Chandrasekhar limit. Stars with larger (by mass fraction) cores will reach this point faster than stars with small cores.) • Light elements such as lithium, boro ...
... phase continues with the shell moving outward in mass, until the core contains ∼ 10% of the stellar mass (point 4). This is the Schönberg-Chandrasekhar limit. Stars with larger (by mass fraction) cores will reach this point faster than stars with small cores.) • Light elements such as lithium, boro ...
Hosclaw
... • Sensitivity decline and Spica variability • Alternative origin of the FUV flat-field, ...
... • Sensitivity decline and Spica variability • Alternative origin of the FUV flat-field, ...
X-ray Emission from Massive Stars
... Hot, Massive Stars Stars range in (surface) temperature from about 3500 K to 50,000 K Their temperatures correlate with mass and luminosity (massive stars are hot and very bright): a 50,000 K star has a million times the luminosity of the Sun (Tsun = 6000 K) Stars hotter than about 8000 K do not ha ...
... Hot, Massive Stars Stars range in (surface) temperature from about 3500 K to 50,000 K Their temperatures correlate with mass and luminosity (massive stars are hot and very bright): a 50,000 K star has a million times the luminosity of the Sun (Tsun = 6000 K) Stars hotter than about 8000 K do not ha ...
Astronomy 112: The Physics of Stars Class 18 Notes: Neutron Stars
... where we have dropped the constants of order unity. Thus the angular velocity of the core is enhanced by the same factor of ∼ 106 as the magnetic field. The period, which is simply P = 2π/ω, decreases by the same factor. As with the magnetic field, we’re not exactly sure what rotation rates should b ...
... where we have dropped the constants of order unity. Thus the angular velocity of the core is enhanced by the same factor of ∼ 106 as the magnetic field. The period, which is simply P = 2π/ω, decreases by the same factor. As with the magnetic field, we’re not exactly sure what rotation rates should b ...
Stellar Structure and Evolution II
... fusion rate – Higher mass stars have hotter cores, faster fusion rates, greater luminosities, and shorter ...
... fusion rate – Higher mass stars have hotter cores, faster fusion rates, greater luminosities, and shorter ...
The Crown of the North Wind
... October 27th to November 10th If you were born between these dates, your guiding star is Alphecca, or Gemma, the brilliant blue-white star that is the central 'gem' in the arc of seven stars of Corona Borealis, which represents the crown of red, Indian jewels and fiery gold of Ariadne's Crown. Behin ...
... October 27th to November 10th If you were born between these dates, your guiding star is Alphecca, or Gemma, the brilliant blue-white star that is the central 'gem' in the arc of seven stars of Corona Borealis, which represents the crown of red, Indian jewels and fiery gold of Ariadne's Crown. Behin ...
Document
... – two stars in a binary system can be close enough to transfer mass from one to the other – gaining or losing mass will change the life path of a star ...
... – two stars in a binary system can be close enough to transfer mass from one to the other – gaining or losing mass will change the life path of a star ...
ASTR 104 - Wagner Homework 1
... 1. The first neutron stars that were discovered were all pulsars. Explain why we do not see ALL neutron stars as pulsars. 2. A pulsar was observed to have a planetary system orbiting it. Explain why this was a great surprise to astronomers. 3. Explain what we mean when we discuss the event horizon o ...
... 1. The first neutron stars that were discovered were all pulsars. Explain why we do not see ALL neutron stars as pulsars. 2. A pulsar was observed to have a planetary system orbiting it. Explain why this was a great surprise to astronomers. 3. Explain what we mean when we discuss the event horizon o ...
Here
... solar masses, the core will be too massive to form a white dwarf, since at that stage the gravity is stronger than the electron degeneracy pressure. The collapse continues. • Protons and electrons are fused to form neutrons and neutrinos. The core collapses to a very tiny size, liberating a huge amo ...
... solar masses, the core will be too massive to form a white dwarf, since at that stage the gravity is stronger than the electron degeneracy pressure. The collapse continues. • Protons and electrons are fused to form neutrons and neutrinos. The core collapses to a very tiny size, liberating a huge amo ...
Andromeda Nebula Lies Outside Milky Way Galaxy
... "Red Shift" is Proof of Einstein's General Theory Using the 100-inch Hooker Telescope at Mount Wilson Observatory, Dr. Edwin Hubble has studied many spiral nebulae. He has discovered they are moving away from us at a rapid pace. This is strong evidence of an expanding universe. He has further determ ...
... "Red Shift" is Proof of Einstein's General Theory Using the 100-inch Hooker Telescope at Mount Wilson Observatory, Dr. Edwin Hubble has studied many spiral nebulae. He has discovered they are moving away from us at a rapid pace. This is strong evidence of an expanding universe. He has further determ ...
May 2008 - Skyscrapers, Inc.
... face east. The constellation Aquarius, from where the meteors will appear to radiate, only rises low in the east-southeast around that time. As the morning progresses, Aquarius will rise higher into the sky, and with it the number of meteors should increase as well. Normally about 15-20 meteors per ...
... face east. The constellation Aquarius, from where the meteors will appear to radiate, only rises low in the east-southeast around that time. As the morning progresses, Aquarius will rise higher into the sky, and with it the number of meteors should increase as well. Normally about 15-20 meteors per ...
supernova remnants: a link between massive stars and the
... After the explosion the information comes from the study of light curves and of early and late times spectra. On these basis, SNe from massive stars can be divided into four categories, depending on the amount of mass lost during the stellar evolution and the radius of the progenitor star. Although ...
... After the explosion the information comes from the study of light curves and of early and late times spectra. On these basis, SNe from massive stars can be divided into four categories, depending on the amount of mass lost during the stellar evolution and the radius of the progenitor star. Although ...
The Distances to the Stars
... Note that measuring such motions requires the existence of a fixed reference frame, provided by celestial objects whose motions are not detectable. Usually very distant stars will do, but for the most accurate astrometry astronomers use distant galaxies or quasars as reference points. Two thousand y ...
... Note that measuring such motions requires the existence of a fixed reference frame, provided by celestial objects whose motions are not detectable. Usually very distant stars will do, but for the most accurate astrometry astronomers use distant galaxies or quasars as reference points. Two thousand y ...
Chapter 16 Lives of the Stars (Low Mass)
... The Horizontal branch is a stage of evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core and by hydrogen fusion in a shell around the core. The thermostat is temporarily fixed. ...
... The Horizontal branch is a stage of evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core and by hydrogen fusion in a shell around the core. The thermostat is temporarily fixed. ...
starwalk2 manual en
... Star Walk 2™ is a stargazing application for amateurs, professionals, and kids who are eager to learn. The app allows users to identify about 250,000 heavenly bodies and learn about them, watch moon phases, meteor showers, see daily sunset and sunrise times, elevation angle, and daily hours of sunli ...
... Star Walk 2™ is a stargazing application for amateurs, professionals, and kids who are eager to learn. The app allows users to identify about 250,000 heavenly bodies and learn about them, watch moon phases, meteor showers, see daily sunset and sunrise times, elevation angle, and daily hours of sunli ...
Galaxies
... protogalactic clouds that were able to cool and form stars before gas settled into a disk ...
... protogalactic clouds that were able to cool and form stars before gas settled into a disk ...
JWST_eye - University of Arizona
... In daylight the opening in the human eye is about 1-2 millimeters across. At night the eye becomes “dark adapted” and the opening enlarges to about 6 millimeters to collect more light. The opening of JWST is 6 meters across, about 1000 times larger, so it lets in more light than the naked eye. Since ...
... In daylight the opening in the human eye is about 1-2 millimeters across. At night the eye becomes “dark adapted” and the opening enlarges to about 6 millimeters to collect more light. The opening of JWST is 6 meters across, about 1000 times larger, so it lets in more light than the naked eye. Since ...
Project 8 : Stellar Spectra: Classification
... the gas is hot enough, the electrons leave the atom entirely, so that it becomes ionized. The Balmer lines are produced only by hydrogen atoms whose electrons are in the second energy level. If the surface of a star is as cool as the surface of the Sun (about 5800 K) ...
... the gas is hot enough, the electrons leave the atom entirely, so that it becomes ionized. The Balmer lines are produced only by hydrogen atoms whose electrons are in the second energy level. If the surface of a star is as cool as the surface of the Sun (about 5800 K) ...
May 2017 Astronomy Calendar by Dave Mitsky
... 6/8 The Moon is at apogee, subtending 29' 24" from a distance of 406,400 kilometers (252,526 miles), at 6:21 p.m. 6/9 Comet 138P/Shoemaker-Levy is at opposition at 3.698 A.U. 6/9 Neptune Trojan 2013 KY18 is at opposition at 29.186 A.U. 6/9 Johann Gottfied Galle's 205th birthday (1812). 6/9 A double ...
... 6/8 The Moon is at apogee, subtending 29' 24" from a distance of 406,400 kilometers (252,526 miles), at 6:21 p.m. 6/9 Comet 138P/Shoemaker-Levy is at opposition at 3.698 A.U. 6/9 Neptune Trojan 2013 KY18 is at opposition at 29.186 A.U. 6/9 Johann Gottfied Galle's 205th birthday (1812). 6/9 A double ...
ASTRONOMY 120
... has a 1010 year main-sequence lifetime. How does this compare with the energy released by a supernova? (4 points) We can find the total energy output of the Sun over its lifetime by multiplying the Sun’s luminosity (energy output per second) by the number of seconds in the Sun’s 10 billion year life ...
... has a 1010 year main-sequence lifetime. How does this compare with the energy released by a supernova? (4 points) We can find the total energy output of the Sun over its lifetime by multiplying the Sun’s luminosity (energy output per second) by the number of seconds in the Sun’s 10 billion year life ...
Lecture 6: Multiple stars
... A typical cluster has 102 – 104 stars pc3 (compared to <1 for the field) meaning that encounters are at least 102 – 104 more frequent as the collision time goes as (see also later, r is the radius of a star or stellar system): or stellar system ...
... A typical cluster has 102 – 104 stars pc3 (compared to <1 for the field) meaning that encounters are at least 102 – 104 more frequent as the collision time goes as (see also later, r is the radius of a star or stellar system): or stellar system ...
22/06/2016 - Daphne`s Daily Quiz
... 15. How is port, aged for many years in a cask, rather than the bottle, known? 16. Which German composer wrote, "Kol Nidre", for cello and orchestra? 17. Where did the Royal Navy destroy the Franco Spanish fleet, in 1797? 18. Who first mixed space and time, to come up with four dimensional space-tim ...
... 15. How is port, aged for many years in a cask, rather than the bottle, known? 16. Which German composer wrote, "Kol Nidre", for cello and orchestra? 17. Where did the Royal Navy destroy the Franco Spanish fleet, in 1797? 18. Who first mixed space and time, to come up with four dimensional space-tim ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.