Death - Wayne State University Physics and Astronomy
... • They are now known to be caused by old, dead stars • The spectra of a nova shows blue-shifted absorption lines showing that a hot dense gas is expanding towards us at a few thousands of kilometers per second • The continuum is from the hot dense gas and the absorption lines are from the lowerdensi ...
... • They are now known to be caused by old, dead stars • The spectra of a nova shows blue-shifted absorption lines showing that a hot dense gas is expanding towards us at a few thousands of kilometers per second • The continuum is from the hot dense gas and the absorption lines are from the lowerdensi ...
Multi-Object Spectroscopy: Science Applications
... clusters and in the field 2. Use the field sample from same survey to measure (M/L)crit = rcrit/j, where j is the luminosity density of the Universe 3. This calculation yields Wm~0.3; the most convincing evidence for low Wm at the time. ...
... clusters and in the field 2. Use the field sample from same survey to measure (M/L)crit = rcrit/j, where j is the luminosity density of the Universe 3. This calculation yields Wm~0.3; the most convincing evidence for low Wm at the time. ...
Variable Stars – II. Pulsating stars
... and the opacity actually decreases (it scales approximately as κ = ρ/T 3.5 – Kramers Law), so for a given shell of material, more energy is lost at the upper level than is received at the lower. This radiative damping very quickly damps out the pulsation Now consider what happens in a partial ioniza ...
... and the opacity actually decreases (it scales approximately as κ = ρ/T 3.5 – Kramers Law), so for a given shell of material, more energy is lost at the upper level than is received at the lower. This radiative damping very quickly damps out the pulsation Now consider what happens in a partial ioniza ...
Properties of Stars - Montana State University Extended University
... In order to better understand how stars are constructed, astronomers look for correlations between stellar properties. The easiest way to do this is make a plot of one intrinsic property vs. another intrinsic property. An intrinsic property is one that does not depend on the distance the star is fro ...
... In order to better understand how stars are constructed, astronomers look for correlations between stellar properties. The easiest way to do this is make a plot of one intrinsic property vs. another intrinsic property. An intrinsic property is one that does not depend on the distance the star is fro ...
A double detached shell around a post
... the gas-to-dust mass ratio, this leads to a total gas mass of 4 M in the ejecta and an average mass-loss rate of 10−4 M yr−1 and 2−3 × 10−3 M yr−1 associated with the formation of the inner and outer shells, respectively. Some dust is present in the intershell, and the presence of hot dust (∼1500 ...
... the gas-to-dust mass ratio, this leads to a total gas mass of 4 M in the ejecta and an average mass-loss rate of 10−4 M yr−1 and 2−3 × 10−3 M yr−1 associated with the formation of the inner and outer shells, respectively. Some dust is present in the intershell, and the presence of hot dust (∼1500 ...
Critical Content/Concept Web
... 12. High mass stars produce supernovae, neutron stars and black holes 13. Low mass stars produce white dwarfs, and planetary nebulae 14. Parallax, Cepheid’s and standard candles are methods used to measure distance in space ...
... 12. High mass stars produce supernovae, neutron stars and black holes 13. Low mass stars produce white dwarfs, and planetary nebulae 14. Parallax, Cepheid’s and standard candles are methods used to measure distance in space ...
margarita2007
... one • Surviving satellites are predominantly low-mass systems and have been accreted recently • The building blocks of the stellar halo were on average more massive and were accreted (and disrupted) earlier than de population of satellites that survive until the present • These results may help to e ...
... one • Surviving satellites are predominantly low-mass systems and have been accreted recently • The building blocks of the stellar halo were on average more massive and were accreted (and disrupted) earlier than de population of satellites that survive until the present • These results may help to e ...
Chapter 15 THE MILKY WAY IN RELATION TO OTHER GALAXIES
... Surface photometry of such nearby galaxies, which consequently have a large angular size is difficult. Although studies on photographic plates are available from the earliest days of photometry (de Vaucouleurs (1957) observed the LMC very early on in his studies and determined the exponential nature ...
... Surface photometry of such nearby galaxies, which consequently have a large angular size is difficult. Although studies on photographic plates are available from the earliest days of photometry (de Vaucouleurs (1957) observed the LMC very early on in his studies and determined the exponential nature ...
universe new
... After a really massive red giant collapses in a supernova explosion, it leaves an object so dense that nothing, not even light, can escape its gravitational pull. This is called a black hole. Some scientists believe that there are black holes at the centre of galaxies. If light cannot escape from a ...
... After a really massive red giant collapses in a supernova explosion, it leaves an object so dense that nothing, not even light, can escape its gravitational pull. This is called a black hole. Some scientists believe that there are black holes at the centre of galaxies. If light cannot escape from a ...
17. The Universe
... After a really massive red giant collapses in a supernova explosion, it leaves an object so dense that nothing, not even light, can escape its gravitational pull. This is called a black hole. Some scientists believe that there are black holes at the centre of galaxies. If light cannot escape from a ...
... After a really massive red giant collapses in a supernova explosion, it leaves an object so dense that nothing, not even light, can escape its gravitational pull. This is called a black hole. Some scientists believe that there are black holes at the centre of galaxies. If light cannot escape from a ...
MESSIER - EarthLink
... His first own deep sky discovery of globular cluster M3, cataloged on May 3, probably causes him to undertake a systematical search for nebulous objects, leading to the observation and recording of the objects M3-M40, many of which were own discoveries, but several from old catalogs. Messier was mad ...
... His first own deep sky discovery of globular cluster M3, cataloged on May 3, probably causes him to undertake a systematical search for nebulous objects, leading to the observation and recording of the objects M3-M40, many of which were own discoveries, but several from old catalogs. Messier was mad ...
here. - SUNY Oswego
... observations. With an appropriate reddening/extinction error to make the PL linear, LMC Cepheids get hotter at maximum light as the period increases. But Galactic Cepheids have a flat PC relation at maximum light. Preliminary indications are that the Cepheid PL relation in the inner field of NGC 425 ...
... observations. With an appropriate reddening/extinction error to make the PL linear, LMC Cepheids get hotter at maximum light as the period increases. But Galactic Cepheids have a flat PC relation at maximum light. Preliminary indications are that the Cepheid PL relation in the inner field of NGC 425 ...
Lecture 16
... First identified as bright radio sources - without visible counterparts In 1962 Maarten Schmidt identified a “star” coincident with the radio source and obtained a spectrum. He discovered it was not a star, and named it a QUASAR. ...
... First identified as bright radio sources - without visible counterparts In 1962 Maarten Schmidt identified a “star” coincident with the radio source and obtained a spectrum. He discovered it was not a star, and named it a QUASAR. ...
MEASURING ANGLES
... Go outside and look at the night sky and try to find the constellations below (look towards the Southwest, all the way up to the Zenith). You’ll see Deneb and Vega above you (Vega in you Zenith), and Altair a little further South. These are the three brightest stars in the summer sky and are often r ...
... Go outside and look at the night sky and try to find the constellations below (look towards the Southwest, all the way up to the Zenith). You’ll see Deneb and Vega above you (Vega in you Zenith), and Altair a little further South. These are the three brightest stars in the summer sky and are often r ...
Astronomy Chapter 16 – The Milky Way Galaxy A. Main Ideas 1
... ⇒ Interstellar gas is the material from which stars form, and it is the repository (storage place) of matter blown off dying stars 5. Motion of Stars and Gas in the Milky Way Although all stars within the Milky Way move around its center, the paths followed by stars in the disk and halo are very dif ...
... ⇒ Interstellar gas is the material from which stars form, and it is the repository (storage place) of matter blown off dying stars 5. Motion of Stars and Gas in the Milky Way Although all stars within the Milky Way move around its center, the paths followed by stars in the disk and halo are very dif ...
NASA`s Spitzer Images Out-of-This
... Technology in Pasadena. "Some theories hold that the black hole might quiet down and eventually enter a more dormant state like our Milky Way black hole." The ring around the black hole is bursting with new star formation. An inflow of material toward the central bar of the galaxy is causing the rin ...
... Technology in Pasadena. "Some theories hold that the black hole might quiet down and eventually enter a more dormant state like our Milky Way black hole." The ring around the black hole is bursting with new star formation. An inflow of material toward the central bar of the galaxy is causing the rin ...
the discovery of a massive cluster of red supergiants with glimpse
... aspects of star formation and Galactic structure. The GLIMPSE mid-IR survey and many complementary surveys such as MIPSGAL (Carey et al. 2005) at 24 μm, Two Micron All Sky Survey (2MASS; Skrutskie et al. 2006), and the Boston University Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ri ...
... aspects of star formation and Galactic structure. The GLIMPSE mid-IR survey and many complementary surveys such as MIPSGAL (Carey et al. 2005) at 24 μm, Two Micron All Sky Survey (2MASS; Skrutskie et al. 2006), and the Boston University Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ri ...
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 ...
GALEX UV Light-curves of M-Dwarf Flare Stars: THE FLARING UV
... - a rapid rise in flux followed by a gradual decay - a rapid rise in flux followed by further, sometimes larger, eruptions with long decay times ...
... - a rapid rise in flux followed by a gradual decay - a rapid rise in flux followed by further, sometimes larger, eruptions with long decay times ...
Measuring Black Hole Masses in Nearby Galaxies with Laser Guide
... Outline • Background on black hole mass measurements • Examples of what’s been done with AO to date • Our own work, measuring black hole masses in NGC 6240, a collision between two disk galaxies • Summary ...
... Outline • Background on black hole mass measurements • Examples of what’s been done with AO to date • Our own work, measuring black hole masses in NGC 6240, a collision between two disk galaxies • Summary ...
How is Light Made?
... enough to circle around the earth 7.5 times in 1 second. Its properties demonstrate both wave-like nature (like interference) and particle-like nature (like photo-electric effect.) ...
... enough to circle around the earth 7.5 times in 1 second. Its properties demonstrate both wave-like nature (like interference) and particle-like nature (like photo-electric effect.) ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.