Spectral Variations of Several RV Tauri Type Stars Patrick Durant
... Typical periods between successive deep minima are 30 to 150 days. ...
... Typical periods between successive deep minima are 30 to 150 days. ...
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL)
... regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007). As shown by Deharveng et al. (2010), more than 85 % of these 8 µm bubbles enclose H ii regions and con ...
... regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007). As shown by Deharveng et al. (2010), more than 85 % of these 8 µm bubbles enclose H ii regions and con ...
The Triple-Ring Nebula: Fingerprint of a Binary Merger
... for the progenitor8 . In this model, the system consisted initially of two massive stars, one with a mass of 15 – 20 times the mass of the Sun and a less massive companion with a mass of times the mass of the Sun. The two stars were orbiting each other with a period of at least 10 years (i.e. it t ...
... for the progenitor8 . In this model, the system consisted initially of two massive stars, one with a mass of 15 – 20 times the mass of the Sun and a less massive companion with a mass of times the mass of the Sun. The two stars were orbiting each other with a period of at least 10 years (i.e. it t ...
Galaxies
... Hubble Expansion of Universe During 1920‘s and 30‘s Edwin Hubble was Measuring the distances of stars and galaxies and comparing them to the redshift of their spectra. He discovered that the radial speed of the galaxies increased in proportion to their distance. A plot of later data is shown in the ...
... Hubble Expansion of Universe During 1920‘s and 30‘s Edwin Hubble was Measuring the distances of stars and galaxies and comparing them to the redshift of their spectra. He discovered that the radial speed of the galaxies increased in proportion to their distance. A plot of later data is shown in the ...
astro704_final - Department of Physics and Astronomy
... of baryonic haloes and disks are constant in time, until a merger occurs • But...we observe galaxies, especially dwarfs like the Magellanic clouds, whose cores are less centrally concentrated than would be predicted by this model, or by NFW CDM halo profiles. • Reference model does not include disk ...
... of baryonic haloes and disks are constant in time, until a merger occurs • But...we observe galaxies, especially dwarfs like the Magellanic clouds, whose cores are less centrally concentrated than would be predicted by this model, or by NFW CDM halo profiles. • Reference model does not include disk ...
The Properties of Stars
... stars can have the same luminosity and very different apparent magnitudes. Alpha Centauri A and the Sun, for example, are both spectral class G2 stars and have about the same luminosity L = 3.86×1026 W. On the other hand, the apparent magnitude of Alpha Centauri A is 0.1 and the apparent magnitude o ...
... stars can have the same luminosity and very different apparent magnitudes. Alpha Centauri A and the Sun, for example, are both spectral class G2 stars and have about the same luminosity L = 3.86×1026 W. On the other hand, the apparent magnitude of Alpha Centauri A is 0.1 and the apparent magnitude o ...
Chapter 10 powerpoint presentation
... Although the temperatures in the Sun’s core are high, they are not high enough to overcome the coulomb repulsion force resulting from two positively charged nuclei colliding under the laws of classical physics. The solution to this problem is quantum mechanical tunneling. ...
... Although the temperatures in the Sun’s core are high, they are not high enough to overcome the coulomb repulsion force resulting from two positively charged nuclei colliding under the laws of classical physics. The solution to this problem is quantum mechanical tunneling. ...
Lectures 6-8: Solar nebula theory
... o If critical size is achieved, a planetesimal will grow rapidly. Less massive objects grow at a much smaller rate. o Model calculation suggest that the first large size objects to form are planetesimals with sizes ~ few tens of km. ...
... o If critical size is achieved, a planetesimal will grow rapidly. Less massive objects grow at a much smaller rate. o Model calculation suggest that the first large size objects to form are planetesimals with sizes ~ few tens of km. ...
Assignment 4 Solutions
... states of stars which have come to the end of their evolutionary cycles. Specifically, at the end of the “red giant” stage, when fusion of carbon into iron begins to dominate in the core, all stars commence their final “collapse”. It is at this point that the differences between these end states wil ...
... states of stars which have come to the end of their evolutionary cycles. Specifically, at the end of the “red giant” stage, when fusion of carbon into iron begins to dominate in the core, all stars commence their final “collapse”. It is at this point that the differences between these end states wil ...
here - Stars `r` Us!
... 10% or so of matter in the universe is the familiar “baryonic” material, mostly locked in stars. Only about 1% of all matter is gaseous and distributed between the stars. And of this 1%, perhaps half is molecular. Therefore only about 0.5% of the total mass of the universe is composed of molecules. ...
... 10% or so of matter in the universe is the familiar “baryonic” material, mostly locked in stars. Only about 1% of all matter is gaseous and distributed between the stars. And of this 1%, perhaps half is molecular. Therefore only about 0.5% of the total mass of the universe is composed of molecules. ...
Today`s Powerpoint
... Clusters are crucial for stellar evolution studies because: 1) All stars in a cluster formed at about same time (so all have same age) 2) All stars are at about the same distance 3) All stars have same chemical composition ...
... Clusters are crucial for stellar evolution studies because: 1) All stars in a cluster formed at about same time (so all have same age) 2) All stars are at about the same distance 3) All stars have same chemical composition ...
ASTR2050 Spring 2005 •
... Globular clusters are nearly pure H and He (no “metals”) and stellar evolution details are sensitive to composition. Galactic clusters are more typical of stars in the galactic disk, including “metals”. We call these Population I stars. Low metallicity stars, like those found in globular clusters, a ...
... Globular clusters are nearly pure H and He (no “metals”) and stellar evolution details are sensitive to composition. Galactic clusters are more typical of stars in the galactic disk, including “metals”. We call these Population I stars. Low metallicity stars, like those found in globular clusters, a ...
CoRoT Observations of O Stars: Diverse Origins of Variability
... 2.3. HD 46966 (O8 V) Blomme et al. (2011) applied classical pre-whitening to the periodogram of HD 46966. About 300 frequencies are required before the noise level is reached. Significance tests show that all 300 frequencies are significant. It is, however, highly suspicious that so many pulsation f ...
... 2.3. HD 46966 (O8 V) Blomme et al. (2011) applied classical pre-whitening to the periodogram of HD 46966. About 300 frequencies are required before the noise level is reached. Significance tests show that all 300 frequencies are significant. It is, however, highly suspicious that so many pulsation f ...
HEIC0410: FOR RELEASE 15:00 (CEST)/9:00 AM EDT 15 June
... Both components of the binary system belong to the L spectral class that includes the lowest mass stars and the highest mass brown dwarfs in our solar neighbourhood. This spectral class was discovered in 1997 and was added to the spectral classification that had remained unchanged for half a century ...
... Both components of the binary system belong to the L spectral class that includes the lowest mass stars and the highest mass brown dwarfs in our solar neighbourhood. This spectral class was discovered in 1997 and was added to the spectral classification that had remained unchanged for half a century ...
Sky News – March 2015 The Realm of the Galaxies
... galaxies are outlying members. Here galaxies are so numerous that they seem to outnumber the visible stars. Estimates of the total number are between 1,200 and 2,000 and the average distance is 53 million light years (a light year is about 10 trillion kilometres). As with virtually all clusters of g ...
... galaxies are outlying members. Here galaxies are so numerous that they seem to outnumber the visible stars. Estimates of the total number are between 1,200 and 2,000 and the average distance is 53 million light years (a light year is about 10 trillion kilometres). As with virtually all clusters of g ...
Export To Word
... from the basics of science and observation through the solar system, stars, cosmology, and telephotography. The material is clearly organized by topic using links to reference materials on the web. Images recently discovered by the Herschel telescope reveal the formation of previously unseen high-ma ...
... from the basics of science and observation through the solar system, stars, cosmology, and telephotography. The material is clearly organized by topic using links to reference materials on the web. Images recently discovered by the Herschel telescope reveal the formation of previously unseen high-ma ...
High-mass stars in the Galactic center Quintuplet cluster
... (2003, Geneva tracks). The tracks were calculated for solar metallicity and different initial masses. It can clearly be seen, that the tracks with rotation don’t reach into the cool domain the stars are located in and that only the very high-mass tracks ≥ 60 M initial stellar mass can be considered ...
... (2003, Geneva tracks). The tracks were calculated for solar metallicity and different initial masses. It can clearly be seen, that the tracks with rotation don’t reach into the cool domain the stars are located in and that only the very high-mass tracks ≥ 60 M initial stellar mass can be considered ...
Lecture 13: The Stars –
... • Main Sequence stars range from 0.1M to ~100M • The masses of Main Sequence stars increase with increasing luminosity, size and temperature • Main Sequence stars increase in mass from the lower right to the upper left of the H-R Diagram ...
... • Main Sequence stars range from 0.1M to ~100M • The masses of Main Sequence stars increase with increasing luminosity, size and temperature • Main Sequence stars increase in mass from the lower right to the upper left of the H-R Diagram ...
Foundations III The Stars
... a range of sizes from the small found in the lower right to the large found in the upper left • The largest stars are the Giant and Supergiant stars which are found in the upper right corner ...
... a range of sizes from the small found in the lower right to the large found in the upper left • The largest stars are the Giant and Supergiant stars which are found in the upper right corner ...
Sample Midterm - IUPUI Physics
... apparent magnitude vs. their B-V magnitude what will you get? a) A nice neat plot with a clear main sequence and clear red giant branch b) A nice neat plot with a clear main sequence but a few red giant branches c) A plot with a clear main sequence but an unclear red giant branch d) A complete scatt ...
... apparent magnitude vs. their B-V magnitude what will you get? a) A nice neat plot with a clear main sequence and clear red giant branch b) A nice neat plot with a clear main sequence but a few red giant branches c) A plot with a clear main sequence but an unclear red giant branch d) A complete scatt ...
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.