lecture2 - X-Ray
... Accretion in close binaries Accretion is the most powerful source of energy realized in Nature, which can give a huge energy output. When matter fall down onto the surface of a neutron star up to 10% of mc2 can be released. ...
... Accretion in close binaries Accretion is the most powerful source of energy realized in Nature, which can give a huge energy output. When matter fall down onto the surface of a neutron star up to 10% of mc2 can be released. ...
steady flow
... • 1920 Aston measures mass defect of helium (!= 4p’s) • 1920 Nuclear Astrophysics is born with Sir Arthur Eddington remarks in his presidential address to the British Association for the Advancement of Science: “Certain physical investigations in the past year make it probable to my mind that some p ...
... • 1920 Aston measures mass defect of helium (!= 4p’s) • 1920 Nuclear Astrophysics is born with Sir Arthur Eddington remarks in his presidential address to the British Association for the Advancement of Science: “Certain physical investigations in the past year make it probable to my mind that some p ...
X-ray Emission Line Profile Diagnostics of Hot Star Winds
... We do expect some wavelength dependence of the cross sections (and thus of the wind optical depth), BUT the lines we fit cover only a modest range of wavelengths. And in the case of z Pup, nitrogen overabundance (not in calculation shown at right) could flatten out the ...
... We do expect some wavelength dependence of the cross sections (and thus of the wind optical depth), BUT the lines we fit cover only a modest range of wavelengths. And in the case of z Pup, nitrogen overabundance (not in calculation shown at right) could flatten out the ...
NearInfrared
... We observe our science target as well as the stars, appear in positive (white) and negative (black). As a result of this operation the sky emission is now nearly zero. Step 4: We can perform photometry on the target and measure the total counts per second, by identifying the area of interest. This c ...
... We observe our science target as well as the stars, appear in positive (white) and negative (black). As a result of this operation the sky emission is now nearly zero. Step 4: We can perform photometry on the target and measure the total counts per second, by identifying the area of interest. This c ...
Double Stars Discovered by IOTA Predicted Occultations July, 2010
... with the predicted magnitude drop and because the single event measured magnitude drops agreed with the single occultation of a double star, the combination of all the chords precluded a double asteroid. ...
... with the predicted magnitude drop and because the single event measured magnitude drops agreed with the single occultation of a double star, the combination of all the chords precluded a double asteroid. ...
SSG Coordinators will be at the Cronan Ranch observing site at 6
... 4200 light years away. This is a much larger (15 minutes of arc) and older cluster than M36 but the density of the cluster is much lower. Messier 37 is our third open cluster, and this is my personal favorite. To find it, jump across that imaginary line between Beta and Theta Aurigae to a spot about ...
... 4200 light years away. This is a much larger (15 minutes of arc) and older cluster than M36 but the density of the cluster is much lower. Messier 37 is our third open cluster, and this is my personal favorite. To find it, jump across that imaginary line between Beta and Theta Aurigae to a spot about ...
9 Measuring the properties of stars - Journigan-wiki
... Looking at the H-R diagram brings several questions to mind. How can stars of different temperature have the same magnitude? Conversely, how can stars with the same temperatures have different magnitudes? The answer lies in the Stephan-Boltzmann ...
... Looking at the H-R diagram brings several questions to mind. How can stars of different temperature have the same magnitude? Conversely, how can stars with the same temperatures have different magnitudes? The answer lies in the Stephan-Boltzmann ...
Clusters - El Camino College
... Purpose: The purpose of this lab is to learn how to find faint objects not visible to the naked eye and sometimes not visible in the finder telescope. You will also develop an understanding and appreciation of the two primary types of clusters, and how they lead to an understanding of star formation ...
... Purpose: The purpose of this lab is to learn how to find faint objects not visible to the naked eye and sometimes not visible in the finder telescope. You will also develop an understanding and appreciation of the two primary types of clusters, and how they lead to an understanding of star formation ...
1” “Sky-Notes” of the Open University Astronomy Club. June 2005. A
... NGC6205 (M13) (5.9) gc. Arguably one of the outstanding objects in the northern hemisphere. Just visible to the naked eye from dark sites it appears as a fuzzy blob in binoculars. It stands high power well and the outer edges begin to resolve into individual stars in a 4" (100mm) telescope. Increasi ...
... NGC6205 (M13) (5.9) gc. Arguably one of the outstanding objects in the northern hemisphere. Just visible to the naked eye from dark sites it appears as a fuzzy blob in binoculars. It stands high power well and the outer edges begin to resolve into individual stars in a 4" (100mm) telescope. Increasi ...
chapter15SurveyStars..
... • What is a Hertzsprung-Russell diagram? – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type) ...
... • What is a Hertzsprung-Russell diagram? – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type) ...
tutorial1_2014
... Go to NED, the NASA/IPAC Extragalactic Database (http://ned.ipac.caltech.edu/) and find the coordinates of 3 galaxies, one far from the Galactic Plane, i.e. M87, the central galaxy of the Virgo cluster; , one deep in the extinction layer of the Milky Way, i.e. HIPASS J0836-43, the most HImassive gal ...
... Go to NED, the NASA/IPAC Extragalactic Database (http://ned.ipac.caltech.edu/) and find the coordinates of 3 galaxies, one far from the Galactic Plane, i.e. M87, the central galaxy of the Virgo cluster; , one deep in the extinction layer of the Milky Way, i.e. HIPASS J0836-43, the most HImassive gal ...
Two-Gyro Performance, Scheduling and Acquisitions
... – This problem was identified by the OTA SEs in some follow-on analysis of the previous problem’s test results. However, the cause of this problem is different. – Problem only occurs with Target-ReAcq style Acqs/ReAcqs where both PASS and the onboard ReAcq process are effectively accounting for a po ...
... – This problem was identified by the OTA SEs in some follow-on analysis of the previous problem’s test results. However, the cause of this problem is different. – Problem only occurs with Target-ReAcq style Acqs/ReAcqs where both PASS and the onboard ReAcq process are effectively accounting for a po ...
Shedding Light on Relativity - DCC
... outer regions of star As bright as an entire galaxy for a few days ...
... outer regions of star As bright as an entire galaxy for a few days ...
New Astrophysical Opportunities Exploiting Spatio-Temporal Optical Correlations
... nuclear activity. The VLTI has succeeded in resolving structures in the AGN torus at midinfrared wavelengths [23] on scales of 30 milli-arcsecond. On the other hand, the blue optical continuum emission is dominated by thermal emission from the inner accretion disk (the source of the “big blue bump” ...
... nuclear activity. The VLTI has succeeded in resolving structures in the AGN torus at midinfrared wavelengths [23] on scales of 30 milli-arcsecond. On the other hand, the blue optical continuum emission is dominated by thermal emission from the inner accretion disk (the source of the “big blue bump” ...
Introduction - Cambridge University Press
... The starting point for the formation of a star is a cloud of cold gas, composed primarily of hydrogen and helium, with traces of heavier elements (usually referred to as metals). The cloud collapses due to its own gravity, and as gravitational potential energy is released and converted into heat, th ...
... The starting point for the formation of a star is a cloud of cold gas, composed primarily of hydrogen and helium, with traces of heavier elements (usually referred to as metals). The cloud collapses due to its own gravity, and as gravitational potential energy is released and converted into heat, th ...
The Milky Way Galaxy (ch. 23)
... These population characteristics suggest a consistent picture for the formation and evolution of our galaxy (Fig.23.14)—halo forms first in nearly spherical shape, rest of gas collapsed to disk which has formed stars continuously since that time. (Think about how above properties suggest this.) Mor ...
... These population characteristics suggest a consistent picture for the formation and evolution of our galaxy (Fig.23.14)—halo forms first in nearly spherical shape, rest of gas collapsed to disk which has formed stars continuously since that time. (Think about how above properties suggest this.) Mor ...
Stellar Evolu1on Stars spend most of their lives on the main
... observable from Earth are main-‐sequence stars. Stellar evolu,on during the main-‐sequence life-‐,me, and during the post-‐main-‐sequence phase, is driven by the conversion of hydrogen into helium in their ...
... observable from Earth are main-‐sequence stars. Stellar evolu,on during the main-‐sequence life-‐,me, and during the post-‐main-‐sequence phase, is driven by the conversion of hydrogen into helium in their ...
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.