The coronal temperatures of low-mass main
... mass-independent value of RX . It would further imply that all saturated stars have similar coronal temperatures. On the other hand, if either LX or FX are the relevant parameters, then it would indicate that among stars that lie above the saturation threshold, lower mass stars have cooler coronae t ...
... mass-independent value of RX . It would further imply that all saturated stars have similar coronal temperatures. On the other hand, if either LX or FX are the relevant parameters, then it would indicate that among stars that lie above the saturation threshold, lower mass stars have cooler coronae t ...
Building` a Galaxy SED
... Practical problem: galaxies are biased tracers of underlying mass distribution. In order to use galaxies to measure underlying mass distribution, we must understand galaxies. ...
... Practical problem: galaxies are biased tracers of underlying mass distribution. In order to use galaxies to measure underlying mass distribution, we must understand galaxies. ...
Downloadable Full Text
... The elements heavier than zinc are synthesized through the (r)apid and (s)low neutroncapture processes1,2. The primary astrophysical production site of the r-process elements (such as europium) has been debated for nearly 60 years2. Chemical abundance trends of old Galactic halo stars initially sugg ...
... The elements heavier than zinc are synthesized through the (r)apid and (s)low neutroncapture processes1,2. The primary astrophysical production site of the r-process elements (such as europium) has been debated for nearly 60 years2. Chemical abundance trends of old Galactic halo stars initially sugg ...
The evolution of spiral galaxies in clusters Kutdemir, Elif
... the accretion process. Recently an isolated polar disk galaxy was found (Stanonik et al. 2009). The extended HI polar disk has comparable mass with the stellar disk and it has no optical counterpart suggesting cold gas accretion as the most likely formation mechanism. Mergers have been observed in t ...
... the accretion process. Recently an isolated polar disk galaxy was found (Stanonik et al. 2009). The extended HI polar disk has comparable mass with the stellar disk and it has no optical counterpart suggesting cold gas accretion as the most likely formation mechanism. Mergers have been observed in t ...
Full description (Word document) - International Occultation Timing
... 700 alt-az telescope and will soon be applied to their CDK 1000 (1 meter) telescope. The Sidereal Technology direct drive controller will be available shortly to all those who which to build their own direct drive telescopes, as will meter class sandwich mirrors from Hubble Optics. The Alt-Az Initia ...
... 700 alt-az telescope and will soon be applied to their CDK 1000 (1 meter) telescope. The Sidereal Technology direct drive controller will be available shortly to all those who which to build their own direct drive telescopes, as will meter class sandwich mirrors from Hubble Optics. The Alt-Az Initia ...
Project Description - SDSS-III
... ratio ∼1:6, flat space, and primordial fluctuations with the statistical properties predicted by inflation. This model requires one very surprising ingredient, “dark energy,” which drives accelerating expansion of the Universe. Large-scale imaging and spectroscopic surveys have revealed rich, comple ...
... ratio ∼1:6, flat space, and primordial fluctuations with the statistical properties predicted by inflation. This model requires one very surprising ingredient, “dark energy,” which drives accelerating expansion of the Universe. Large-scale imaging and spectroscopic surveys have revealed rich, comple ...
PH607lec12
... Hubble found H0 ~ 500 km/s/Mpc !! Hubble had confused two different kinds of Cepheid variable stars used for calibrating distances and also that what Hubble thought were bright stars in distant galaxies were actually H II regions. Throughout the 20th century we found evidence for H in the range 50 - ...
... Hubble found H0 ~ 500 km/s/Mpc !! Hubble had confused two different kinds of Cepheid variable stars used for calibrating distances and also that what Hubble thought were bright stars in distant galaxies were actually H II regions. Throughout the 20th century we found evidence for H in the range 50 - ...
The Formation and Evolution of Massive Black Holes - Ira-Inaf
... produce a very massive star of up to a few thousand M⊙ before the first supernovae explode. When heavy elements are still rare, just about when the second generation of stars occurs, the final fate of a very massive star is to collapse into a black hole with a mass similar to that of its progenitor. ...
... produce a very massive star of up to a few thousand M⊙ before the first supernovae explode. When heavy elements are still rare, just about when the second generation of stars occurs, the final fate of a very massive star is to collapse into a black hole with a mass similar to that of its progenitor. ...
Next Generation Sunshine State Standards Chapter 24
... kilometers (62,000 miles) away! That is one long sheet of paper! It would wrap around Earth two and one half times. Also on this scale, the nearest galaxy lies 60 billion kilometers away. These facts suggest that the universe is incomprehensibly large. It is also incomprehensibly empty, containing o ...
... kilometers (62,000 miles) away! That is one long sheet of paper! It would wrap around Earth two and one half times. Also on this scale, the nearest galaxy lies 60 billion kilometers away. These facts suggest that the universe is incomprehensibly large. It is also incomprehensibly empty, containing o ...
Document
... which they formed, resulting in the emission of much infrared radiation, the current rate of star formation in a galaxy can be estimated by measuring its infrared power. Space telescopes such as the Infrared Astronomical Satellite (IRAS, in the mid-1980s) and the Infrared Space Observatory (ISO, in ...
... which they formed, resulting in the emission of much infrared radiation, the current rate of star formation in a galaxy can be estimated by measuring its infrared power. Space telescopes such as the Infrared Astronomical Satellite (IRAS, in the mid-1980s) and the Infrared Space Observatory (ISO, in ...
Starburst Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org T Heckman
... Perhaps the most commonly used technique to estimate t is to calculate the gas-depletion time: the mass of interstellar gas in the starburst divided by the present rate of star formation. This is then a rough estimate of how much longer the starburst can be sustained before running out of gas. Gas- ...
... Perhaps the most commonly used technique to estimate t is to calculate the gas-depletion time: the mass of interstellar gas in the starburst divided by the present rate of star formation. This is then a rough estimate of how much longer the starburst can be sustained before running out of gas. Gas- ...
SIMsim: An End-to-End Simulation of The Space Interferometer
... Figure 1. Schematic diagram of an optical interferometer with feed-forward Figure 1 shows a schematic of a standard optical interferometer. A position of the target star that is not exactly perpendicular to the baseline will generate a geometric delay between the two telescopes of the interferometer ...
... Figure 1. Schematic diagram of an optical interferometer with feed-forward Figure 1 shows a schematic of a standard optical interferometer. A position of the target star that is not exactly perpendicular to the baseline will generate a geometric delay between the two telescopes of the interferometer ...
talk
... Dwarfs fainter than MB ~ -14.0 have chaotic velocity fields ??? (e.g. Cote et al. 2000 AJ 120 3027, Lo et al. 1993 AJ 106 507) ...
... Dwarfs fainter than MB ~ -14.0 have chaotic velocity fields ??? (e.g. Cote et al. 2000 AJ 120 3027, Lo et al. 1993 AJ 106 507) ...
PDF
... For normal mass MACHOs, rE >> Rstar, but for mPBH in the PBH DM window (10-‐12 < mPBH < 10-‐7 Solar mass), rE < Rstar, so the effective tube radius becomes the projected radius of the st ...
... For normal mass MACHOs, rE >> Rstar, but for mPBH in the PBH DM window (10-‐12 < mPBH < 10-‐7 Solar mass), rE < Rstar, so the effective tube radius becomes the projected radius of the st ...
Sample pages 1 PDF
... we already discussed in the context of galaxies and galaxy clusters. Recent observational results have shown that the mean density of dark matter dominates over that of baryonic matter also on cosmic scales. Even more surprising than the existence of dark matter is the discovery that about 70 % of t ...
... we already discussed in the context of galaxies and galaxy clusters. Recent observational results have shown that the mean density of dark matter dominates over that of baryonic matter also on cosmic scales. Even more surprising than the existence of dark matter is the discovery that about 70 % of t ...
Stellar astrophysics based on interferometry
... Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the same lines of VLT instruments, in particular for what concerns standards, operation, data management. Both instruments represent first-timers in their areas. ESO a ...
... Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the same lines of VLT instruments, in particular for what concerns standards, operation, data management. Both instruments represent first-timers in their areas. ESO a ...
TOPS: Toward Other Planetary
... history, the mechanisms of its development, and the relationship between the formation of our Sun and its associated planets. Astronomical observations are providing important new information about the processes that give birth to stars and about the conditions in star-forming regions and around ver ...
... history, the mechanisms of its development, and the relationship between the formation of our Sun and its associated planets. Astronomical observations are providing important new information about the processes that give birth to stars and about the conditions in star-forming regions and around ver ...
mufon ufo symposium -1974
... F5V to F7V have more stars rotating slowly indicating the possibility of planets. From approximately F8 on, all main sequence stars are rotating slowly, probably indicating planets. According to Carl Sagan, F8 is the point where intelligent life would have time to emerge. So main sequence stars fro ...
... F5V to F7V have more stars rotating slowly indicating the possibility of planets. From approximately F8 on, all main sequence stars are rotating slowly, probably indicating planets. According to Carl Sagan, F8 is the point where intelligent life would have time to emerge. So main sequence stars fro ...
19_Testbank - Lick Observatory
... Answer: A star made of only helium and hydrogen would have to be among the first generation of stars ever born, arising out of the primordial mix of elements that came from the Big Bang. The oldest stars we know about are over 12-15 billion years old—a star made of only helium and hydrogen would hav ...
... Answer: A star made of only helium and hydrogen would have to be among the first generation of stars ever born, arising out of the primordial mix of elements that came from the Big Bang. The oldest stars we know about are over 12-15 billion years old—a star made of only helium and hydrogen would hav ...
Radial Velocity - Yale Exoplanet
... The unknown inclination angle i prevents us from meaIn this equation, v is the velocity of the source relative suring the true mass of the companion m2 . While this is an important limitation of the RV technique for individual to the observer, k is the unit vector pointing from the obsystems, this f ...
... The unknown inclination angle i prevents us from meaIn this equation, v is the velocity of the source relative suring the true mass of the companion m2 . While this is an important limitation of the RV technique for individual to the observer, k is the unit vector pointing from the obsystems, this f ...
GRAVITY: Observing the Universe in Motion
... The VLTI is the largest array of 8-metreclass telescopes that explicitly included interferometry in its design and implementation. No other array is equipped with a comparable infrastructure. The VLTI, with its four 8-metre Unit Telescopes (UTs) and a total collecting area of 200 m2, is the only int ...
... The VLTI is the largest array of 8-metreclass telescopes that explicitly included interferometry in its design and implementation. No other array is equipped with a comparable infrastructure. The VLTI, with its four 8-metre Unit Telescopes (UTs) and a total collecting area of 200 m2, is the only int ...
Determination of kinetic energies of stars using Hipparcos data *
... no systematic increment of its values while moving along the main sequence. The difference in the kinetic energies that remains, can be explained by inaccuracy in mass N 1526 determination or other reasons and needs to studied in 7085 detail. In our opinion, there are two directions, in which the pr ...
... no systematic increment of its values while moving along the main sequence. The difference in the kinetic energies that remains, can be explained by inaccuracy in mass N 1526 determination or other reasons and needs to studied in 7085 detail. In our opinion, there are two directions, in which the pr ...
1 Introduction - University of Amsterdam
... neous. To understand the wealth of CCSNe types – and, broadening the scope, the role of massive stars in our universe – it is pivotal to understand the formation and evolution of massive stars. Perhaps surprisingly so, little is known about these processes. The formation of massive stars – rare even ...
... neous. To understand the wealth of CCSNe types – and, broadening the scope, the role of massive stars in our universe – it is pivotal to understand the formation and evolution of massive stars. Perhaps surprisingly so, little is known about these processes. The formation of massive stars – rare even ...
WIMPs and MACHOs - Caltech Astronomy
... except by exquisitely sensitive equipment. These difficulties, however, have not stopped many groups throughout the world from developing devices capable of detecting WIMPs. The detection rates turn out to be within and just beyond the reach of current experimental efforts. The basic idea is to dete ...
... except by exquisitely sensitive equipment. These difficulties, however, have not stopped many groups throughout the world from developing devices capable of detecting WIMPs. The detection rates turn out to be within and just beyond the reach of current experimental efforts. The basic idea is to dete ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.