UK Exoplanet community meeting 2017
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
THREE INTRIGUER NEBULAE IN CONSTELLATION CARINA
... carry out my own project to study this entity in detail using a common telescope and, like with other observing projects, have an empirical description of it, thus finding out how many and which members are in the range of an 8-inch telescope, getting conclusions and saving observations for other ob ...
... carry out my own project to study this entity in detail using a common telescope and, like with other observing projects, have an empirical description of it, thus finding out how many and which members are in the range of an 8-inch telescope, getting conclusions and saving observations for other ob ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... We try to model Eri by fitting the four most significant, independent frequencies that are present in both the photometric and spectroscopic data. So far we encounter a puzzle : a non adiabatic analysis of the solutions best fitting the observed frequencies shows that these modes are not excited. We ...
... We try to model Eri by fitting the four most significant, independent frequencies that are present in both the photometric and spectroscopic data. So far we encounter a puzzle : a non adiabatic analysis of the solutions best fitting the observed frequencies shows that these modes are not excited. We ...
Chapter 12: Stars and Galaxies
... When light from a star is passed through a spectroscope, astronomers see dark absorption lines that are produced as light passes through the star’s cooler, less dense atmosphere. Each element contributes its own set of absorption lines to this absorption spectrum, such as those shown in Figure 5. Wh ...
... When light from a star is passed through a spectroscope, astronomers see dark absorption lines that are produced as light passes through the star’s cooler, less dense atmosphere. Each element contributes its own set of absorption lines to this absorption spectrum, such as those shown in Figure 5. Wh ...
Dynamical Mass Measurements of Pre-Main
... groundbased optical and infrared interferometers. Dynamical mass measurements of four stars from two AS systems are presented in Table 1. We anticipate that the summary table in the Protostars and Planets VI review will show a large increase in the number of AS binaries (section 5). The application ...
... groundbased optical and infrared interferometers. Dynamical mass measurements of four stars from two AS systems are presented in Table 1. We anticipate that the summary table in the Protostars and Planets VI review will show a large increase in the number of AS binaries (section 5). The application ...
Unit 13―The “Fixed” Stars
... Until we know more about whether some stars are inherently bigger than others or some stars “burn” by a faster process, we cannot be 100% certain, but a good first guess is the drop in brightness corresponds to increasing distance from the Earth. That makes sense if you imagine that stars have some ...
... Until we know more about whether some stars are inherently bigger than others or some stars “burn” by a faster process, we cannot be 100% certain, but a good first guess is the drop in brightness corresponds to increasing distance from the Earth. That makes sense if you imagine that stars have some ...
IR Universe
... are dustier than they were thought to be. Many of the meteors may be the larger pieces of this comet dust. IRAS discovered 6 new comets including comet IRAS-Araki-Alcock and collected infrared data on 25 previously known comets. Comets are balls of dust, rock and ice left over from the formation ...
... are dustier than they were thought to be. Many of the meteors may be the larger pieces of this comet dust. IRAS discovered 6 new comets including comet IRAS-Araki-Alcock and collected infrared data on 25 previously known comets. Comets are balls of dust, rock and ice left over from the formation ...
MASSIVE CLOSE BINARIES
... Population number synthesis (PNS) of massive stars relies on the evolution of massive stars and, therefore, uncertainties in stellar evolution imply uncertainties in PNS. The mass transfer and the accretion process during Roche lobe overflow (RLOF) in a binary, the merger process and common envelope ...
... Population number synthesis (PNS) of massive stars relies on the evolution of massive stars and, therefore, uncertainties in stellar evolution imply uncertainties in PNS. The mass transfer and the accretion process during Roche lobe overflow (RLOF) in a binary, the merger process and common envelope ...
Precision age indicators that exploit chemically peculiar stars
... blur the results from the more common CP varieties, and, secondly and more positively, some day enable a direct measurement of binary fractions in external galaxies. The calibration of the technique is in its infancy and needs much more work. Spectral libraries should be built with explicit inclusio ...
... blur the results from the more common CP varieties, and, secondly and more positively, some day enable a direct measurement of binary fractions in external galaxies. The calibration of the technique is in its infancy and needs much more work. Spectral libraries should be built with explicit inclusio ...
Starburst Galaxies - Beck-Shop
... (Box 2.2). H II regions are some of the most spectacular sights in the sky – rivalling galaxies – and the well-known Orion Nebula (M 42, Fig. 2.1) is exactly just such a region that has developed on the nearest side to us of the Orion GMC. The young stars, that can now be seen directly, have masses ...
... (Box 2.2). H II regions are some of the most spectacular sights in the sky – rivalling galaxies – and the well-known Orion Nebula (M 42, Fig. 2.1) is exactly just such a region that has developed on the nearest side to us of the Orion GMC. The young stars, that can now be seen directly, have masses ...
Interdisciplinary Evolution of the Hubble Space Telescope
... The US Army has been experimenting with captured V2 rockets, some of which have been equipped with scientific payloads. In 1950, at a dinner party in his home, physicist James Van Allen and several scientists consider the idea for a third International Polar Year – this will become the IGY. An incre ...
... The US Army has been experimenting with captured V2 rockets, some of which have been equipped with scientific payloads. In 1950, at a dinner party in his home, physicist James Van Allen and several scientists consider the idea for a third International Polar Year – this will become the IGY. An incre ...
8 m Club Meeting - Adaptive optics
... Closest ultracool companion around a main sequence star m = 8.6 mag ...
... Closest ultracool companion around a main sequence star m = 8.6 mag ...
Publications 2003 - Département d`Astrophysique, Géophysique et
... Models of Cen A & B have been computed using a new mass determination together with seismological data obtained very recently. These new data do help improve our knowledge of the evolutionary status of the system. All the constraints are satisfied with a model which gives an age of about 6 Gyr for t ...
... Models of Cen A & B have been computed using a new mass determination together with seismological data obtained very recently. These new data do help improve our knowledge of the evolutionary status of the system. All the constraints are satisfied with a model which gives an age of about 6 Gyr for t ...
Habitable Zone Lifetimes of Exoplanets around Main Sequence Stars
... orbits fall within the circumstellar habitable zone of their star. However, the habitable zone (HZ) is not static in time or space, and its boundaries migrate outward at a rate proportional to the increase in luminosity of a star undergoing stellar evolution, possibly including or excluding planets ...
... orbits fall within the circumstellar habitable zone of their star. However, the habitable zone (HZ) is not static in time or space, and its boundaries migrate outward at a rate proportional to the increase in luminosity of a star undergoing stellar evolution, possibly including or excluding planets ...
The Stability of Exomoons in the Habitable Zone
... an atmosphere must be present, and limits are set for what ranges of temperature and pressure that are of interest. The constraints on the temperature in turn mean that the body must lie within a certain range of distances from the star, in the so-called Habitable Zone (HZ). The body must also be ma ...
... an atmosphere must be present, and limits are set for what ranges of temperature and pressure that are of interest. The constraints on the temperature in turn mean that the body must lie within a certain range of distances from the star, in the so-called Habitable Zone (HZ). The body must also be ma ...
ExpandHorizons_06 - Hanford
... Brought to you by the National Science Foundation; operated by Caltech and MIT; the research focus for more than 500 LIGO Scientific Collaboration members worldwide. LIGO-G060230-00-Z ...
... Brought to you by the National Science Foundation; operated by Caltech and MIT; the research focus for more than 500 LIGO Scientific Collaboration members worldwide. LIGO-G060230-00-Z ...
Finding KBO Flyby Targets for New Horizons
... the densest sections of the Milky Way until shortly before the Pluto encounter. Because candidate targets must be observed for 2-3 years to determine a good orbit, targets for the 2015 Pluto flyby trajectory must be identified by about 2012, while the search area is still deep in the Milky Way, thou ...
... the densest sections of the Milky Way until shortly before the Pluto encounter. Because candidate targets must be observed for 2-3 years to determine a good orbit, targets for the 2015 Pluto flyby trajectory must be identified by about 2012, while the search area is still deep in the Milky Way, thou ...
astronomy (astr)
... ASTR 102. Introduction to Astronomy: Stars, Galaxies & Cosmology. 3 Credits. The sun, stellar observables, star birth, evolution, and death, novae and supernovae, white dwarfs, neutron stars, black holes, the Milky Way galaxy, normal galaxies, active galaxies and quasars, dark matter, dark energy, c ...
... ASTR 102. Introduction to Astronomy: Stars, Galaxies & Cosmology. 3 Credits. The sun, stellar observables, star birth, evolution, and death, novae and supernovae, white dwarfs, neutron stars, black holes, the Milky Way galaxy, normal galaxies, active galaxies and quasars, dark matter, dark energy, c ...
Survey of Astronomy A110 The Nature of Stars
... – 2. Stars on the main sequence have luminosity class V. Stars above the main sequence have luminosity classes I through IV. ...
... – 2. Stars on the main sequence have luminosity class V. Stars above the main sequence have luminosity classes I through IV. ...
The Scuti star XX Pyx is an ellipsoidal variable
... abundance values. We show that an increase in the relative number fraction of iron throughout the whole star or a large decrease in the initial hydrogen abundance make the stellar models matching the four selected modes satisfy all observational constraints and we provide the general properties of ...
... abundance values. We show that an increase in the relative number fraction of iron throughout the whole star or a large decrease in the initial hydrogen abundance make the stellar models matching the four selected modes satisfy all observational constraints and we provide the general properties of ...
ISA_lecture02
... Upper Right: Galileo; visible light. Lower Left: Keck AO; L-band, 3.5micron. Lower Right: Keck without adaptive optics. © NASA/JPL-Caltech ...
... Upper Right: Galileo; visible light. Lower Left: Keck AO; L-band, 3.5micron. Lower Right: Keck without adaptive optics. © NASA/JPL-Caltech ...
Pluto Fast Flyby: An Overview of the Mission and
... missions to Pluto and reported their findings to the National Aeronautics and Space Administration (NASA) in May, 1991. In subsequent meetings with NASA, OPSWG formally endorsed the JPL team’s very small spacecraft mission. The Mission Dcskn [1 ,2,3] ...
... missions to Pluto and reported their findings to the National Aeronautics and Space Administration (NASA) in May, 1991. In subsequent meetings with NASA, OPSWG formally endorsed the JPL team’s very small spacecraft mission. The Mission Dcskn [1 ,2,3] ...
Chapter 15 THE MILKY WAY IN RELATION TO OTHER GALAXIES
... (van der Kruit, 1987), which is also smaller than the 6 kpc for the surface brightness. Hodge’s value for hHII for the Galaxy is 2.35±0.05 kpc, which would be consistent with the Galaxy also being of type Sb. However, using other data hHII can also be estimated as 4.6±1.0 kpc (van der Kruit, 1987). ...
... (van der Kruit, 1987), which is also smaller than the 6 kpc for the surface brightness. Hodge’s value for hHII for the Galaxy is 2.35±0.05 kpc, which would be consistent with the Galaxy also being of type Sb. However, using other data hHII can also be estimated as 4.6±1.0 kpc (van der Kruit, 1987). ...
Spectroscopic confirmation of a galaxy at redshift z=8.6
... photons from increasingly distant galaxies places important constraints on the timing, location and nature of the sources responsible for reionization. Here we report the detection of Lya photons emitted less than 600 million years after the Big Bang. UDFy-38135539 (ref. 5) is at a redshift of z 5 8 ...
... photons from increasingly distant galaxies places important constraints on the timing, location and nature of the sources responsible for reionization. Here we report the detection of Lya photons emitted less than 600 million years after the Big Bang. UDFy-38135539 (ref. 5) is at a redshift of z 5 8 ...
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.