Proto-planetary disks
... • Transition objects are seen at higher rate in old clusters (Megeath et al. 2006) • Very few CTTS are diskless, while most WTTS are diskless (Padgett et al. 2006), meaning more likely for dust to persist without gas than vice versa (Lada et al. 2006) • Disks of low mass stars last longer than th ...
... • Transition objects are seen at higher rate in old clusters (Megeath et al. 2006) • Very few CTTS are diskless, while most WTTS are diskless (Padgett et al. 2006), meaning more likely for dust to persist without gas than vice versa (Lada et al. 2006) • Disks of low mass stars last longer than th ...
![arXiv:1505.07406v1 [hep-ph] 27 May 2015](http://s1.studyres.com/store/data/007750137_1-1343a5635a0dda57ac4b2d01226e2ce5-300x300.png)
arXiv:1505.07406v1 [hep-ph] 27 May 2015
... goal can be achieved in the framework of a quantum cosmological model, constructed by assuming homogeneity and isotropy in the full Quantum Gravity theory, and thus reducing it effectively to a finite dimensional model. Unfortunately, there is no unique way to perform such reduction to quantum cosmo ...
... goal can be achieved in the framework of a quantum cosmological model, constructed by assuming homogeneity and isotropy in the full Quantum Gravity theory, and thus reducing it effectively to a finite dimensional model. Unfortunately, there is no unique way to perform such reduction to quantum cosmo ...
Chap 16: Galaxies
... Q: The first question of our mid-term exam tells us that the farthest star can be seen by naked eyes should be 5167 light years away. Why are we able to see Andromeda galaxy (M31) which is about 2.54 million light years away without aid when the night sky is clear? A: Surely we can’t see a star whic ...
... Q: The first question of our mid-term exam tells us that the farthest star can be seen by naked eyes should be 5167 light years away. Why are we able to see Andromeda galaxy (M31) which is about 2.54 million light years away without aid when the night sky is clear? A: Surely we can’t see a star whic ...
Bayesian mass and age estimates for transiting exoplanet host stars⋆
... more sensitive to the change in radius of a star as it evolves away from the main sequence. However, precise stellar densities can also cause problems because the broad sampling in mass, age and metallicity used for many grids of stellar models can produce poor sampling of the observed parameter spa ...
... more sensitive to the change in radius of a star as it evolves away from the main sequence. However, precise stellar densities can also cause problems because the broad sampling in mass, age and metallicity used for many grids of stellar models can produce poor sampling of the observed parameter spa ...
Lecture 7: Extrasolar Planets 01/08/2013 update: 725 exoplanets
... Einstein's General Theory of Relativity. According to Einstein, when the light emanating from a star passes very close to another star on its way to an observer on Earth, the gravity of the intermediary star will slightly bend the light rays from the source star, causing the two stars to appear fart ...
... Einstein's General Theory of Relativity. According to Einstein, when the light emanating from a star passes very close to another star on its way to an observer on Earth, the gravity of the intermediary star will slightly bend the light rays from the source star, causing the two stars to appear fart ...
400 YEARS OF THE TELESCOPE
... of him on my laptop. The telescope’s narrow field of view made it difficult for him to find Jupiter, but when he did, ...
... of him on my laptop. The telescope’s narrow field of view made it difficult for him to find Jupiter, but when he did, ...
The Final Version of the White Paper is available.
... planets, their interactions with the gaseous disc in which they are embedded and with other growing bodies. While the search for solar system analogues is still on going, the first spectra of exoplanets have been taken, signalling the shift from an era of discovery to one of physical and chemical ch ...
... planets, their interactions with the gaseous disc in which they are embedded and with other growing bodies. While the search for solar system analogues is still on going, the first spectra of exoplanets have been taken, signalling the shift from an era of discovery to one of physical and chemical ch ...
Ben R. Oppenheimer1,2 and Sasha Hinkley1,2
... suggests that a generalized planetary system architecture is not, probably, common. For example, it may be easier for massive planets to form at larger distances from their stars, where the feeding zones during formation are larger. If these massive planets migrate to become “hot Jupiters, ” in the ...
... suggests that a generalized planetary system architecture is not, probably, common. For example, it may be easier for massive planets to form at larger distances from their stars, where the feeding zones during formation are larger. If these massive planets migrate to become “hot Jupiters, ” in the ...
The Catalina Sky Survey NEO Follow-up
... • 100% dedicated to NEO survey + follow-up • Assets: 3 survey telescopes + 1 follow up telescope • Cadence: 4 x 30 s images, deltaT ~10 min. ...
... • 100% dedicated to NEO survey + follow-up • Assets: 3 survey telescopes + 1 follow up telescope • Cadence: 4 x 30 s images, deltaT ~10 min. ...
Star formation and internal kinematics of irregular galaxies
... the relatively slow rotation of the Irregulars makes it difficult to generate strong densitywave shocks (Gallagher & Hunter 1984). Without this periodic stimulus acting upon upon clouds in their ISM (Elmegreen & Elmegreen 1983), other processes that trigger star ...
... the relatively slow rotation of the Irregulars makes it difficult to generate strong densitywave shocks (Gallagher & Hunter 1984). Without this periodic stimulus acting upon upon clouds in their ISM (Elmegreen & Elmegreen 1983), other processes that trigger star ...
Fast Facts - Canada France Hawaii Telescope
... CFHT’s main users are scientists from Canada, France, and Hawaii. Collaborative agreements also offer access to the telescope by the astronomical communities of Taiwan, Brazil, and China. Access is granted following a competitive process based on the scientific quality of the proposals and their ade ...
... CFHT’s main users are scientists from Canada, France, and Hawaii. Collaborative agreements also offer access to the telescope by the astronomical communities of Taiwan, Brazil, and China. Access is granted following a competitive process based on the scientific quality of the proposals and their ade ...
Enhanced lithium depletion in Sun-like stars with orbiting planets.
... 451 stars in the HARPS high precision (better than 1 m/s) radial velocity exoplanet survey11 spanning the effective temperature range between 4900 and 6500 K. These are unevolved, slowly rotating non-active stars from a CORALIE catalogue11. These stars have been monitored with high precision spectro ...
... 451 stars in the HARPS high precision (better than 1 m/s) radial velocity exoplanet survey11 spanning the effective temperature range between 4900 and 6500 K. These are unevolved, slowly rotating non-active stars from a CORALIE catalogue11. These stars have been monitored with high precision spectro ...
Astronomical Picture of the Day
... How do huge clusters of galaxies evolve? To help find out, astronomers pointed the wideangle Burrell-Schmidt telescope on Kitt Peak National Observatory in Arizona, USA at the nearby Virgo Cluster of Galaxies. After hundreds of 15-minute exposures taken over two months in early 2004, the result is a ...
... How do huge clusters of galaxies evolve? To help find out, astronomers pointed the wideangle Burrell-Schmidt telescope on Kitt Peak National Observatory in Arizona, USA at the nearby Virgo Cluster of Galaxies. After hundreds of 15-minute exposures taken over two months in early 2004, the result is a ...
1. INTRODUCTION
... JUP Marcy 1997 ; Marcy et al. 2000). The planet candidates detected from precision radial velocity surveys reveal a mass distribution that rises toward lower masses, from D8 to 0.4 M , which is the lowest JUP M sin i currently detected. Remarkably, all 12 planets that orbit beyond 0.2 AU reside in n ...
... JUP Marcy 1997 ; Marcy et al. 2000). The planet candidates detected from precision radial velocity surveys reveal a mass distribution that rises toward lower masses, from D8 to 0.4 M , which is the lowest JUP M sin i currently detected. Remarkably, all 12 planets that orbit beyond 0.2 AU reside in n ...
FREE Sample Here
... 9) Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years. Answer: FALSE 10) Earth is always precisely 1 AU from the Sun. Answer: FALSE ...
... 9) Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years. Answer: FALSE 10) Earth is always precisely 1 AU from the Sun. Answer: FALSE ...
Low-Res Version - Chandra X
... as radio, infra-red, ultra-violet and gamma, cannot be seen with the human eye, and thus do not have any "color". To see the invisible wavelengths, we need detectors that are especially designed to see those other wavelengths, such as the instruments on Chandra. Sometimes images taken by telescopes ...
... as radio, infra-red, ultra-violet and gamma, cannot be seen with the human eye, and thus do not have any "color". To see the invisible wavelengths, we need detectors that are especially designed to see those other wavelengths, such as the instruments on Chandra. Sometimes images taken by telescopes ...
NGC 625 AAS
... kpc in Tol 1924-416, and larger than 8.1 kpc in IRAS 08339+6517. Both systems are revealed to be tidally interacting: Tol 1924-416 with ESO 338-IG04B (6.6΄ = 72 kpc minimum separation), and IRAS 08339+6517 with 2MASX J08380769+6508579 (2.4΄ = 56 kpc minimum separation). The HI emission is extended i ...
... kpc in Tol 1924-416, and larger than 8.1 kpc in IRAS 08339+6517. Both systems are revealed to be tidally interacting: Tol 1924-416 with ESO 338-IG04B (6.6΄ = 72 kpc minimum separation), and IRAS 08339+6517 with 2MASX J08380769+6508579 (2.4΄ = 56 kpc minimum separation). The HI emission is extended i ...
Document
... Time and space did not exist until the Big-Bang event (estimated to have occurred about 15 billion years ago). The contents of the entire Universe was once compressed into a point the ‘size’ of a single electron. The Universe must have initially “inflated” in size, expanding many times faster than t ...
... Time and space did not exist until the Big-Bang event (estimated to have occurred about 15 billion years ago). The contents of the entire Universe was once compressed into a point the ‘size’ of a single electron. The Universe must have initially “inflated” in size, expanding many times faster than t ...
Calibration of Non-Spatially-Filtered Data in Optical
... white dwarf companions (like Mira A when it dies), we should be able to find many systems that formed like Mira B. • So… We discovered that around Mira B is a new kind of protoplanetary disk, formed from the wind of a dying star. This is the first detection of this kind of disk. ...
... white dwarf companions (like Mira A when it dies), we should be able to find many systems that formed like Mira B. • So… We discovered that around Mira B is a new kind of protoplanetary disk, formed from the wind of a dying star. This is the first detection of this kind of disk. ...
2.4m Telescope Group Yunnan Observatory of CAS
... * A nearly perfect match of ~15 min exposure time requirements and photon noise limit offered by a 2 meter telescope for 0.5-1 m/s • For astro-seismology, only target V<5 stars and ~1 min exposures * Target faint solar type stars up to V~12 for moderate-high Doppler precision measurements • Offer co ...
... * A nearly perfect match of ~15 min exposure time requirements and photon noise limit offered by a 2 meter telescope for 0.5-1 m/s • For astro-seismology, only target V<5 stars and ~1 min exposures * Target faint solar type stars up to V~12 for moderate-high Doppler precision measurements • Offer co ...
13.1 Introduction 13.2 The Red Giant Branch
... Figure 13.2: Colour-magnitude diagram (CMD) of 60 000 stars in the field of the globular cluster M54, which also includes the dwarf spheroidal galaxy Sagittarius (Sgr), which is in the process of merging with our own Galaxy. Multiple populations, of different ages and metallicities, can be distingui ...
... Figure 13.2: Colour-magnitude diagram (CMD) of 60 000 stars in the field of the globular cluster M54, which also includes the dwarf spheroidal galaxy Sagittarius (Sgr), which is in the process of merging with our own Galaxy. Multiple populations, of different ages and metallicities, can be distingui ...
STELLAR CLASSIFICATIONS: TYPE “O” STARS
... Stellar objects with these classifications are not technically stars, but are still worth knowing. These are “sub-stellar” objects, commonly called red and brown dwarfs. What distinguishes these objects from real stars is that dwarfs do not undergo stellar fusion. Their cores never quite reach a hig ...
... Stellar objects with these classifications are not technically stars, but are still worth knowing. These are “sub-stellar” objects, commonly called red and brown dwarfs. What distinguishes these objects from real stars is that dwarfs do not undergo stellar fusion. Their cores never quite reach a hig ...
Robert_Minchin_Galaxies_2011_REU
... stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxies, which are gas poor, velocity dispersions from stellar spectroscopy can be used ...
... stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxies, which are gas poor, velocity dispersions from stellar spectroscopy can be used ...
File - Mr. Catt`s Class
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
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.