Annual Report 2006/2007
... the five universities participating in NOVA. This number includes ~60 fte senior staff members in permanent and tenure-track positions, 40 fte postdoctoral fellows, 130 fte PhD students, and ~40 fte staff working on instrumentation projects. NOVA funds about 19% of these positions, as well as an act ...
... the five universities participating in NOVA. This number includes ~60 fte senior staff members in permanent and tenure-track positions, 40 fte postdoctoral fellows, 130 fte PhD students, and ~40 fte staff working on instrumentation projects. NOVA funds about 19% of these positions, as well as an act ...
CH13.AST1001.S15.EDS
... Protostar to Main Sequence • A protostar contracts and heats until the core temperature is sufficient for hydrogen fusion. • Contraction ends when energy released by hydrogen fusion balances energy radiated from the surface. • It takes 30 million years for a star like the Sun (less time for more ma ...
... Protostar to Main Sequence • A protostar contracts and heats until the core temperature is sufficient for hydrogen fusion. • Contraction ends when energy released by hydrogen fusion balances energy radiated from the surface. • It takes 30 million years for a star like the Sun (less time for more ma ...
12C13C1414N21312C/13C3he43He/4He Sub-surface
... These two convection zones comprise almost negligible amount of mass. The reality of the ...
... These two convection zones comprise almost negligible amount of mass. The reality of the ...
Did the division of the year by the Babylonians into twelve months
... positivists on historians of science, when the model of western science provided the standard against which all other sciences would be judged, the ancient Greeks were assumed to be the inventors of science… Despite the acknowledgement of an intellectual transmission from Babylonia to the Greeks, wh ...
... positivists on historians of science, when the model of western science provided the standard against which all other sciences would be judged, the ancient Greeks were assumed to be the inventors of science… Despite the acknowledgement of an intellectual transmission from Babylonia to the Greeks, wh ...
The Clouds
... young stellar objects are detected in near-infrared images. In addition, 73 small evaporating gaseous globules (EGGs) have been detected on the ...
... young stellar objects are detected in near-infrared images. In addition, 73 small evaporating gaseous globules (EGGs) have been detected on the ...
Dynamical Mass Measurements of Pre-Main
... is a particularly important case study, for it comprises two young brown dwarfs (BDs) (Stassun et al., 2006). With masses of 0.034 M and 0.054 M , presently these stars alone constrain PMS stellar evolutionary theory below 0.3 M . Both the colors and spectra indicate that the primary BD has a spectr ...
... is a particularly important case study, for it comprises two young brown dwarfs (BDs) (Stassun et al., 2006). With masses of 0.034 M and 0.054 M , presently these stars alone constrain PMS stellar evolutionary theory below 0.3 M . Both the colors and spectra indicate that the primary BD has a spectr ...
Astrometry of Asteroids
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
Astrometry of Asteroids
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
Follow Proxima Centauri - Department of Physics and Astronomy
... the Earth moves 1 astronomical unit would be 1 arcsecond. A star 2 parsecs away would have a parallax of 1/2 arcsecond, 3 parsecs and it would be 1/3 ..., 10 parsecs 1/10th and so on. A parsec is 3.26 light years, and Proxima Centauri is 1.3 parsecs. If we could watch it appear to move during the ye ...
... the Earth moves 1 astronomical unit would be 1 arcsecond. A star 2 parsecs away would have a parallax of 1/2 arcsecond, 3 parsecs and it would be 1/3 ..., 10 parsecs 1/10th and so on. A parsec is 3.26 light years, and Proxima Centauri is 1.3 parsecs. If we could watch it appear to move during the ye ...
Introduction to Observational Cosmology
... – For compact or unresolved objects surveys are flux-limited (separate flux limit in each observational band). – For extended objects surveys are surface brightness limited (i.e. limited by the contrast to the background) ...
... – For compact or unresolved objects surveys are flux-limited (separate flux limit in each observational band). – For extended objects surveys are surface brightness limited (i.e. limited by the contrast to the background) ...
Astrometry of Asteroids
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
... In this exercise, you’ll only be looking at a few specific spots in the sky . To save room on your computer, we’ve extracted only part of the GSC and stored it on your computer for use in this exercise. The Technique of Astrometry: Finding the Coordinates of Unknown Objects The lines of right ascens ...
Multiwavelength properties of γ-ray loud binary systems.
... Cyg X-3 and PSR B1259-63. Remarkably, there are no signatures of weaker variability which could be clearly associated to other binary systems with black holes and /or neutron stars. Recent discovery of the γ-ray flaring activity of the Crab pulsar shows that pulsars (or the inner compact parts of th ...
... Cyg X-3 and PSR B1259-63. Remarkably, there are no signatures of weaker variability which could be clearly associated to other binary systems with black holes and /or neutron stars. Recent discovery of the γ-ray flaring activity of the Crab pulsar shows that pulsars (or the inner compact parts of th ...
The ISO–SWS Spectrum of Planetary Nebula NGC 7027
... number 55800537) was chosen because of its highest signal to noise ratio. NGC 7027’s infrared size is sufficiently smaller than the different sizes of the apertures used with SWS to offer no problem. A VLA radio image of NGC 7027 at 14.7 GHz obtained by Roelfsema et al. (1991) clearly stays within t ...
... number 55800537) was chosen because of its highest signal to noise ratio. NGC 7027’s infrared size is sufficiently smaller than the different sizes of the apertures used with SWS to offer no problem. A VLA radio image of NGC 7027 at 14.7 GHz obtained by Roelfsema et al. (1991) clearly stays within t ...
Chapter 15 Stars, Galaxies and Universe
... • Positive magnitude numbers represent dim stars. Negative magnitude numbers represent bright stars. • The brightest star in the night sky, Sirius, has a magnitude of -1.4. ...
... • Positive magnitude numbers represent dim stars. Negative magnitude numbers represent bright stars. • The brightest star in the night sky, Sirius, has a magnitude of -1.4. ...
Oxygen and Neon Abundances of B-Type Stars in Comparison with
... contradicting the Galactic chemical evolution, we carried out oxygen abundance determinations for 64 mid- through late-B stars by using the O I 6156–8 lines while taking into account the non-LTE effect, and compared them with the solar O abundance established in the same manner. The resulting mean o ...
... contradicting the Galactic chemical evolution, we carried out oxygen abundance determinations for 64 mid- through late-B stars by using the O I 6156–8 lines while taking into account the non-LTE effect, and compared them with the solar O abundance established in the same manner. The resulting mean o ...
Hipparcos distance estimates of the Ophiuchus and the Lupus cloud
... dark molecular clouds and their dense cores. One of the main motivations for these investigations is the study of the process of star and planet formation in its entirety, and a deeper understanding of the effects of the local environment. A key aspect of the scientific analysis of a dark molecular c ...
... dark molecular clouds and their dense cores. One of the main motivations for these investigations is the study of the process of star and planet formation in its entirety, and a deeper understanding of the effects of the local environment. A key aspect of the scientific analysis of a dark molecular c ...
exoplanet observing for amateurs
... fade by a small amount for a short time (e.g., <0.030 magnitude for ~3 hours), and when these fading events occur at regular intervals (~3 days, typically), a larger aperture telescope with good spatial resolution must be used to determine if the brightest star in the survey camera’s image faded a s ...
... fade by a small amount for a short time (e.g., <0.030 magnitude for ~3 hours), and when these fading events occur at regular intervals (~3 days, typically), a larger aperture telescope with good spatial resolution must be used to determine if the brightest star in the survey camera’s image faded a s ...
The low-mass dispersed population around the Lupus clouds
... and 4), providing diagnostic features of temperature and surface gravity as well as accretion/outflow diagnostic lines near Hα. It also includes the LiI line at 6708 Å, but unfortunately the combination of resolution and signal-to-noise ratio of our spectra provide only upper limits of no practical ...
... and 4), providing diagnostic features of temperature and surface gravity as well as accretion/outflow diagnostic lines near Hα. It also includes the LiI line at 6708 Å, but unfortunately the combination of resolution and signal-to-noise ratio of our spectra provide only upper limits of no practical ...
Which planet has never been orbited or flown past by a
... Dr. C. Renee James NASA Top Stars 2010 ...
... Dr. C. Renee James NASA Top Stars 2010 ...
Hidden57_rf
... This stunningly colourful picture shows off the rich structure of the supernova remnant Cassiopeia A. It is composed of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray ...
... This stunningly colourful picture shows off the rich structure of the supernova remnant Cassiopeia A. It is composed of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray ...
The Sun
... suggest that the answer is yes. – The spectra of many stars contain emission lines in the far ultraviolet that could only have formed in the low-density, high-temperature gases of a chromosphere and corona. ...
... suggest that the answer is yes. – The spectra of many stars contain emission lines in the far ultraviolet that could only have formed in the low-density, high-temperature gases of a chromosphere and corona. ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.