Protostellar/PMS Mass Infall Luminosity Problem
... sample from 112 to 230 protostars, but 100 of the new sources lacks sub-mm detections, so their totoal luminosity is underestimated by a factor of 2.6 on average (could be up to 10). The low luminosity tail of the PLF is very uncertain ...
... sample from 112 to 230 protostars, but 100 of the new sources lacks sub-mm detections, so their totoal luminosity is underestimated by a factor of 2.6 on average (could be up to 10). The low luminosity tail of the PLF is very uncertain ...
ppt
... Every CCD has different pixel-to-pixel sensitivity, defects, dust particles, etc that not only make the image look bad, but if the sensitivity of pixels change with time can influence your results. Every observation must be divided by a flat field after bias subtraction. The flat field is an observa ...
... Every CCD has different pixel-to-pixel sensitivity, defects, dust particles, etc that not only make the image look bad, but if the sensitivity of pixels change with time can influence your results. Every observation must be divided by a flat field after bias subtraction. The flat field is an observa ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... integrated all the neutral hydrogen into a single profile; all spatial information was lost. Recently, both optical and radio instrumentation has developed sufficiently so that detailed rotation curves of high accuracy can be obtained across most of a galactic disk. An outstanding recent study of ro ...
... integrated all the neutral hydrogen into a single profile; all spatial information was lost. Recently, both optical and radio instrumentation has developed sufficiently so that detailed rotation curves of high accuracy can be obtained across most of a galactic disk. An outstanding recent study of ro ...
How Our Place in The Cosmos is Designed for
... less all over the planet. Each time, there is the same astonishment and, each time, the feeling has grown that eclipses are not just astronomical events, that they are more than that, and that the emotion, the real internal upheaval, that they produce—a mixture of respect and also empathy with natur ...
... less all over the planet. Each time, there is the same astonishment and, each time, the feeling has grown that eclipses are not just astronomical events, that they are more than that, and that the emotion, the real internal upheaval, that they produce—a mixture of respect and also empathy with natur ...
Detection of Earth-impacting asteroids with the next generation all
... pletion but lower risk and lower cost). Their recommendation dovetailed nicely with the Astronomy and Astrophysics Survey Committee (2001) Decadal Report that made a strong case for the development of a large synoptic survey telescope that would provide the necessary depth and sky coverage to identi ...
... pletion but lower risk and lower cost). Their recommendation dovetailed nicely with the Astronomy and Astrophysics Survey Committee (2001) Decadal Report that made a strong case for the development of a large synoptic survey telescope that would provide the necessary depth and sky coverage to identi ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... system, defined by the positions on one of the V frames. The correction included terms for pixel scale (identical in x and y) and for rotation; the latter correction, however, was insignificant. The next step was to combine the several magnitudes in each filter into three lists of average instrument ...
... system, defined by the positions on one of the V frames. The correction included terms for pixel scale (identical in x and y) and for rotation; the latter correction, however, was insignificant. The next step was to combine the several magnitudes in each filter into three lists of average instrument ...
Archaeoastronomical Study of the Main Pyramids of Giza
... (see Belmonte, Shaltout, & Fekri, 2008, and references therein). It was well documented that, as early as the Middle Kingdom, the Egyptian astronomers were able to track the movements (recording the times of rising, culmination, setting, the period of invisibility and so on) of a set of 36 stars, or ...
... (see Belmonte, Shaltout, & Fekri, 2008, and references therein). It was well documented that, as early as the Middle Kingdom, the Egyptian astronomers were able to track the movements (recording the times of rising, culmination, setting, the period of invisibility and so on) of a set of 36 stars, or ...
Detection and Discovery of Near-Earth Asteroids by the LINEAR
... Ceres was discovered through the laborious process of making direct visual observations with a telescope in order to create a hand-drawn star chart. After observations were made over a period of days, Ceres was found to move in the sky, leading to the conclusion that it was a planet-like object in o ...
... Ceres was discovered through the laborious process of making direct visual observations with a telescope in order to create a hand-drawn star chart. After observations were made over a period of days, Ceres was found to move in the sky, leading to the conclusion that it was a planet-like object in o ...
PPT - University of Waterloo
... medium resolution spectroscopy in 2'x2' • PACS: spectroscopy with velocity resolution of 100-250 km/s and 1300-3000 km/s coverage or imaging with two 25x16 arrays at 80-130 and 130-210 μm simultaneously • HIFI: very high spectral resolution heterodyne spectroscopy spanning 480-1250 and 1410-1910 GHz ...
... medium resolution spectroscopy in 2'x2' • PACS: spectroscopy with velocity resolution of 100-250 km/s and 1300-3000 km/s coverage or imaging with two 25x16 arrays at 80-130 and 130-210 μm simultaneously • HIFI: very high spectral resolution heterodyne spectroscopy spanning 480-1250 and 1410-1910 GHz ...
The Terrestrial Planet Finder Mission
... These diffraction rings are bright relative to any planet that might be orbiting a nearby star and so would completely hide the planet. The Sun, for example, would appear 1010 times brighter than the Earth to a distant observer. By placing a mask over the pupil, one can control the shape and strengt ...
... These diffraction rings are bright relative to any planet that might be orbiting a nearby star and so would completely hide the planet. The Sun, for example, would appear 1010 times brighter than the Earth to a distant observer. By placing a mask over the pupil, one can control the shape and strengt ...
Spectral classification of O–M stars on the basis of UBV photometry
... young B or late F–G stars. In order to determine correct spectral type we applied the next criterion. In general, it may be modified, depending on the peculiarities of the character of the absorbing medium and star distribution in the space, and on interval of star magnitudes where spectral classifi ...
... young B or late F–G stars. In order to determine correct spectral type we applied the next criterion. In general, it may be modified, depending on the peculiarities of the character of the absorbing medium and star distribution in the space, and on interval of star magnitudes where spectral classifi ...
Horace Welcome Babcock - National Academy of Sciences
... would later pursue his thesis observational work. Babcock regarded Mayall’s extragalactic research with his nebular spectrograph at Lick’s Crossley telescope as a “shining example of achievement.” Horace credits Mayall for proposing measurement of the rotation of the galaxy M31 (Andromeda Nebula) ...
... would later pursue his thesis observational work. Babcock regarded Mayall’s extragalactic research with his nebular spectrograph at Lick’s Crossley telescope as a “shining example of achievement.” Horace credits Mayall for proposing measurement of the rotation of the galaxy M31 (Andromeda Nebula) ...
SPIRAL STRUCTURE IN THE OUTER GALACTIC
... faint stars difficult. Yet they contain massive (i.e., hot) stars that can be used to derive their parameters. The classical photometric method to address memberships in young clusters (e.g., Baume et al. 1999) simultaneously checks the consistency of the location of each star in several photometric ...
... faint stars difficult. Yet they contain massive (i.e., hot) stars that can be used to derive their parameters. The classical photometric method to address memberships in young clusters (e.g., Baume et al. 1999) simultaneously checks the consistency of the location of each star in several photometric ...
Astronomy Review - Mona Shores Blogs
... Theory? 1. The galaxies are all moving away from us, so the Universe must be expanding. 2. The Universe if filled with radiation, known as the “Cosmic Microwave Background Radiation”, that is left over energy from the explosion that started the “Big Bang”. ...
... Theory? 1. The galaxies are all moving away from us, so the Universe must be expanding. 2. The Universe if filled with radiation, known as the “Cosmic Microwave Background Radiation”, that is left over energy from the explosion that started the “Big Bang”. ...
A terrestrial planet candidate in a temperate orbit around
... approximately 83 d (ref. 3). Spectroscopic activity indices were measured on all of the HARPS spectra, and their time series were also investigated. The width of the spectral lines (measured as the variance of the mean line, or m2) follows a time dependence that is almost identical to the light curv ...
... approximately 83 d (ref. 3). Spectroscopic activity indices were measured on all of the HARPS spectra, and their time series were also investigated. The width of the spectral lines (measured as the variance of the mean line, or m2) follows a time dependence that is almost identical to the light curv ...
20. Meteorites and the chemical evolution of the Milky Way
... (Scalo, 1986). In most models it is assumed that the IMF is constant in space and time; this is consistent with observational evidence (Kroupa, 2002). 5. Except for the simplest models (see next section), infall of gas from the halo onto the disk and outflows from galactic winds are often included i ...
... (Scalo, 1986). In most models it is assumed that the IMF is constant in space and time; this is consistent with observational evidence (Kroupa, 2002). 5. Except for the simplest models (see next section), infall of gas from the halo onto the disk and outflows from galactic winds are often included i ...
Celestial Navitation - National University of Singapore
... estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
... estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
Andrés Muñoz-Jaramillo, PhD - Solar Cycle and Solar Dynamo
... G. Tlatov, A. A. Pevtsov, L. A. Balmaceda, E. E. DeLuca, & P. C. H. Martens, ApJ, 804, 68 (2015). 4. Small-scale and global dynamos, and the area and flux Distributions of active regions, sunspot groups, and sunspots: A multi-database study. A. Muñoz-Jaramillo, R. R. Senkpeil, J. C. Windmueller, E. C ...
... G. Tlatov, A. A. Pevtsov, L. A. Balmaceda, E. E. DeLuca, & P. C. H. Martens, ApJ, 804, 68 (2015). 4. Small-scale and global dynamos, and the area and flux Distributions of active regions, sunspot groups, and sunspots: A multi-database study. A. Muñoz-Jaramillo, R. R. Senkpeil, J. C. Windmueller, E. C ...
m, a, e
... parts. This was done by comparing IR spectra obtained with single dish telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
... parts. This was done by comparing IR spectra obtained with single dish telescopes with those obtained while combining several such telescopes into an interferometric array (this technique, long practiced by radio astronomers, allows us to achieve very good, low-angular resolution, observations). ...
arXiv:astro-ph/9701131v1 18 Jan 1997
... of composition gradients which are ultimately responsible (in part) for a star’s ascent up the red giant branch. The lowest mass stars burn all their hydrogen into helium over an η = 13 time scale, and then quietly fade from prominence as helium white dwarfs. This general evolutionary scenario is de ...
... of composition gradients which are ultimately responsible (in part) for a star’s ascent up the red giant branch. The lowest mass stars burn all their hydrogen into helium over an η = 13 time scale, and then quietly fade from prominence as helium white dwarfs. This general evolutionary scenario is de ...
W.M. Keck Observatory Annual Report 2009
... of these worlds identified within the last fifteen years, modern astronomers continue their hunt for the planets with the lowest possible mass. The Keck I telescope has been the most prolific scientific instrument in the world for finding exoplanets, the majority of them being gas giants, like Jupit ...
... of these worlds identified within the last fifteen years, modern astronomers continue their hunt for the planets with the lowest possible mass. The Keck I telescope has been the most prolific scientific instrument in the world for finding exoplanets, the majority of them being gas giants, like Jupit ...