Fast Auto-Focus Method and Software for CCD-based
... far from Best Focus (user selected inside or outside of Best Focus) 2. A full frame 3x3 binned image is taken with a minimal exposure time 3. The brightest star is found, the position determined and the HFD measured 4. The target star is sub-framed and a second exposure taken (download time is minim ...
... far from Best Focus (user selected inside or outside of Best Focus) 2. A full frame 3x3 binned image is taken with a minimal exposure time 3. The brightest star is found, the position determined and the HFD measured 4. The target star is sub-framed and a second exposure taken (download time is minim ...
Slide 1
... name is given to an ellipse with that eccentricity? Maximum e is 1. An ellipse whose e =1 is a line. ...
... name is given to an ellipse with that eccentricity? Maximum e is 1. An ellipse whose e =1 is a line. ...
A Reminder of the Policy on Collaboration: We allow and expect you
... C. When astrological charts were first established, more than 3000 years ago, the sun was “in” Aries on the vernal equinox (around March 21st). Nowadays, on the vernal equinox, the sun is “in” Pisces2. Why has this shift occurred? Hint: This shift was caused by one of the motions of the earth you ha ...
... C. When astrological charts were first established, more than 3000 years ago, the sun was “in” Aries on the vernal equinox (around March 21st). Nowadays, on the vernal equinox, the sun is “in” Pisces2. Why has this shift occurred? Hint: This shift was caused by one of the motions of the earth you ha ...
Abstract book
... is currently matter of controversy and depends very much on the own definition of cluster. The cluster definition and hence the morphologies of individual clusters appear to vary significantly from region to region, as well as with age, which suggests that either, star formation in clusters is not uni ...
... is currently matter of controversy and depends very much on the own definition of cluster. The cluster definition and hence the morphologies of individual clusters appear to vary significantly from region to region, as well as with age, which suggests that either, star formation in clusters is not uni ...
Binary mass ratios: system mass not primary mass
... We argue that to compare binaries one must examine the distributions of binary properties by system mass rather than by primary mass. If most binaries are primordial (as we argued above) then some physical process acts to fragment (or not) a system into two components and distributes the mass betwee ...
... We argue that to compare binaries one must examine the distributions of binary properties by system mass rather than by primary mass. If most binaries are primordial (as we argued above) then some physical process acts to fragment (or not) a system into two components and distributes the mass betwee ...
Essential physics of early galaxy formation
... their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficiency such that the energy produced by newly-formed stars is sufficient to expel all the remaining gas, quenching fur ...
... their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficiency such that the energy produced by newly-formed stars is sufficient to expel all the remaining gas, quenching fur ...
Hipparcos distance estimates of the Ophiuchus and the Lupus cloud
... Note that the reliability of the maximum-likelihood technique presented here was also checked with numerical simulations. It is well known that the maximum-likelihood method is, under certain circumstances (verified in our case), asymptotically unbiased; however, we decided to test its behaviour in ...
... Note that the reliability of the maximum-likelihood technique presented here was also checked with numerical simulations. It is well known that the maximum-likelihood method is, under certain circumstances (verified in our case), asymptotically unbiased; however, we decided to test its behaviour in ...
Document
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
A trip to the end of the universe and the twin “paradox”
... The purpose of this article is to emphasize the local perspective of each twin in the well known twin paradox who can only do measurements with respect to his/her individual reference frame. This local perspective resembles Bondi’s k-calculus1 or the concept of radar time as discussed by Dolby and G ...
... The purpose of this article is to emphasize the local perspective of each twin in the well known twin paradox who can only do measurements with respect to his/her individual reference frame. This local perspective resembles Bondi’s k-calculus1 or the concept of radar time as discussed by Dolby and G ...
A spectroscopic investigation of the O-type star - ORBi
... evidence of binarity is found can never be definitely considered as single. Even if no RV shift is detected, the system could be seen under a particular orientation, have a very long period or perhaps a high eccentricity, thereby making the RV variations not significant over a long timescale. We per ...
... evidence of binarity is found can never be definitely considered as single. Even if no RV shift is detected, the system could be seen under a particular orientation, have a very long period or perhaps a high eccentricity, thereby making the RV variations not significant over a long timescale. We per ...
PHY216_lect3_2014_sub
... LEFT: The angle at which the rain appears to be falling depends on the speed of the rain and the speed at which the person is running: sin q = vman / vrain. RIGHT: For a star near the ecliptic pole, or for a star in the plane of the ecliptic and at right angles to the direction of motion of the Eart ...
... LEFT: The angle at which the rain appears to be falling depends on the speed of the rain and the speed at which the person is running: sin q = vman / vrain. RIGHT: For a star near the ecliptic pole, or for a star in the plane of the ecliptic and at right angles to the direction of motion of the Eart ...
A brief introduction to the METEORSCATTER-THEORY
... Amateurs have succesfully used MS since many years, for DX contacts in bands ranging from 28 MHz up to 432 MHz. The same mechanism allows radio observers to detect a meteor entering the atmosphere: tuning a radio receiver to a frequency where a known distant transmitter is normally not received, the ...
... Amateurs have succesfully used MS since many years, for DX contacts in bands ranging from 28 MHz up to 432 MHz. The same mechanism allows radio observers to detect a meteor entering the atmosphere: tuning a radio receiver to a frequency where a known distant transmitter is normally not received, the ...
A Perspective from Extinct Radionuclides on a Young
... millimeter- to centimeter-sized, partially crystallized silicate droplets. Coexisting with these chondrules are refractory inclusions (calcium-, aluminum-rich inclusions, or CAIs) that are approximately the same size but differ in their highly refractory chemical compositions. Chondrules and CAIs ar ...
... millimeter- to centimeter-sized, partially crystallized silicate droplets. Coexisting with these chondrules are refractory inclusions (calcium-, aluminum-rich inclusions, or CAIs) that are approximately the same size but differ in their highly refractory chemical compositions. Chondrules and CAIs ar ...
Star formation in a galactic outflow
... illustrated in Fig.3. This result strongly argues in favor of in-situ stellar photoionization, by young stars within the outflow. Even better evidence for stars formed in the outflow is the direct detection of a young stellar population with kinematical fingerprints of formation inside the outflow. ...
... illustrated in Fig.3. This result strongly argues in favor of in-situ stellar photoionization, by young stars within the outflow. Even better evidence for stars formed in the outflow is the direct detection of a young stellar population with kinematical fingerprints of formation inside the outflow. ...
Tidal Venuses: Triggering a Climate Catastrophe via Tidal Heating
... Dole (1964) was the first to point out that terrestrial planets in the HZ of low luminosity stars can have their spin altered by tidal interaction. In particular, the danger of synchronous rotation, i.e. one hemisphere always facing the star, was emphasized. Kasting et al. (1993) quantified this con ...
... Dole (1964) was the first to point out that terrestrial planets in the HZ of low luminosity stars can have their spin altered by tidal interaction. In particular, the danger of synchronous rotation, i.e. one hemisphere always facing the star, was emphasized. Kasting et al. (1993) quantified this con ...
The Reception of the Copernican Revolution
... Copernicus was indeed a scientific revolution in the making. To understand the reasoning behind his embrace of heliocentrism, one must recall Montaigne’s fundamentally skeptical position with respect to the philosophy of knowledge. Montaigne received a humanist education from a very young age. He fo ...
... Copernicus was indeed a scientific revolution in the making. To understand the reasoning behind his embrace of heliocentrism, one must recall Montaigne’s fundamentally skeptical position with respect to the philosophy of knowledge. Montaigne received a humanist education from a very young age. He fo ...
X. Nuclear star clusters in low-mass early-type galaxies
... star clusters; however, they do not predict a relation between host galaxy mass and NSC mass. Antonini (2013) on the other hand contains a comprehensive overview of scaling relations for both formation mechanisms, most of which are analytically derived. One of the few qualitative predictions for the ...
... star clusters; however, they do not predict a relation between host galaxy mass and NSC mass. Antonini (2013) on the other hand contains a comprehensive overview of scaling relations for both formation mechanisms, most of which are analytically derived. One of the few qualitative predictions for the ...
The Kuiper Belt Explored by Serendipitous Stellar Occultations
... The characteristic scale of the Fresnel diffraction effect (i.e., roughly speaking, the broadening of the object shadow) is the so-called Fresnel scale Fs = (λD/2) (Warner, 1988). [Note that some authors give different definitions for the Fresnel scale: (λD/2π) , (λD) , or (λD)/2 .] The Fresnel scal ...
... The characteristic scale of the Fresnel diffraction effect (i.e., roughly speaking, the broadening of the object shadow) is the so-called Fresnel scale Fs = (λD/2) (Warner, 1988). [Note that some authors give different definitions for the Fresnel scale: (λD/2π) , (λD) , or (λD)/2 .] The Fresnel scal ...
Unraveling the Helix Nebula: Its Structure and Knots
... of material, surrounded by a lower ionization outer-ring that is almost perpendicular to the inner-disk. This interpretation is strengthened by its explanation of the complex radial velocity pattern described by radio and optical observations. There is an outer structure called the outermost-ring wh ...
... of material, surrounded by a lower ionization outer-ring that is almost perpendicular to the inner-disk. This interpretation is strengthened by its explanation of the complex radial velocity pattern described by radio and optical observations. There is an outer structure called the outermost-ring wh ...
Digital STARLAB Teachers Guide
... projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capacity to explore a multitude of motions and displays eliminating the need for addition ...
... projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capacity to explore a multitude of motions and displays eliminating the need for addition ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.