An introduction to photometry and photometric measurements Henry
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
The accretion disk paradigm for young stars
... whereas the observed excess luminosity can be greater than L in extreme CTTSs. Even though the value of a typical CTTS luminosity excess was unknown in the early 1950s, it was already clear that it was orders of magnitude larger than what the accretion of interstellar cloud gas could provide. Faced ...
... whereas the observed excess luminosity can be greater than L in extreme CTTSs. Even though the value of a typical CTTS luminosity excess was unknown in the early 1950s, it was already clear that it was orders of magnitude larger than what the accretion of interstellar cloud gas could provide. Faced ...
arXiv:astro-ph/0508448v1 22 Aug 2005
... that is, that the distribution of parameters which produce WR evolution in the secondary1 and the distribution of parameters which produce an asymmetric SN explosion which unbinds the system are completely unrelated. In reality this is unlikely to be the case. The likelihood of a system producing a ...
... that is, that the distribution of parameters which produce WR evolution in the secondary1 and the distribution of parameters which produce an asymmetric SN explosion which unbinds the system are completely unrelated. In reality this is unlikely to be the case. The likelihood of a system producing a ...
The High Resolution Camera CXC Newsletter
... and activity periods). 129 sources could be classified as X-ray binaries due to their position in globular clusters or their strong time variability (see Fig. 2). We detected seven supernova remnants, one of which is a new candidate, and also resolved the first X-rays from a known radio supernova re ...
... and activity periods). 129 sources could be classified as X-ray binaries due to their position in globular clusters or their strong time variability (see Fig. 2). We detected seven supernova remnants, one of which is a new candidate, and also resolved the first X-rays from a known radio supernova re ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... It is often helpful to know when these phenomena actually took place; and in some cases, such as Ovid’s Fasti, it can inform both textual and literary criticism. In the Fasti Ovid provides over forty dates for the rising and setting of various stars and constellations, following the tradition of the ...
... It is often helpful to know when these phenomena actually took place; and in some cases, such as Ovid’s Fasti, it can inform both textual and literary criticism. In the Fasti Ovid provides over forty dates for the rising and setting of various stars and constellations, following the tradition of the ...
instructor notes stellar evolution, star clusters
... individual evolutionary tracks for stars of different mass change slope as the dominant method of energy escape for the star changes. The evolutionary tracks for massive stars quickly become radiative, following which they trace out tracks of rapidly increasing stellar temperature in the H-R diagram ...
... individual evolutionary tracks for stars of different mass change slope as the dominant method of energy escape for the star changes. The evolutionary tracks for massive stars quickly become radiative, following which they trace out tracks of rapidly increasing stellar temperature in the H-R diagram ...
instructor notes stellar evolution, star clusters
... individual evolutionary tracks for stars of different mass change slope as the dominant method of energy escape for the star changes. The evolutionary tracks for massive stars quickly become radiative, following which they trace out tracks of rapidly increasing stellar temperature in the H-R diagram ...
... individual evolutionary tracks for stars of different mass change slope as the dominant method of energy escape for the star changes. The evolutionary tracks for massive stars quickly become radiative, following which they trace out tracks of rapidly increasing stellar temperature in the H-R diagram ...
Title: Binary interaction dominates the evolution of massive stars
... naturally result in the formation of binary systems containing two massive stars with similar but not equal masses (i.e., within a factor of a few). Albeit the companions are initially formed in a wide orbit, dynamical interactions with the remnant accretion disk may significantly harden the system, ...
... naturally result in the formation of binary systems containing two massive stars with similar but not equal masses (i.e., within a factor of a few). Albeit the companions are initially formed in a wide orbit, dynamical interactions with the remnant accretion disk may significantly harden the system, ...
2 The Concept of “Spectral Classes”
... groups of like stars without making explicit searches by star name one at a time or by cross correlation of established catalogs. In fact, this is one of the most common requests the Multi-Mission Archive at the Space Telescope Science Institute (MAST) receives. The IUE satellite project, with the F ...
... groups of like stars without making explicit searches by star name one at a time or by cross correlation of established catalogs. In fact, this is one of the most common requests the Multi-Mission Archive at the Space Telescope Science Institute (MAST) receives. The IUE satellite project, with the F ...
Chapter 12: Stars and Galaxies
... The Sun is medium sized with a surface temperature of about 5,800 K. Supergiants, the largest stars, are as big as the orbits of our outer planets. Red giant stars began with a mass and a diameter similar to those of our Sun, but later expanded to be 10–100 times larger. Eventually, our Sun will exp ...
... The Sun is medium sized with a surface temperature of about 5,800 K. Supergiants, the largest stars, are as big as the orbits of our outer planets. Red giant stars began with a mass and a diameter similar to those of our Sun, but later expanded to be 10–100 times larger. Eventually, our Sun will exp ...
Surface Gravity as a Diagnostic ... Youth Cameron Higby-Naquin Advisor: Eric Jensen
... Knowing the age of a star is only the first step to understanding stellar evolution and completely describing how stars change with time. In short, different stars take different amounts of time to form, and to fully grasp the formation process, physical properties of the star must be determined. A ...
... Knowing the age of a star is only the first step to understanding stellar evolution and completely describing how stars change with time. In short, different stars take different amounts of time to form, and to fully grasp the formation process, physical properties of the star must be determined. A ...
Globular Clusters
... isochrones (transformed into the observational plane) with the observed CMD is the key procedure to obtain information on the evolutionary status of GC stars. The main sequence and the turn-off After a free-fall phase, the gravitational contraction leads the proto-star to increase its central temper ...
... isochrones (transformed into the observational plane) with the observed CMD is the key procedure to obtain information on the evolutionary status of GC stars. The main sequence and the turn-off After a free-fall phase, the gravitational contraction leads the proto-star to increase its central temper ...
CONSTELLATION PERSEUS The constellation
... away from Earth, Mirfak has 5,000 times the luminosity and 42 times the diameter of our Sun. It is the brightest member of the Alpha Persei Cluster, an open cluster containing many luminous stars. • Zeta Persei is the third-brightest star in the constellation at magnitude 2.86. Around 750 light-year ...
... away from Earth, Mirfak has 5,000 times the luminosity and 42 times the diameter of our Sun. It is the brightest member of the Alpha Persei Cluster, an open cluster containing many luminous stars. • Zeta Persei is the third-brightest star in the constellation at magnitude 2.86. Around 750 light-year ...
ppt - SLAC
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
Alpha Centauri
... FAMOUS FOR: It’s the 3rd brightest star in the sky. And a member of the triple star system. ...
... FAMOUS FOR: It’s the 3rd brightest star in the sky. And a member of the triple star system. ...
