1 - Piscataway High School
... enough, helium fusion begins to make energy, and the temperature rises, but pressure does not increase because the gas is degenerate. The higher temperature increases the helium fusion even further, and the result is a runaway explosion called the helium flash in which, for a few minutes, the core o ...
... enough, helium fusion begins to make energy, and the temperature rises, but pressure does not increase because the gas is degenerate. The higher temperature increases the helium fusion even further, and the result is a runaway explosion called the helium flash in which, for a few minutes, the core o ...
Chromospherically young, kinematically old stars
... Depart. of Astronomy, University of Virginia, Charlottesville, VA 22903, USA e-mail: [email protected] ...
... Depart. of Astronomy, University of Virginia, Charlottesville, VA 22903, USA e-mail: [email protected] ...
The Classification of Stellar Spectra
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
The DBV stars: Progress and problems
... While it is possible that most or all of the cooler (Teff < 20,000 K) DA white dwarfs are the spawn of hydrogen-rich planetary nebula nuclei, the picture is less certain for the DBV and DB ’whitedwarfs. There are at least two possible progenitors of DB white dwarfs: the PG 1159 stars and the interac ...
... While it is possible that most or all of the cooler (Teff < 20,000 K) DA white dwarfs are the spawn of hydrogen-rich planetary nebula nuclei, the picture is less certain for the DBV and DB ’whitedwarfs. There are at least two possible progenitors of DB white dwarfs: the PG 1159 stars and the interac ...
What To See Telescope(Jul-Sept) v1 - One
... constellation takes its name from the classical mythological figure of the same name. The hero is depicted in the sky kneeling, praying to Zeus for strength to finish his legendary great labors. The constellation is home to an extremely distant supercluster of galaxies, most of which are beyond the ...
... constellation takes its name from the classical mythological figure of the same name. The hero is depicted in the sky kneeling, praying to Zeus for strength to finish his legendary great labors. The constellation is home to an extremely distant supercluster of galaxies, most of which are beyond the ...
Activity III: Calibrating Images
... just that it remains constant. For images of objects beyond our own galaxy, foreground stars are typically chosen. These are stars within our galaxy that are in the same line of sight to the further away object. If the observing conditions did not change from one night to the next, the reference sta ...
... just that it remains constant. For images of objects beyond our own galaxy, foreground stars are typically chosen. These are stars within our galaxy that are in the same line of sight to the further away object. If the observing conditions did not change from one night to the next, the reference sta ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... we obtained two series of different exposure times in each filter to achieve accurate photometry for a broad magnitude range. The central position for the cluster and the exposure times are presented in Table 1. Standard stars were observed the same night in the clusters NGC 869, NGC 884, NGC 6910, a ...
... we obtained two series of different exposure times in each filter to achieve accurate photometry for a broad magnitude range. The central position for the cluster and the exposure times are presented in Table 1. Standard stars were observed the same night in the clusters NGC 869, NGC 884, NGC 6910, a ...
The Classification of Stellar Spectra
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
Stargazing For Beginners: A Binocular Tour of the Southern Night Sky
... Choosing Binoculars for Stargazing Why Binoculars ? A century ago, many casual stargazers explored the night sky with an “opera glass”, a pair of small side-by-side telescopes used to get close-up views of indoor events. These were simple instruments by today’s standards. The objective lenses of an ...
... Choosing Binoculars for Stargazing Why Binoculars ? A century ago, many casual stargazers explored the night sky with an “opera glass”, a pair of small side-by-side telescopes used to get close-up views of indoor events. These were simple instruments by today’s standards. The objective lenses of an ...
A History of Star Catalogues - The Albuquerque Astronomical Society
... catalogue was a means to this end. Using Tycho’s measurements, Kepler was able to formulate his three laws. (Kusukawa 1999) ...
... catalogue was a means to this end. Using Tycho’s measurements, Kepler was able to formulate his three laws. (Kusukawa 1999) ...
Evolved, single, slowly rotating... but magnetically active
... duplicity, and yet the star shows strong magnetic activity when compared with the empirical rotation versus activity relation of other cool giants, including the RS CVn binaries (Strassmeier et al. 1990, 1994). HR 1362 has recently been detected as an extreme ultraviolet source by EUVE (Lampton et a ...
... duplicity, and yet the star shows strong magnetic activity when compared with the empirical rotation versus activity relation of other cool giants, including the RS CVn binaries (Strassmeier et al. 1990, 1994). HR 1362 has recently been detected as an extreme ultraviolet source by EUVE (Lampton et a ...
Late Summer Messier Objects
... In addition, they are well-placed only during the summer, when the nights are at their shortest and the logistics of observing are most problematic. But they are not quite as bad in this regard as the objects between RA 15 and RA 18, at least not for people who do most of their observing in the even ...
... In addition, they are well-placed only during the summer, when the nights are at their shortest and the logistics of observing are most problematic. But they are not quite as bad in this regard as the objects between RA 15 and RA 18, at least not for people who do most of their observing in the even ...
Part IV: Stars
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
... 3. THE RR LYRAE STARS IN M15 In Clement’s (2002) data base of variables stars, a total of 158 variable stars are known, from which approximately 104 are RR Lyrae type stars. In this work, 33 known RR Lyrae stars, identified in Figs. 1 and 2 and listed in Table 4, have been studied. For all the stars ...
The Classification of Stellar Spectra
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
Marking Scheme of Observational Sessions
... observer can mark those Deep Sky Objects ( IF THEY CAN BE SEEN IN NAKED EYE ) by using standard symbols . Eg : - Observer can mark Orion nebula (by a Symbol) in its position ( at the constellation of “Orion”) in his/her constellation mapping drawing. But drawing Orion nebula IS NOT ACCEPTABLE ! Maxi ...
... observer can mark those Deep Sky Objects ( IF THEY CAN BE SEEN IN NAKED EYE ) by using standard symbols . Eg : - Observer can mark Orion nebula (by a Symbol) in its position ( at the constellation of “Orion”) in his/her constellation mapping drawing. But drawing Orion nebula IS NOT ACCEPTABLE ! Maxi ...
Star 1 A star is a massive, luminous ball of plasma held together by
... hundreds of thousands of stars located one billion light years away[37] —ten times the distance of the most distant star cluster previously observed. ...
... hundreds of thousands of stars located one billion light years away[37] —ten times the distance of the most distant star cluster previously observed. ...
Globular Clusters
... ω Centauri, the biggest Galactic GC, barely visible in the southern hemisphere. The first ‘astronomical’ detection dates back to the 18th century. John Herschel, in the 1830s, realized that a large number of these clusters are concentrated in a relatively small portion of the sky in the direction of ...
... ω Centauri, the biggest Galactic GC, barely visible in the southern hemisphere. The first ‘astronomical’ detection dates back to the 18th century. John Herschel, in the 1830s, realized that a large number of these clusters are concentrated in a relatively small portion of the sky in the direction of ...
The Stars - Springer
... Many stars are variable so the value for the apparent magnitude will change. Any variable will have the suffix v, and the value given will be the mean value. ...
... Many stars are variable so the value for the apparent magnitude will change. Any variable will have the suffix v, and the value given will be the mean value. ...
On the nature and detectability of Type Ib/c supernova progenitors
... rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface temperatures of log T ≃ 4.8, and Maund et al. applied their BCs accordingly only up to the quoted value. However, the stellar t ...
... rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface temperatures of log T ≃ 4.8, and Maund et al. applied their BCs accordingly only up to the quoted value. However, the stellar t ...
Colloquial Jakartan Indonesian
... record their navigational strategies. His resulting book, We, the Navigators (1972),2 is the most complete record we are likely to get of this body of knowledge, rapidly disappearing with the increased presence of motorised boats and Western navigational technology. He was also at pains to record, i ...
... record their navigational strategies. His resulting book, We, the Navigators (1972),2 is the most complete record we are likely to get of this body of knowledge, rapidly disappearing with the increased presence of motorised boats and Western navigational technology. He was also at pains to record, i ...
11-Massive Stars
... Molecular bipolar outflows are a basic component of all young massive protostars. Compared to their low mass counterparts, outflows from young massive protostar are much more energetic. Furthermore, massive molecular outflows are observed on large spatial scales (in the parsec range). Therefore, the ...
... Molecular bipolar outflows are a basic component of all young massive protostars. Compared to their low mass counterparts, outflows from young massive protostar are much more energetic. Furthermore, massive molecular outflows are observed on large spatial scales (in the parsec range). Therefore, the ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.