as PDF - Minnesota Academy of Science
... the division of the tail, on its axis, was even more marked than in this. The comet of 1858 was the most remarkable one of modern times, if comet b. of 1881 be excepted. Between February 27 ahd 28, it was only five hundred and thirty-eight thoueand miles from the Sun's surface, about twice the dista ...
... the division of the tail, on its axis, was even more marked than in this. The comet of 1858 was the most remarkable one of modern times, if comet b. of 1881 be excepted. Between February 27 ahd 28, it was only five hundred and thirty-eight thoueand miles from the Sun's surface, about twice the dista ...
harlow shapley - National Academy of Sciences
... the truly great are indeed happy fellows; second, men and women of accomplishment have an obligation to search out the best young people that come their way and assist them in every possible way in shaping their careers. During his Princeton days, Harlow Shapley studied the cepheid variable stars, w ...
... the truly great are indeed happy fellows; second, men and women of accomplishment have an obligation to search out the best young people that come their way and assist them in every possible way in shaping their careers. During his Princeton days, Harlow Shapley studied the cepheid variable stars, w ...
Differential rotation in Sun-like stars from surface variability and
... from the stellar surface and corona. Stars on the PMS are also magnetically active, and so are expected to have stellar winds. The torque by a stellar wind must be proportional to the rotation rate of the star and the mass-loss rate through a sphere of radius equivalent to the Alfvén radius. Many mo ...
... from the stellar surface and corona. Stars on the PMS are also magnetically active, and so are expected to have stellar winds. The torque by a stellar wind must be proportional to the rotation rate of the star and the mass-loss rate through a sphere of radius equivalent to the Alfvén radius. Many mo ...
The physics of line-driven winds of hot massive stars
... see in her or his life. One is overwhelmed by the immensity of our galaxy (see Figure 1.1), and is intrigued by the presence of two of its satellites, the Large and Small Magellanic Cloud. Galaxies are comprised of stars and clouds of gas. Stars that appear equally bright to the naked eye may either ...
... see in her or his life. One is overwhelmed by the immensity of our galaxy (see Figure 1.1), and is intrigued by the presence of two of its satellites, the Large and Small Magellanic Cloud. Galaxies are comprised of stars and clouds of gas. Stars that appear equally bright to the naked eye may either ...
Worlds Beyond: A Strategy for the Detection and Characterization of
... planets”) using ground-based and space assets in place or under development today, and the second with the ultimate goal of detecting and characterizing Earth-size/Earth-mass planets around stars like our Sun with new capabilities whose technologies are under development today (Fig. 5). The first of ...
... planets”) using ground-based and space assets in place or under development today, and the second with the ultimate goal of detecting and characterizing Earth-size/Earth-mass planets around stars like our Sun with new capabilities whose technologies are under development today (Fig. 5). The first of ...
The visibility of Lyman Alpha Emitters: constraining reionization
... Lyα photons that emerge out of a galaxy are transmitted through the IGM and reach the observer. As expected, this transmission sensitively depends on the IGM H I ionization state and it has been shown that only galaxies residing in over-lapping H II regions would be observed as LAEs in the initial s ...
... Lyα photons that emerge out of a galaxy are transmitted through the IGM and reach the observer. As expected, this transmission sensitively depends on the IGM H I ionization state and it has been shown that only galaxies residing in over-lapping H II regions would be observed as LAEs in the initial s ...
Stellar Intensity Interferometry: The Background John Davis Sydney Institute for Astronomy
... and Cassiopeia A, were unknown and some thought they were “radio stars”. Robert Hanbury Brown (RHB) was determined to measure them • If these sources were galaxies their angular sizes would be of the order of a minute of arc and easy to measure with a conventional interferometer but, if they were s ...
... and Cassiopeia A, were unknown and some thought they were “radio stars”. Robert Hanbury Brown (RHB) was determined to measure them • If these sources were galaxies their angular sizes would be of the order of a minute of arc and easy to measure with a conventional interferometer but, if they were s ...
Evolution of the Milky Way with radial motions of stars and gas
... such coefficients from the simulation of an early-type barred disk and, applying them in a semi-analytical model of that same disk, they showed that all the main features of the N-body+SPH simulation can be reproduced to a good accuracy. They also showed that radial migration moves around not only “pa ...
... such coefficients from the simulation of an early-type barred disk and, applying them in a semi-analytical model of that same disk, they showed that all the main features of the N-body+SPH simulation can be reproduced to a good accuracy. They also showed that radial migration moves around not only “pa ...
OBSERVATIONS OF PHYSICAL PROCESSES IN
... the BCG is still located near the X-ray peak and the metallicity is still centrally peaked, which suggests sloshing is a recent phenomenon. Also, we do not find X-ray cavitites even though they are expected in a cool core with radio emission. We simulate X-ray images with various bubble configurati ...
... the BCG is still located near the X-ray peak and the metallicity is still centrally peaked, which suggests sloshing is a recent phenomenon. Also, we do not find X-ray cavitites even though they are expected in a cool core with radio emission. We simulate X-ray images with various bubble configurati ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... hereafter discuss the CO luminosity function. Since earlier work in the Galaxy or in external galaxies uses a constant N(H2 )/ICO factor, the functions are directly comparable. A large sample is necessary to fit a mass function (Maschberger & Kroupa 2009); we identified 337 molecular clouds in M 33, ...
... hereafter discuss the CO luminosity function. Since earlier work in the Galaxy or in external galaxies uses a constant N(H2 )/ICO factor, the functions are directly comparable. A large sample is necessary to fit a mass function (Maschberger & Kroupa 2009); we identified 337 molecular clouds in M 33, ...
1 Globular Cluster Systems - McMaster Physics and Astronomy
... Individual globular clusters have been known for at least two centuries. Is our census of them complete, or are we still missing some? This question has been asked many times, and attempted answers have di ered quite a bit (e.g. Racine & Harris 1989; Arp 1965; Sharov 1976; Oort 1977; Barbuy et al. 1 ...
... Individual globular clusters have been known for at least two centuries. Is our census of them complete, or are we still missing some? This question has been asked many times, and attempted answers have di ered quite a bit (e.g. Racine & Harris 1989; Arp 1965; Sharov 1976; Oort 1977; Barbuy et al. 1 ...
Jul y 10-12,
... IGR J17091-3624 is a black hole system which has very recently attracted the interest in the scientific community as it is the first system to show some of the bizarre, high-amplitude, highly-structured X-ray variability only seen before in the extremely energetic black hole system GRS 1915+105. In ...
... IGR J17091-3624 is a black hole system which has very recently attracted the interest in the scientific community as it is the first system to show some of the bizarre, high-amplitude, highly-structured X-ray variability only seen before in the extremely energetic black hole system GRS 1915+105. In ...
The ALMA Universe - ALMA Observatory
... mysteries about the formation of planets and the appearance of complex molecules, including organic molecules. ...
... mysteries about the formation of planets and the appearance of complex molecules, including organic molecules. ...
Omni XLT Manual - Celestron.UK.COM
... The Omni XLT deluxe features combined with Celestron’s legendary optical systems give amateur astronomers the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few ob ...
... The Omni XLT deluxe features combined with Celestron’s legendary optical systems give amateur astronomers the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few ob ...
W.M. Keck Observatory Annual Report 2009
... hosting a super-Earth of five and 7.5 times that of our planet’s mass, respectively. Separately, Andrew Howard and Geoff Marcy, both of the University of California, Berkeley, and colleagues identified an exoplanet with a mass just four times that of Earth orbiting its parent star HD 156668. It is t ...
... hosting a super-Earth of five and 7.5 times that of our planet’s mass, respectively. Separately, Andrew Howard and Geoff Marcy, both of the University of California, Berkeley, and colleagues identified an exoplanet with a mass just four times that of Earth orbiting its parent star HD 156668. It is t ...
Giant star seismology
... Here we provide an overview of the internal structures of low- to intermediate-mass stars (roughly 0.8 to 10 M⊙ ) in their respective evolutionary stages. We discuss the low-mass stars and intermediate-mass stars separately. Low-mass stars are those stars that ignite helium in the core under degener ...
... Here we provide an overview of the internal structures of low- to intermediate-mass stars (roughly 0.8 to 10 M⊙ ) in their respective evolutionary stages. We discuss the low-mass stars and intermediate-mass stars separately. Low-mass stars are those stars that ignite helium in the core under degener ...
The Star of Bethlehem
... prejudices about what kind of heavenly phenomenon would have been sufficiently worthy of indicating a Messianic birth. These prejudices are sufficiently powerful in themselves to make a clear view of the textual evidence impossible and to prevent a solution to the problem. One of the reasons why the ...
... prejudices about what kind of heavenly phenomenon would have been sufficiently worthy of indicating a Messianic birth. These prejudices are sufficiently powerful in themselves to make a clear view of the textual evidence impossible and to prevent a solution to the problem. One of the reasons why the ...
A Universal Stellar Initial Mass Function? A Critical Look Further
... Way! Elmegreen & Scalo (2006) provide a detailed exploration of the degeneracies involved in inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the plac ...
... Way! Elmegreen & Scalo (2006) provide a detailed exploration of the degeneracies involved in inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the plac ...
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.