Differential rotation on both components of the pre-main
... Cameron 1997) to map the surface brightness distribution of the surfaces of both stars using the Stokes I intensity spectra. The process is described in detail in Paper I and references therein. In Paper I, standard tests were performed to explore the level of crosstalk in the maps of the two stella ...
... Cameron 1997) to map the surface brightness distribution of the surfaces of both stars using the Stokes I intensity spectra. The process is described in detail in Paper I and references therein. In Paper I, standard tests were performed to explore the level of crosstalk in the maps of the two stella ...
Annual Report 2011 - Max Planck Institute for Astrophysics
... Planck Surveyor is a medium-sized ESA satellite mission to map the Cosmic Microwave Background. It was launched in May 2009 and has been operating nominally on station at L2 since late August 2009. ’First light’ was in September 2009. Already in July 2010 the international consortium released the fi ...
... Planck Surveyor is a medium-sized ESA satellite mission to map the Cosmic Microwave Background. It was launched in May 2009 and has been operating nominally on station at L2 since late August 2009. ’First light’ was in September 2009. Already in July 2010 the international consortium released the fi ...
Simplify each expression. Assume that no denominator equals zero
... a. What product has the greatest probability of occurring? b. What is the probability of that product occurring? SOLUTION: a. The possible products are 1, 2, 3, 4, 6, 8, 9, 12, and 16. The only product that can be made by two different sets of numbers is 4 (2 • 2 and 1 • 4). So, 4 is the product ...
... a. What product has the greatest probability of occurring? b. What is the probability of that product occurring? SOLUTION: a. The possible products are 1, 2, 3, 4, 6, 8, 9, 12, and 16. The only product that can be made by two different sets of numbers is 4 (2 • 2 and 1 • 4). So, 4 is the product ...
I N S T
... Utility Features......................................................................................................................................................................................23 GPS On/Off ........................................................................................ ...
... Utility Features......................................................................................................................................................................................23 GPS On/Off ........................................................................................ ...
Observations and Theory of Dynamical Triggers for Star Formation
... M16 (Hester et al. 1996), and M8 (Caulet 1997). Other similar regions have been found in the Sco-Cen association (Bertoldi & Jenkins 1992). Some of these neutral regions may be protostellar disks, as argued in the papers on Orion, but Hester et al. (1996) claims that many are evaporating globules ra ...
... M16 (Hester et al. 1996), and M8 (Caulet 1997). Other similar regions have been found in the Sco-Cen association (Bertoldi & Jenkins 1992). Some of these neutral regions may be protostellar disks, as argued in the papers on Orion, but Hester et al. (1996) claims that many are evaporating globules ra ...
SPICA Yellow Book
... cooled to cryogenic temperatures to achieve high sensitivity and, for most of the frequency range, the observations can only be made from space. Only four small space observatories have operated in the past quarter of a century (IRAS, ISO, Spitzer and AKARI), offering limited spatial resolution and ...
... cooled to cryogenic temperatures to achieve high sensitivity and, for most of the frequency range, the observations can only be made from space. Only four small space observatories have operated in the past quarter of a century (IRAS, ISO, Spitzer and AKARI), offering limited spatial resolution and ...
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, ...
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR
... Where e refers to effective values and n is the Sérsic index. For n=4 it becomes the de Vaucouleurs function; for n=1 an exponential, and when n=0.5, a Gaussian! For values in the range 1-4, approximately, it describes bulges in late-type spiral galaxies (or pseudo-bulges) to bulges in early-type sp ...
... Where e refers to effective values and n is the Sérsic index. For n=4 it becomes the de Vaucouleurs function; for n=1 an exponential, and when n=0.5, a Gaussian! For values in the range 1-4, approximately, it describes bulges in late-type spiral galaxies (or pseudo-bulges) to bulges in early-type sp ...
Mapping the Pathways of Galaxy Transformation Across Time and
... Is “quenching” the termination of star formation or the compression of star formation histories (SFHs)? I discuss the deep implications this reframing has for what we see as and how we study core processes shaping galaxy life-cycles. As a lens, I use two outcomes from the IMACS Cluster-Building Surv ...
... Is “quenching” the termination of star formation or the compression of star formation histories (SFHs)? I discuss the deep implications this reframing has for what we see as and how we study core processes shaping galaxy life-cycles. As a lens, I use two outcomes from the IMACS Cluster-Building Surv ...
Properties of White Dwarfs, Teacher Guide
... relative to our Sun. There are two motions that can be measured: radial velocity (in the line of sight) measured through spectroscopy and tangential velocity (perpendicular to the line of sight). Tangential velocity is obtained from knowing the star's distance and “proper motion” (motion across the ...
... relative to our Sun. There are two motions that can be measured: radial velocity (in the line of sight) measured through spectroscopy and tangential velocity (perpendicular to the line of sight). Tangential velocity is obtained from knowing the star's distance and “proper motion” (motion across the ...
probing quasar environments with tunable filter
... During this project, I have benefited enormously from the input of not just one but two supervisors. First, many thanks are due to Joanne Baker for getting the whole thing started. Isobel Hook was generous (or foolish!) enough to take over part of the way through: her insights and advice were invalu ...
... During this project, I have benefited enormously from the input of not just one but two supervisors. First, many thanks are due to Joanne Baker for getting the whole thing started. Isobel Hook was generous (or foolish!) enough to take over part of the way through: her insights and advice were invalu ...
Maximizing the ExoEarth Candidate Yield from a Future Direct
... NASA Goddard Space Flight Center, Exoplanets & Stellar Astrophysics Laboratory, Code 667, Greenbelt, MD 20771; [email protected] ...
... NASA Goddard Space Flight Center, Exoplanets & Stellar Astrophysics Laboratory, Code 667, Greenbelt, MD 20771; [email protected] ...
Astronomy Astrophysics - Niels Bohr Institutet
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
Tuomas Kangas
... A detailed examination of the properties and internal physics of stars is well beyond the scope of this thesis. However, the basic terminology and evolutionary sequence are essential for understanding SNe and their progenitor stars. This brief chapter is based on the book Stellar Structure and Evolu ...
... A detailed examination of the properties and internal physics of stars is well beyond the scope of this thesis. However, the basic terminology and evolutionary sequence are essential for understanding SNe and their progenitor stars. This brief chapter is based on the book Stellar Structure and Evolu ...
TOSS-UP 7) ASTRONOMY Short Answer
... Ancient cultures saw patterns in the heavens that resembled people, animals or common objects — constellations that came to represent figures from myth, such as Orion the Hunter, a hero in Greek mythology. Astronomers now often use constellations in the naming of stars. The International Astronomica ...
... Ancient cultures saw patterns in the heavens that resembled people, animals or common objects — constellations that came to represent figures from myth, such as Orion the Hunter, a hero in Greek mythology. Astronomers now often use constellations in the naming of stars. The International Astronomica ...
6.7 GHz Methanol Masers and the GBT
... Methanol masers at 6.7 GHz • Since these methanol masers are often not associated with infrared emission, they are best discovered using blind surveys. • To date, there have been only around four blind surveys carried out to detect 6.7 GHz methanol masers. • Most of the other surveys are targeted t ...
... Methanol masers at 6.7 GHz • Since these methanol masers are often not associated with infrared emission, they are best discovered using blind surveys. • To date, there have been only around four blind surveys carried out to detect 6.7 GHz methanol masers. • Most of the other surveys are targeted t ...
environmental effects on galaxy evolution in nearby clusters
... The observational evidences presented in this work suggest that: (I) Giant ellipticals are an old, homogeneous population showing no or little evolution at least in the past 8 Gyr; unlike dwarf ellipticals which still contain young stellar populations. (II) The importance of different environmental ...
... The observational evidences presented in this work suggest that: (I) Giant ellipticals are an old, homogeneous population showing no or little evolution at least in the past 8 Gyr; unlike dwarf ellipticals which still contain young stellar populations. (II) The importance of different environmental ...
Science with the Constellation
... the microwave background. The Next Generation Space Telescope (NGST) will zoom in on the first galaxies as they appear at high redshift. At intermediate redshift, Constellation-X and NGST will study the evolution of AGN and starburst galaxies. In addition, Constellation-X will also address fundament ...
... the microwave background. The Next Generation Space Telescope (NGST) will zoom in on the first galaxies as they appear at high redshift. At intermediate redshift, Constellation-X and NGST will study the evolution of AGN and starburst galaxies. In addition, Constellation-X will also address fundament ...
Article PDF - IOPscience
... A major problem in extragalactic astronomy is the inability to distinguish in a robust, physical, and modelindependent way how galaxy populations are physically related to each other and to their formation histories. A similar, but distinct, and also long-standing question is whether the structural ...
... A major problem in extragalactic astronomy is the inability to distinguish in a robust, physical, and modelindependent way how galaxy populations are physically related to each other and to their formation histories. A similar, but distinct, and also long-standing question is whether the structural ...
A Variability Study of the Typical Red Supergiant Antares A
... the exception of the bright M-class supergiant Betelgeuse (α Orionis, M2 Iab). Betelgeuse has been well studied both observationally and theoretically, and has many features that are well described by models of convection. It was these studies of Betelgeuse that provided the main motivation for this ...
... the exception of the bright M-class supergiant Betelgeuse (α Orionis, M2 Iab). Betelgeuse has been well studied both observationally and theoretically, and has many features that are well described by models of convection. It was these studies of Betelgeuse that provided the main motivation for this ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.