The Norma cluster (ACO3627) – II. The near-infrared Ks
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
Chemical analysis of 24 dusty (pre-) main
... Herbig Ae/Be (HAEBE) stars are generally thought to be the somewhat more massive analogues of the T Tauri stars, which are low-mass pre-main-sequence stars. They were first defined as a class in 1960 by Herbig, based on three observational criteria: the stars have spectral type A or earlier, display ...
... Herbig Ae/Be (HAEBE) stars are generally thought to be the somewhat more massive analogues of the T Tauri stars, which are low-mass pre-main-sequence stars. They were first defined as a class in 1960 by Herbig, based on three observational criteria: the stars have spectral type A or earlier, display ...
Cassiopeia Kelly Pearce
... that the hundreds or even thousands of objects within it formed at the same time, from the same nebulae (Gater & Vamplew, 2010, p.88). There is one object within the NGC 457 that is not a part of the open cluster and is actually a red giant that is approximately 6,700 light-years closer than the rem ...
... that the hundreds or even thousands of objects within it formed at the same time, from the same nebulae (Gater & Vamplew, 2010, p.88). There is one object within the NGC 457 that is not a part of the open cluster and is actually a red giant that is approximately 6,700 light-years closer than the rem ...
Chapter 1 The Discovery of Open Clusters - Willmann-Bell
... maidens who were being pursued by bears. The maidens were subsequently placed in the sky as the Pleiades cluster. These stars were also important in the world system of the peoples of Mexico and Central America. The west face of the Great Pyramid of the Sun at Teotihuacan is oriented towards the set ...
... maidens who were being pursued by bears. The maidens were subsequently placed in the sky as the Pleiades cluster. These stars were also important in the world system of the peoples of Mexico and Central America. The west face of the Great Pyramid of the Sun at Teotihuacan is oriented towards the set ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... Table 1 we give the number of stars for each of the subsamples. Since we wanted to derive how the stellar density varies with the galactocentric distance, we needed to ensure that the features observed are due to a physical and real overdensity and not to observational or selection biases. To accoun ...
... Table 1 we give the number of stars for each of the subsamples. Since we wanted to derive how the stellar density varies with the galactocentric distance, we needed to ensure that the features observed are due to a physical and real overdensity and not to observational or selection biases. To accoun ...
Distance determination for RAVE stars using stellar models
... The future prospects for distance determinations are very promising. In the next decade the Gaia satellite (Perryman et al. 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the ...
... The future prospects for distance determinations are very promising. In the next decade the Gaia satellite (Perryman et al. 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the ...
Far-ultraviolet and far-infrared bivariate luminosity function of galaxies:
... Another benefit of the copula is that it is easy to incorporate observational selection effects which always exist in any kind of astronomical data. In a bi(multi)variate analysis, there are two categories of observational selection effects: ...
... Another benefit of the copula is that it is easy to incorporate observational selection effects which always exist in any kind of astronomical data. In a bi(multi)variate analysis, there are two categories of observational selection effects: ...
CPW
... • RaAonale: This is a rare science quesAon on which you are required to use a bit of outside knowledge. • The last sentence of Student 2’s second paragraph states that Algol B came into co ...
... • RaAonale: This is a rare science quesAon on which you are required to use a bit of outside knowledge. • The last sentence of Student 2’s second paragraph states that Algol B came into co ...
thick disk - asteroSTEP
... galaxies) vary from satellite to satellite, and are different in detail from the more homogeneous overall properties of the disk stars. We can think of a chemical space of abundances of elements O, Na, Mg, Al, Ca, Mn, Fe, Cu, Sr, Ba, Eu for example. The dimensionality of this space is between about ...
... galaxies) vary from satellite to satellite, and are different in detail from the more homogeneous overall properties of the disk stars. We can think of a chemical space of abundances of elements O, Na, Mg, Al, Ca, Mn, Fe, Cu, Sr, Ba, Eu for example. The dimensionality of this space is between about ...
Star formation rates and efficiencies in the Galactic Centre
... most importantly and urgently, by their dependence on ill-constrained free parameters. The lack of empirical constraints on these parameters therefore represents a key challenge in the further verification or falsification of current star formation theories. Key words: stars: formation−ISM: clouds−I ...
... most importantly and urgently, by their dependence on ill-constrained free parameters. The lack of empirical constraints on these parameters therefore represents a key challenge in the further verification or falsification of current star formation theories. Key words: stars: formation−ISM: clouds−I ...
Binarity in carbon-enhanced metal-poor stars
... for instance, Ito et al. 2013; Norris et al. 2013b). It has also been suggested that in very low metallicity AGB stars with very high neutron-to-Fe-peak-element seed ratios, the s-process runs to completion and a large overabundance of Pb is produced instead of Ba (Busso, Gallino & Wasserburg 1999; ...
... for instance, Ito et al. 2013; Norris et al. 2013b). It has also been suggested that in very low metallicity AGB stars with very high neutron-to-Fe-peak-element seed ratios, the s-process runs to completion and a large overabundance of Pb is produced instead of Ba (Busso, Gallino & Wasserburg 1999; ...
Galaxies Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
WHAT MAKES A STAR SO SPECIAL Abstract
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
Open clusters and associations in the Gaia era
... an issue if the survey does not extend beyond the cluster tidal radius, especially if there is mass segregation as the incompleteness level will then depend on mass. Moreover, objects might be missed around bright stars due to contrast issue, in crowded regions or in area with high extinction. As fo ...
... an issue if the survey does not extend beyond the cluster tidal radius, especially if there is mass segregation as the incompleteness level will then depend on mass. Moreover, objects might be missed around bright stars due to contrast issue, in crowded regions or in area with high extinction. As fo ...
1998 - Universitäts-Sternwarte München
... a far-reaching alert to closed box models or other simplified assumptions, in spite of their analytical beauties. Similarly, the system of Galactic globular clusters has been found to be mixed with some foreign intruders, which can alter our notions of, for instance, the instrinsic age spread of the ...
... a far-reaching alert to closed box models or other simplified assumptions, in spite of their analytical beauties. Similarly, the system of Galactic globular clusters has been found to be mixed with some foreign intruders, which can alter our notions of, for instance, the instrinsic age spread of the ...
Quiescent and flaring X-ray emission from the nearby M/T dwarf
... is unresolved in the XMM detectors, but the X-ray emission is very likely from the M 8.5 dwarf. We compare its flaring emission to those of similar very low mass stars and additionally present an XMM observation of the M 8 dwarf VB 10. Results. We detect quasi-quiescent X-ray emission from SCR 1845- ...
... is unresolved in the XMM detectors, but the X-ray emission is very likely from the M 8.5 dwarf. We compare its flaring emission to those of similar very low mass stars and additionally present an XMM observation of the M 8 dwarf VB 10. Results. We detect quasi-quiescent X-ray emission from SCR 1845- ...
21 -26 August University of Exeter
... Investigating the dynamics of the interstellar medium (ISM) is key to gaining insight into the formation of starforming filaments in molecular clouds (MCs). A plethora of numerical and analytical models associate the origin of this filamentary structure to the interplay between self-gravity and magn ...
... Investigating the dynamics of the interstellar medium (ISM) is key to gaining insight into the formation of starforming filaments in molecular clouds (MCs). A plethora of numerical and analytical models associate the origin of this filamentary structure to the interplay between self-gravity and magn ...
Non-thermal hard X-ray emission from stellar coronae
... solids ⇒ planetary formation in dead zones only? When formed, planetesimals undergo random walks, rather than simple migration Close-in gaseous planets have magnetosphere which interact with the stellar one ⇒ enhanced activity Planet atmospheres are subject to high-energy irradiation and stellar win ...
... solids ⇒ planetary formation in dead zones only? When formed, planetesimals undergo random walks, rather than simple migration Close-in gaseous planets have magnetosphere which interact with the stellar one ⇒ enhanced activity Planet atmospheres are subject to high-energy irradiation and stellar win ...
Rotation Periods of Wide Binaries in the Kepler Field
... stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that some stars exhibited large deviations from the mean relation. Mamajek & Hillenbrand (2008), compar ...
... stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that some stars exhibited large deviations from the mean relation. Mamajek & Hillenbrand (2008), compar ...
astro-ph/0301519 PDF
... We find that the presence or absence of heavy elements in the hot DA white dwarfs largely reflects what would be expected if radiative levitation is the supporting mechanism, although the measured abundances do not match the predicted values very well, as reported by other authors in the past. Almos ...
... We find that the presence or absence of heavy elements in the hot DA white dwarfs largely reflects what would be expected if radiative levitation is the supporting mechanism, although the measured abundances do not match the predicted values very well, as reported by other authors in the past. Almos ...
Mylavaram - Intellectual Archive
... systems; whether the two coordinate systems are approaching or receding while as time is dilated depending upon the direction of approach or receding. The one way contraction and two way time dilation is logically a very absurd proposition. Philosophically this transformation converts absolute space ...
... systems; whether the two coordinate systems are approaching or receding while as time is dilated depending upon the direction of approach or receding. The one way contraction and two way time dilation is logically a very absurd proposition. Philosophically this transformation converts absolute space ...
Module1: Scale of the Universe
... Ask&your&students&to&discuss&some&possible&difBiculties&of&measuring&cosmic& distances&using¶llax.&Ensure&they&mention&the&following&points:& Parallax&shifts&are&always&small.&& Parallax&shift&is&even&smaller&than&the&apparent&size&of&the&star.&In&additional,& starlight&is&refracted&by&Earth's&a ...
... Ask&your&students&to&discuss&some&possible&difBiculties&of&measuring&cosmic& distances&using¶llax.&Ensure&they&mention&the&following&points:& Parallax&shifts&are&always&small.&& Parallax&shift&is&even&smaller&than&the&apparent&size&of&the&star.&In&additional,& starlight&is&refracted&by&Earth's&a ...
GRB – The Afterglow
... universe collapsed to form the first (Pop III) massive stars, which probably produced the first GRBs. GRBs may have preceded the formation of the first galaxies and active galactic nuclei/quasars, which are powered by supermassive black holes and formed even later. Thus, GRBs may probe the propertie ...
... universe collapsed to form the first (Pop III) massive stars, which probably produced the first GRBs. GRBs may have preceded the formation of the first galaxies and active galactic nuclei/quasars, which are powered by supermassive black holes and formed even later. Thus, GRBs may probe the propertie ...
SciPoster_Jan2009
... areas of our Galaxy and the Universe, dating all the way back to nearly the beginning of time (e.g., Yan et al. 2005). This dust was formed initially from massive short-lived stars such as Cassiopeia A (e.g., Rho 2008). Dust can also be formed from old, dying stars that used to be like our Sun. Dust ...
... areas of our Galaxy and the Universe, dating all the way back to nearly the beginning of time (e.g., Yan et al. 2005). This dust was formed initially from massive short-lived stars such as Cassiopeia A (e.g., Rho 2008). Dust can also be formed from old, dying stars that used to be like our Sun. Dust ...