Final Stages of Stellar Evolution - supernovae and the synthesis of
... Neutron Stars (2) Different Types Of Neutron Stars ...
... Neutron Stars (2) Different Types Of Neutron Stars ...
1. The Birth of a Star
... viewscreen, it is crossing the center of the screen and is where the highest concentration of stars exists. That white stuff is actually stars … billions of stars … clustered so close together that their light merges into a broad milky haze. Mixed in with the stars is also gas and dust … countless t ...
... viewscreen, it is crossing the center of the screen and is where the highest concentration of stars exists. That white stuff is actually stars … billions of stars … clustered so close together that their light merges into a broad milky haze. Mixed in with the stars is also gas and dust … countless t ...
3D Tour of the Universe Template
... Centaurus A looks nothing like the galaxies we've seen so far. This is one of the most peculiar local galaxies; it exhibits a very odd morphology and is an unusually strong source of radio emission. Its strange shape results from a projection effect- it is aligned with its disk edge-on to us. But yo ...
... Centaurus A looks nothing like the galaxies we've seen so far. This is one of the most peculiar local galaxies; it exhibits a very odd morphology and is an unusually strong source of radio emission. Its strange shape results from a projection effect- it is aligned with its disk edge-on to us. But yo ...
The new Basel high-latitude field star survey of the Galaxy
... Abstract. We discuss star count and three-color data for the two inner-Galaxy fields SA 107 and NGC 6171 observed in the new Basel RGU high-latitude field star survey. Our analysis is based on the structural models of the Galactic population components that were derived from the previous studies of ...
... Abstract. We discuss star count and three-color data for the two inner-Galaxy fields SA 107 and NGC 6171 observed in the new Basel RGU high-latitude field star survey. Our analysis is based on the structural models of the Galactic population components that were derived from the previous studies of ...
1. INTRODUCTION - Institut für Theoretische Astrophysik
... These results show that the dominant heating mechanism in chromospheric basal Ñux stars may be acoustic rather than magnetic. An alternative, or perhaps supplementary, explanation of basal heating is that it may be caused by heating due to intrinsically weak magnetic Ðelds generated by the dynamo me ...
... These results show that the dominant heating mechanism in chromospheric basal Ñux stars may be acoustic rather than magnetic. An alternative, or perhaps supplementary, explanation of basal heating is that it may be caused by heating due to intrinsically weak magnetic Ðelds generated by the dynamo me ...
Constraining tidal dissipation in F-type main
... circular orbits and when the spin axis is aligned with the orbital angular momentum. In this regard, the values given here must be considered as estimates and for illustration purpose only, because high eccentricity and/or obliquity have been measured for some of these systems. According to the dyna ...
... circular orbits and when the spin axis is aligned with the orbital angular momentum. In this regard, the values given here must be considered as estimates and for illustration purpose only, because high eccentricity and/or obliquity have been measured for some of these systems. According to the dyna ...
KIC 10449976: discovery of an extreme helium
... covers a wide range in effective temperature Teff , surface gravity g and helium abundance nHe for a number of distributions of elements heavier than helium, including solar, 1/10 solar and other custom-designed mixtures (Behara & Jeffery 2006). For the optical spectrum of KIC 10449976 we sought sol ...
... covers a wide range in effective temperature Teff , surface gravity g and helium abundance nHe for a number of distributions of elements heavier than helium, including solar, 1/10 solar and other custom-designed mixtures (Behara & Jeffery 2006). For the optical spectrum of KIC 10449976 we sought sol ...
Chapter 1 - Princeton University Press
... Hubble studied the Andromeda Nebula, which had been thought by many, including Shapley, to be a gas cloud within the Milky Way. The word nebula comes from the Latin nubes, or “cloud,” denoting the fuzzy appearance of these objects. By careful observations with the new 100-inch telescope, Hubble disc ...
... Hubble studied the Andromeda Nebula, which had been thought by many, including Shapley, to be a gas cloud within the Milky Way. The word nebula comes from the Latin nubes, or “cloud,” denoting the fuzzy appearance of these objects. By careful observations with the new 100-inch telescope, Hubble disc ...
Why is the Sun very dense on the inside?
... a) Some stars are larger than others and therefore appear larger. b) Some stars are nearer than others and therefore appear larger. c) Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. d) Sometimes what looks like a single star is actu ...
... a) Some stars are larger than others and therefore appear larger. b) Some stars are nearer than others and therefore appear larger. c) Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. d) Sometimes what looks like a single star is actu ...
Word version - White dwarf stars and the Chandrasekhar limit
... radiate, to a fair approximation, like black bodies, with temperatures well correlated with color, the dimness of Sirius B could not be explained as low surface brightness. Although some suggested that it might be reflected light from Sirius, Adams pointed out that a similar star had been found with ...
... radiate, to a fair approximation, like black bodies, with temperatures well correlated with color, the dimness of Sirius B could not be explained as low surface brightness. Although some suggested that it might be reflected light from Sirius, Adams pointed out that a similar star had been found with ...
Asteroseismology and stellar rotation - IAG-Usp
... Mass loss or transport mechanism is dominant in influencing Prot depending on the mass of the star (M >12 <12Msol) Determination of Prot versus distance from the ZAMS ...
... Mass loss or transport mechanism is dominant in influencing Prot depending on the mass of the star (M >12 <12Msol) Determination of Prot versus distance from the ZAMS ...
Stellar Lifetimes
... Open cluster: A few thousand loosely packed stars © 2007 Pearson Education Inc., publishing as Pearson Addison-Wesley ...
... Open cluster: A few thousand loosely packed stars © 2007 Pearson Education Inc., publishing as Pearson Addison-Wesley ...
Automated Detection and Analysis of Meteor Events Using Nightly
... I created multiple programs to determine the calibration of an event. My programs were created in the IDL programming langue, I used three programs FIND, APER, and dbfind from the NASA IDL library within the programs that I have created. The first thing I had to do was remove the non-stars from the ...
... I created multiple programs to determine the calibration of an event. My programs were created in the IDL programming langue, I used three programs FIND, APER, and dbfind from the NASA IDL library within the programs that I have created. The first thing I had to do was remove the non-stars from the ...
Word - Stefan`s Florilegium
... pulley. The other end of the string was connected to a weight while a shaft connected the pulley to a pointer. As the water level in the collection container rose, so too would the float. This would cause the weight at the other end of the string to fall and the pulley, with the attached pointer, to ...
... pulley. The other end of the string was connected to a weight while a shaft connected the pulley to a pointer. As the water level in the collection container rose, so too would the float. This would cause the weight at the other end of the string to fall and the pulley, with the attached pointer, to ...
The Gaseous Halo of NGC 891 Edmund Hodges-Kluck Joel Bregman
... • Galaxy Halos • NGC 891 as an interesting case • Halo Metallicity • X-ray Measurements • Metallicity in the cool gas ...
... • Galaxy Halos • NGC 891 as an interesting case • Halo Metallicity • X-ray Measurements • Metallicity in the cool gas ...
Rigorous treatment of barycentric stellar motion
... by Eisner (1967) the rigorous propagation was derived as a series expansion in t and v/c, though in a form not very useful for practical application. The author concluded that the light-time effect “can be neglected in astrometry of present-day precision, though not necessarily if measurement outside ...
... by Eisner (1967) the rigorous propagation was derived as a series expansion in t and v/c, though in a form not very useful for practical application. The author concluded that the light-time effect “can be neglected in astrometry of present-day precision, though not necessarily if measurement outside ...
Starspots: A Key to the Stellar Dynamo | SpringerLink
... Evolved binary components which are tidally locked at fast rotation by a close companion are also strongly magnetically active (RS CVn-type, BY Dra-type, W UMa-type, and Algol-like systems). Rapidly rotating single giants of FK Com-type, which are probably formed from coalesced binaries complete the ...
... Evolved binary components which are tidally locked at fast rotation by a close companion are also strongly magnetically active (RS CVn-type, BY Dra-type, W UMa-type, and Algol-like systems). Rapidly rotating single giants of FK Com-type, which are probably formed from coalesced binaries complete the ...
Interpretation of the Helix Planetary Nebula using Hydro
... From the HST/ACS images of the Tadpole merger, the inner halo is baryonic and homogeneous except for dark-dwarf-galaxy PGC clusters. Its large 130 kpc radius (R = 4 × 1021 m) is revealed by young-globular-clusters (YGCs) and stars triggered into formation by tidal forces and radiation from the mergi ...
... From the HST/ACS images of the Tadpole merger, the inner halo is baryonic and homogeneous except for dark-dwarf-galaxy PGC clusters. Its large 130 kpc radius (R = 4 × 1021 m) is revealed by young-globular-clusters (YGCs) and stars triggered into formation by tidal forces and radiation from the mergi ...
The size and shape of the Milky Way disc and halo from M
... (NIR; Stanway et al. 2008). They can be distinguished from z ∼ 5–6 galaxies on the basis of their spectra. Like Lyman-break galaxies, Mand L-dwarfs show abrupt breaks in their spectra, but deep molecular absorption lines in the continuum longwards of the first detected break allow observers to disti ...
... (NIR; Stanway et al. 2008). They can be distinguished from z ∼ 5–6 galaxies on the basis of their spectra. Like Lyman-break galaxies, Mand L-dwarfs show abrupt breaks in their spectra, but deep molecular absorption lines in the continuum longwards of the first detected break allow observers to disti ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.