Determining the Cepheid Period–Luminosity Relation Using
... on the V- and I-band photometry, which has been employed in particular by the Hubble Space Telescope Key Project on the extragalactic distance scale (Freedman et al., 2001). We find a significant effect in the sense that metal-poor stars are fainter than metal-rich stars by 0.23 ± 0.1 mag per dex. T ...
... on the V- and I-band photometry, which has been employed in particular by the Hubble Space Telescope Key Project on the extragalactic distance scale (Freedman et al., 2001). We find a significant effect in the sense that metal-poor stars are fainter than metal-rich stars by 0.23 ± 0.1 mag per dex. T ...
PPT
... – physical characteristics of all Galactic components – initial mass function, binaries, chemical evolution – star formation histories ...
... – physical characteristics of all Galactic components – initial mass function, binaries, chemical evolution – star formation histories ...
1_Introduction
... In the jargon of astronomers, a “standard candle” is a light source of known luminosity. Luminosity is the rate at which light source radiates away energy (in other words, it’s the wattage). ...
... In the jargon of astronomers, a “standard candle” is a light source of known luminosity. Luminosity is the rate at which light source radiates away energy (in other words, it’s the wattage). ...
Search For Dark Matters Essay Research Paper
... our telescopes.) The most obvious example of the gravitational effects of dark matter can be observed when looking at the rotation of galaxies. To study galactic rotation, astronomers look at the emission line spectra of stars in each part of the galaxy. When the light from a star is observed using ...
... our telescopes.) The most obvious example of the gravitational effects of dark matter can be observed when looking at the rotation of galaxies. To study galactic rotation, astronomers look at the emission line spectra of stars in each part of the galaxy. When the light from a star is observed using ...
Joining the Party - Lincoln-Sudbury Regional High School
... hydrogen in an ionised state. In other words, it consists of bare protons. These protons have the same charge. So they loathe each other, and the closer they get the worse it gets. ...
... hydrogen in an ionised state. In other words, it consists of bare protons. These protons have the same charge. So they loathe each other, and the closer they get the worse it gets. ...
FRA2015_mmMM_Junzhi_Wang
... • Mainly in star forming regions, evolved stars and also Supernova remnants • More than 10 molecules were found to have maser emissions (OH, H2O, CH3OH, H2CO, SiO, HCN, CH, NH3,etc.) • Masers can be pumped by collision or radiation • Masers can be used for astrophysical and astrometry studies, such ...
... • Mainly in star forming regions, evolved stars and also Supernova remnants • More than 10 molecules were found to have maser emissions (OH, H2O, CH3OH, H2CO, SiO, HCN, CH, NH3,etc.) • Masers can be pumped by collision or radiation • Masers can be used for astrophysical and astrometry studies, such ...
Small galaxies are growing smaller
... have the spectacular appearance we see in “coffee table” books. Indeed, in the early days of extragalactic astronomy it was thought that most galaxies were of rather similar (large) luminosities. Specifically, Edwin Hubble (1936) and his contemporaries believed that the luminosity function (LF) of g ...
... have the spectacular appearance we see in “coffee table” books. Indeed, in the early days of extragalactic astronomy it was thought that most galaxies were of rather similar (large) luminosities. Specifically, Edwin Hubble (1936) and his contemporaries believed that the luminosity function (LF) of g ...
Sterrenstelsels en Cosmologie Docent: M. Franx, kamer 425
... De Vaucouleurs introduced a classification scheme which was slightly different, classifying into “ring” and “s-shaped”, and bars. He also introduced a numerical type t running from -5 to 10. ...
... De Vaucouleurs introduced a classification scheme which was slightly different, classifying into “ring” and “s-shaped”, and bars. He also introduced a numerical type t running from -5 to 10. ...
Document
... - Strong emission lines of Hα and [NII] can be more easily detected and measured than weak broad H and K absorption lines. -[Si VI]: new technique employed for the first time in the study of NGC1068 (Tecza et al.2000); -For a limited number of nearby galaxies, RC can be produced from velocity of ind ...
... - Strong emission lines of Hα and [NII] can be more easily detected and measured than weak broad H and K absorption lines. -[Si VI]: new technique employed for the first time in the study of NGC1068 (Tecza et al.2000); -For a limited number of nearby galaxies, RC can be produced from velocity of ind ...
An introduce of the spectrograph of the GALEX
... but has remained nearly constant for red galaxies. These results imply that the number and total stellar mass of blue galaxies have been substantially constant since z~1, whereas those of red galaxies (near L*) have been significantly rising. To explain the new red galaxies, a ``mixed'' scenario is ...
... but has remained nearly constant for red galaxies. These results imply that the number and total stellar mass of blue galaxies have been substantially constant since z~1, whereas those of red galaxies (near L*) have been significantly rising. To explain the new red galaxies, a ``mixed'' scenario is ...
Galaxies: Interactions and Mergers Encyclopedia of Astronomy & Astrophysics eaa.iop.org C Mihos
... and velocities sample the phase space distribution of a normal disk galaxy. Current simulations employ 106 –107 particles, so that each particle represents 104 –105 stars (simulating galaxies star by star is still well beyond current computational abilities). The N-body model is then advanced forwar ...
... and velocities sample the phase space distribution of a normal disk galaxy. Current simulations employ 106 –107 particles, so that each particle represents 104 –105 stars (simulating galaxies star by star is still well beyond current computational abilities). The N-body model is then advanced forwar ...
M BH
... Collapse of a proto-galaxy onto a BH (Adams et al. 2001) Accretion of material shed by stars (Murphy et al. 1991). Feedback from energy release near the center may limit growth of the BH and of galaxy (Haehnelt et al. 1998; Silk & Rees 1998). Feedback from star formation may also (Burkert & Silk 200 ...
... Collapse of a proto-galaxy onto a BH (Adams et al. 2001) Accretion of material shed by stars (Murphy et al. 1991). Feedback from energy release near the center may limit growth of the BH and of galaxy (Haehnelt et al. 1998; Silk & Rees 1998). Feedback from star formation may also (Burkert & Silk 200 ...
Turbulent Flow-Driven Molecular Cloud Formation: A Solution to the
... yet the ages of the stars produced by these clouds provide uniquely detailed constraints on cloud ages that are not obtainable in any other way (e.g., Hartmann et al. 1991; Feigelson 1996). Because of the importance of the stellar population ages, it is worth reviewing the situation in some detail, ...
... yet the ages of the stars produced by these clouds provide uniquely detailed constraints on cloud ages that are not obtainable in any other way (e.g., Hartmann et al. 1991; Feigelson 1996). Because of the importance of the stellar population ages, it is worth reviewing the situation in some detail, ...
Lecture 9/10 Stellar evolution Ulf Torkelsson 1 Main sequence stars
... actually producing more power than the core did the luminosity of the star increases. The star is then a sub-giant. The helium that is produced will be dropped on the still hot helium core. When the helium core has grown sufficiently big compared to the rest of the Sun, that it has reached the Chand ...
... actually producing more power than the core did the luminosity of the star increases. The star is then a sub-giant. The helium that is produced will be dropped on the still hot helium core. When the helium core has grown sufficiently big compared to the rest of the Sun, that it has reached the Chand ...
Photometric analysis of the globular cluster NGC5466
... open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; therefore, their density is low. The population of open clusters is quite young and some bright blue stars are iden ...
... open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; therefore, their density is low. The population of open clusters is quite young and some bright blue stars are iden ...
The Birdseed Galaxy - Secondary Education
... meters) tall? (If no one, indicate on your body how high four feet is). Imagine a football field surrounded by a wall four feet high. Fill the football field with this birdseed to the top of the wall. That’s the volume of 200 billion seeds (representing the 200 billion stars in the Milky Way Galaxy. ...
... meters) tall? (If no one, indicate on your body how high four feet is). Imagine a football field surrounded by a wall four feet high. Fill the football field with this birdseed to the top of the wall. That’s the volume of 200 billion seeds (representing the 200 billion stars in the Milky Way Galaxy. ...
The Classification of Galaxies By Daniel Underwood Contents The
... nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the Milky Way were becoming more and more noticed by astronomers, and they had their own characteristics which helped identify them. But it ...
... nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the Milky Way were becoming more and more noticed by astronomers, and they had their own characteristics which helped identify them. But it ...
Studies of young stellar objects (25+5)
... The EVLA and jet kinematics • Proper motions now limited by sensitivity: impossible to detect in weak jets, very difficult to follow up ejecta that become too weak with time. • With the possibility of recombination line “stacking” we may be able to detect radial ...
... The EVLA and jet kinematics • Proper motions now limited by sensitivity: impossible to detect in weak jets, very difficult to follow up ejecta that become too weak with time. • With the possibility of recombination line “stacking” we may be able to detect radial ...
Lecture1-1
... parenthesis shows the “effective wavelength” and detection limit in magnitude for point sources) with drift-scan mode of the mosaic CCD camera. Typical image size is 1.4” in r-band. ...
... parenthesis shows the “effective wavelength” and detection limit in magnitude for point sources) with drift-scan mode of the mosaic CCD camera. Typical image size is 1.4” in r-band. ...
Chapter 18 - Astronomy
... 18.3 Dark Dust Clouds Light from distant stars may pass through more than one nebula; it is often possible to sort out the spectra of the star and the nebulae. ...
... 18.3 Dark Dust Clouds Light from distant stars may pass through more than one nebula; it is often possible to sort out the spectra of the star and the nebulae. ...
ORBITAL MOTION
... onto the protostar of (accumulating) mass M and radius R. Star accumulates gas from envelope through the disc, releases some through jets back into cloud. The jets are thought to be the channels for the extraction of angular momentum. Jets: extend parsecs from source. They are seen through their imp ...
... onto the protostar of (accumulating) mass M and radius R. Star accumulates gas from envelope through the disc, releases some through jets back into cloud. The jets are thought to be the channels for the extraction of angular momentum. Jets: extend parsecs from source. They are seen through their imp ...
Document
... falls into another neutron star or black hole. The resulting explosion sends out particles and radiation all over the spectrum They are the most luminous things in the universe In May a GRB was seen at redshift 8. It is the farthest thing ever seen and occurred only 400 million years after the big b ...
... falls into another neutron star or black hole. The resulting explosion sends out particles and radiation all over the spectrum They are the most luminous things in the universe In May a GRB was seen at redshift 8. It is the farthest thing ever seen and occurred only 400 million years after the big b ...
Nucleosynthesis, the r-Process, Abundances and Jim Truran
... Element Abundances in Metal-deficient Stars Cowan, Thielemann & Truran (1991) The r-Process and Nucleochronology Fields, Truran & Cowan (2002) A Simple Model for rProcess Scatter and Halo Evolution Truran et al. (2002) Probing the Neutron Capture Nucleosynthesis History of Galactic Matter ...
... Element Abundances in Metal-deficient Stars Cowan, Thielemann & Truran (1991) The r-Process and Nucleochronology Fields, Truran & Cowan (2002) A Simple Model for rProcess Scatter and Halo Evolution Truran et al. (2002) Probing the Neutron Capture Nucleosynthesis History of Galactic Matter ...