Our Local Group of Galaxies
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
Slide 1
... • An important result is that the solar photosphere and the primitive meteorites give very similar answers: this gives us confidence that our estimates of nebular composition are correct ...
... • An important result is that the solar photosphere and the primitive meteorites give very similar answers: this gives us confidence that our estimates of nebular composition are correct ...
PHY2083
... now 10 pc = 2.063 x 106 AU Inverse square law => flux will be 1 / (2.063 x 106)2 times lower => Flux at 10pc = 3.21 x 10-10 W / m2 ...
... now 10 pc = 2.063 x 106 AU Inverse square law => flux will be 1 / (2.063 x 106)2 times lower => Flux at 10pc = 3.21 x 10-10 W / m2 ...
Astronomical Distance Ladder
... This proper motion technique is capable of giving reliable distances up to around 800 parsecs. With the distances to many stars in the galaxy calculated by parallax different ways to calculate distance was needed to extend the astronomical distance ladder. It was also discovered that stars radiated ...
... This proper motion technique is capable of giving reliable distances up to around 800 parsecs. With the distances to many stars in the galaxy calculated by parallax different ways to calculate distance was needed to extend the astronomical distance ladder. It was also discovered that stars radiated ...
Herschel
... the Solar System placed beyond the orbit of Neptune (30 UA) up to ~55 UA. It is similar to the asteroid belt but 20 times wider and 20-200 times more massive. ...
... the Solar System placed beyond the orbit of Neptune (30 UA) up to ~55 UA. It is similar to the asteroid belt but 20 times wider and 20-200 times more massive. ...
microquasars
... Microquasars have provided insight into: -THE PHYSICS OF RELATIVISTIC JETS FROM BH’s -THE CONNECTION BETWEEN ACCRETION & EJECTION -THE FORMATION OF BLACK HOLES AND NEUTRON STARS: Can stars of >40 Msolar end as neutron stars rather than BHs ? Do BHs of >10 Msolar form promptly rather than in bright S ...
... Microquasars have provided insight into: -THE PHYSICS OF RELATIVISTIC JETS FROM BH’s -THE CONNECTION BETWEEN ACCRETION & EJECTION -THE FORMATION OF BLACK HOLES AND NEUTRON STARS: Can stars of >40 Msolar end as neutron stars rather than BHs ? Do BHs of >10 Msolar form promptly rather than in bright S ...
Lecture 2. Thermal evolution and surface emission of
... in CCOs with relatively long initial spin periods and low magnetic field, but do not observed representatives of this population around us, i.e. in the Solar vicinity. ...
... in CCOs with relatively long initial spin periods and low magnetic field, but do not observed representatives of this population around us, i.e. in the Solar vicinity. ...
The ages of pre-main-sequence stars
... tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate. However, the age determination can be very misleading, because it is significantly (generally different by a factor of 2 to 5) dependent on the accr ...
... tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate. However, the age determination can be very misleading, because it is significantly (generally different by a factor of 2 to 5) dependent on the accr ...
Star-Galaxy Classification Using Data Mining
... for more data-mining methods to be utilized in SExtractor can be beneficial to the astronomical community. The principle data investigated did not benefit from any particular balancing scheme, however the balanced data did refine our interpretations of the image, and led us to conclude that balancin ...
... for more data-mining methods to be utilized in SExtractor can be beneficial to the astronomical community. The principle data investigated did not benefit from any particular balancing scheme, however the balanced data did refine our interpretations of the image, and led us to conclude that balancin ...
What is a white dwarf?
... mass to its companion. This mass exchange can then change the remaining life histories of both stars. • Sun ...
... mass to its companion. This mass exchange can then change the remaining life histories of both stars. • Sun ...
IOSR Journal of Applied Physics (IOSR-JAP) ISSN: 2278-4861.
... This method of analysis has shown to be a simple method of verifying the new intensity formula by using atomic and stellar data. By using this method together with the new intensity formula it has been possible to determine the mean electron temperature in different laboratory plasmas and in the opt ...
... This method of analysis has shown to be a simple method of verifying the new intensity formula by using atomic and stellar data. By using this method together with the new intensity formula it has been possible to determine the mean electron temperature in different laboratory plasmas and in the opt ...
Collisions and close encounters involving massive main
... the radial cut-off, leading to a higher mass. We allowed all the SPH models to relax before beginning any simulations. Both massive SPH model stars expanded on relaxation, the low-resolution model slightly more so because of its lower mass, leaving the massive stellar models with radii of ≈6 R . Th ...
... the radial cut-off, leading to a higher mass. We allowed all the SPH models to relax before beginning any simulations. Both massive SPH model stars expanded on relaxation, the low-resolution model slightly more so because of its lower mass, leaving the massive stellar models with radii of ≈6 R . Th ...
Spectral analysis for the RV Tau star R Sct: In this section, we will
... A determination of their mean density can be used to estimate the amount of mass in their core as well as the conditions in their extended atmospheres. The mean density is also of general interest as often the value is less than the density of water and one can wax elegantly about large bathtubs and ...
... A determination of their mean density can be used to estimate the amount of mass in their core as well as the conditions in their extended atmospheres. The mean density is also of general interest as often the value is less than the density of water and one can wax elegantly about large bathtubs and ...
Dark matter
... The universe is flat on large scales; there isn’t enough mass to do the flattening, so there must be energy. If the energy emitted light, we’d have seen it by now, so it must be dark energy. ...
... The universe is flat on large scales; there isn’t enough mass to do the flattening, so there must be energy. If the energy emitted light, we’d have seen it by now, so it must be dark energy. ...
Pitt County Schools
... Sketch the Hertzsprung-Russell (H-R) diagram and show the main groups of stars on the diagram. Describe the mass-luminosity relationship. Describe the relationship that exists between a star’s luminosity, radius, and surface temperature. Relate the rate of the star’s evolution to the mass of the ...
... Sketch the Hertzsprung-Russell (H-R) diagram and show the main groups of stars on the diagram. Describe the mass-luminosity relationship. Describe the relationship that exists between a star’s luminosity, radius, and surface temperature. Relate the rate of the star’s evolution to the mass of the ...
Astronomy_Assignment_Sheet - Liberty Union High School
... Evaluate the evidence pertaining to the formation and age of the stars, terrestrial planets and gas planets. Support the evidence that the planets are much closer than the stars. Examine why the sun is a typical star powered by nuclear reactions, primarily the fusion of hydrogen to form helium. Anal ...
... Evaluate the evidence pertaining to the formation and age of the stars, terrestrial planets and gas planets. Support the evidence that the planets are much closer than the stars. Examine why the sun is a typical star powered by nuclear reactions, primarily the fusion of hydrogen to form helium. Anal ...
Activity : Milky Way
... And recall that, even away from such clouds, the average interstellar extinction is about one magnitude per kiloparsec toward the centre of the Galaxy. For our Galaxy therefore, dust serves only to hamper visual observations to greater distances. ...
... And recall that, even away from such clouds, the average interstellar extinction is about one magnitude per kiloparsec toward the centre of the Galaxy. For our Galaxy therefore, dust serves only to hamper visual observations to greater distances. ...
Stellar and emission line spectra
... temperature is higher than the region where the line is formed, then we get absorption (left panel). In contrast, if the photons we see in the line come from a region where the temperature is higher, we get an emission line (right panel). Se also Fig. 4. particular transition, so it varies strongly. ...
... temperature is higher than the region where the line is formed, then we get absorption (left panel). In contrast, if the photons we see in the line come from a region where the temperature is higher, we get an emission line (right panel). Se also Fig. 4. particular transition, so it varies strongly. ...
The evolution of galaxy groups
... groups have few members. • Things to find out: – What is efficiency of galaxy formation in groups? Need stellar mass, gas mass, dynamical mass – What is star formation rate? [OII], Ha, UV ...
... groups have few members. • Things to find out: – What is efficiency of galaxy formation in groups? Need stellar mass, gas mass, dynamical mass – What is star formation rate? [OII], Ha, UV ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.