Globular Clusters - University of Dayton
... Turn Off - As the hydrogen fuel in a star's core runs out the core begins to collapse due to gravity and the star moves away from the main sequence. At the turn off nearly all the central fuel is gone. Red Giant Branch - When the central fuel is gone, hydrogen starts to burn in an envelope around a ...
... Turn Off - As the hydrogen fuel in a star's core runs out the core begins to collapse due to gravity and the star moves away from the main sequence. At the turn off nearly all the central fuel is gone. Red Giant Branch - When the central fuel is gone, hydrogen starts to burn in an envelope around a ...
An Ancient Method of Finding and Extending Direction
... a table, so that it can be shifted to the star's eastwest extremities, which are then bisected. The east-west axis of the slat may be found on the previous day, he suggests, by using the same method or by a study of the shortest shadow of the sun. However, he states, finding the axis in either manne ...
... a table, so that it can be shifted to the star's eastwest extremities, which are then bisected. The east-west axis of the slat may be found on the previous day, he suggests, by using the same method or by a study of the shortest shadow of the sun. However, he states, finding the axis in either manne ...
this PDF file
... instrumental profile. Although SME requires the “metallicity” ratio [M/H] rather than [Fe/H], we used [Fe/H] determined in [3] as the closest approximation to metallicity. We used SME in the 669.5-672.5 nm ranges and fitted the 7Li line at 670.8 nm as well as several lines of Al, Ti, Si and Ca, rota ...
... instrumental profile. Although SME requires the “metallicity” ratio [M/H] rather than [Fe/H], we used [Fe/H] determined in [3] as the closest approximation to metallicity. We used SME in the 669.5-672.5 nm ranges and fitted the 7Li line at 670.8 nm as well as several lines of Al, Ti, Si and Ca, rota ...
Slides - Indico
... H = Hubble constant G = Newton's gravitational constant = energy density (i.e. photons and neutrinos density in the early Universe) ...
... H = Hubble constant G = Newton's gravitational constant = energy density (i.e. photons and neutrinos density in the early Universe) ...
Chapter 3a powerpoint presentation
... Absolute Magnitude We are unable to tell just by looking at the night sky if one star is fainter than another because it is intrinsically fainter (ie. lower luminosity) or just further away. To realistically compare stars on an equal basis we introduce the concept of Absolute magnitude (M) which is ...
... Absolute Magnitude We are unable to tell just by looking at the night sky if one star is fainter than another because it is intrinsically fainter (ie. lower luminosity) or just further away. To realistically compare stars on an equal basis we introduce the concept of Absolute magnitude (M) which is ...
Sin título de diapositiva - Universitat de Barcelona
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
Galaxy Formation, Theory and Modelling
... comparable to that from WMAP+ estimates. • The values do not agree, with WMAP3+ preferring (Spergel et al 2007) s 8 0.75 0.05 • If the method is robust we should get consistent results for datasets with different luminosity and colour selections. ...
... comparable to that from WMAP+ estimates. • The values do not agree, with WMAP3+ preferring (Spergel et al 2007) s 8 0.75 0.05 • If the method is robust we should get consistent results for datasets with different luminosity and colour selections. ...
Stars and Galaxies
... achieve. For this reason, astronomers use space telescopes, such as the Hubble Space Telescope shown in Figure 5. The clear images provided by Hubble are changing scientists’ ideas about space. One Figure 5 The Hubble Space Telescope orbits Earth at an object viewed by Hubble is the massive galaxy a ...
... achieve. For this reason, astronomers use space telescopes, such as the Hubble Space Telescope shown in Figure 5. The clear images provided by Hubble are changing scientists’ ideas about space. One Figure 5 The Hubble Space Telescope orbits Earth at an object viewed by Hubble is the massive galaxy a ...
gravitational wave Universe - UO Physics
... The Sun radiates 4x1026 watt (1 watt is 1 J/s). Over the Sun’s lifetime of 10 billion years, it will produce ~1.2x1044 J. The Milky Way galaxy shines with power ~ 4x1037 watt (the combined light of 100-200 billion stars). ...
... The Sun radiates 4x1026 watt (1 watt is 1 J/s). Over the Sun’s lifetime of 10 billion years, it will produce ~1.2x1044 J. The Milky Way galaxy shines with power ~ 4x1037 watt (the combined light of 100-200 billion stars). ...
The Hidden Lives of Galaxies NSTA 2001
... beyond the visible limits of the galaxy. The temperature of the gas is a measure of its velocity and energy. This gas is so hot (about 10 million degrees Kelvin, or 18 million degrees F), and consequently has such a high velocity, that it first appears to be escaping from the galaxy. Indeed, the amo ...
... beyond the visible limits of the galaxy. The temperature of the gas is a measure of its velocity and energy. This gas is so hot (about 10 million degrees Kelvin, or 18 million degrees F), and consequently has such a high velocity, that it first appears to be escaping from the galaxy. Indeed, the amo ...
Lecture 9: Supernovae
... faded quickly until June 1987. Then it settled into a much slower fade, of about 1% a day, for two years. This corresponds exactly to the laboratory-measured half-life of 56 Co (77 days), which is the result of the (rapid) decay of 56 Ni which is produced in the blast. We could even determine the ma ...
... faded quickly until June 1987. Then it settled into a much slower fade, of about 1% a day, for two years. This corresponds exactly to the laboratory-measured half-life of 56 Co (77 days), which is the result of the (rapid) decay of 56 Ni which is produced in the blast. We could even determine the ma ...
Origin of close binary systems
... (cf. AE Aurigae and Columbae) close binary evolution of massive stars (future of Theta-1 Ori C, A, B binaries?) ...
... (cf. AE Aurigae and Columbae) close binary evolution of massive stars (future of Theta-1 Ori C, A, B binaries?) ...
Project 9: Stellar Spectra: Temperature
... spectrum even though there is 440,000 times as much hydrogen as calcium. Hydrogen has a low efficiency of absorption, whereas that of ionized calcium is very high. The efficiency depends on the availability of electrons to move to higher energies and on atomic factors, namely the l ...
... spectrum even though there is 440,000 times as much hydrogen as calcium. Hydrogen has a low efficiency of absorption, whereas that of ionized calcium is very high. The efficiency depends on the availability of electrons to move to higher energies and on atomic factors, namely the l ...
An additional term of the Galactic tide due to dark matter
... If we consider the density of Galactic matter in solar vicinity ρ = 0.10 M pc−3 (Holmberg & Flynn 2000), then the ratio of amplitudes of both dominant z̃-term and dark-matter x̃-term equals 4πk2 ρ/(k2 Mo /R3o ) = 7.1. For the values of the Oort’s constants A = (14.8 ± 0.8) km s−1 kpc−1 and B = −(12 ...
... If we consider the density of Galactic matter in solar vicinity ρ = 0.10 M pc−3 (Holmberg & Flynn 2000), then the ratio of amplitudes of both dominant z̃-term and dark-matter x̃-term equals 4πk2 ρ/(k2 Mo /R3o ) = 7.1. For the values of the Oort’s constants A = (14.8 ± 0.8) km s−1 kpc−1 and B = −(12 ...