Lec10_ch12_deathofstars
... Death of Massive Stars • As iron core grows, the immense weight is supported by electron degeneracy pressure-ie, electron gas • Eventually the electron gas is compressed to the point that the electron degeneracy pressure is overcome by gravity--electrons combine with protons forming neutrons and em ...
... Death of Massive Stars • As iron core grows, the immense weight is supported by electron degeneracy pressure-ie, electron gas • Eventually the electron gas is compressed to the point that the electron degeneracy pressure is overcome by gravity--electrons combine with protons forming neutrons and em ...
GALEX and Star Formation
... colors including GALEX and SDSS bands, plotted as a function of age, for three metallicity values (given in the legend). The color excess for EB−V =0.25mag is shown on each color with vertical bars for four different types of extinction: MW-, LMC-, LMC2-, SMC-dust (bars from left to right). See sect ...
... colors including GALEX and SDSS bands, plotted as a function of age, for three metallicity values (given in the legend). The color excess for EB−V =0.25mag is shown on each color with vertical bars for four different types of extinction: MW-, LMC-, LMC2-, SMC-dust (bars from left to right). See sect ...
Local Group Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mario L Mateo
... making them very difficult to detect, even at close range1 . Much of the recent success in finding new Local Group members is due to the availability of the many largescale photographic surveys of the sky carried out since the seminal Palomar Sky Survey of the 1950s. Soon after these surveys were be ...
... making them very difficult to detect, even at close range1 . Much of the recent success in finding new Local Group members is due to the availability of the many largescale photographic surveys of the sky carried out since the seminal Palomar Sky Survey of the 1950s. Soon after these surveys were be ...
Chapter 10 Formation and evolution of the Local Group
... Summary: The Local Group (LG) is the group of galaxies gravitationally associated with the Galaxy and M 31. Galaxies within the LG have overcome the general expansion of the universe. There are approximately 75 galaxies in the LG within a diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A s ...
... Summary: The Local Group (LG) is the group of galaxies gravitationally associated with the Galaxy and M 31. Galaxies within the LG have overcome the general expansion of the universe. There are approximately 75 galaxies in the LG within a diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A s ...
Distance
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
Bonus Article: Get Real About Astrology
... wobble at the poles as it turns like a spinning top. Precession was arguably known to the Egyptians but in a literal sense we learnt about it through the Greek astronomer, Hipparchus (circa 130 BC) who is credited with discovering it. This knowledge was carried through to us by Claudius Ptolemy’s as ...
... wobble at the poles as it turns like a spinning top. Precession was arguably known to the Egyptians but in a literal sense we learnt about it through the Greek astronomer, Hipparchus (circa 130 BC) who is credited with discovering it. This knowledge was carried through to us by Claudius Ptolemy’s as ...
THE ABSOLUTE MAGNITUDE OF RR LYRAE - Cosmos
... globular clusters than the previous estimation (Bolte & Hogan 1995, Chaboyer et al. 1996b). However, the statistical parallax analysis and the `direct' estimation of MV in the present study support much fainter value than those obtained by them. That means, the age of the oldest globular clusters in ...
... globular clusters than the previous estimation (Bolte & Hogan 1995, Chaboyer et al. 1996b). However, the statistical parallax analysis and the `direct' estimation of MV in the present study support much fainter value than those obtained by them. That means, the age of the oldest globular clusters in ...
Distance determination for RAVE stars using stellar models
... matter is in the form of cold dark matter, cold referring to non-relativistic. Zwicky (1937) was the first to introduce dark matter to explain the missing mass in nebulae. By this definition dark matter does not interact with normal matter through the electro-magnetic force, but does interact throug ...
... matter is in the form of cold dark matter, cold referring to non-relativistic. Zwicky (1937) was the first to introduce dark matter to explain the missing mass in nebulae. By this definition dark matter does not interact with normal matter through the electro-magnetic force, but does interact throug ...
The accretion disk paradigm for young stars
... field of stellar spectroscopy, beginning with the Mount Wilson radial velocity and spectroscopic parallax program, which led in 1935 to the first comprehensive HertzsprungRussell diagram with 4179 stars (Adams et al. 1935), followed by his pioneering studies of long-period regular and semi-regular var ...
... field of stellar spectroscopy, beginning with the Mount Wilson radial velocity and spectroscopic parallax program, which led in 1935 to the first comprehensive HertzsprungRussell diagram with 4179 stars (Adams et al. 1935), followed by his pioneering studies of long-period regular and semi-regular var ...
Section 6 The Expanding Universe The Doppler Effect
... universe. Hubble was to demonstrate that there are many more galaxies. Currently astronomers believe that there are possibly 140 billion galax ies in the universe. In other words, if a galaxy was a chocolate raisin, there are enough to fill the SECC. Hubble’s two driving pursuits in his work were to ...
... universe. Hubble was to demonstrate that there are many more galaxies. Currently astronomers believe that there are possibly 140 billion galax ies in the universe. In other words, if a galaxy was a chocolate raisin, there are enough to fill the SECC. Hubble’s two driving pursuits in his work were to ...
Curriculum Vitae - Centre for Astrophysics and Supercomputing
... September 2008 – MPA Cosmology Seminar, Max-Planck-Institute for Astrophysics, Germany November 2007 – Seminar at the Center for Astrophysics of the University of Porto, Portugal ...
... September 2008 – MPA Cosmology Seminar, Max-Planck-Institute for Astrophysics, Germany November 2007 – Seminar at the Center for Astrophysics of the University of Porto, Portugal ...
Hertzsprung–Russell diagram - Wikipedia, the free encyclopedia
... that stars collapsed from red giants to dwarf stars, then moving down along the line of the main sequence in the course of their lifetimes. Stars were thought therefore to radiate energy by converting gravitational energy into radiation through the Kelvin–Helmholtz mechanism. This mechanism resulted ...
... that stars collapsed from red giants to dwarf stars, then moving down along the line of the main sequence in the course of their lifetimes. Stars were thought therefore to radiate energy by converting gravitational energy into radiation through the Kelvin–Helmholtz mechanism. This mechanism resulted ...
Practical cosmology with the Local Volume galaxies
... motion of the Local Sheet as a whole from the large Local Void towards the neighboring Leo cloud. Fig.2 presents the distribution of nearby galaxies in Supergalactic coordinates. The vector extending from our location indicates the Local Group motion (320 km/s) with respect to galaxies within 3000 k ...
... motion of the Local Sheet as a whole from the large Local Void towards the neighboring Leo cloud. Fig.2 presents the distribution of nearby galaxies in Supergalactic coordinates. The vector extending from our location indicates the Local Group motion (320 km/s) with respect to galaxies within 3000 k ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.