Slide 1
... Making of a spiral galaxy • Start with a fairly uniform cloud of hydrogen • Gravitational collapse forms protogalactic clouds • First stars are born in this spheroid (such stars are billions of years old “fossil record”) ...
... Making of a spiral galaxy • Start with a fairly uniform cloud of hydrogen • Gravitational collapse forms protogalactic clouds • First stars are born in this spheroid (such stars are billions of years old “fossil record”) ...
Document
... Teff = 4500 K. The two stars are of nearly equal V magnitude. What is the ratio of their fluxes at 2 microns? • In an eclipsing binary system, comprised of a B5V star at Teff = 16,000K and an F0III star at Teff = 7000K, the two stars are known to have nearly equal diameters. How deep will the primar ...
... Teff = 4500 K. The two stars are of nearly equal V magnitude. What is the ratio of their fluxes at 2 microns? • In an eclipsing binary system, comprised of a B5V star at Teff = 16,000K and an F0III star at Teff = 7000K, the two stars are known to have nearly equal diameters. How deep will the primar ...
Neutron stars and black holes
... The mass of the proton is 1.67 X 10-24 g, and its radius is about 0.877 X 10-13 cm (according to the Wikipedia). The volume of the proton is 4/3 r3 = 2.82 X 10-39 cm3. The density = mass/volume = 5.9 X 1014 g/cm3. The Sun’s mass is 2 X 1030 kg = 2 X 1033 g. A one solar mass black hole has radius r ...
... The mass of the proton is 1.67 X 10-24 g, and its radius is about 0.877 X 10-13 cm (according to the Wikipedia). The volume of the proton is 4/3 r3 = 2.82 X 10-39 cm3. The density = mass/volume = 5.9 X 1014 g/cm3. The Sun’s mass is 2 X 1030 kg = 2 X 1033 g. A one solar mass black hole has radius r ...
Which Stars Form Black Holes and Neutron Stars?
... Similar results have been obtained for three other magnetars. SGR 1806-20 is a member of a star cluster containing at least 4 carbon-type Wolf Rayet stars, 3 OB supergiants, and a luminous blue variable [23, 18, 21].2 Red supergiants have not yet formed, which suggests that the cluster is 3.0–4.5 My ...
... Similar results have been obtained for three other magnetars. SGR 1806-20 is a member of a star cluster containing at least 4 carbon-type Wolf Rayet stars, 3 OB supergiants, and a luminous blue variable [23, 18, 21].2 Red supergiants have not yet formed, which suggests that the cluster is 3.0–4.5 My ...
Stellar Mass Assembly History
... “Spectroscopic Confirmation of Multiple Red GalaxyGalaxy Mergers at z < 1” -- Tran et al. 2005 ApJ627,L25 ...
... “Spectroscopic Confirmation of Multiple Red GalaxyGalaxy Mergers at z < 1” -- Tran et al. 2005 ApJ627,L25 ...
Heyvaerts
... Probably a rare type of supernova (hypernovae) A star should end as an hypernova with probability 10-6. M > 40 MO (?) Massive star core collapse when merging with a companion ? Propulsion by radiation (?) Neutrinos : efficiency pb. If centrifugal MHD wind from collapsing core, 1015 Gauss required to ...
... Probably a rare type of supernova (hypernovae) A star should end as an hypernova with probability 10-6. M > 40 MO (?) Massive star core collapse when merging with a companion ? Propulsion by radiation (?) Neutrinos : efficiency pb. If centrifugal MHD wind from collapsing core, 1015 Gauss required to ...
April Skies
... different constellations which form the asterism referred to as the winter hexagon and described by Carol Latta the January newsletter. Not only does the Milky Way pass through this asterism but so does the ecliptic – the plane of our solar system – the track in which you will find the planets, moon ...
... different constellations which form the asterism referred to as the winter hexagon and described by Carol Latta the January newsletter. Not only does the Milky Way pass through this asterism but so does the ecliptic – the plane of our solar system – the track in which you will find the planets, moon ...
Light Years - Spring Creek Elementary
... years in circumference. The Milky Way consists of 200 to 400 billion stars. The Milky Way is one of billions of galaxies in the known universe. One of the closest galaxies to our own is Andromeda Galaxy. Andromeda is about 2.5 million light years away and contains about 1 trillion stars. This shows ...
... years in circumference. The Milky Way consists of 200 to 400 billion stars. The Milky Way is one of billions of galaxies in the known universe. One of the closest galaxies to our own is Andromeda Galaxy. Andromeda is about 2.5 million light years away and contains about 1 trillion stars. This shows ...
here - ESA Science
... Perhaps the densely-filled star and gas environment of the spiral arms have an effect on the Earth’s climate. Mapping the positions and motions of stars allows astronomers to develop a frame of reference which in turn means that comparisons can be made between measurements of the same object taken a ...
... Perhaps the densely-filled star and gas environment of the spiral arms have an effect on the Earth’s climate. Mapping the positions and motions of stars allows astronomers to develop a frame of reference which in turn means that comparisons can be made between measurements of the same object taken a ...
PowerPoint Presentation - Center for Gravitational Wave Physics
... Assume that the Ia rate tracks the stellar mass and star formation rate as measured by Mannucci et al., then measure the constants from local galaxies to get (Scannapieco & L.B. ‘05) ...
... Assume that the Ia rate tracks the stellar mass and star formation rate as measured by Mannucci et al., then measure the constants from local galaxies to get (Scannapieco & L.B. ‘05) ...
File - The Physics Doctor
... * Cepheid variable stars have long been seen as examples of standard candles. Recent measurements have indicated that the movement of the star through the interstellar material might result in the formation of a layer of dust around the star. This affects how bright the star appears. Explain how sta ...
... * Cepheid variable stars have long been seen as examples of standard candles. Recent measurements have indicated that the movement of the star through the interstellar material might result in the formation of a layer of dust around the star. This affects how bright the star appears. Explain how sta ...
1 Epiphany 2014 Following Stars Fr. Frank Schuster In preparation
... Charlie Sheen and Kayne West. Please know I have nothing against other Twitter stars, it is just that, come on, we are talking about the Pope here. On the other hand, to be fair, Francis has only been Pope since March I suppose. And admittedly, tweets along the lines of “Go to Church, Say your Praye ...
... Charlie Sheen and Kayne West. Please know I have nothing against other Twitter stars, it is just that, come on, we are talking about the Pope here. On the other hand, to be fair, Francis has only been Pope since March I suppose. And admittedly, tweets along the lines of “Go to Church, Say your Praye ...
31Emission
... compositions: mostly hydrogen (90%) and helium (9%) and only a bit of everything else! – Different absorption spectra of stars originally led to spectral classification, and spectral types of stars, which are now understood to be a sequence of stellar temperatures: OBAFGKM (the Sun is a G star) ...
... compositions: mostly hydrogen (90%) and helium (9%) and only a bit of everything else! – Different absorption spectra of stars originally led to spectral classification, and spectral types of stars, which are now understood to be a sequence of stellar temperatures: OBAFGKM (the Sun is a G star) ...
Jets in the DR21/W75N Star Forming Region
... Motivation: Velocity information can (1) establish a kinematic distance for an outflow, thereby allowing us to confidently associate a jet with a specific molecular cloud, and (2) distinguish red and blue-shifted lobes, so that we can identify the likely locations of outflow sources. We now know tha ...
... Motivation: Velocity information can (1) establish a kinematic distance for an outflow, thereby allowing us to confidently associate a jet with a specific molecular cloud, and (2) distinguish red and blue-shifted lobes, so that we can identify the likely locations of outflow sources. We now know tha ...
Primordial Planet Formation - University of California San Diego
... It is important to ask this question. If these hydrogen clouds are in fact the outer atmospheres of primordial planets that are the universal ordinary dark matter, at what time after the Big Bang (at what redshift) did they cool below the hydrogen triple point temperature? Recall that when the p ...
... It is important to ask this question. If these hydrogen clouds are in fact the outer atmospheres of primordial planets that are the universal ordinary dark matter, at what time after the Big Bang (at what redshift) did they cool below the hydrogen triple point temperature? Recall that when the p ...
PHYSICS – Astrophysics Section I
... Identify the general types of spectra produced by stars, emission nebulae, galaxies and quasars Stars produce absorption spectra. The light actually produced by nuclear fusion is continuous, but the atmosphere of the star selectively absorbs wavelengths, forming an absorption spectrum. This is used ...
... Identify the general types of spectra produced by stars, emission nebulae, galaxies and quasars Stars produce absorption spectra. The light actually produced by nuclear fusion is continuous, but the atmosphere of the star selectively absorbs wavelengths, forming an absorption spectrum. This is used ...
The Sun and the Stars
... All reactions beyond Fe endothermic i.e. require more energy than they produce ...
... All reactions beyond Fe endothermic i.e. require more energy than they produce ...
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.