GALEX and Star Formation
... (e.g. Mathis 1994). In the LMC’s mini-starburst region LMC 2 the far-UV extinction is UV-steeper, and has a smaller 2175Å “bump”, than the Galaxy and other LMC locations (e.g. Misselt et al. 1999). The UV extinction is even steeper in the SMC. In M31 sightlines we found a MW-type curve but possibly ...
... (e.g. Mathis 1994). In the LMC’s mini-starburst region LMC 2 the far-UV extinction is UV-steeper, and has a smaller 2175Å “bump”, than the Galaxy and other LMC locations (e.g. Misselt et al. 1999). The UV extinction is even steeper in the SMC. In M31 sightlines we found a MW-type curve but possibly ...
Galactic Chemical Evolution and the Oxygen Isotopic Composition
... Nearly all models of O-isotopic GCE adopt the Instantaneous Mixing Approximation (IMA), which assumes that the ISM consists of a single homogeneous reservoir. The IMA cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix ef ...
... Nearly all models of O-isotopic GCE adopt the Instantaneous Mixing Approximation (IMA), which assumes that the ISM consists of a single homogeneous reservoir. The IMA cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix ef ...
The Birdseed Galaxy - Secondary Education
... seeds, if we just put them in one place. Ask students or the audience what they think (they should be looking at their package of bird seed while doing their estimate). If they are stuck, you might ask: Would 200 billion bird seeds fill their desk or their classroom? Would it be as big as the gym in ...
... seeds, if we just put them in one place. Ask students or the audience what they think (they should be looking at their package of bird seed while doing their estimate). If they are stuck, you might ask: Would 200 billion bird seeds fill their desk or their classroom? Would it be as big as the gym in ...
A galaxy rapidly forming stars 700 million years after the Big Bang at
... that a typical galaxy at z < 7 has SFR 5 10 M[ yr21; the measured SFR of z8_GND_5296 is a factor of more than 30 times greater. If this SFR function is accurate, the expected space density per co-moving Mpc3 for this galaxy would be =1025. The implied rarity of this galaxy could indicate that it is ...
... that a typical galaxy at z < 7 has SFR 5 10 M[ yr21; the measured SFR of z8_GND_5296 is a factor of more than 30 times greater. If this SFR function is accurate, the expected space density per co-moving Mpc3 for this galaxy would be =1025. The implied rarity of this galaxy could indicate that it is ...
- Cosmotography
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
Spiral structure of the Third Galactic Quadrant and the solution to the
... others deserves a closer look. The photometric analysis presented in other studies were exclusively limited to CMDs. It is well known that the determination of fundamental parameters - reddening, distance, age and metallicity - is affected by a number of degeneracies (that are readily admitted by th ...
... others deserves a closer look. The photometric analysis presented in other studies were exclusively limited to CMDs. It is well known that the determination of fundamental parameters - reddening, distance, age and metallicity - is affected by a number of degeneracies (that are readily admitted by th ...
NuSeti-2015 - Department of Physics and Astronomy
... periodic with similar characteristics as Cepheids. They are smaller and less luminous , and so difficult to see at large distances or outside our galaxy, but more numerous, and found in Globular clusters . They are also candidates for being modulated by ETI………. Many such stars show complicated time ...
... periodic with similar characteristics as Cepheids. They are smaller and less luminous , and so difficult to see at large distances or outside our galaxy, but more numerous, and found in Globular clusters . They are also candidates for being modulated by ETI………. Many such stars show complicated time ...
MASSIVE CLOSE BINARIES
... that Case B is the more frequent class of interacting binaries. Compared to Case B, it is trivial to understand that Case A components have smaller final masses whereas it is obvious that Case C (and non-interacting) binaries are similar to single stars. Equation 1 decides upon the mass loss during ...
... that Case B is the more frequent class of interacting binaries. Compared to Case B, it is trivial to understand that Case A components have smaller final masses whereas it is obvious that Case C (and non-interacting) binaries are similar to single stars. Equation 1 decides upon the mass loss during ...
Slide 1
... The inner edge of a MS debris disc can be sculpted by a planet.star planet clears chaotic zone ...
... The inner edge of a MS debris disc can be sculpted by a planet.star planet clears chaotic zone ...
Ch. 25 - UTK Department of Physics and Astronomy
... they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies; many appear to be involved in collisions. ...
... they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies; many appear to be involved in collisions. ...
L103 A NEW MILKY WAY DWARF SATELLITE IN CANES
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
... of the Milky Way. Together with the two dwarf irregulars (the Large and Small Magellanic Clouds), these make up all the known satellite galaxies of the Milky Way. The dSphs have such low surface brightness that they have often been found serendipitously. For example, while Sextans (Irwin et al. 1990 ...
Which Constellation is Which?
... When you look up at the sky, you may see shapes. Ancient stargazers created these shapes. They are the constellations. They are named after people, animals, and things that were important to them You can use a star chart that shows where stars appear in the sky. As the night passes, these shapes see ...
... When you look up at the sky, you may see shapes. Ancient stargazers created these shapes. They are the constellations. They are named after people, animals, and things that were important to them You can use a star chart that shows where stars appear in the sky. As the night passes, these shapes see ...
Pulsars
... • From exclusion principle, each allowed energy state can be occupied by no more than two particles of opposite spin • Electrons in a White Dwarf occupy a small volume and have very well defined positions – hence from uncertainty principle, they have large momentum/energy and generate a high pressur ...
... • From exclusion principle, each allowed energy state can be occupied by no more than two particles of opposite spin • Electrons in a White Dwarf occupy a small volume and have very well defined positions – hence from uncertainty principle, they have large momentum/energy and generate a high pressur ...
Geoscience Astronomy Formative on Stellar Evolution and
... 25. Which of the following indicates that the universe is expanding? a. red shift of distant galaxies b. red shift of the galaxies in the Local Group c. blue shift of distant galaxies d. blue shift of the Milky Way 26. According to the big bang theory, the universe began about ____. a. 4.5 billion y ...
... 25. Which of the following indicates that the universe is expanding? a. red shift of distant galaxies b. red shift of the galaxies in the Local Group c. blue shift of distant galaxies d. blue shift of the Milky Way 26. According to the big bang theory, the universe began about ____. a. 4.5 billion y ...
Spectroscopic confirmation of a galaxy at redshift z=8.6
... a metal-poor stellar population given by a Scalo initial mass function26. Our other initial mass function is the one that only contains massive stars, .100M[, which have zero metallicity18. For this top-heavy initial mass function, we only considered ages of 10 and 100 Myr because it is unrealistic ...
... a metal-poor stellar population given by a Scalo initial mass function26. Our other initial mass function is the one that only contains massive stars, .100M[, which have zero metallicity18. For this top-heavy initial mass function, we only considered ages of 10 and 100 Myr because it is unrealistic ...
Carbon Enhanced Stars in the Sloan Digital Sky Survey ( SDSS )
... Now we are ready for the science From the SDSS spectra 1. [C/Fe] versus [Fe/H] 2. [alpha/Fe] versus [Fe/H] 3. s-process and C abundance 4. relative frequency of s-process rich and no n- enrichment How they are distributed in metallicity ...
... Now we are ready for the science From the SDSS spectra 1. [C/Fe] versus [Fe/H] 2. [alpha/Fe] versus [Fe/H] 3. s-process and C abundance 4. relative frequency of s-process rich and no n- enrichment How they are distributed in metallicity ...
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.