Formation and composition of planets around very low mass stars
... the planetary mass: planets that do not contain a lot of water are generally of lower mass (below ∼ 1M⊕ , although some can be as massive as ∼ 1.5M⊕ ), and planets totally devoid of water are all less massive than 1M⊕ , and even lower than 0.4M⊕ if one does not consider the massive disks. This can b ...
... the planetary mass: planets that do not contain a lot of water are generally of lower mass (below ∼ 1M⊕ , although some can be as massive as ∼ 1.5M⊕ ), and planets totally devoid of water are all less massive than 1M⊕ , and even lower than 0.4M⊕ if one does not consider the massive disks. This can b ...
Red supergiants and the past of Cygnus OB2
... supergiants abound, indicating that many stars in the association have already evolved away from the main sequence and that the main star-forming sites have been shifting with time. The study of this older component is made difficult by the effects of stellar evolution, and in particular by the fact ...
... supergiants abound, indicating that many stars in the association have already evolved away from the main sequence and that the main star-forming sites have been shifting with time. The study of this older component is made difficult by the effects of stellar evolution, and in particular by the fact ...
Script Chapter 7 part 2
... CHAPTER 7. PLANET FORMATION – the gas in the disk is assumed to move in quasi-Keplerian orbits and the specific ...
... CHAPTER 7. PLANET FORMATION – the gas in the disk is assumed to move in quasi-Keplerian orbits and the specific ...
The Formation of a Realistic Disk Galaxy in Lambda Dominated
... feedback and a redshift-dependent UV background. We compare results from a cold dark matter (CDM) simulation to a warm dark matter (WDM) (2 keV) simulation that forms significantly less small-scale structure. We show how high mass and force resolution in both the gas and dark-matter components ...
... feedback and a redshift-dependent UV background. We compare results from a cold dark matter (CDM) simulation to a warm dark matter (WDM) (2 keV) simulation that forms significantly less small-scale structure. We show how high mass and force resolution in both the gas and dark-matter components ...
Astronomy and the Coal Age of Alabama
... The sky is like a time machine. Light travels in vacuum at finite speed, 186,272 miles per second. In a year, a beam of light travels one light year, or 6 trillion miles. This means that the farther out in space we look, the farther back in time we see. The Minkin site is 310 Myr old. Sunlight that ...
... The sky is like a time machine. Light travels in vacuum at finite speed, 186,272 miles per second. In a year, a beam of light travels one light year, or 6 trillion miles. This means that the farther out in space we look, the farther back in time we see. The Minkin site is 310 Myr old. Sunlight that ...
PPT - Harvard-Smithsonian Center for Astrophysics
... Soft-failure – Bad weather or instrument breakdown are local phenomena, not fatal to an array ...
... Soft-failure – Bad weather or instrument breakdown are local phenomena, not fatal to an array ...
Dark Matter in the Universe
... a rough approximation, try to envision a typical spiral galaxy, such as our Milky Way, as a relatively flat, glowing disk embedded in a spherical halo of invisible material—almost like an extremely diffuse cloud. Looking at a single galaxy, astronomers see within the galaxy’s radius (a distance of a ...
... a rough approximation, try to envision a typical spiral galaxy, such as our Milky Way, as a relatively flat, glowing disk embedded in a spherical halo of invisible material—almost like an extremely diffuse cloud. Looking at a single galaxy, astronomers see within the galaxy’s radius (a distance of a ...
1. The "Q" word and its meaning
... Q1: Quenching and the cessation of star-formation 1. The "Q" word and its meaning a. Is quenching a good word to describe the end of star-formation in galaxies ? b. What are the timescale(s) for quenching? Pablo , Jarle c. Is quenching due to starvation or gas expulsion? Romeel 2. What do we learn f ...
... Q1: Quenching and the cessation of star-formation 1. The "Q" word and its meaning a. Is quenching a good word to describe the end of star-formation in galaxies ? b. What are the timescale(s) for quenching? Pablo , Jarle c. Is quenching due to starvation or gas expulsion? Romeel 2. What do we learn f ...
Abstracts - Space Telescope Science Institute
... regions and an intense nuclear starburst. The galaxy itself is a veritable supernova factory, having generated six known SNe in less than 100 years. Hence, one might expect of order 60 or more supernova remnants (SNRs) less than a thousand years old, as well as many older SNRs dominated by ISM emiss ...
... regions and an intense nuclear starburst. The galaxy itself is a veritable supernova factory, having generated six known SNe in less than 100 years. Hence, one might expect of order 60 or more supernova remnants (SNRs) less than a thousand years old, as well as many older SNRs dominated by ISM emiss ...
a comparison of methods for determining the molecular
... solve a number of problems that appeared in earlier models that omitted molecules. For example, in the high-redshift universe, absorption line surveys indicate that the star formation rate in damped Lyα systems must be significantly below what one would expect given their H i column densities if the ...
... solve a number of problems that appeared in earlier models that omitted molecules. For example, in the high-redshift universe, absorption line surveys indicate that the star formation rate in damped Lyα systems must be significantly below what one would expect given their H i column densities if the ...
http://www.lanl.gov/orgs/adtsc/publications/science_highlights_2013/docs/Pg24_25.pdf
... and SN1987A are being used to start a database of SN simulations that will eventually allow future observations to be matched to simulations much more easily. This database will eventually include SN simulations with various combinations of SN type, progenitor mass, metallicity, wind profile, explos ...
... and SN1987A are being used to start a database of SN simulations that will eventually allow future observations to be matched to simulations much more easily. This database will eventually include SN simulations with various combinations of SN type, progenitor mass, metallicity, wind profile, explos ...
Neistein_dekel60
... The history of one galaxy We follow all the particles, and check which got heated/cooled/SF/accreted ...
... The history of one galaxy We follow all the particles, and check which got heated/cooled/SF/accreted ...
No Slide Title
... • If the star has planets, the magnification pattern experienced by a background source is no longer circularly symmetric on the sky • The combined gravitational field of the star and planet can create strong deviations in the lensing pattern, called caustics – This means that the changes in the lig ...
... • If the star has planets, the magnification pattern experienced by a background source is no longer circularly symmetric on the sky • The combined gravitational field of the star and planet can create strong deviations in the lensing pattern, called caustics – This means that the changes in the lig ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... twice—once 1.9 billion years ago and again 0.9 billion years ago—and that it is now coming in for a third collision in just another 10 million years. Until recently, most investigators have been studying how the Milky Way’s tremendous gravitational field and tidal forces are ripping the Sagittarius ...
... twice—once 1.9 billion years ago and again 0.9 billion years ago—and that it is now coming in for a third collision in just another 10 million years. Until recently, most investigators have been studying how the Milky Way’s tremendous gravitational field and tidal forces are ripping the Sagittarius ...
Document
... that there was no differential rotation. Spot activity on F-type stars is not seen, but they do have a convection zone so DR is possible. ...
... that there was no differential rotation. Spot activity on F-type stars is not seen, but they do have a convection zone so DR is possible. ...
PRESS 2001 Project Report - Hong Kong University of Science and
... description on our project is provided. We also performed a simulation on a famous eclipsing binary, Algol, and compared it with the actual experimental result. ...
... description on our project is provided. We also performed a simulation on a famous eclipsing binary, Algol, and compared it with the actual experimental result. ...
Evolution of Population II Stars in the Helium
... Evolution of Population I stars with 15.6 M 0 4>, 5> and 4 M 0 6> in the heliumburning phase has been investigated taking into account the effect of helium depletion on the mean molecular weight and on the rate of helium burning. The results have shown that the stellar radius strongly depends not on ...
... Evolution of Population I stars with 15.6 M 0 4>, 5> and 4 M 0 6> in the heliumburning phase has been investigated taking into account the effect of helium depletion on the mean molecular weight and on the rate of helium burning. The results have shown that the stellar radius strongly depends not on ...
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.