Clusters: age scales for stellar physics
... were identified as the culprit (Bethe 1939). This is an important lesson: pieces which do not match in this enormous puzzle (our understanding of natural phenomena) do provide, eventually, very interesting hints for new avenues and discoveries. Age and related issues belong to this category. In the ...
... were identified as the culprit (Bethe 1939). This is an important lesson: pieces which do not match in this enormous puzzle (our understanding of natural phenomena) do provide, eventually, very interesting hints for new avenues and discoveries. Age and related issues belong to this category. In the ...
The redshift of extragalactic nebulae
... valid in the absence of absorption and scattering of light in space. However, the finding of a uniform distribution of nebulae up to the greatest attainable distances with a method that requires the virtual absence of absorption and scattering is, in itself almost a proof of the correctness of this ...
... valid in the absence of absorption and scattering of light in space. However, the finding of a uniform distribution of nebulae up to the greatest attainable distances with a method that requires the virtual absence of absorption and scattering is, in itself almost a proof of the correctness of this ...
exoplanet observing for amateurs
... status. Thus, cosmologists garnered the highest regard, and those who studied objects in our solar system were viewed with the least regard. My studies were of the moon, but I didn’t care where I was in this hierarchy. At that time there was only one level lower than mine: those who speculated about ...
... status. Thus, cosmologists garnered the highest regard, and those who studied objects in our solar system were viewed with the least regard. My studies were of the moon, but I didn’t care where I was in this hierarchy. At that time there was only one level lower than mine: those who speculated about ...
Multiwavelength properties of γ-ray loud binary systems.
... Contain an evolved star transferring mass onto a white dwarf, neutron star, or black hole ...
... Contain an evolved star transferring mass onto a white dwarf, neutron star, or black hole ...
IXO as an observatory in the large telescopes era
... density. Black dots represent black holes. Small, gas-rich galaxies merge in the deepest potential wells at high redshift, promoting star formation and black hole growth. At z~7 to z~5 a luminous quasar forms, associated with the most massive black hole. It drives a wind (yellow) that evacuates gas ...
... density. Black dots represent black holes. Small, gas-rich galaxies merge in the deepest potential wells at high redshift, promoting star formation and black hole growth. At z~7 to z~5 a luminous quasar forms, associated with the most massive black hole. It drives a wind (yellow) that evacuates gas ...
Introduction
... galaxies. In fact, galaxies with quenched star formation are typically gas deficient systems residing in the cluster environment, suggesting that environmental effects are responsible for removing the gas required to fuel star formation in these objects. A fraction of quenched late-type galaxies are ...
... galaxies. In fact, galaxies with quenched star formation are typically gas deficient systems residing in the cluster environment, suggesting that environmental effects are responsible for removing the gas required to fuel star formation in these objects. A fraction of quenched late-type galaxies are ...
The Life Cycle of Stars: Supernovae in Starbursts by Jason Kezwer
... rates and settling the debate between the dominant energy source in LIRGs: star formation or AGN activity. Both the deduced high star formation rate and far-IR luminosity of Arp 220 suggest an atypically high supernova rate of 1-4 per year, two orders of magnitude greater than that of the Milky Way. ...
... rates and settling the debate between the dominant energy source in LIRGs: star formation or AGN activity. Both the deduced high star formation rate and far-IR luminosity of Arp 220 suggest an atypically high supernova rate of 1-4 per year, two orders of magnitude greater than that of the Milky Way. ...
21_Testbank
... 2) Why are telescopes sometimes called "time machines"? A) because the author, H.G. Wells, used the term to describe telescopes in a book B) because some of the oldest telescopes are still in use today C) because observations of distant objects reveal them as they were in the past D) because astrono ...
... 2) Why are telescopes sometimes called "time machines"? A) because the author, H.G. Wells, used the term to describe telescopes in a book B) because some of the oldest telescopes are still in use today C) because observations of distant objects reveal them as they were in the past D) because astrono ...
Digital Universe Guide - American Museum of Natural History
... night sky as seen from Earth. With the left mouse button pressed, you can pan around the sky to your heart’s content. How do you move away from the Sun, though, and begin flying around the stars? Turn on the stars and turn off the open clusters and globular clusters (click on their group buttons). B ...
... night sky as seen from Earth. With the left mouse button pressed, you can pan around the sky to your heart’s content. How do you move away from the Sun, though, and begin flying around the stars? Turn on the stars and turn off the open clusters and globular clusters (click on their group buttons). B ...
Stars, Galaxies, and Beyond
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
PHY216_lect3_2014_sub
... 1) Express the date as y m d, where y is the year, m is the month number (Jan = 1, Feb = 2, etc.), and d is the day in the month. 2) If the month is January or February, subtract 1 from the year to get a new y, and add 12 to the month to get a new m. (This is because we consider January and February ...
... 1) Express the date as y m d, where y is the year, m is the month number (Jan = 1, Feb = 2, etc.), and d is the day in the month. 2) If the month is January or February, subtract 1 from the year to get a new y, and add 12 to the month to get a new m. (This is because we consider January and February ...
365 days of SKYWATCHING
... the largest of telescopes cannot compensate for poor viewing conditions! The outer planets - Uranus, Neptune and Pluto - also follow the ecliptic ...
... the largest of telescopes cannot compensate for poor viewing conditions! The outer planets - Uranus, Neptune and Pluto - also follow the ecliptic ...
Ages of young stars
... are combinations of theoretical uncertainties and observational uncertainties associated with estimating the luminosity of the LDB. Contributing to the latter are distance estimates, reddening and bolometric corrections (for stellar luminosity not in the band observed), but these are usually small c ...
... are combinations of theoretical uncertainties and observational uncertainties associated with estimating the luminosity of the LDB. Contributing to the latter are distance estimates, reddening and bolometric corrections (for stellar luminosity not in the band observed), but these are usually small c ...
diy astronomy - American Museum of Natural History
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
Ages of Young Stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
GAIA A Stereoscopic Census of our Galaxy
... The GAIA Space Mission: Observational Principles and Scientific ...
... The GAIA Space Mission: Observational Principles and Scientific ...
FIELD ASTRONOMY
... (2) Longitude. Other planes were passed through the earth so they intersect at both poles. The lines these planes inscribe on the surface of the sphere are called meridians of longitude. A baseline for measurement was established with the meridian that passed through Greenwich, England, and was give ...
... (2) Longitude. Other planes were passed through the earth so they intersect at both poles. The lines these planes inscribe on the surface of the sphere are called meridians of longitude. A baseline for measurement was established with the meridian that passed through Greenwich, England, and was give ...
Zapartas_deMink_Izzard_AA_2017
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
The Young Stars
... In 1945, Alfred Joy classified a group of 11 stars as ‘T Tauri variables’, named after the prototype discovered in the constellation of Taurus. They displayed erratic optical variability, strong chromospheric lines and could be identified through their strong Hα emission lines. They were found to co ...
... In 1945, Alfred Joy classified a group of 11 stars as ‘T Tauri variables’, named after the prototype discovered in the constellation of Taurus. They displayed erratic optical variability, strong chromospheric lines and could be identified through their strong Hα emission lines. They were found to co ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... straggler) members, the cluster harbors four or five sdB/O stars (Liebert, Saffer, & Green 1994) whose membership is likely given their spatial concentration towards the cluster center (Kaluzny & Udalski 1992). Hot, metal-rich BHB stars also appear to be present in metal-rich extragalactic systems. ...
... straggler) members, the cluster harbors four or five sdB/O stars (Liebert, Saffer, & Green 1994) whose membership is likely given their spatial concentration towards the cluster center (Kaluzny & Udalski 1992). Hot, metal-rich BHB stars also appear to be present in metal-rich extragalactic systems. ...
structure and evolution of white dwarfs and their
... Theoretical and observational study of stellar evolution has placed white dwarfs as one possible end point of the process. In general terms, all stars with masses below about eight times that of the Sun will pass through one or more red giant phases before losing most of their original mass to form ...
... Theoretical and observational study of stellar evolution has placed white dwarfs as one possible end point of the process. In general terms, all stars with masses below about eight times that of the Sun will pass through one or more red giant phases before losing most of their original mass to form ...
Observational studies of stellar rotation
... months to years (e.g. Affer et al. 2012; McQuillan et al. 2013). The large number of rotational cycles recorded by these light curves allows not only the stellar rotational period to be derived with extreme accuracy but also to detect latitudinal differential rotation by traking spots located at dif ...
... months to years (e.g. Affer et al. 2012; McQuillan et al. 2013). The large number of rotational cycles recorded by these light curves allows not only the stellar rotational period to be derived with extreme accuracy but also to detect latitudinal differential rotation by traking spots located at dif ...
The white dwarf population within 40 pc of the Sun
... evolution of white dwarfs is determined by a simple gravothermal process. However, although the basic picture of white dwarf evolution has remained unchanged for some time, we now have very reliable and accurate evolutionary tracks, which take into account all the relevant physical processes involve ...
... evolution of white dwarfs is determined by a simple gravothermal process. However, although the basic picture of white dwarf evolution has remained unchanged for some time, we now have very reliable and accurate evolutionary tracks, which take into account all the relevant physical processes involve ...
Asteroid Rotation Periods
... Asteroids are small solid bodies, typically about a few kms large, that orbit the Sun between Mars and Jupiter (most of them occupy the region around 2,5AU), which is often called the asteroid belt. The name asteroid is of Greek origin and means ‘kind of a star’, or better put ‘looks like a star’. T ...
... Asteroids are small solid bodies, typically about a few kms large, that orbit the Sun between Mars and Jupiter (most of them occupy the region around 2,5AU), which is often called the asteroid belt. The name asteroid is of Greek origin and means ‘kind of a star’, or better put ‘looks like a star’. T ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.