Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
original version
... extreme values of (S)SFR, indicative of the most extreme starbursts, must occur in interacting galaxies. As shown in Table 1 of [7], many of these galaxies are early-types, including ellipticals. Their raw SFRs (not normalised by control sample) are sometimes, but not always, rather modest, but thei ...
... extreme values of (S)SFR, indicative of the most extreme starbursts, must occur in interacting galaxies. As shown in Table 1 of [7], many of these galaxies are early-types, including ellipticals. Their raw SFRs (not normalised by control sample) are sometimes, but not always, rather modest, but thei ...
Solutions
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
Astronomy Assignment #1
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
Thinking Outside the Sphere
... the sphere of the stars. The whole sphere was “a true cosmos or glorious world spangled…all over” with the stars. The starry sphere controlled the motion of the planets contained within it. In his Republic, this idea was part of a tale of a soldier, slain in battle, who returned to life while on his ...
... the sphere of the stars. The whole sphere was “a true cosmos or glorious world spangled…all over” with the stars. The starry sphere controlled the motion of the planets contained within it. In his Republic, this idea was part of a tale of a soldier, slain in battle, who returned to life while on his ...
... WAVELENGTH SURVEYS There is compelling observational evidence that much of the ongoing star formation in the young Universe is hidden from optical/UV surveys. For example, using a Lyman break color selection technique (Steidel et al. 1996), more than 3000 high z galaxies have been identified in grou ...
Electronic version
... held in Asia, coming a dozen years after one hosted by India in 1985. This fact may seem somewhat strange. It seems particularly remarkable to me as a Japanese person, given my country's recognized scientific contributions in the fields of theoretical astrophysics, space sciences (including X-ray as ...
... held in Asia, coming a dozen years after one hosted by India in 1985. This fact may seem somewhat strange. It seems particularly remarkable to me as a Japanese person, given my country's recognized scientific contributions in the fields of theoretical astrophysics, space sciences (including X-ray as ...
Astronomy and Astrophysics (ASTRO)
... systems discovered around other stars. General characteristics of ...
... systems discovered around other stars. General characteristics of ...
Clusters as laboratories for the study of galaxy evolution
... Velocity dispersions and optical photometry for 21 “early-type” galaxies in the Groth strip. “The difference in the degree of evolution between our field sample and published cluster galaxies suggests a more recent formation epoch, around z=1.5 for field galaxies compared to z>2.0 for cluster galaxi ...
... Velocity dispersions and optical photometry for 21 “early-type” galaxies in the Groth strip. “The difference in the degree of evolution between our field sample and published cluster galaxies suggests a more recent formation epoch, around z=1.5 for field galaxies compared to z>2.0 for cluster galaxi ...
Theory of Motion of Matter on the Formation of Galaxy and Star
... outwards primordial galaxy nebula center high density nuclear zone and dispersed matter, which has changed the motion direction of dispersed matter and made it move towards nebula center. Energy change occurs between primordial galaxy nebula center high density nuclear zone and dispersed matter, pro ...
... outwards primordial galaxy nebula center high density nuclear zone and dispersed matter, which has changed the motion direction of dispersed matter and made it move towards nebula center. Energy change occurs between primordial galaxy nebula center high density nuclear zone and dispersed matter, pro ...
transcript.
... ANDREA GHEZ: Our view to the center of the galaxy is absolutely superb. And our ability to position stars at the center of the galaxy is like somebody in Los Angeles seeing somebody in New York be able to move their fingers, like this, okay? Just two centimeters. That's the precision with which we c ...
... ANDREA GHEZ: Our view to the center of the galaxy is absolutely superb. And our ability to position stars at the center of the galaxy is like somebody in Los Angeles seeing somebody in New York be able to move their fingers, like this, okay? Just two centimeters. That's the precision with which we c ...
PDF only
... India is one of the most complex regions in terms of co-habitation of a wide varieties of tribal societies that include the entire spectrum, from lifestyles akin to early hunter-gatherers to the most modern aspects of human civilisation. Many of these cultures are broadly classified as tribal, and t ...
... India is one of the most complex regions in terms of co-habitation of a wide varieties of tribal societies that include the entire spectrum, from lifestyles akin to early hunter-gatherers to the most modern aspects of human civilisation. Many of these cultures are broadly classified as tribal, and t ...
GoldCreation
... One of my favorite astronomy-themed t-shirts says “You are star dust”. It makes the point that we are all made from long dead stars. Of course, everything around us is also made of star stuff. This even includes rare elements such as gold. This paper discusses the processes of gold formation. Most m ...
... One of my favorite astronomy-themed t-shirts says “You are star dust”. It makes the point that we are all made from long dead stars. Of course, everything around us is also made of star stuff. This even includes rare elements such as gold. This paper discusses the processes of gold formation. Most m ...
An Atlas of Stellar Spectra
... kinds: accurate color equivalents for many of the brighter stars and accurate absolute magnitudes for a number of the same stars. These results have been used to define the system of classification more precisely, both in the temperature equivalents and in the luminosity class. The most important of ...
... kinds: accurate color equivalents for many of the brighter stars and accurate absolute magnitudes for a number of the same stars. These results have been used to define the system of classification more precisely, both in the temperature equivalents and in the luminosity class. The most important of ...
Masses, Radii, and Equation of State of Neutron Stars
... Our understanding of neutron stars has changed drastically since the Annual Reviews article of Wheeler (1966), when not a single neutron star was known and the discussion consisted of an entirely theoretical treatment of collapsed dense stars. The change has been most rapid in the last decade, when ...
... Our understanding of neutron stars has changed drastically since the Annual Reviews article of Wheeler (1966), when not a single neutron star was known and the discussion consisted of an entirely theoretical treatment of collapsed dense stars. The change has been most rapid in the last decade, when ...
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.