Astrometry of Asteroids
... many stars in it, scattered all over the sky, that you can practically count on having several GSC stars with known coordinates anywhere you look in the sky. On the other hand, there are so few stars in the FK5 Catalog, that it’s rare that a FK5 star will be in the same direction as an object of int ...
... many stars in it, scattered all over the sky, that you can practically count on having several GSC stars with known coordinates anywhere you look in the sky. On the other hand, there are so few stars in the FK5 Catalog, that it’s rare that a FK5 star will be in the same direction as an object of int ...
Thinking Outside the Sphere
... The globe of the earth is illustrated with the figures of Adam and Eve in the Garden of Eden; the narrative of Creation in Genesis is represented by the fish of the sea and birds of the air. The sun, moon, and planets created on the fourth day are shown in the middle region. The thin sphere of the f ...
... The globe of the earth is illustrated with the figures of Adam and Eve in the Garden of Eden; the narrative of Creation in Genesis is represented by the fish of the sea and birds of the air. The sun, moon, and planets created on the fourth day are shown in the middle region. The thin sphere of the f ...
Explosive sources of the highest energy radiation
... the nova ejecta shell expanding outwards and colliding with the stellar wind of the red giant companion and forming a shock front where particles could be accelerated to high energies. The line connecting the white dwarf with the donor star contains the largest local density enhancement attributable ...
... the nova ejecta shell expanding outwards and colliding with the stellar wind of the red giant companion and forming a shock front where particles could be accelerated to high energies. The line connecting the white dwarf with the donor star contains the largest local density enhancement attributable ...
Gamma Ray Burst Afterglows and Host Galaxies
... • Most classes of astronomical object can be studied at a range of wavelengths. For 24 years GRBs were an exception. • Difficulties due to the difficulty of deriving accurate positions from gamma rays, especially in short times. • Potential payoff… Large, as we shall see. ...
... • Most classes of astronomical object can be studied at a range of wavelengths. For 24 years GRBs were an exception. • Difficulties due to the difficulty of deriving accurate positions from gamma rays, especially in short times. • Potential payoff… Large, as we shall see. ...
Chapter 14 Black Holes as Central Engines
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
arXiv:astro-ph/0701557v1 19 Jan 2007
... We investigate the stellar populations in the star forming ring of the luminous infrared galaxy NGC 7469. We use Hubble Space Telescope multi-wavelength (UV through NIR) imaging complemented with new K-band ground-based long-slit spectroscopy, and mid-IR and radio maps from the literature. Spectral ...
... We investigate the stellar populations in the star forming ring of the luminous infrared galaxy NGC 7469. We use Hubble Space Telescope multi-wavelength (UV through NIR) imaging complemented with new K-band ground-based long-slit spectroscopy, and mid-IR and radio maps from the literature. Spectral ...
The Swift satellite lives up to its name, revealing cosmic
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
Evolution of Circumstellar Disks Around Normal Stars
... Over the past 10 years abundant evidence has emerged that many (if not all) stars are born with circumstellar disks. Understanding the evolution of post–accretion disks can provide strong constraints on theories of planet formation and evolution. In this review, we focus on developments in understan ...
... Over the past 10 years abundant evidence has emerged that many (if not all) stars are born with circumstellar disks. Understanding the evolution of post–accretion disks can provide strong constraints on theories of planet formation and evolution. In this review, we focus on developments in understan ...
TOPS: Toward Other Planetary
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
Mid-IR Spectra of IRAS 20343+4129 IRS 1 and IRS 3 M.F. Campbell
... mapped both continuum emission at 12.8 m and the [Ne II] line for IRS 3 (Fig. 4). We interpret our low resolution spectra and photometry with simple models that have two emitting dust cloud components (each with constant temperature and density), and an overlying absorbing cloud component. The mode ...
... mapped both continuum emission at 12.8 m and the [Ne II] line for IRS 3 (Fig. 4). We interpret our low resolution spectra and photometry with simple models that have two emitting dust cloud components (each with constant temperature and density), and an overlying absorbing cloud component. The mode ...
Quantitative constraints on starburst cycles in galaxies with stellar
... fiber aperture are also available from these catalogues. The reader is referred to Brinchmann et al. (2004) for a detailed description of how SFRs are derived. Briefly, star formation rates are estimated by fitting a grid of photo-ionization models to the observed [OIII], Hβ, Hα and [NII] line stren ...
... fiber aperture are also available from these catalogues. The reader is referred to Brinchmann et al. (2004) for a detailed description of how SFRs are derived. Briefly, star formation rates are estimated by fitting a grid of photo-ionization models to the observed [OIII], Hβ, Hα and [NII] line stren ...
The Milky Way disk
... et al., 2014). They derived full abundance analysis for a sample of only 740 F and G dwarfs out of spectra with resolution in the range R=40,000-110,000 and high signal-to-noise ratio (150-300). The sample was carefully built up to trace stellar populations along a wide range in metallicity, which p ...
... et al., 2014). They derived full abundance analysis for a sample of only 740 F and G dwarfs out of spectra with resolution in the range R=40,000-110,000 and high signal-to-noise ratio (150-300). The sample was carefully built up to trace stellar populations along a wide range in metallicity, which p ...
The Birth Environment of the Solar System
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
course objectives - Metropolitan Community College
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
Altair -- the ``hottest`` magnetically active star in X-rays
... brightness during our 2 × 2 exposures, that are separated by 14 days and cover in total roughly 35 h of observation time. In Fig. 1 we show the count rate in the 0.2–2.0 keV band as measured by the EPIC, i.e. summed PN and MOS, instrument in time-steps of half an hour. While clearly no strong flares ...
... brightness during our 2 × 2 exposures, that are separated by 14 days and cover in total roughly 35 h of observation time. In Fig. 1 we show the count rate in the 0.2–2.0 keV band as measured by the EPIC, i.e. summed PN and MOS, instrument in time-steps of half an hour. While clearly no strong flares ...
10-Jets and outflows
... associated with high mass stars. The outflows were found to be split into two lobes, one on each side of the young stellar object. Most significantly, the material on one side was found to be predominantly blue shifted and on the opposite side red shifted. This, in itself, does not require the gas t ...
... associated with high mass stars. The outflows were found to be split into two lobes, one on each side of the young stellar object. Most significantly, the material on one side was found to be predominantly blue shifted and on the opposite side red shifted. This, in itself, does not require the gas t ...
On the elemental abundance and isotopic mixture of mercury in
... on the behaviour of the Hg λ3984 line, but the latter two studied the Hg λ4358 line in selected stars. Smith (1997) also included a low-resolution study of Hg λ1942 using data from the International Ultraviolet Explorer (IUE) satellite. High-resolution ultraviolet studies of additional mercu ...
... on the behaviour of the Hg λ3984 line, but the latter two studied the Hg λ4358 line in selected stars. Smith (1997) also included a low-resolution study of Hg λ1942 using data from the International Ultraviolet Explorer (IUE) satellite. High-resolution ultraviolet studies of additional mercu ...
Determination of accurate stellar radial
... observations were made 1997 in two separate runs on February 18–23 and October 15–23. The campaign targeted mainly stars in the Hyades and Ursa Major open clusters, but also included a set of IAU radial-velocity standards, some low-metallicity stars, Procyon and 51 Peg. Lunar spectra were also obtai ...
... observations were made 1997 in two separate runs on February 18–23 and October 15–23. The campaign targeted mainly stars in the Hyades and Ursa Major open clusters, but also included a set of IAU radial-velocity standards, some low-metallicity stars, Procyon and 51 Peg. Lunar spectra were also obtai ...
the next decade - Lowell Observatory
... Middelkoop derived a color-dependent factor Ccf that removes the color term from S, thus making measurements for different stars directly comparable. (He also provided a prescription for then converting the color-corrected S to flux F; more on this below). The Harvard group extended Middelkoop’s rel ...
... Middelkoop derived a color-dependent factor Ccf that removes the color term from S, thus making measurements for different stars directly comparable. (He also provided a prescription for then converting the color-corrected S to flux F; more on this below). The Harvard group extended Middelkoop’s rel ...
ALMA Science Results
... – One needs a better measure of mass—for most objects only a limit could be established – Excellent prospects for measuring BH masses dynamically ...
... – One needs a better measure of mass—for most objects only a limit could be established – Excellent prospects for measuring BH masses dynamically ...
The Perseid Meteor Shower
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.