Discovery probability of transiting extragalactic planets and
... presence of the planet. The radius of the star’s orbit around the center of mass is so small(due to the greater mass) consequently the velocity of the star around the system’s center of mass is much smaller than that of the planet. However, velocity variations down to 0.5 m/s or even somewhat less c ...
... presence of the planet. The radius of the star’s orbit around the center of mass is so small(due to the greater mass) consequently the velocity of the star around the system’s center of mass is much smaller than that of the planet. However, velocity variations down to 0.5 m/s or even somewhat less c ...
Five New Giant Exoplanets from the California
... observationally and theoretically, yielding extraordinary information about their chemical composition, internal structure, atmospheric behavior. However most known gas giant planets orbit beyond 1 AU, realizing the population that formed beyond the ice line as predicted by theory, and as seen in ou ...
... observationally and theoretically, yielding extraordinary information about their chemical composition, internal structure, atmospheric behavior. However most known gas giant planets orbit beyond 1 AU, realizing the population that formed beyond the ice line as predicted by theory, and as seen in ou ...
Rotation - Indiana University Astronomy
... – X-ray emission also seen among higher mass stars (2-10 Msun) • Origin is likely similar to lower mass PMS stars ...
... – X-ray emission also seen among higher mass stars (2-10 Msun) • Origin is likely similar to lower mass PMS stars ...
Gaia - STScI
... Bright stars will give rigid tie between LSST and Gaia. Faint stars (down to 26th and beyond) will deliver the new science. Gaia has 2 fields of regard in same focal plane. At some star density, confusion will degrade accuracy. LSST has bigger images but a single field of regard. LSST can do differe ...
... Bright stars will give rigid tie between LSST and Gaia. Faint stars (down to 26th and beyond) will deliver the new science. Gaia has 2 fields of regard in same focal plane. At some star density, confusion will degrade accuracy. LSST has bigger images but a single field of regard. LSST can do differe ...
Chapter 24
... of sight. Consider, for example, a spherical galaxy, a cigarshaped galaxy seen end on, and a lozenge-shaped galaxy seen face on; all would appear circular in the sky. As a result, it is often difficult to decipher a galaxy’s true shape from its visual appearance. There is a large range in both the s ...
... of sight. Consider, for example, a spherical galaxy, a cigarshaped galaxy seen end on, and a lozenge-shaped galaxy seen face on; all would appear circular in the sky. As a result, it is often difficult to decipher a galaxy’s true shape from its visual appearance. There is a large range in both the s ...
The self-enrichment of galactic halo globular clusters: a clue to their
... by Brown et al. within the context of the Fall and Rees theory. Following Jehin et al., thick disk and field halo stars were born in globular clusters from which they escaped either during an early disruption of the proto-globular cluster (Pop IIa) or through a later disruption or evaporation proces ...
... by Brown et al. within the context of the Fall and Rees theory. Following Jehin et al., thick disk and field halo stars were born in globular clusters from which they escaped either during an early disruption of the proto-globular cluster (Pop IIa) or through a later disruption or evaporation proces ...
Reference PDF document
... From a visual point of view, the phenomenon of the transit of Venus is similar to Mercury’s: Venus is visible as a black circle moving slowly over the brilliant solar disk. The transit of Venus lasts a maximum of 8 hours. During the transit, Venus has a very small apparent diameter. However, it is c ...
... From a visual point of view, the phenomenon of the transit of Venus is similar to Mercury’s: Venus is visible as a black circle moving slowly over the brilliant solar disk. The transit of Venus lasts a maximum of 8 hours. During the transit, Venus has a very small apparent diameter. However, it is c ...
P7 Further Physics
... Measuring distance using brightness When I look at these stars some appear brighter than others. This because they are either brighter stars or closer to me. For example, the star Antares is 10,000 times brighter than the sun but it is 500 light years away from me, so it is only the 15th brightest s ...
... Measuring distance using brightness When I look at these stars some appear brighter than others. This because they are either brighter stars or closer to me. For example, the star Antares is 10,000 times brighter than the sun but it is 500 light years away from me, so it is only the 15th brightest s ...
physics class 11 chapter 2 ncert
... The principle of ‘parallax’ in section 2.3.1 is used in the determination of distances of very distant stars. The baseline AB is the line joining the Earth’s two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth’s orbit ≈ 3 × 1011m. Howe ...
... The principle of ‘parallax’ in section 2.3.1 is used in the determination of distances of very distant stars. The baseline AB is the line joining the Earth’s two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth’s orbit ≈ 3 × 1011m. Howe ...
tr-2004-81
... Brightness is measured in specific wavelength intervals of light using standard filters. Color is the difference in brightness through two different filters. Due to the Hubble expansion of the Universe, the Doppler redshift of light from a galaxy is a surrogate for its distance from Earth. Galaxy cl ...
... Brightness is measured in specific wavelength intervals of light using standard filters. Color is the difference in brightness through two different filters. Due to the Hubble expansion of the Universe, the Doppler redshift of light from a galaxy is a surrogate for its distance from Earth. Galaxy cl ...
ms
... would provide an important test for the methods’ consistency. For that purpose, X-ray bursters that are also transient sources, such as SAX J1748.9−2021, can be very useful. SAX J1748.9−2021 has been in quiescence since its last outburst in 2005. During this time interval, the Chandra X-ray Observat ...
... would provide an important test for the methods’ consistency. For that purpose, X-ray bursters that are also transient sources, such as SAX J1748.9−2021, can be very useful. SAX J1748.9−2021 has been in quiescence since its last outburst in 2005. During this time interval, the Chandra X-ray Observat ...
The Kinematics of Star Formation: Theory and Observation in the
... of the cluster are able to accrete more mass because of their location at the deepest point in the cluster potential. These cores are therefore more likely to grow to become the most massive stars in the cluster. Competitive accretion therefore predicts that the most massive stars should form at th ...
... of the cluster are able to accrete more mass because of their location at the deepest point in the cluster potential. These cores are therefore more likely to grow to become the most massive stars in the cluster. Competitive accretion therefore predicts that the most massive stars should form at th ...
A Novel Test of the Modified Newtonian Dynamics with Gas Rich
... One striking fact about extragalactic systems is that they are many orders of magnitude larger than the solar system in which conventional dynamics is extraordinarily well tested. One idea is thus to modify gravity on some suitably large length scale such that the apparent need for dark matter would ...
... One striking fact about extragalactic systems is that they are many orders of magnitude larger than the solar system in which conventional dynamics is extraordinarily well tested. One idea is thus to modify gravity on some suitably large length scale such that the apparent need for dark matter would ...
Galaxy Redshift Surveys (obj)
... – numerically feasible convex problem (Augmented Lagrange Multiplier) ...
... – numerically feasible convex problem (Augmented Lagrange Multiplier) ...
The white dwarf cooling sequence of 47 Tucanae
... Synthetic main-sequence stars are randomly drawn according to the initial mass function of Kroupa et al. (1993). The selected range of masses is that necessary to produce the white dwarf progenitors of 47 Tuc. In particular, a lower limit of M > 0.5 M guarantees that enough white dwarfs are produce ...
... Synthetic main-sequence stars are randomly drawn according to the initial mass function of Kroupa et al. (1993). The selected range of masses is that necessary to produce the white dwarf progenitors of 47 Tuc. In particular, a lower limit of M > 0.5 M guarantees that enough white dwarfs are produce ...
Extending the Supermassive Black Hole Mass
... Another major development of the past halfcentury has been the discovery and characterization of radio-loud and radio-quiet quasars, Seyfert galaxies, and other classes of objects that are collectively referred to as active galactic nuclei (AGN). Although AGN properties vary widely from class to Fig ...
... Another major development of the past halfcentury has been the discovery and characterization of radio-loud and radio-quiet quasars, Seyfert galaxies, and other classes of objects that are collectively referred to as active galactic nuclei (AGN). Although AGN properties vary widely from class to Fig ...
Nearest Neighbor Queries - UMD Department of Computer Science
... used extensively in the areas of arti cial intelligence and operations research [HS78]. If the ordering and pruning heuristics are chosen well, they can signi cantly reduce the number of nodes visited in a large search space. Search Ordering: The heuristics we use in our algorithm and in the followi ...
... used extensively in the areas of arti cial intelligence and operations research [HS78]. If the ordering and pruning heuristics are chosen well, they can signi cantly reduce the number of nodes visited in a large search space. Search Ordering: The heuristics we use in our algorithm and in the followi ...
A hypervelocity star from the Large Magellanic Cloud
... initial velocity between the binary and the single star as the total energy of the system is dominated by the binding energy of the binary rather than by the kinetic energy of the incoming star. Additional experiments performed with initial velocities of 5 and 10 km s−1 showed no appreciable differe ...
... initial velocity between the binary and the single star as the total energy of the system is dominated by the binding energy of the binary rather than by the kinetic energy of the incoming star. Additional experiments performed with initial velocities of 5 and 10 km s−1 showed no appreciable differe ...
AMUSE-Virgo AGN Multi-wavelength Survey
... prolonged periods of low-level SMBH activity needed in order to reproduce the galaxies’ colors (`radio mode’, Croton et al. 06). ...
... prolonged periods of low-level SMBH activity needed in order to reproduce the galaxies’ colors (`radio mode’, Croton et al. 06). ...
Gamma-Ray Line Emission from Radioactive Isotopes in Stars and
... and difficulties. We discuss their nature briefly, addressing a few of the physical aspects involved. The treatment of convection, and its implications, constitute one problem area common to several source types. The convective coupling between mass zones in both the oxygen-neon and hydrogen shell-b ...
... and difficulties. We discuss their nature briefly, addressing a few of the physical aspects involved. The treatment of convection, and its implications, constitute one problem area common to several source types. The convective coupling between mass zones in both the oxygen-neon and hydrogen shell-b ...
Supernovae - University of Texas Astronomy Home Page
... attention was paid to discovering supernovae after supernova 1987A, and the current rate of discovery is about 100 per year. Many of these supernovae are so distant and so faint that scant useful data are obtained from them, but special programs have yielded good data on very distant supernovae. Thi ...
... attention was paid to discovering supernovae after supernova 1987A, and the current rate of discovery is about 100 per year. Many of these supernovae are so distant and so faint that scant useful data are obtained from them, but special programs have yielded good data on very distant supernovae. Thi ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.