Resultados del Concurso 2008A para Observaciones en
... Resumen: Planets and brown dwarfs in close orbits around main sequence stars will inevitably interact with their stellar hosts once they ascend the red giant branch. The details and outcomes of these interactions are currently unclear. Recent discoveries of brown dwarfs and planets orbiting post-red ...
... Resumen: Planets and brown dwarfs in close orbits around main sequence stars will inevitably interact with their stellar hosts once they ascend the red giant branch. The details and outcomes of these interactions are currently unclear. Recent discoveries of brown dwarfs and planets orbiting post-red ...
“And God Said, Let There Be Lights in the Firmament of Heaven”
... for reasons not fully understood the sun reaches a minimum temperature just outside its visual surface from that minimum of about 4500 degrees centigrade the temperature of the gas around the sun climbs rapidly to a million plus degrees centigrade this hot gas surrounds the sun in a tenuous corona w ...
... for reasons not fully understood the sun reaches a minimum temperature just outside its visual surface from that minimum of about 4500 degrees centigrade the temperature of the gas around the sun climbs rapidly to a million plus degrees centigrade this hot gas surrounds the sun in a tenuous corona w ...
Publisher: Emily Barrosse Acquisitions Editor: Kelley Tyner
... a shell of gas. Or perhaps they drift off gradually and a second round of gas comes off at a more rapid pace. This second round of gas plows into the first round, creating a visible shell (Fig. 13–2). Each of these two models has its proponents, and observations are being carried out to discover whi ...
... a shell of gas. Or perhaps they drift off gradually and a second round of gas comes off at a more rapid pace. This second round of gas plows into the first round, creating a visible shell (Fig. 13–2). Each of these two models has its proponents, and observations are being carried out to discover whi ...
Exam 2
... expanding nebula merges with the interstellar medium – the gas filling the space between the stars – and enriches it with these heavy elements. This is the primary process by which matter returns from stars to interstellar space. Planetary nebulae cannot be seen with the naked eye. Indeed, the study ...
... expanding nebula merges with the interstellar medium – the gas filling the space between the stars – and enriches it with these heavy elements. This is the primary process by which matter returns from stars to interstellar space. Planetary nebulae cannot be seen with the naked eye. Indeed, the study ...
Data-mining in astrophysics. A search for new variable stars in
... In all existing studies based on NSVS, the search for periodic variables by Fourier analysis is performed at a later stage, after applying the other criteria to substantially reduce the number of variable star candidates. The reason is that Fourier analysis takes much computer time, always false per ...
... In all existing studies based on NSVS, the search for periodic variables by Fourier analysis is performed at a later stage, after applying the other criteria to substantially reduce the number of variable star candidates. The reason is that Fourier analysis takes much computer time, always false per ...
Paul Green - Chandra X-Ray Observatory (CXC)
... Topics include individual Galactic XRBs, NS and BH theory, populations Still developing workshop website ...
... Topics include individual Galactic XRBs, NS and BH theory, populations Still developing workshop website ...
Chapter 25 - Haiku Learning
... Red stars are much cooler, and most of their energy is emitted as longer-wavelength red light. Stars with temperatures between 5000 and 6000 K appear yellow, like the sun. ...
... Red stars are much cooler, and most of their energy is emitted as longer-wavelength red light. Stars with temperatures between 5000 and 6000 K appear yellow, like the sun. ...
Signatures of the first stars in the 21cm Emission and Absorption
... • Each metal-free star can produce about 105 ionizing photons per baryon it contains, creating an HII region of ~ 107 Msun of gas, of physical radius ~ 1 kpc at z=30. Probably only one metal-free star forms per halo. • Star formation occurring after the HII region recombines and merges is probably f ...
... • Each metal-free star can produce about 105 ionizing photons per baryon it contains, creating an HII region of ~ 107 Msun of gas, of physical radius ~ 1 kpc at z=30. Probably only one metal-free star forms per halo. • Star formation occurring after the HII region recombines and merges is probably f ...
Part I: Shining a Light on Visual Magnitude
... of capabilities and we will cover a sliver of them for this analysis, specifically features related to measuring the visual magnitude of stars. We need to first understand visual magnitude (vMag). When a telescope or sensor looks up at the sky, the brightness of the objects it’s looking at is called ...
... of capabilities and we will cover a sliver of them for this analysis, specifically features related to measuring the visual magnitude of stars. We need to first understand visual magnitude (vMag). When a telescope or sensor looks up at the sky, the brightness of the objects it’s looking at is called ...
Distance determination for RAVE stars using stellar models
... used to illuminate a host of substructures in the Galactic halo. The strength of photometric distances is that they can be constructed for a wide range of stellar populations. An important recent study was carried out by Ivezić et al. (2008). In this work they took high-precision multi-band optical ...
... used to illuminate a host of substructures in the Galactic halo. The strength of photometric distances is that they can be constructed for a wide range of stellar populations. An important recent study was carried out by Ivezić et al. (2008). In this work they took high-precision multi-band optical ...
Discovery of a candidate inner Oort cloud planetoid
... inclinations. Continued perturbations can move the perihelion back into the planetary region where the object becomes a new visible comet with a semimajor axis still ∼ 104 AU. The major inconsistency between this picture of the formation of the Oort cloud and the orbit of our newly discovered object ...
... inclinations. Continued perturbations can move the perihelion back into the planetary region where the object becomes a new visible comet with a semimajor axis still ∼ 104 AU. The major inconsistency between this picture of the formation of the Oort cloud and the orbit of our newly discovered object ...
Document
... However, in some galaxies (less massive ones, which have the lowest star formation rate), Mgas should be taken into account One gets indeed a better correlation between log vmax and log(Mdisk = M*+Mgas) than with M* alone → suggests that the M/L ratio (and thus the fraction of dark matter) is ± cons ...
... However, in some galaxies (less massive ones, which have the lowest star formation rate), Mgas should be taken into account One gets indeed a better correlation between log vmax and log(Mdisk = M*+Mgas) than with M* alone → suggests that the M/L ratio (and thus the fraction of dark matter) is ± cons ...
LSS-GAC – A LAMOST Spectroscopic Survey of the
... statistical analysis of large samples of more distant galaxies (e.g. Mayer, Governato & Kaufmann 2008). Both approaches depend on the acquisition of large survey samples. The Milky Way is an archetypical disk galaxy and the only grand-design (barred) spiral that individual constituent stars can be r ...
... statistical analysis of large samples of more distant galaxies (e.g. Mayer, Governato & Kaufmann 2008). Both approaches depend on the acquisition of large survey samples. The Milky Way is an archetypical disk galaxy and the only grand-design (barred) spiral that individual constituent stars can be r ...
Space astrometry 3: Gaia: scientific rationale, principles, and data analysis
... • not generally associated with reflective systems with no dioptric elements, but it exists for Hipparcos (and others) since the telescope optics are asymmetric • for the 100,000 stars of Hipparcos, correction of colour-dependent shifts used approximate star colours, either a priori from ground-base ...
... • not generally associated with reflective systems with no dioptric elements, but it exists for Hipparcos (and others) since the telescope optics are asymmetric • for the 100,000 stars of Hipparcos, correction of colour-dependent shifts used approximate star colours, either a priori from ground-base ...
Altitude and Azimuth 4 page
... ALTITUDE: The angle of an object above the horizon. Altitude is measured in degrees along a line perpendicular to the horizon, to the object of interest. An object on the horizon has an Altitude of 0 o, an object directly overhead has an Altitude of 90o. AZIMUTH: The angle from North clockwise along ...
... ALTITUDE: The angle of an object above the horizon. Altitude is measured in degrees along a line perpendicular to the horizon, to the object of interest. An object on the horizon has an Altitude of 0 o, an object directly overhead has an Altitude of 90o. AZIMUTH: The angle from North clockwise along ...
Steven R. Majewski - UCLA Physics & Astronomy
... – “central cusps problem” – “angular momentum problems” Abadi et al. (2003): “Current cosmological simulations have difficulties making anything that looks like a real galaxy.” ...
... – “central cusps problem” – “angular momentum problems” Abadi et al. (2003): “Current cosmological simulations have difficulties making anything that looks like a real galaxy.” ...
Chapter 1 The Scale of the Cosmos: From Solar System to Galaxy to
... view by a factor of 100, the solar system becomes invisibly small. • The sun is only a point of light, and all the planets and their orbits are now crowded into the small red square at the center. • The planets are too small and reflect too little light to be visible so near the brilliance of the ...
... view by a factor of 100, the solar system becomes invisibly small. • The sun is only a point of light, and all the planets and their orbits are now crowded into the small red square at the center. • The planets are too small and reflect too little light to be visible so near the brilliance of the ...
X-ray studies of star and planet formation Eric Feigelson
... regions (e.g. Taurus, Orion), the fields are very badly (factors ~ few-100) contaminated by Galactic field stars. Chandra is typically sensitive only to masses >0.3-1 MO (depending on exposure), but suffers only ~5-25% contamination from older stars and quasars (!). Chandra thus provides the best cl ...
... regions (e.g. Taurus, Orion), the fields are very badly (factors ~ few-100) contaminated by Galactic field stars. Chandra is typically sensitive only to masses >0.3-1 MO (depending on exposure), but suffers only ~5-25% contamination from older stars and quasars (!). Chandra thus provides the best cl ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... Cepheid variable. This type of star has a wonderful property: Its brightness waxes and wanes like clockwork, and the longer it takes to vary, the greater the star's intrinsic brightness. That means the star can be used to measure cosmic distances. By comparing the true brightness of the Cepheid in M ...
... Cepheid variable. This type of star has a wonderful property: Its brightness waxes and wanes like clockwork, and the longer it takes to vary, the greater the star's intrinsic brightness. That means the star can be used to measure cosmic distances. By comparing the true brightness of the Cepheid in M ...
Evidence for a signature of the galactic bar in the solar neighbourhood
... The kinematical properties of disc stars in the solar neighbourhood have been extensively studied in the past. Velocity dispersion increase with age, or vertex deviation have been well known facts for a long time. Recent results obtained in this connection by using accurate HIPPARCOS proper motions ...
... The kinematical properties of disc stars in the solar neighbourhood have been extensively studied in the past. Velocity dispersion increase with age, or vertex deviation have been well known facts for a long time. Recent results obtained in this connection by using accurate HIPPARCOS proper motions ...
What are Messier Objects? - Bowling Green State University
... However I used a more specific link created from this website. One for each Messier object, which are the following: http://www.maa.clell.de/Messier/E/m035.html http://www.maa.clell.de/Messier/E/m042.html http://www.maa.clell.de/Messier/E/m044.html http://www.maa.clell.de/Messier/E/m053.html http:// ...
... However I used a more specific link created from this website. One for each Messier object, which are the following: http://www.maa.clell.de/Messier/E/m035.html http://www.maa.clell.de/Messier/E/m042.html http://www.maa.clell.de/Messier/E/m044.html http://www.maa.clell.de/Messier/E/m053.html http:// ...
Linking Asteroids and Meteorites through Reflectance
... • Stars nearer the center would complete an orbit much quicker than stars farther out • Would cause the arms to wrap up into a tight coil • We do not see that among spiral galaxies ...
... • Stars nearer the center would complete an orbit much quicker than stars farther out • Would cause the arms to wrap up into a tight coil • We do not see that among spiral galaxies ...
Discussion Session A: “Evidence”
... A) Starburst galaxies B) Normal star-‐forming galaxies C) Quiescent galaxies D) Massive galaxies E) Green valley/transi8on galaxies F) All equally likely ...
... A) Starburst galaxies B) Normal star-‐forming galaxies C) Quiescent galaxies D) Massive galaxies E) Green valley/transi8on galaxies F) All equally likely ...
Introduction Contact Weak Lensing: Method The NOAO Deep Wide
... Observations of Supernovae have revealed that the expansion of the Universe is accelerating. Because dark matter decelerates the expansion, this points to a new component to the Universe —the Dark Energy. Experiments like the JDEM missions and LSST will use gravitational lensing as a tool to measure ...
... Observations of Supernovae have revealed that the expansion of the Universe is accelerating. Because dark matter decelerates the expansion, this points to a new component to the Universe —the Dark Energy. Experiments like the JDEM missions and LSST will use gravitational lensing as a tool to measure ...
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.