From planetesimals to planetary systems: a hardles race
... Single size particles in the simulations (small particles may contribute significantly to the the growth of larger bodies). Each particle is representative of many particles (pre-clumping?) Drag is computed from nodes around the particle and back reaction acts on the nodes. What is the effect ...
... Single size particles in the simulations (small particles may contribute significantly to the the growth of larger bodies). Each particle is representative of many particles (pre-clumping?) Drag is computed from nodes around the particle and back reaction acts on the nodes. What is the effect ...
Compare/Order Decimals
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
relativistic time correction on movement of distant galaxies
... at about 13.4+5=18.4 billion years ago. (In fact, present age of this star is to be multiplied by 1+z =1.98. So it is 5x1.98= 9.9 billion light years. But we have just received light from that galaxy and hence cannot see the past life of star). But 18.4 billion years is greater than the present esti ...
... at about 13.4+5=18.4 billion years ago. (In fact, present age of this star is to be multiplied by 1+z =1.98. So it is 5x1.98= 9.9 billion light years. But we have just received light from that galaxy and hence cannot see the past life of star). But 18.4 billion years is greater than the present esti ...
Power Punt on Binary Asteroids
... • At OU, several students and I observed lightcurves of (22) Kalliope and its companion Linus during eclipses • By combining lightcurves taken by a number of asteronomers (some amateurs) the sizes, masses and densities of objects were refined ...
... • At OU, several students and I observed lightcurves of (22) Kalliope and its companion Linus during eclipses • By combining lightcurves taken by a number of asteronomers (some amateurs) the sizes, masses and densities of objects were refined ...
A search for a new class of pulsating DA white dwarf stars in the DB
... The hottest of the white dwarf pulsators are the pulsating PG 1159 stars, or GW Vir stars, of which there are fewer than a couple of dozen known; they have 170 000 ≥ T eff ≥ 75 000 K. The asteroseismic record holder at the time of this writing is the prototype of this class, PG 1159−035 itself, whic ...
... The hottest of the white dwarf pulsators are the pulsating PG 1159 stars, or GW Vir stars, of which there are fewer than a couple of dozen known; they have 170 000 ≥ T eff ≥ 75 000 K. The asteroseismic record holder at the time of this writing is the prototype of this class, PG 1159−035 itself, whic ...
Improving the Gaia planet catch by combining the astrometry with
... amplitude of the signal caused by a planetary companion and compared it to the expected instrumental precisions. If the simulated signal was greater than the detection threshold of the instruments, we considered that the planet could be detected. The first step of our study was to determine the prec ...
... amplitude of the signal caused by a planetary companion and compared it to the expected instrumental precisions. If the simulated signal was greater than the detection threshold of the instruments, we considered that the planet could be detected. The first step of our study was to determine the prec ...
AAVSO: Epsilon Aurigae
... recorded another dimming event in 1874-1875, and yet another was recorded in 1901-1902. Based on all of the observational evidence to date, Ludendorff suggested the object is similar to the Algol variables, now known to be eclipsing binaries that interact when one star transfers matter to the other. ...
... recorded another dimming event in 1874-1875, and yet another was recorded in 1901-1902. Based on all of the observational evidence to date, Ludendorff suggested the object is similar to the Algol variables, now known to be eclipsing binaries that interact when one star transfers matter to the other. ...
Desert Skies - Tucson Amateur Astronomy Association
... for future in city star parties. The main issues are having access to restrooms, a facility that is open at least to 9:00 PM and that is on or close to a Sun Tran route for easy transit access. Once these kinks have been worked out we will be able to proceed. We were also asked to check and see if t ...
... for future in city star parties. The main issues are having access to restrooms, a facility that is open at least to 9:00 PM and that is on or close to a Sun Tran route for easy transit access. Once these kinks have been worked out we will be able to proceed. We were also asked to check and see if t ...
THE ABSOLUTE MAGNITUDE OF RR LYRAE - Cosmos
... stars with larger relative errors have brighter luminosities, i.e., have smaller parallaxes, appears clearly when the true parallax is small, compared with error of parallax. Similarly the distant stars have too faint luminosities, i.e., have too large parallaxes, mainly because the true parallax is ...
... stars with larger relative errors have brighter luminosities, i.e., have smaller parallaxes, appears clearly when the true parallax is small, compared with error of parallax. Similarly the distant stars have too faint luminosities, i.e., have too large parallaxes, mainly because the true parallax is ...
PPT presentation
... first 2.5 mags of its PNLF. Steep turnover at high L’s interpreted as due to sharp cutoff to upper mass limit of PN central stars. ...
... first 2.5 mags of its PNLF. Steep turnover at high L’s interpreted as due to sharp cutoff to upper mass limit of PN central stars. ...
Differential Rotation in A stars
... There is a trade off between rotation and macroturbulent velocities. You can compensate a decrease in rotation by increasing the macroturbulent velocity. At low rotational velocities it is difficult to distinguish the two. Above the red line represents V = 3 km/s, M = 0 km/s. The blue line represent ...
... There is a trade off between rotation and macroturbulent velocities. You can compensate a decrease in rotation by increasing the macroturbulent velocity. At low rotational velocities it is difficult to distinguish the two. Above the red line represents V = 3 km/s, M = 0 km/s. The blue line represent ...
harvest09b - NMSU Astronomy
... It is clear that cold flows are prominent and required to fuel the continuation of star formation The scaling of the outflow velocity with SFR qualitatively is promising in its comparison with observations ...
... It is clear that cold flows are prominent and required to fuel the continuation of star formation The scaling of the outflow velocity with SFR qualitatively is promising in its comparison with observations ...
ppt
... 1755: the idea of a solar nebula by Kant: An early universe evenly filled with thin gas Gravitationally unstable → large dense clumps These clumps rotate → falltened disks Telescopes were unable to observe such disks ...
... 1755: the idea of a solar nebula by Kant: An early universe evenly filled with thin gas Gravitationally unstable → large dense clumps These clumps rotate → falltened disks Telescopes were unable to observe such disks ...
May 2017 - Bays Mountain Park
... overall, behind Hydra. Virgo is easily found through its brightest star, Spica. There is also an abundance of deep-sky objects in this constellation. Some of them include: M104 (also known as the Sombrero Galaxy), M49, M58, M59, M60, M61, M84, M86, M87, M89, and M90. All of these are galaxies, eithe ...
... overall, behind Hydra. Virgo is easily found through its brightest star, Spica. There is also an abundance of deep-sky objects in this constellation. Some of them include: M104 (also known as the Sombrero Galaxy), M49, M58, M59, M60, M61, M84, M86, M87, M89, and M90. All of these are galaxies, eithe ...
Meet the Dwarf Planets Pluto: The Demoted Former Planet
... Pluto. But things changed five years ago. On Aug. 24, 2006, the International Astronomical Union (IAU) struck Pluto from the list, demoting it to the newly created category of "dwarf planet." The move was spurred by the discovery of multiple large bodies orbiting even farther from the sun than dista ...
... Pluto. But things changed five years ago. On Aug. 24, 2006, the International Astronomical Union (IAU) struck Pluto from the list, demoting it to the newly created category of "dwarf planet." The move was spurred by the discovery of multiple large bodies orbiting even farther from the sun than dista ...
NuSeti-2015 - Department of Physics and Astronomy
... Doubly ionized He is more opaque (than, say singly ionized He) At the dimmest point of the cycle, the gas is most opaque, and outermost layers heat and expand, as the gas expands, it begins to cool, so becomes less ionized and hence more transparent, radiation escapes. The expansion stops and star c ...
... Doubly ionized He is more opaque (than, say singly ionized He) At the dimmest point of the cycle, the gas is most opaque, and outermost layers heat and expand, as the gas expands, it begins to cool, so becomes less ionized and hence more transparent, radiation escapes. The expansion stops and star c ...
Rotational Doppler beaming in eclipsing binaries
... Van Kerkwijk et al. (2010). As the star spins on its rotational axis half of the star will be moving towards the observer and half of it will be moving away from the observer. In non-eclipse conditions and for axisymmetric stars the combined beaming effect of these two halves exactly cancels. Howeve ...
... Van Kerkwijk et al. (2010). As the star spins on its rotational axis half of the star will be moving towards the observer and half of it will be moving away from the observer. In non-eclipse conditions and for axisymmetric stars the combined beaming effect of these two halves exactly cancels. Howeve ...
How to interpret LPV in roAp stars Hiromoto Shibahashi , Don Kurtz
... Equ, spectacular line profile variations (LPV) in lines of Nd III and Pr III that they interpreted as being caused by oblique pulsation modes of = 2 or 3 and m = - or -+1. The LPV move only from blue-to-red. Similar LPV are also seen in some other roAp stars in lines of ND III and Pr III, wh ...
... Equ, spectacular line profile variations (LPV) in lines of Nd III and Pr III that they interpreted as being caused by oblique pulsation modes of = 2 or 3 and m = - or -+1. The LPV move only from blue-to-red. Similar LPV are also seen in some other roAp stars in lines of ND III and Pr III, wh ...
Density, Mass and Surface Area
... Density, Mass and Surface Area The relationship between diameter and mass yields a third important parameter: density. The old ‘trick question” goes: which weighs more, a pound of feathers or a pound of bricks? The clever student will respond: neither, they both weigh a pound, that is, they have th ...
... Density, Mass and Surface Area The relationship between diameter and mass yields a third important parameter: density. The old ‘trick question” goes: which weighs more, a pound of feathers or a pound of bricks? The clever student will respond: neither, they both weigh a pound, that is, they have th ...
University of Arizona Department of Astronomy
... 25. Giant planets have solid surfaces 26. Saturn is the only planet with rings 27. Saturn’s rings are solid 28. Pluto is always the farthest planet from the Sun 29. The Sun primarily emits yellow light 30. The Sun is solid & shines by burning gas or from molten lava 31. The Sun always rises directly ...
... 25. Giant planets have solid surfaces 26. Saturn is the only planet with rings 27. Saturn’s rings are solid 28. Pluto is always the farthest planet from the Sun 29. The Sun primarily emits yellow light 30. The Sun is solid & shines by burning gas or from molten lava 31. The Sun always rises directly ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.