CoRoT III programme
... Because CoRoT is probing effects that were not detectable so far, new types of signal analysis
as well as new theoretical tools are being developed.
All these data are being interpreted in terms of planetary systems evolution and physical
processes in stellar interiors. Most of these results are pub ...
Unfolding the Milky Way bulge - International Max Planck Research
... 5.5 (J − K s ) and (J − H) color difference between our control field and those measured in the subfields of tiles b317, b303 and b275. The size of the subfields
corresponds to the same resolution described in Fig. 2. The blue dashed line
shows the relation E(J − H) = 0.638E(J − K s ) corresponding ...
Particle Physics from Stars
... where the nonlinear interplay of the equations of stellar structure is represented
in a simple analytic fashion [ 16].
The solar luminosity is well measured, yet this brightening effect is not observable because all else need not be equal. The present-day luminosity of the Sun
depends on its unknown ...
The Lupus clouds - European Southern Observatory
... The Lupus clouds are projected on the sky against the nearest and one of the best studied OB associations, Scorpius-Centaurus (e.g. Blaauw 1991, de Geus et al. 1989, de
Geus 1992, Preibisch et al. 2002; see also chapter by Preibisch & Mamajek). The
Scorpius-Centaurus association is a vast complex in ...
Communications in Asteroseismology
... the ﬁrst results from space asteroseismology are available? Isn’t it odd to celebrate the 65th
birthday of a renowned asteroseismologist who is far from retirement at this point?
The answer to the ﬁrst question is easy: at the outset of this meeting, MOST was already
in space and COROT was soon to b ...
Protoplanetary Disks and their Evolution
... quickly and that the flow of material from the envelope, which declines in mass
by almost an order of magnitude between these two classes (Young et al. 2003),
is rapidly transported through the disk.
One possibility for the rapid transport is disk instabilities. Laughlin & Bodenheimer (1994) first s ...
Understanding Variable Stars - Central Florida Astronomical Society
... Understanding Variable Stars
Variable stars are those that change brightness. Their variability may be due to
geometric processes such as rotation, or eclipse by a companion star, or physical
processes such as vibration, ﬂares, or cataclysmic explosions. In each case, variable stars
provide unique ...
Here - NASA/IPAC Extragalactic Database
... H ii regions are ionized clouds of gas associated with zones of recent star formation.
They are powered by one, a few, or a cluster of massive stars (depending on the resolution
at which one is working). The effective temperatures T? of the ionizing stars lie in the
range 35 000 – 50 000 K. The nebu ...
Worlds Beyond The Poles
... press as “More daring than anything Jules Verne ever conceived.” Today,
thirty years later, the United States, Russia, Argentina, and other nations
have bases on that realistic land extent which is beyond the Earth. It is not
space, as theory dictated; it is land and water of the same order that
The VIMOS Ultra-Deep Survey (VUDS): Fast Increase in the Fraction
... the neutral hydrogen and/or by the dust. As a result, in general,
Lyα emission is more attenuated than other UV photons, with
the Lyα escape fraction (i.e., the fraction of the Lyα photons
that escape the galaxies) that depends strongly on the relative
kinematics of the HII and HI regions, dust cont ...
c Copyright by Jonathan C. McKinney, 2004
... and rout = 600GM/c2 ). Shown are the density (upper left), Bernoulli parameter (Be = (1/2)v 2 + c2s /(γ − 1) + Ψ) (upper right; dotted line is a negative contour), scaled mass flux r2 sin θ(ρ0 v) (lower left), and scaled angular momentum flux
r3 sin2 θ(ρ0 vvφ + Π · φ̂) (lower right). The flow is not ...
X-ray astronomy of stellar coronae (Review)
... While this review is entirely devoted to (non-solar) stellar studies, an important anchor
point would be missing if the success of the Skylab mission in the early seventies were
not mentioned. The high-quality images of the full-disk Sun in X-rays formed, together
with data from previous rocket flig ...
8th Grade Science
... At the center of an atom is the nucleus (plural, nuclei). The nucleus contains most of the atom’s mass. However, in
size, it’s just a tiny part of the atom. The model in Figure above is not to scale. If an atom were the size of a football
stadium, the nucleus would be only about the size of a pea.
Observations and Theory of Dynamical Triggers for Star Formation
... or recollects into denser cores in which star clusters eventually form. Large
scale triggering (Table 3): accumulation of gas into an expanding shell or ring
partially surrounding the pressure source, with star formation in the shell or
ring presumably triggered by gravitational collapse of swept-up ...
harlow shapley - National Academy of Sciences
... brightness of every variable star on a photograph had to be performed, and the period of light variation and median apparent
magnitude for every star of interest had to be determined with
care. Shapley did not have available calibrated median absolute
luminosities for the stars in which he was inter ...
The evolution of close binaries with white dwarf components
... When one of the stars overﬂows its Roche lobe, it tends to lose most of its envelope. The
evolution of the star is signiﬁcantly shortened or even stopped prematurely. In the latter
case, nuclear burning ceases after the mass transfer phase. Consequently, the inert core
contracts and cools down to fo ...
The Day We Found the Universe
... happily changed to civil reckoning for determining the start of a day. No longer would the astronomical day begin
at high noon, a tradition launched in the days of Ptolemy that often led to great bookkeeping confusion. Instead, it
now began at midnight, just as it did for everyone else. “It will pro ...
The impact of mass-loss on the evolution and pre
... When extended blue loops or blue ward excursions are produced by enhanced mass-loss, the models predict that a majority of blue
(yellow) supergiants are post RSG objects. These post RSG stars are predicted to show much smaller surface rotational velocities
than similar blue supergiants on their firs ...
Giant star seismology
... tremendously using these seismic inferences, and we anticipate that more information is still hidden in the data. Unraveling this will further improve our understanding
of stellar evolution. This will also have significant impact on our knowledge of the
Milky Way Galaxy as well as on exo-planet host ...
PDF hosted at the Radboud Repository of the Radboud University
... It should be noted that despite the general homogeneity of type Ia supernova explosions,
there is growing observational evidence of a number of distinctive sub-groups (e.g. several subclasses of sub- and super-luminous events) which exhibit small, yet noticeable and systematic
spectroscopic and phot ...
Report from the Subaru Telescope for External
... dark matter. Lensing studies of clusters have indeed conﬁrmed several important
predictions of the standard-cold dark matter dominated (CDM) model. Okabe et al.(2010)
used high-quality Subaru Telescope/Suprime-Cam imaging data to conduct a detailed weak
lensing study of the distribution of dark matt ...
1 Globular Cluster Systems - McMaster Physics and Astronomy
... there are still a few clusters with exceptionally high reddenings embedded
deep in the Galactic bulge about which we know almost nothing (see the
listings in Harris 1996a).
However, progress over the years has been steady and substantial: compare the two graphs in Fig. 1.4. One (from the data of Sha ...
Future of an expanding universe
Observations suggest that the expansion of the universe will continue forever. If so, the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario is popularly called the Big Freeze.If dark energy—represented by the cosmological constant, a constant energy density filling space homogeneously, or scalar fields, such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space—accelerates the expansion of the universe, then the space between clusters of galaxies will grow at an increasing rate. Redshift will stretch ancient, incoming photons (even gamma rays) to undetectably long wavelengths and low energies. Stars are expected to form normally for 1012 to 1014 (1–100 trillion) years, but eventually the supply of gas needed for star formation will be exhausted. And as existing stars run out of fuel and cease to shine, the universe will slowly and inexorably grow darker, one star at a time. According to theories that predict proton decay, the stellar remnants left behind will disappear, leaving behind only black holes, which themselves eventually disappear as they emit Hawking radiation. Ultimately, if the universe reaches a state in which the temperature approaches a uniform value, no further work will be possible, resulting in a final heat death of the universe.