August
25, 2008
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Bryant 217
|
Ramsey
Lundock (Tohoku University) |
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Observational Models for
Extrasolar Planets |
| Abstract |
Within the 10 years, next generation telescopes such as TPF
and will be capable of directly observation Extrasolar planets and
collecting spectrography data from them. The theoretical framework for
interpreting that data needs a strong foundation based on comparisons
to the solar system planets. In this presentation I discuss preliminary
observations performed at Hiroshima Observatory and plans for future
Antarctic observations, which together will create a planet observation
library for comparison with Extrasolar planet simulations and
observations.
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| September
1, 2008 |
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Labor Day
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| September
8, 2008 |
Physics 2165
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Nathan De
Lee (UF Astronomy)
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Tracing the Galactic Halo: RR
Lyrae Stars from SDSS-II
|
| Abstract |
As we prepare to enter the era of large multi-epoch
photometric surveys,
LSST and PAN-STARRS to name a few, it is important to lay the ground
work
for many of the automatic detection and characterization techniques of
variable stars. This talk describes the creation of a large
catalog of RR
Lyrae stars, their lightcurves, and their associated photometric and
kinematic parameters. This catalog contains 421 RR Lyrae
lightcurves with
305 RRab and 116 RRc derived from the SDSS-II Supernova Survey.
Of these,
241 stars have stellar spectra taken with either the Blanco 4m RC
spectrograph or the SDSS/SEGUE survey, and in some cases taken by
both.
From these spectra, and photometric methods derived from them, an
analysis
is conducted of the RR Lyrae's distribution, metallicity, kinematics,
and
photometric properties within the galactic halo.
In particular, the idea of a dual halo is explored primarily in the
context of radial velocity distributions as a function of |Z| vertical
distance from the plane. Since there are no proper motions
available, the
radial velocity is used as a proxy for orbital velocity, and is
ultimately
compared and contrasted with a single halo galactic model. Also,
the
variation of the Oosterhoff dichotomy, an empirical distribution in RR
Lyrae star properties, is discussed.
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September
15, 2008
|
Bryant 217
|
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| Abstract |
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September
22, 2008
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Physics 2165
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| Abstract |
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September
29, 2008
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Bryant 217
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| Abstract |
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October
6, 2008
|
Bryant 217
|
Jos Oomens (FOM-Institute
for Plasma Physics Rijnhuizen |
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IR Spectroscopy of Ionized Carbonaceous
Compounds of Astrophysical Internest
|
| Abstract |
Large carbonaceous molecules are now well-accepted to occur
abundantly in inter- and circumstellar environments. However, their
identification by microwave spectroscopy is often hindered by the large
rotational partition functions and sample heterogeneity. Moreover, in
the dilute environment of interstellar clouds, ionic and radical
systems may easily survive, making their spectroscopic study in the
laboratory difficult.
I will give an overview of our studies on the gas-phase IR spectroscopy
(5 - 20 m) of cationic polyaromatic molecules against the background
of the Unidentified Infrared emission bands (UIRs) that have been
observed toward many galactic sources. Other carbonaceous species of
interest include diamondoid molecules and fullerenes. Spectra are
obtained through infrared multiple photon dissociation (IRMPD)
spectroscopy using a free electron laser as source of intense and
widely tunable infrared radiation.
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October
13, 2008
|
Bryant 217
|
Nancy
Levenson (Kentucky) |
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| Abstract |
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October
20, 2008
|
Physics 2165
|
Althea Moorhead
(UF Astronomy)
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| Abstract |
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October
27, 2008
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| Abstract |
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November
3, 2008
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Sebastian Hidalgo (IAC)
|
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Recovering the Ages of Stars of a Complex Stellar
Population System: IAC-pop/MINNIAC and the LCID project
|
| Abstract |
We present IAC-pop/MINNIAC, a code to recover the age of
stars of a complex stellar population system, like a galaxy. It uses a
genetic algorithm to minimize a $\chi^2$ merit function
comparing the star distributions in the observed color-magnitude
diagram (CMD) and the CMD of a synthetic stellar population. A
parametrization of the CMDs is used, which is the main input of the
code.
The computation of the synthetic CMD can be done using the code
IAC-star. Since this is a quite time consuming step, a method is
presented requiring computation of only a single synthetic CMD.
IAC-pop/MINNIAC has been run through several consistency test and has
been proved with deep ACS@HST photometry from the LCID project. We
present the first results for the star formation histories
of six galaxies using IAC-pop/MINNIAC code.
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November
10, 2008
|
Bryant 217
|
Matt Payne (Cambridge)
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| Abstract |
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November
17, 2008
|
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Alex Lobel (Royal
Observatory of Belgium)
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| Abstract |
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November
24, 2008
|
Bryant 217
|
Tarek Saab (UF
Physics)
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| Abstract |
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December
1, 2008
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| Abstract |
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December
8, 2008
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| Abstract |
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December
15, 2008
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Rachel Mason
(Gemini)
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| Abstract |
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Spring
2008 Schedule