825 research outputs found
Metal-poor stars towards the Galactic bulge:a population potpourri
We present a comprehensive chemical abundance analysis of five red giants and two horizontal branch (HB) stars towards the southern edge of the Galactic bulge, at (l, b) ~ (0°,−11°). Based on high-resolution spectroscopy obtained with the Magellan/MIKE spectrograph, we derived up to 23 chemical element abundances and identify a mixed bag of stars, representing various populations in the central regions of the Galaxy. Although cosmological simulations predict that the inner Galaxy was host to the first stars in the Universe, we see no chemical evidence of the ensuing massive supernova explosions: all of our targets exhibit halo-like, solar [Sc/Fe] ratios, which is in contrast to the low values predicted from Population III nucleosynthesis. One of the targets is a CEMP-s star at [Fe/H] = −2.52 dex, and another target is a moderately metal-poor ([Fe/H] = −1.53 dex) CH star with strong enrichment in s-process elements (e.g., [Ba/Fe] = 1.35). These individuals provide the first contenders of these classes of stars towards the bulge. Four of the carbon-normal stars exhibit abundance patterns reminiscent of halo star across a metallicity range spanning −2.0 to −2.6 dex, i.e., enhanced α-elements and solar Fe-peak and neutron-capture elements, and the remaining one is a regular metal-rich bulge giant. The position, distance, and radial velocity of one of the metal-poor HB stars coincides with simulations of the old trailing arm of the disrupted Sagittarius dwarf galaxy. While their highly uncertain proper motions prohibit a clear kinematic separation, the stars’ chemical abundances and distances suggest that these metal-poor candidates, albeit located towards the bulge, are not of the bulge, but rather inner halo stars on orbits that make them pass through the central regions. Thus, we caution similar claims of detections of metal-poor stars as true habitants of the bulge
Globular Cluster Abundances from High-Resolution Integrated Light Spectra, I: 47 Tuc
We describe the detailed chemical abundance analysis of a high-resolution
(R~35,000), integrated-light (IL), spectrum of the core of the Galactic
globular cluster 47 Tuc, obtained using the du Pont echelle at Las Campanas. We
develop an abundance analysis strategy that can be applied to spatial
unresolved extra- galactic clusters. We have computed abundances for Na, Mg,
Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Ba, La, Nd and Eu. For an
analysis with the known color-magnitude diagram (cmd) for 47 Tuc we obtain a
mean [Fe/H] value of -0.75 +/-0.026+/-0.045 dex (random and systematic error),
in good agreement with the mean of 5 recent high resolution abundance studies,
at -0.70 dex. Typical random errors on our mean [X/Fe] ratios are 0.07-0.10
dex, similar to studies of individual stars in 47 Tuc, although Na and Al
appear enhanced, perhaps due to proton burning in the most luminous cluster
stars. Our IL abundance analysis with an unknown cmd employed theoretical
Teramo isochrones; however, we apply zero-point abundance corrections to
account for the factor of 3 underprediction of stars at the AGB bump
luminosity. While line diagnostics alone provide only mild constraints on the
cluster age (ruling-out ages younger than ~2 Gyr), when theoretical IL B-V
colors are combined with metallicity derived from the Fe I lines, the age is
constrained to 10--15 Gyr and we obtain [Fe/H]=-0.70 +/-0.021 +/-0.052 dex. We
find that Fe I line diagnostics may also be used to constrain the horizontal
branch morphology of an unresolved cluster. Lastly, our spectrum synthesis of
5.4 million TiO lines indicates that the 7300-7600A TiO window should be useful
for estimating the effect of M giants on the IL abundances, and important for
clusters more metal-rich than 47 Tuc.Comment: 40 pages text & references, 4 tables, 19 figures (72 pages total).
Changes include addition of B-V color to help constrain GC age. To appear in
Ap
Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba
A previous study (Nissen & Schuster 2010) of 94 dwarf stars with -1.6 <
[Fe/H] < -0.4 has revealed the existence of two distinct halo populations with
a systematic difference in [alpha/Fe] at a given metallicity. In continuation
of that work, abundances of Mn, Cu, Zn, Y, and Ba are determined for the same
sample of stars. Equivalent widths of atomic lines are measured from high
resolution VLT/UVES and NOT/FIES spectra and used to derive precise abundance
ratios from an LTE analysis based on MARCS model atmospheres. Systematic
differences between the `high-alpha' and `low-alpha' halo populations are found
for [Cu/Fe], [Zn/Fe], and [Ba/Y], whereas there is no significant difference in
the case of [Mn/Fe]. At a given metallicity, [Cu/Fe] shows a large scatter that
is closely correlated with a corresponding scatter in [Na/Fe] and [Ni/Fe]. The
metallicity trends of [Cu/Fe], [Zn/Fe], and [Ba/Y] can be explained from
existing nucleosynthesis calculations if the high-alpha stars formed in regions
with such a high star formation rate that only massive stars and Type II
supernovae contributed to the chemical enrichment. The low-alpha stars, on the
other hand, most likely originate from systems with a slower chemical
evolution, characterized by additional enrichment from Type Ia supernovae and
low-mass AGB stars.Comment: Accepted for publication in A&
The Kinematics and Chemistry of Red Horizontal Branch Stars in the Sagittarius Streams
We have selelcted 556 Red Horizontal Branch (RHB) stars along the streams of
the Sagittarius dwarf galaxy (Sgr) from SDSS DR7 spectroscopic data using a
theoretical model. The metallicity and \alpha-elements distributions are
investigated for stars in the Sgr streams and for Galactic stars at the same
locations. We find that the Sgr stars have two peaks in the metallicity
distribution while the Galactic stars have a more prominent metal-poor peak.
Meanwhile, [\alpha/Fe] ratios of the Sgr stars are lower than those of the
Galactic stars. Among the Sgr stars, we find a difference in the metallicity
distribution between the leading and trailing arms of the Sgr tidal tails. The
metallicity and [\alpha/Fe] distribution of the leading arm is similar to that
of the Galaxy. The trailing arm is composed mainly of a metal rich component
and [\alpha/Fe] is obviously lower than that of the Galactic stars. The
metallicity gradient is -(1.8 \pm 0.3)\times10^{-3} dex degree^{-1} in the
first wrap of the trailing arm and -(1.5 \pm 0.4)\times10^{-3} dex degree^{-1}
in the first wrap of the leading arm. No significant gradient exists along the
second wraps of the leading or trailing arms. It seems that the Sgr dwarf
galaxy initially lost the metal poor component in the second wrap (older) arms
due to the tidal force of our Galaxy and then the metal rich component is
disrupted in the first wrap (younger) arms. Finally, we found that the velocity
dispersion of the trailing arm from 88^\circ<\Lambda_\odot<112^\circ is \sigma
= 9.808 \pm 1.0 km s^{-1}, which is consistent with previous work in the
literature.Comment: 24 pages, 10 figures, accepted for publication in Ap
The First Detection of Blue Straggler Stars in the Milky Way Bulge
We report the first detections of Blue Straggler Stars (BSS) in the bulge of
the Milky Way galaxy. Proper motions from extensive space-based observations
along a single sight-line allow us to separate a sufficiently clean and
well-characterized bulge sample that we are able to detect a small population
of bulge objects in the region of the color-magnitude diagram commonly occupied
young objects and blue strgglers. However, variability measurements of these
objects clearly establish that a fraction of them are blue stragglers. Out of
the 42 objects found in this region of the color-magnitude diagram, we estimate
that at least 18 are genuine BSS. We normalize the BSS population by our
estimate of the number of horizontal branch stars in the bulge in order to
compare the bulge to other stellar systems. The BSS fraction is clearly
discrepant from that found in stellar clusters. The blue straggler population
of dwarf spheroidals remains a subject of debate; some authors claim an
anticorrelation between the normalised blue straggler fraction and integrated
light. If this trend is real, then the bulge may extend it by three orders of
magnitude in mass. Conversely, we find that the genuinely young (~5Gy or
younger) population in the bulge, must be at most 3.4% under the most
conservative scenario for the BSS population.Comment: ApJ in press; 25 pages, 6 figures, 2 table
Changed Patterns of Genomic Variation Following Recent Domestication: Selection Sweeps in Farmed Atlantic Salmon
The introduction of wild Atlantic salmon into captivity, and their subsequent artificial selection for production traits, has caused phenotypic differences between domesticated fish and their wild counterparts. Identification of regions of the genome underling these changes offers the promise of characterizing the early biological consequences of domestication. In the current study, we sequenced a population of farmed European Atlantic salmon and compared the observed patterns of SNP variation to those found in conspecific wild populations. This identified 139 genomic regions that contained significantly elevated SNP homozygosity in farmed fish when compared to their wild counterparts. The most extreme was adjacent to versican, a gene involved in control of neural crest cell migration. To control for false positive signals, a second and independent dataset of farmed and wild European Atlantic salmon was assessed using the same methodology. A total of 81 outlier regions detected in the first dataset showed significantly reduced homozygosity within the second one, strongly suggesting the genomic regions identified are enriched for true selection sweeps. Examination of the associated genes identified a number previously characterized as targets of selection in other domestic species and that have roles in development, behavior and olfactory system. These include arcvf, sema6, errb4, id2-like, and 6n1-like genes. Finally, we searched for evidence of parallel sweeps using a farmed population of North American origin. This failed to detect a convincing overlap to the putative sweeps present in European populations, suggesting the factors that drive patterns of variation under domestication and early artificial selection were largely independent. This is the first analysis on domestication of aquaculture species exploiting whole-genome sequence data and resulted in the identification of sweeps common to multiple independent populations of farmed European Atlantic salmon
3-Amino-5-bromo-2-iodopyridine
The reaction of 3-amino-5-bromopyridine with N-iodosuccinimide in the presence of acetic acid produces the title compound, C5H4BrIN, with an iodo substituent in position 2 of the pyridine ring. The crystal structure features rather weak intermolecular N—H⋯N hydrogen bonds linking the molecules into chains along the z axis of the crystal
PSI-Search: iterative HOE-reduced profile SSEARCH searching
Summary: Iterative similarity searches with PSI-BLAST position-specific score matrices (PSSMs) find many more homologs than single searches, but PSSMs can be contaminated when homologous alignments are extended into unrelated protein domains—homologous over-extension (HOE). PSI-Search combines an optimal Smith–Waterman local alignment sequence search, using SSEARCH, with the PSI-BLAST profile construction strategy. An optional sequence boundary-masking procedure, which prevents alignments from being extended after they are initially included, can reduce HOE errors in the PSSM profile. Preventing HOE improves selectivity for both PSI-BLAST and PSI-Search, but PSI-Search has ~4-fold better selectivity than PSI-BLAST and similar sensitivity at 50% and 60% family coverage. PSI-Search is also produces 2- for 4-fold fewer false-positives than JackHMMER, but is ~5% less sensitive
Magnesium Isotopes in Metal-Poor Dwarfs, the Rise of AGB Stars and the Formation Timescale of the Galactic Halo
We have determined magnesium isotopic ratios (^{25,26}Mg/Mg) in metal-poor
(-2.6 [Fe/H] -1.3) halo dwarfs employing high S/N (90-280) high spectral
resolution (R = 10^5) Keck HIRES spectra. Unlike previous claims of an
important contribution from intermediate-mass AGB stars at low metallicities,
we find that the rise of the AGB contribution in the Galactic halo did not
occur until intermediate metallicities ([Fe/H] ~> -1.5).Comment: ApJ Letters, in pres
A Few Binary Star Puzzles for Roberto on the Occasion of His Birthday
Radial velocity observations accumulated during the past 16 years are used to
derive a preliminary orbit for the CEMP star CS 22881-036. The velocity
amplitude is very small. No velocity variation is found for three additional
CEMP stars observed over roughly the same time interval. Searches for
companions of two CEMP double-lined spectroscopic binaries and of the RR Lyrae
star TY Gruis are reviewed. A disparity between the period distribution of disk
carbon-star binaries and that of their parent population of normal binaries can
be attributed qualitatively to a decline in accreted mass with increasing
binary separation. Finally, possible reasons for failure to find expected
companions of CEMP stars are discussed.Comment: 12 pages, 5 figures, Gallino Birthday Worksho
- …