124 research outputs found
The distance to the young cluster NGC 7129 and its age
The dust cloud TGU H645 P2 and embedded in it young open cluster NGC 7129 are
investigated using the results of medium-band photometry of 159 stars in the
Vilnius seven-colour system down to V = 18.8 mag. The photometric data were
used to classify about 50 percent of the measured stars in spectral and
luminosity classes. The extinction A_V vs. distance diagram for the 20x20
arcmin area is plotted for 155 stars with two-dimensional classification from
the present and the previous catalogues. The extinction values found range
between 0.6 and 3.4 mag. However, some red giants, located in the direction of
the dense parts of the cloud, exhibit the infrared extinction equivalent up to
A_V = 13 mag. The distance to the cloud (and the cluster) is found to be 1.15
kpc (the true distance modulus 10.30 mag). For determining the age of NGC 7129,
a luminosity vs. temperature diagram for six cluster members of spectral
classes B3 to A1 was compared with the Pisa pre-main-sequence evolution tracks
and the Palla birthlines. The cluster can be as old as about 3 Myr, but star
forming continues till now as witnessed by the presence in the cloud of many
younger pre-main-sequence objects identified with photometry from 2MASS,
Spitzer and WISE infrared surveys.Comment: 8 pages, 6 fugures, full Table 1 online. Accepted for publication in
MNRAS on 2013 November 3
When the tale comes true: multiple populations and wide binaries in the Orion Nebula Cluster
The high-quality OmegaCAM photometry of the 3x3 deg around the Orion Nebula
Cluster (ONC) in r, and i filters by Beccari et al.(2017) revealed three
well-separated pre-main sequences in the color-magnitude diagram (CMD). The
objects belonging to the individual sequences are concentrated towards the
center of the ONC. The authors concluded that there are two competitive
scenarios: a population of unresolved binaries and triples with an exotic mass
ratio distribution, or three stellar populations with different ages. We use
Gaia DR2 in combination with the photometric OmegaCAM catalog to test and
confirm the presence of the putative three stellar populations. We also study
multiple stellar systems in the ONC for the first time using Gaia DR2. We
confirm that the second and third sequence members are more centrally
concentrated towards the center of the ONC. In addition we find an indication
that the parallax and proper motion distributions are different among the
members of the stellar sequences. The age difference among stellar populations
is estimated to be 1-2 Myr. We use Gaia measurements to identify and remove as
many unresolved multiple system candidates as possible. Nevertheless we are
still able to recover two well-separated sequences with evidence for the third
one, supporting the existence of the three stellar populations. We were able to
identify a substantial number of wide binary objects (separation between
1000-3000 au). This challenges previously inferred values that suggested no
wide binary stars exist in the ONC. Our inferred wide-binary fraction is approx
5%. We confirm the three populations correspond to three separated episodes of
star formation. Based on this result, we conclude that star formation is not
happening in a single burst in this region. (abridged)Comment: Astronomy and Astrophysics (A&A) accepted. 12 pages, 9 figures +
appendix. New version with language corrections and new ID values in Tab.A.
Evidence of a substellar companion to AB Dor C
Studies of fundamental parameters of very low-mass objects are indispensable
to provide tests of stellar evolution models that are used to derive
theoretical masses of brown dwarfs and planets. However, only objects with
dynamically determined masses and precise photometry can effectively evaluate
the predictions of stellar models. AB Dor C (0.090 solar masses) has become a
prime benchmark for calibration of theoretical evolutionary models of low-mass
young stars. One of the ambiguities remaining in AB Dor C is the possible
binary nature of this star. We observed AB Dor C with the VLTI/AMBER instrument
in low-resolution mode at the J, H and K bands. The interferometric observables
at the K-band are compatible with a binary brown dwarf system with tentative
components AB Dor Ca/Cb with a K-band flux ratio of 51% and a separation
of 381 mas. This implies theoretical masses of 0.0720.013 M and 0.0130.001 M for each component, near the
hydrogen-burning limit for AB Dor Ca, and near the deuterium-burning limit,
straddling the boundary between brown dwarfs and giant planets, for AB Dor Cb.
The possible binarity of AB Dor C alleviates the disagreement between observed
magnitudes and theoretical mass-luminosity relationships.Comment: 8 pages, 5 figures, accepted for publication in ApJ Letter
Los mamíferos de la formación Río Quinto (Plioceno), provincia de San Luis (Argentina). Aspectos bioestratigráficos, zoogeográficos y paleoambientales
A new faunal assemblage from cantera Díaz Nogarol, San Luis province (Argentina), is described. Xenarthrans, notoungulates, and rodents of five different families were identified: 1. Dasypodidae: Doellotatus chapalmalensis, Macrochorohates chapalmalensis, Maeroeuphractus retusus, Euphractini indet.; 2. Hegetotheriidae: Paedotherium typicum. Paedotherium insigne. Tremacyllus impressus; 3. Octodontidae: Actenomys sp., Pithanotomys sp., Eucelophorus cf. chapalmalensis sp.; 4. Caviidae: Pascualia cf. laeviplicata, Dolicavia minuscula, Caviodon multiplicatus; 5. Chinchillidae: Lagostomopsis sp. The presence of certain taxa such as D. minuscula, P. cf. laeviplicata and C. multiplicatus indicates a Chapadmalalan age for this faunal assemblage within the Late Pliocene. The xenarthran and the pachyrukhine taxa suggest a zoogeographic connexion between the subandean and the pampean regions during that time. The mammal association indicates open habitats, with arid-semiarid paleoenvironmental conditions.Se describe la asociación faunística procedente de la cantera Díaz Nogarol, provincia de San Luis (Argentina). Se han identificado representantes de cinco familias de xenartros, notoungulados y roedores: l. Dasypodidae: Doellotatus chapalmalensis, Macrochorohates chapalmalensis, Maeroeuphractus retusus, Euphractini indet.; 2. Hegetotheriidae: Paedotherium typicum. Paedotherium insigne. Tremacyllus impressus; 3. Octodontidae: Actenomys sp., Pithanotomys sp., Eucelophorus cf. chapalmalensis sp.; 4. Caviidae: Pascualia cf. laeviplicata, Dolicavia minuscula, Caviodon multiplicatus; 5. Chinchillidae: Lagostomopsis sp. La presencia de taxones como D. minuscula, P. cf. laeviplicata y C. multiplicatus indica una edad chapadmalalense dentro del Plioceno superior. Los xenartros y paquiruquinos identificados señalan una conexión zoogeográfica entre las regiones subandina y pampeana durante esa época. La asociación de mamíferos indica un hábitat abierto, con condiciones áridas-semiáridas
Dynamical masses of the low-mass stellar binary AB Doradus B
Context. ABDoradus is the main system of the ABDoradus moving group. It is a quadruple system formed by two widely separated binaries of pre-main-sequence (PMS) stars: ABDorA/C and ABDor Ba/Bb. The pair ABDorA/C has been extensively studied and its dynamical masses have been determined with high precision, thus making of ABDorC a benchmark for calibrating PMS stellar models. If the orbit and dynamical masses of the pair ABDor Ba/Bb can be determined, they could not only play a similar role to that of ABDorC in calibrating PMS models, but would also help to better understand the dynamics of the whole ABDoradus system. Aims. We aim to determine the individual masses of the pair ABDor Ba/Bb using VLBI observations and archive infrared data, as part of a larger program directed to monitor binary systems in the ABDoradus moving group. Methods. We observed the system ABDor B between 2007 and 2013 with the Australian Long Baseline Array (LBA), at a frequency of 8.4 GHz in phase-reference mode. Results. We detected, for the first time, compact radio emission from both stars in the binary, ABDor Ba and ABDor Bb. This result allowed us to determine the orbital parameters of both the relative and absolute orbits and, consequently, their individual dynamical masses: 0.28±0.05M_sun and 0.25±0.05M_sun, respectively. Conclusions. Comparisons of the dynamical masses with the prediction of PMS evolutionary models show that the models underpredict the dynamical masses of the binary components Ba and Bb by ~30 and 40%, respectively, although they all still agree at the 2-sigma level. The same stellar models favour an age between 50 and 100 Myr for this system. We also discuss the evolutionary status of ABDor Ba/Bb in terms of an earlier double-double star scenario that might explain the strong radio emission detected in both components
Assessing conservation priorities of xenarthrans in Argentina
In this study, we combine species distribution models with a reserve selection approach to assess the degree of representation of xenarthrans in the existing protected area network of Argentina, and to identify conservation priority areas that may help expand the current system. Species distribution models were developed from species’ occurrence records using a maximum entropy algorithm. Maps of species distributions were produced for 15 of the 16 species currently present in the country. To assess the performance of the existing protected area network in representing all modeled species, and to identify priority areas to expand the current reserve system, we used the software Zonation. Overall, all species modeled are represented in the existing protected area network. However, the percentage of their ranges covered by protected areas is very low (average = 6.7%; range = 1.7–17.6%). To represent at least 5% of the distribution of each species, 8.8% of the country’s area would be needed, and species with restricted ranges have the greatest increase in representation in this scenario. When 10% of the country is set aside for conservation, species representation increases considerably, again favoring range-restricted species. Most of the areas identified as conservation priorities are under strong anthropogenic pressures, including deforestation, agricultural expansion, and hunting. Our analysis provides a preliminary assessment of conservation priorities for the xenarthrans of Argentina, and we hope will serve as guideline to focus future conservation assessments at more refined scales.Facultad de Ciencias Naturales y Muse
Pre-Main Sequence stars in the star forming complex Sh 2-284
Located at the galactic anticenter, Sh 2-284 is a HII region which harbors
several young open clusters; Dolidze 25, a rare metal poor (Z~0.004) young
cluster, is one of these. Given its association with Sh 2-284, it is reasonable
to assume the low metallicity for the whole HII region. Sh~2-284 is expected to
host a significant population of Pre-Main Sequence (PMS) stars of both low and
intermediate mass stars (Herbig Ae stars). We aim at characterizing these stars
by means of a spectroscopic and photometric survey conducted with VIMOS@VLT and
complemented with additional optical and infrared observations. In this survey
we selected and characterized 23 PMS objects. We derived the effective
temperature, the spectral energy distribution and luminosity of these objects;
using theoretical PMS evolutionary tracks, with the appropriate metallicity, we
estimated the mass and the age of the studied objects. We also estimated a
distance of 4 Kpc for Sh 2-284 by using spectroscopic parallax of 3 OB stars.
From the age determination we concluded that triggered star formation is in act
in this region. Our results show that a significant fraction of the young
stellar objects (YSOs) may have preserved their disk/envelopes, in contrast
with what is found in other recent studies of low-metallicity star forming
regions in the Galaxy. Finally, among the 23 bona fide PMS stars, we identified
8 stars which are good candidates to pulsators of the delta Scuti type.Comment: accepted for publication in MNRA
Kepler-77b: a very low albedo, Saturn-mass transiting planet around a metal-rich solar-like star
We report the discovery of Kepler-77b (alias KOI-127.01), a Saturn-mass
transiting planet in a 3.6-day orbit around a metal-rich solar-like star. We
combined the publicly available Kepler photometry (quarters 1-13) with
high-resolution spectroscopy from the Sandiford@McDonald and FIES@NOT
spectrographs. We derived the system parameters via a simultaneous joint fit to
the photometric and radial velocity measurements. Our analysis is based on the
Bayesian approach and is carried out by sampling the parameter posterior
distributions using a Markov chain Monte Carlo simulation. Kepler-77b is a
moderately inflated planet with a mass of Mp=0.430+/-0.032 Mjup, a radius of
Rp=0.960+/-0.016 Rjup, and a bulk density of 0.603+/-0.055 g/cm^3. It orbits a
slowly rotating (P=36+/-6 days) G5V star with M*=0.95+/-0.04 Msun,
R*=0.99+/-0.02 Rsun, Teff=5520+/-60 K, [M/H]=0.20+/-0.05, that has an age of
7.5+/-2.0 Gyr. The lack of detectable planetary occultation with a depth higher
than about 10 ppm implies a planet geometric and Bond albedo of
Ag<0.087+/-0.008 and Ab<0.058+/-0.006, respectively, placing Kepler-77b among
the gas-giant planets with the lowest albedo known so far. We found neither
additional planetary transit signals nor transit-timing variations at a level
of about 0.5 minutes, in accordance with the trend that close-in gas giant
planets seem to belong to single-planet systems. The 106 transits observed in
short-cadence mode by Kepler for nearly 1.2 years show no detectable signatures
of the planet's passage in front of starspots. We explored the implications of
the absence of detectable spot-crossing events for the inclination of the
stellar spin-axis, the sky-projected spin-orbit obliquity, and the latitude of
magnetically active regions.Comment: 13 pages, 10 figures, 3 tables. Accepted for publication in A&A. This
version includes referee comments. Planet's name changed from KOI-127b to
Kepler-77
Pre-main-sequence isochrones -- I. The Pleiades benchmark
We present a critical assessment of commonly used pre-main-sequence
isochrones by comparing their predictions to a set of well-calibrated
colour-magnitude diagrams of the Pleiades in the wavelength range 0.4 to 2.5
microns. Our analysis shows that for temperatures less than 4000 K the models
systematically overestimate the flux by a factor two at 0.5 microns, though
this decreases with wavelength, becoming negligible at 2.2 microns. In optical
colours this will result in the ages for stars younger than 10 Myr being
underestimated by factors between two and three.
We show that using observations of standard stars to transform the data into
a standard system can introduce significant errors in the positioning of
pre-main-sequences in colour-magnitude diagrams. Therefore we have compared the
models to the data in the natural photometric system in which the observations
were taken. Thus we have constructed and tested a model of the system responses
for the Wide-Field Camera on the Isaac Newton Telescope.
As a benchmark test for the development of pre-main-sequence models we
provide both our system responses and the Pleiades sequence.Comment: 15 pages, 12 figures, 7 tables, accepted for publication in MNRAS.
All tables are available online at the Cluster Collaboration homepage
http://www.astro.ex.ac.uk/people/timn/Catalogues
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