Browsing Exact and Earth Sciences by Subject "Movimento estelar"
Now showing items 1-16 of 16
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18 Sco : a solar twin rich in refractory and neutron-capture elements, implications for chemical tagging
(2014) [Journal article]We study with unprecedented detail the chemical composition and stellar parameters of the solar twin 18 Sco in a strictly differential sense relative to the Sun. Our study is mainly based on high-resolution (R ∼ 110,000), ... -
Constraining the evolution of ZZ Ceti
(2003) [Journal article]We report our analysis of the stability of pulsation periods in the DAV star (pulsating hydrogen atmosphere white dwarf ) ZZ Ceti, also called R548. On the basis of observations that span 31 years, we conclude that the ... -
A fossil bulge globular cluster revealed by very large telescope multi-conjugate adaptive optics
(2011) [Journal article]The globular cluster HP 1 is projected on the bulge, very close to the Galactic center. The Multi-Conjugate Adaptive Optics Demonstrator on the Very Large Telescope allowed us to acquire high-resolution deep images that, ... -
Marvels-1 : a face-on double-lined binary star masquerading as a resonant planetary system and consideration of rare false positives in radial velocity planet searches
(2013) [Journal article]We have analyzed new and previously published radial velocity (RV) observations of MARVELS-1, known to have an ostensibly substellar companion in a ∼6 day orbit. We find significant (∼100ms-ˡ) residuals to the best-fit ... -
Measuring the evolution of the most stable optical clock G 117-B15A
(2005) [Journal article]We report our measurement of the rate of change of period with time (˙P ) for the 215 s periodicity in the pulsating white dwarf G 117-B15A, the most stable optical clock known. After 31 years of observations, we have ... -
Metallicity and radial velocity of the second parameter globular cluster Terzan 1 in the galactic bulge
(2002) [Journal article]Terzan 1 is the globular cluster with closest projection relative to the Galactic center. We report radial velocities and metallicities of 17 stars in order to investigate their membership in the cluster. From the 11 ... -
A microquasar shot out from its birth place
(2004) [Journal article]We show that the microquasar LS I +61° 303 is running away from its birth place in a young complex of massive stars. The supernova explosion that formed the compact object shot out the X-ray binary with a linear momentum ... -
Proper motion measurements as indicators of binarity in open clusers
(2005) [Journal article]We analyze 9 open clusters with ages in the range 70 Myr to 3.2Gyr using UCAC2 proper motion data and 2MASS photometry, which allows us to reach stellar masses down to ≈0.7 Mʘ. We employ in this work an approach in which ... -
SDSS-III : massive spectroscopic surveys of the distant universe, the Milk Way, and extra-solar planetary systems
(2011) [Journal article]Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program of four spectroscopic surveys on three scientific themes: dark energy and cosmological parameters, the history and structure of ... -
The eleventh and twelfth data releases of the Sloan Digital Sky Survey : final data from SDSS-III
(2015) [Journal article]The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new ... -
The physics of crystallization from globular cluster white dwarf stars in NGC 6397
(2009) [Journal article]We explore the physics of crystallization in the deep interiors of white dwarf (WD) stars using the color–magnitude diagram and luminosity function constructed from proper-motion cleaned Hubble Space Telescope photometry ... -
The proper motion of the globular cluster NGC 6553 and of bulge stars with the Hubble Space Telescope
(2001) [Journal article]WFPC2 images obtained with the Hubble Space Telescope (HST ) 4.16 years apart have allowed us to measure the proper motion of the metal-rich globular cluster NGC 6553 with respect to the background bulge stars. With a space ... -
Very low mass stellar and substellar companions to solar-like stars from MARVELS. I. A low-mass ratio stellar companion to TYC 4110-01037-1 in a 79 day orbit
(2012) [Journal article]TYC 4110-01037-1 has a low-mass stellar companion, whose small mass ratio and short orbital period are atypical among binary systems with solar-like (Teff 6000 K) primary stars. Our analysis of TYC 4110-01037-1 reveals it ... -
Very low mass stellar and substellar companions to solar-like stars from MARVELS. II. A short-period companios orbiting an F star with evidence of a stellar tertiary and significant mutual inclination
(2012) [Journal article]We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420±0.000006 days) companion to the F-type main-sequence star TYC 2930-00872-1. A long-term trend in the RV data also suggests the ... -
Very low mass stellar and substellar companions to solar-like stars from MARVELS. V. A low eccentricity brown dwarf from the driest part of the desert, marvels-6b
(2013) [Journal article]We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 ± 2.0 MJup to GSC 03546-01452 from the MARVELS radial velocity survey, which we designate as MARVELS-6b. For reasonable priors, ... -
Very-low-mass stellar and substellar companion to solar-like stars from MARVELS. III. A short-period brown dwarf cadidate around an active G0IV subgiant
(2013) [Journal article]We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature Teff = 5903±42 K, surface gravity log(g) = 4.07±0.16 (cgs), ...