M. L. García-Vargas
A5052815358- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Scientific Measurement and Uncertainty Evaluation
- Optical Coatings and Gratings
- Mechanics and Biomechanics Studies
- Nuclear Physics and Applications
- Photonic and Optical Devices
- Pulsars and Gravitational Waves Research
- Phase Equilibria and Thermodynamics
- Geological and Geochemical Analysis
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Semiconductor Lasers and Optical Devices
- Particle Detector Development and Performance
Técnicas Reunidas (Spain)
2009-2024
Fractal Systems (Canada)
2023
Consejo Superior de Investigaciones Científicas
2010
Instituto de Astrofísica de Canarias
1997-2006
Gran Telescopio Canarias (Spain)
1998-2006
Universidad Autónoma de Madrid
1990-2000
Swiss Data Science Center
1999
CEA Paris-Saclay
1995-1998
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1995-1998
European Space Astronomy Centre
1997-1998
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the sample by publishing one spectrum each dwarf. These spectra cover wavelength range 520--1710nm at a resolution of least $R > 80,000$, and measure its RV, H$\alpha$ emission, projected rotation velocity. We an atlas high-resolution M-dwarf compare atmospheric models. To quantify RV precision that can be achieved in low-mass stars over range, analyze our...
We present new evolutionary synthesis models for Simple Stellar Populations a wide range of ages and metallicities. The are based on the Padova isochrones. core spectral library is provided by medium resolution Lejeune et al. atmosphere models. These spectra complemented NLTE hot stars that have an important impact in stellar cluster's ionizing spectra: O, B WR at early ages, post-AGB planetary nebulae, intermediate old ages. At young our compare well with other existing but we find that,...
Context. Teegarden's Star is the brightest and one of nearest ultra-cool dwarfs in solar neighbourhood. For its late spectral type (M7.0V), star shows relatively little activity a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part CARMENES search exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements analysed them planetary signals. Methods. We find periodic variability velocities Star. also studied photometric to rule out...
Context: The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M-dwarfs included in sample had been observed before with HIRES and HARPS either were reported have one short period planetary companion (GJ15A, GJ176, GJ436, GJ536 GJ1148) or are multiple systems (GJ581 GJ876). Aims: We aim report new precise optical radial velocity measurements for these planet hosts test overall capabilities CARMENES. Methods: combined our Doppler those available...
This paper represents a collective effort to provide an extensive electronic database useful for the interpretation of spectra and evolution galaxies. A broad variety empirical theoretical data are discussed here, made fully available in AAS CD-ROM Series, Vo. 7. Several stellar libraries part this database. They cover ultraviolet spectral range observed with IUE, optical from different ground-based telescopes, infrared data. Spectral type coverage depends on wavelength, but it is mostly...
view Abstract Citations (158) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Violent Star Formation in NGC 2363 Gonzalez-Delgado, Rosa M. ; Perez, Enrique Tenorio-Tagle, Guillermo Vilchez, Jose Terlevich, Elena Roberto Telles, Eduardo Rodriguez-Espinosa, Mas-Hesse, Miguel Garcia-Vargas, Maria Luisa Diaz, Angeles I. Cepa, Jordi Castaneda, Hector We present narrowband H-alpha imaging and long-slit optical near-infrared spectroscopy of the giant...
We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M 0.58 \pm 0.08$ M$_{\odot}$), bright M0.0V at distance of 10.7 pc, is found undergo periodic RV variations with semi-amplitude $K 5.1\pm0.4$ m s$^{-1}$ and period $P 86.54\pm0.06$ d. The signal in our data, which were taken between 2016 2017, supported HIRES/Keck that since 2000. are interpreted as...
Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants such stars, in agreement with core accretion theory of planet formation. Using precise radial velocities derived visual near-infrared spectra, we report the discovery a giant minimum mass 0.46 Jupiter masses an eccentric 204-day orbit very star GJ 3512. Dynamical models show high eccentricity is most likely explained planet-planet...
We present long-slit observations in the optical and near-infrared of eight H ii regions spiral galaxy NGC 4258. Six observed are located south-east inner arms, other two isolated northern outer arms. A detailed analysis physical conditions gas has been performed. For regions, an electron temperature derived from [S iii] Λ6312 line. rest, empirical calibration based on red sulphur lines used. The oxygen abundances by both methods found to be significantly lower (by a factor 2) than...
view Abstract Citations (96) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Starburst Galaxy NGC 7714 Gonzalez-Delgado, Rosa M. ; Perez, Enrique Diaz, Angeles I. Garcia-Vargas, Maria Luisa Terlevich, Elena Vilchez, Jose Narrowband Hα imaging and long-slit optical near-infrared spectroscopy are analyzed in a study of the starburst galaxy 7714. data indicate that as whole is experiencing intense star formation activity; this more...
This is the second paper of a series reporting results from popstar evolutionary synthesis models. Here, we present synthetic emission-line spectra H ii regions photoionized by young star clusters, for seven values cluster masses and ages between 0.1 5.2 Myr. The ionizing spectral energy distributions (SEDs) are those obtained code six different metallicities, with very low-metallicity set, Z= 0.0001, not included in previous similar works. We assume that radius region distance at which...
A high-resolution Hubble Space Telescope WFPC2 F218W UV image of the barred spiral NGC 4303 (classified as a LINER-type active galactic nucleus [AGN]) reveals for first time existence nuclear structure massive star-forming regions all way down to UV-bright unresolved core (size ≤ 8 pc) an galaxy.
We present our analysis of high-resolution (R $\sim$ 20 000) GTC/MEGARA integral-field unit spectroscopic observations, obtained during the commissioning run, in inner region (12.5 arcsec x 11.3 arcsec) active galaxy NGC7469, at spatial scales 0.62 arcsec. explore kinematics, dynamics, ionisation mechanisms and oxygen abundances ionised gas, by modelling H$α$-[NII] emission lines high signal-to-noise (>15) with multiple Gaussian components. MEGARA observations reveal, for first time...
Context. Feedback processes, in particular those driven by outflows, are believed to play a major role galaxy evolution. Outflows be ubiquitous all active galactic nuclei (AGNs), although their presence low luminosity AGNs, for Low-Ionisation Nuclear Emission line Regions (LINERs), has only started explored. Their properties (geometry, mass, and energetics) still far from being properly characterised. Aims. The main goal is use integral field spectroscopic data the MEGARA instrument at Gran...
We present high signal-to-noise ratio spectrophotometry obtained in the optical and near-infrared with double spectrograph ISIS on WHT, of M33 giant H ii region NGC 604. Our main aim was to deduce global properties a nearby region. The spectral range, central our study, comprises gravity-sensitive Ca triplet (CaT) stellar absorption features. data were using two different techniques: (1) scanning 1.75-arcmin-long slit that provided integrated spectra part nebula, (2) long-slit brightest...
We report IUE observations of two extremely low-metallicity H II galaxies. Ly α emission was detected in both Our results confirm previous findings that young or unevolved galaxies exhibit weak absent combined with a strong UV continuum, and the α/Hβ ratio metal content are correlated sense lower abundance, larger ratio. This supports hypothesis higher metallicity systems is destroyed by dust absorption. At redshifts between 2 3, comparable to strongest [L(Ly α) ~ 5×1042 erg s–1] would be...
MEGARA (<i>Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía</i>) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the 10.4m telescope in La Palma. offers two IFU fiber bundles, one covering 12.5x11.3 arcsec<sup>2</sup> with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) another 8.5x6.7 0.42 (Small SCB). The MOS mode will allow observing up to 100 objects region 3.5x3.5 arcmin<sup>2</sup> around bundles. Both LCB capabilities...
MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the 10.4m telescope in La Palma that being built by a Consortium led UCM (Spain) also includes INAOE (Mexico), IAA-CSIC (Spain), UPM (Spain). The instrument currently finishing AIV will be sent to on November 2016 its on-sky commissioning April 2017. IFU fiber bundle (LCB) covers 12.5x11.3 arcsec2 with spaxel size of 0.62 arcsec while...