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HCT/HESP study of two carbon stars from the LAMOST survey
Shi, Jianrong; Shejeelammal, J.; Goswami, Aruna
Carbon stars, enhanced in carbon and neutron-capture elements, provide a wealth of information about the nucleosynthesis history of the Galaxy. In this work, we present the first ever detailed abundance analysis of the carbon star LAMOSTJ091608.81+230734.6 and a detailed abundance analysis of neutron-capture elements for the object LAMOSTJ151003.7…
AB Aurigae: possible evidence of planet formation through the gravitational instability
Cadman, James; Hall, Cassandra; Rice, Ken
Recent observations of the protoplanetary disc surrounding AB Aurigae have revealed the possible presence of two giant planets in the process of forming. The young measured age of 1-4 Myr for this system allows us to place strict time constraints on the formation histories of the observed planets. Hence, we may be able to make a crucial distinctio…
Stellar population astrophysics (SPA) with the TNG. The Arcturus Lab
Dalessandro, E.; Sanna, N.; Mucciarelli, A. +4 more
Context. High-resolution spectroscopy in the near-infrared (NIR) is a powerful tool for characterising the physical and chemical properties of cool-star atmospheres. The current generation of NIR echelle spectrographs enables the sampling of many spectral features over the full 0.9-2.4 µm range for a detailed chemical tagging.
Aims: Wit…
Middle aged γ-ray pulsar J1957+5033 in X-rays: pulsations, thermal emission, and nebula
Karpova, A. V.; Zyuzin, D. A.; Suleimanov, V. F. +2 more
We analyse new XMM-Newton and archival Chandra observations of the middle-aged γ-ray radio-quiet pulsar J1957+5033. We detect, for the first time, X-ray pulsations with the pulsar spin period of the point-like source coinciding by position with the pulsar. This confirms the pulsar nature of the source. In the 0.15-0.5 keV band, there is a single p…
Strongly Lensed Supernova Refsdal: Refining Time Delays Based on the Supernova Explosion Models
Nomoto, Ken'ichi; Blinnikov, Sergei; Baklanov, Petr +1 more
We explore the properties of supernova (SN) "Refsdal"—the first discovered gravitationally lensed SN with multiple images. A large magnification provided by the galactic-scale lens, augmented by the cluster lens, gave us a unique opportunity to perform a detailed modeling of a distant SN at $z\simeq 1.5$ . We present results of radiation hydrodyna…
Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs
Martín, E. L.; Burgasser, A. J.; Masseron, T. +4 more
Aims: Our goals are to investigate the relative absorption strengths of ammonia and methane using low-resolution H-band (1.5−1.7 microns) spectra obtained in the laboratory and compared with observational spectra of late-T and Y dwarfs, and to estimate what can be expected from the wide-angle low-resolution near-infrared spectroscopic survey …
The VLT-MUSE and ALMA view of the MACS 1931.8-2635 brightest cluster galaxy
Ziegler, B. L.; Postman, M.; Donahue, M. +4 more
We reveal the importance of ongoing in situ star formation in the brightest cluster galaxy (BCG) in the massive cool-core CLASH cluster MACS 1931.8-2635 at a redshift of z = 0.35 by analysing archival VLT-MUSE optical integral field spectroscopy. Using a multi-wavelength approach, we assessed the stellar and warm ionised medium components, which w…
Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon
Magdis, G. E.; Rigopoulou, D.; Huang, J. -S. +5 more
We present the results of an integral field spectroscopy survey of a sample of dusty (ultra) luminous infrared galaxies (U/LIRGs) at 2 < z < 2.5 using KMOS on the Very Large Telescope. The sample has been drawn from Herschel deep field surveys and benefits from ancillary multiwavelength data. Our goal is to investigate the physical character…
A VLBA Survey of Radio Stars in the Orion Nebula Cluster. II. Astrometry
Menten, Karl M.; Forbrich, Jan; Reid, Mark J. +1 more
From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources in the Gaia DR2 catalog for 34 of them within 0"2 of the radio positions. Most of the radio sources are likely companions of G…
The Mercury Gamma-Ray and Neutron Spectrometer (MGNS) Onboard the Mercury Planetary Orbiter of the BepiColombo Mission: Design Updates and First Measurements in Space
Schulz, R.; Mitrofanov, I. G.; Kozyrev, A. S. +7 more
An updated set of goals and objectives for the Mercury Gamma and Neutron Spectrometer (MGNS) are presented based on the most recent findings of the MESSENGER mission. The updated design of MGNS with the new CeBr3 crystal for detection of gamma-ray along with its benefits for the detection of 40K and K/Th ratio are discussed. …