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Photometric, kinematic, and variability study in the young open cluster NGC 1960
Joshi, Y. C.; Maurya, J.; Panchal, A. +3 more
We present a comprehensive photometric analysis of a young open cluster NGC 1960 (= M36) along with the long-term variability study of this cluster. Based on the kinematic data of Gaia DR2, the membership probabilities of 3871 stars are ascertained in the cluster field among which 262 stars are found to be cluster members. Considering the kinemati…
Jurassic: A chemically anomalous structure in the Galactic halo
Beers, Timothy C.; Minniti, Dante; Fernández-Trincado, José G.
Detailed elemental-abundance patterns of giant stars in the Galactic halo measured by the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) have revealed the existence of a unique and significant stellar subpopulation of silicon-enhanced ([Si/Fe] ≳ +0.5) metal-poor stars, spanning a wide range of metallicities (-1.5 ≲ [Fe/H] ≲ -0.8…
The role of Galactic H II regions in the formation of filaments. High-resolution submilimeter imaging of RCW 120 with ArTéMiS
Roussel, H.; André, Ph.; Arzoumanian, D. +13 more
Context. Massive stars and their associated ionized (H II) regions could play a key role in the formation and evolution of filaments that host star formation. However, the properties of filaments that interact with H II regions are still poorly known.
Aims: To investigate the impact of H II regions on the formation of filaments, we imaged the…
Using Data Imputation for Signal Separation in High-contrast Imaging
Debes, John H.; Duchêne, Gaspard; Perrin, Marshall D. +5 more
To characterize circumstellar systems in high-contrast imaging, the fundamental step is to construct a best point-spread function (PSF) template for the noncircumstellar signals (I.e., starlight and speckles) and separate it from the observation. With existing PSF construction methods, the circumstellar signals (e.g., planets, circumstellar disks)…
Stellar Cores in the Sh 2-305 H II Region
Pandey, Rakesh; Sharma, Saurabh; Panwar, Neelam +6 more
Using our deep optical and near-infrared photometry along with multiwavelength archival data, we here present a detailed study of the Galactic H II region Sh 2-305 to understand the star/star-cluster formation. On the basis of excess infrared emission, we have identified 116 young stellar objects (YSOs) within a field of view of ∼18'5 × 18'5 aroun…
Flux Erosion of Magnetic Clouds by Reconnection With the Sun's Open Flux
Nandy, Dibyendu; Pal, Sanchita; Dash, Soumyaranjan
Magnetic clouds (MCs) are flux rope magnetic structures forming a subset of solar coronal mass ejections, which have significant space weather impacts. The geoeffectiveness of MCs depends on their properties, which evolve during their interplanetary passage. Based on an analysis of observations spanning two solar cycles, we establish that MCs inte…
Simultaneous Optical Transmission Spectroscopy of a Terrestrial, Habitable-zone Exoplanet with Two Ground-based Multiobject Spectrographs
Charbonneau, David; Kempton, Eliza M. -R.; Diamond-Lowe, Hannah +2 more
Investigating the atmospheres of rocky exoplanets is key to performing comparative planetology between these worlds and the terrestrial planets that reside in the inner solar system. Terrestrial exoplanet atmospheres exhibit weak signals, and attempting to detect them pushes at the boundaries of what is possible for current instrumentation. We foc…
Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars
Henry, Todd J.; van Belle, Gerard T.; Winters, Jennifer G. +13 more
We report 370 measures of 170 components of binary and multiple-star systems, obtained from speckle imaging observations made with the Differential Speckle Survey Instrument at Lowell Observatory's Discovery Channel Telescope in 2015 through 2017. Of the systems studied, 147 are binary stars, 10 are seen as triple systems, and 1 quadruple system i…
An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio Correlation for High-redshift Dusty Star-forming Galaxies
Smail, I.; Thomson, A. P.; Scott, D. +17 more
We study the radio properties of 706 submillimeter galaxies (SMGs) selected at 870 µm with the Atacama Large Millimeter Array from the SCUBA-2 Cosmology Legacy Survey map of the Ultra Deep Survey field. We detect 273 SMGs at >4σ in deep Karl G. Jansky Very Large Array 1.4 GHz observations, of which a subset of 45 SMGs are additionally det…
Application of Synoptic Magnetograms to Global Solar Activity Forecast
Kitiashvili, I. N.
Synoptic magnetograms provide us with knowledge about the evolution of magnetic fields on the solar surface and present important information for forecasting future solar activity. In this work, poloidal and toroidal magnetic field components derived from synoptic magnetograms are assimilated, using the Ensemble Kalman Filter method, into a mean-f…