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TITANS metal-poor reference stars. I. Accurate effective temperatures and surface gravities for dwarfs and subgiants from 3D non-LTE Hα profiles and Gaia parallaxes
Smiljanic, R.; da Silva, A. R.; Giribaldi, R. E. +1 more
Context. Several large stellar spectroscopic surveys are producing enormous amounts of data that can be used to determine stellar atmospheric parameters and chemical abundances. Nonetheless, the accuracy achieved in the derived astrophysical parameters is still insufficient, mainly because of the paucity of adequate calibrators, particularly in th…
New mercury-manganese stars and candidates from LAMOST DR4
Paunzen, E.; Bernhard, K.; Hümmerich, S.
Aims: The present work presents our efforts at identifying new mercury-manganese (HgMn/CP3) stars using spectra obtained with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST).
Methods: Suitable candidates were searched for among pre-selected early-type spectra from LAMOST DR4 using a modified version of the MKCLASS …
Exploring Mutual Information between IRIS Spectral Lines. I. Correlations between Spectral Lines during Solar Flares and within the Quiet Sun.
Kleint, Lucia; Panos, Brandon; Voloshynovskiy, Sviatoslav
Spectral lines allow us to probe the thermodynamics of the solar atmosphere, but the shape of a single spectral line may be similar for different thermodynamic solutions. Multiline analyses are therefore crucial, but computationally cumbersome. We investigate correlations between several chromospheric and transition region lines to restrain the th…
Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA
Carniani, Stefano; Rosati, Piero; Meneghetti, Massimo +10 more
We report on ALMA observations of D1, a system at z ~ 6.15 with stellar mass $M_{*} \sim 10^7 \, \mathrm{M}_{\odot }$ containing globular cluster (GC) precursors, strongly magnified by the galaxy cluster MACS J0416.1-2403. Since the discovery of GC progenitors at high redshift, ours is the first attempt to probe directly the physical properties of…
The formation of the young massive cluster B1 in the Antennae Galaxies (NGC 4038/NGC 4039) triggered by cloud-cloud collision
Tokuda, Kazuki; Tachihara, Kengo; Ueda, Junko +4 more
The Antennae Galaxies, one of major mergers, are a starburst. Tsuge et al. (2020, PASJ, 73, S35) showed that the five giant molecular complexes in the Antennae Galaxies have signatures of cloud-cloud collisions based on the Atacama Large Millimeter Array (ALMA) archival data with 60 pc resolution. In the present work we analyzed the new CO data to…
Multi-Wavelength Properties of the 2021 Periastron Passage of PSR B1259-63
Santangelo, Andrea; Pühlhofer, Gerd; Chernyakova, Maria +9 more
PSR B1259-63 is a gamma-ray binary system hosting a radio pulsar orbiting around a O9.5Ve star, LS 2883, with a period of ∼3.4 years. The interaction of the pulsar wind with the LS 2883 outflow leads to unpulsed broadband emission in the radio, X-ray, GeV, and TeV domains. One of the most unusual features of the system is an outburst of GeV energi…
Coherent radio emission from a population of RS Canum Venaticorum systems
Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K. +5 more
Coherent radio emission from stars can be used to constrain fundamental coronal plasma parameters, such as plasma density and magnetic field strength. It is also a probe of chromospheric and magnetospheric acceleration mechanisms. Close stellar binaries, such as RS Canum Venaticorum (RS CVn) systems, are particularly interesting as their heightene…
The ultraluminous X-ray source bubble in NGC 5585
Motch, C.; Miller-Jones, J. C. A.; Soria, R. +4 more
Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources. We illustrate the most recent addition to this class: a huge (350 pc × 220 pc in diameter) bubble around a ULX in NGC 5…
A global view on star formation: the GLOSTAR Galactic plane survey. III. 6.7 GHz methanol maser survey in Cygnus X
Beuther, Henrik; Wyrowski, Friedrich; Gong, Yan +16 more
The Cygnus X complex is covered by the Global View of Star Formation in the Milky Way (GLOSTAR) survey, an unbiased radio-wavelength Galactic plane survey, in 4-8 GHz continuum radiation and several spectral lines. The GLOSTAR survey observed the 6.7 GHz transition of methanol (CH3OH), an exclusive tracer of high-mass young stellar obje…
Multiplicity among the cool supergiants in the Magellanic Clouds
Dorda, R.; Patrick, L. R.
The characterization of multiplicity of high-mass stars is of fundamental importance to understand their evolution, the diversity of observed core-collapse supernovae and the formation of gravitational wave progenitor systems. Despite that, until recently, one of the final phases of massive star evolution - the cool supergiant phase - has received…