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AlH lines in the blue spectrum of Proxima Centauri
(2022-11-30)
The recently-computed ExoMol line lists for isotopologues of AlH are used to analyse the blue spectrum (4000-4500 {\AA}) of Proxima Cen (M5.5 V). Comparison of the observed and computed spectra enables the identification ...
Mira variables in the Milky Way’s nuclear stellar disc: discovery and classification
(2022-11-30)
The properties of the Milky Way's nuclear stellar disc give crucial information on the epoch of bar formation. Mira variables are promising bright candidates to study the nuclear stellar disc, and through their period-age ...
The role of mass loss in chemodynamical evolution of galaxies
(2022-11-30)
Thanks to the long-term collaborations between nuclear and astrophysics, we have good understanding on the origin of elements in the universe, except for the elements around Ti and some neutron-capture elements. From the ...
A Comparative L-dwarf Sample Exploring the Interplay Between Atmospheric Assumptions and Data Properties
(2022-10-13)
Comparisons of atmospheric retrievals can reveal powerful insights on the strengths and limitations of our data and modeling tools. In this paper, we examine a sample of 5 similar effective temperature (Teff) or spectral ...
Non-LTE abundance corrections for late-type stars from 2000Å to 3μm I. Na, Mg, and Al
(2022-09-28)
It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Accurate abundance determination requires taking those effects into account, but the necessary non-LTE calculations are often ...
The JCMT Transient Survey : Single Epoch Transients and Variability of Faint Sources
(2022-09-15)
Short-duration flares at millimeter wavelengths provide unique insights into the strongest magnetic reconnection events in stellar coronae, and combine with longer-term variability to introduce complications to next-generation ...
Could kilomasers pinpoint supermassive stars?
(2022-09-11)
A strong nuclear kilomaser, W1, has been found in the nearby galaxy NGC 253, associated with a forming super star cluster. Kilomasers could arise from the accretion disc around supermassive stars (>10^3 Msun), hypothetical ...
Evidence of distant spiral arms in the Galactic disk quadrant IV from VVV red clump giants
(2022-09-09)
The discovery of new clear windows in the Galactic plane using the VVV near-IR extinction maps allows the study of the structure of the Milky Way (MW) disk. The ultimate goal of this work is to map the spiral arms in the ...
Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8
(2022-06-23)
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low Resolution Spectroscopic Survey (LRS) provides massive spectroscopic data of M-type stars, and the derived stellar parameters could bring vital ...
Non-thermal radio continuum emission from young nearby stars
(2022-05-23)
Young and magnetically active low-mass stars often exhibit non-thermal coronal radio emission due to the gyration of electrons in their magnetized chromospheres. This emission is easily detectable at centimeter wavelengths ...