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Multiple Populations in Low-mass Globular Clusters: Palomar 13
Carballo-Bello, Julio A.; Li, Chengyuan; Cabrera-Lavers, Antonio +7 more
Since the discovery of chemically peculiar stars in globular clusters in the last century, the study of multiple populations has become increasingly important, given that chemical inhomogeneity is found in almost all globular clusters. Despite various proposed theories attempting to explain this phenomenon, fitting all the observational evidence i…
Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager
Paunzen, E.; Prišegen, M.; Bernhard, K. +2 more
Since the discovery of the spectral peculiarities of their prototype α2 Canum Venaticorum in 1897, the so-called ACV variables, which are comprised of several groups of chemically peculiar stars of the upper main sequence, have been the target of numerous photometric and spectroscopic studies. Especially for the brighter ACV variables, …
Towards a robust estimation of orientation parameters between ICRF and Gaia celestial reference frames
Malkin, Zinovy
An analysis of the source position differences between very long baseline interferometry-based ICRF and Gaia-celestial reference frame catalogues is a key step in assessing their systematic errors and determining their mutual orientation. One of the main factors that limits the accuracy of determination of the orientation parameters between two fr…
Dense gas in local galaxies revealed by multiple tracers
Li, Juan; Gong, Yan; Li, Shanghuo +6 more
We present 3 mm and 2 mm band simultaneously spectroscopic observations of HCN 1-0, HCO+ 1-0, HNC 1-0, and CS 3-2 with the IRAM 30 m telescope, towards a sample of 70 sources as nearby galaxies with infrared luminosities ranging from several 10$^{5}\, \mathrm{L}_{\odot }$ to more than 10$^{12}\, \mathrm{L}_{\odot }$. After combining HCN…
Caldera Collapse as the Trigger of Chaos and Fractured Craters on the Moon and Mars
Massironi, Matteo; Rossi, Angelo Pio; Pozzobon, Riccardo +3 more
Chaotic terrains are broad regions on Mars characterized by the disruption of the basaltic bedrock into polygonal blocks separated by deep fractures. To date, the proposed genetic scenarios often involve the occurrence of subsurface ice or liquid H2O. Nevertheless, similar features also occur within some craters on the Moon, namely floo…
The Initial-Final Mass Relation for Hydrogen-deficient White Dwarfs
Bolte, Michael; Williams, Kurtis A.; Barnett, Joseph W. +1 more
The initial-final mass relation represents the total mass lost by a star during the entirety of its evolution from the zero age main sequence to the white-dwarf cooling track. The semiempirical initial-final mass relation (IFMR) is largely based on observations of DA white dwarfs, the most common spectral type of white dwarf and the simplest atmos…
Chemical Analysis of Two Extremely Metal-poor Stars HE 2148-2039 and HE 2155-2043
Goswami, Aruna; Purandardas, Meenakshi
We present elemental abundance results for HE 2148-2039 and HE 2155-2043 based on a detailed high-resolution spectroscopic analysis. The high-resolution Subaru/High Dispersion Spectrograph (HDS) spectra used for our analysis have a resolution of R ∼ 60,000. Although limited information based on photometry and low-resolution spectroscopy is availab…
Hubble Space Telescope imaging of the extremely metal-poor globular cluster EXT8 in Messier 31
Romanowsky, Aaron J.; Brodie, Jean P.; Larsen, Søren S.
We recently found the globular cluster (GC) EXT8 in M 31 to have an extremely low metallicity of [Fe/H] = −2.91 ± 0.04 using high-resolution spectroscopy. Here we present a colour-magnitude diagram (CMD) for EXT8, obtained with the Wide Field Camera 3 on board the Hubble Space Telescope. Compared with the CMDs of metal-poor Galactic GCs, we find t…
Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network
Ruiz, Javier; Maehara, Hiroyuki; Namekata, Kosuke +58 more
We present spectroscopic and photometric observations of 17 dwarf-nova superoutbursts obtained by KOOLS-IFU mounted on the 3.8 m telescope Seimei at the Okayama Observatory of Kyoto University and through the Variable Star Network collaboration (VSNET). Our spectroscopic observations for six outbursts were performed within 1 d of their optical pea…
Energetic particle evolution during coronal mass ejection passage from 0.3 to 1 AU
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +21 more
We provide analysis of a coronal mass ejection (CME) that passed over Parker Solar Probe (PSP) on January 20, 2020 when the spacecraft was at just 0.32 AU. The Integrated Science Investigation of the Sun instrument suite measures energetic particle populations associated with the CME before, during, and after its passage over the spacecraft. We ob…