Search Publications
The relative supernovae contribution to the chemical enrichment history of Abell 1837
Hudaverdi, M.; Erdim, M. K.; Ezer, C. +2 more
In this paper, we report the relative supernovae (SNe) contribution to the metal budget of the intracluster medium (ICM) of the Abell 1837 galaxy cluster at redshift z = 0.069. For this purpose, we analysed the hot ICM of the cluster and obtained radial metal distributions using XMM-Newton archival data with a total exposure of ~100 ks. These meta…
Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy
Mahadevan, Suvrath; Terrien, Ryan; Lind, Karin +15 more
We have used the Habitable Zone Planet Finder (HPF) to gather high-resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal branch (RHB) stars, one open cluster giant, and one very metal-poor halo red giant. The HPF spectra cover the 0.81-1.28 µm wavelength range of the zyJ bands, partially filling the gap between th…
Quiet-time low energy ion spectra observed on Solar Orbiter during solar minimum
Kulkarni, S. R.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +32 more
Context. The Solar Orbiter spacecraft cruised in the inner heliosphere during Feb. 2020 - Jan. 2021, moving between ∼0.5-1.0 au radial distance. The Energetic Particle Detector suite operated continuously during this period.
Aims: The Suprathermal Ion Spectrograph and High Energy Telescope observations made during intervals in between transie…
A discontinuity in the luminosity-mass relation and fluctuations in the evolutionary tracks of low-mass and low-metallicity stars at the Gaia M-dwarf gap
Kroupa, Pavel; Mansfield, Santana
Context. The Gaia M-dwarf gap is a recently discovered feature in the colour-magnitude diagram that shows a deficiency of low-mass and low-metallicity stars at the lower end of the main sequence.
Aims: We aim at performing theoretical stellar modelling at low metallicities using a fine mass step and a fine time step, looking specifically for …
Registration and imaging polarimetry of the Fe 6374 Å red coronal line during the 2017 total solar eclipse
Li, S. Y.; Qu, Z. Q.; Liang, Y. +3 more
Strict registration is critical for imaging polarimetry; a highly accurate registration approach to the coronal image and imaging polarimetry of the Fe 6374 Å red coronal line have been researched in this paper. In order to improve the registration accuracy, this paper proposes the idea of image enhancement based on blind deconvolution combined wi…
Searching for Fermi GRB optical counterparts with the prototype Gravitational-wave Optical Transient Observer (GOTO)
Mullaney, J.; Ulaczyk, K.; Pallé, E. +45 more
The typical detection rate of ~1 gamma-ray burst (GRB) per day by the Fermi Gamma-ray Burst Monitor (GBM) provides a valuable opportunity to further our understanding of GRB physics. However, the large uncertainty of the Fermi localization typically prevents rapid identification of multiwavelength counterparts. We report the follow-up of 93 Fermi …
DEATHSTAR: nearby AGB stars with the Atacama Compact Array. II. CO envelope sizes and asymmetries: the S-type stars
Lindqvist, M.; Olofsson, H.; Sahai, R. +13 more
Aims: We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively.
Methods: We map the emission from the CO J = 2-1 and 3-2 lines observed with the Atacama Compact Array…
Subaru Hyper Suprime-Cam Survey of Cygnus OB2 Complex - I. Introduction, photometry, and source catalogue
Herczeg, Gregory J.; Jose, Jessy; Pyo, Tae-Soo +11 more
Low-mass star formation inside massive clusters is crucial to understand the effect of cluster environment on processes like circumstellar disc evolution, planet, and brown dwarf formation. The young massive association of Cygnus OB2, with a strong feedback from massive stars, is an ideal target to study the effect of extreme environmental conditi…
BRITE observations of ν Centauri and γ Lupi, the first non-eclipsing members of the new class of nascent binaries
Handler, G.; Wade, G. A.; Pigulski, A. +8 more
Results of an analysis of the BRITE-Constellation and Solar Mass Ejection Imager photometry and radial-velocity observations, archival and new, of two single-lined spectroscopic binary (SB) systems ν Centauri and γ Lupi are reported. In the case of γ Lup AB, a visual binary, an examination of the light-time effect shows that component A is the SB.…
NOEMA Observations of CO Emission in Arp 142 and Arp 238
Xu, C. K.; Lisenfeld, U.; Gao, Y. +1 more
Previous studies have shown significant differences in the enhancement of the star formation rate (SFR) and star formation efficiency (SFE = SFR/Mmol) between spiral-spiral and spiral-elliptical mergers. In order to shed light on the physical mechanism of these differences, we present NOEMA observations of the molecular gas distribution…