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…
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 …
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.…
APOGEE view of the globular cluster NGC 6544
Minniti, D.; Bizyaev, D.; Zoccali, M. +16 more
The second phase of the APOGEE survey is providing near-infrared (near-IR), high-resolution, high signal-to-noise spectra of stars in the halo, disc, bar, and bulge of the Milky Way. The near-IR spectral window is especially important in the study of the Galactic bulge, where stars are obscured by the dust and gas of the disc in its line of sight.…
Dark cloud-type chemistry in photodissociation regions with moderate ultraviolet field
Kirsanova, Maria S.; Vasyunin, Anton I.; Semenov, Dmitry A. +1 more
We present a study of emission lines of small hydrocarbons C2H and c-C3H2, and COMs precursors H2CO and CH3OH in order to better understand the possible chemical link between the molecular abundances and UV radiation field in photodissociation regions (PDRs). We study two PDRs around extended …
Evolution of brightness and magnetic features of young solar-type stars - I. The young G star HIP 89829
Jeffers, S. V.; Piskunov, N.; Hébrard, E. M. +7 more
The evolution in latitude of sunspots is a key feature of the cyclic solar dynamo. Here, we present the results of a spectroscopic and spectropolarimetric monitoring campaign on the young (~20 Myr old) early G star HIP 89829, in order to investigate potential evolution in the distribution of the star's spots and magnetic features. Our analysis of …
New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars
Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus +1 more
The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with this development. Here we show that the 'upside-down CBH variables', which were proposed as a potentially new class of variable stars by Heinze et al. in the ATLAS First…
Nova LMC 2009a as observed with XMM-Newton, compared with other novae
Ness, Jan-Uwe; Behar, Ehud; Pinto, Ciro +9 more
We examine four high-resolution reflection grating spectrometers (RGS) spectra of the February 2009 outburst of the luminous recurrent nova LMC 2009a. They were very complex and rich in intricate absorption and emission features. The continuum was consistent with a dominant component originating in the atmosphere of a shell burning white dwarf (WD…