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Radio and optical observations of the possible AE Aqr twin, LAMOST J024048.51+195226.9
Knigge, C.; Heywood, I.; Hewitt, D. M. +8 more
It was recently proposed that the cataclysmic variable (CV) LAMOST J024048.51+195226.9 may be a twin to the unique magnetic propeller system AE Aqr. If this is the case, two predictions are that it should display a short period white dwarf spin modulation, and that it should be a bright radio source. We obtained follow-up optical and radio observa…
The Gaia spectrophotometric standard stars survey - IV. Results of the absolute photometry campaign
Jordi, C.; Monguió, M.; Rainer, M. +18 more
We present Johnson-Kron-Cousins BVRI photometry of 228 candidate spectrophotometric standard stars for the external (absolute) flux calibration of Gaia data. The data were gathered as part of a 10-yr observing campaign with the goal of building the external grid of flux standards for Gaia and we obtained absolute photometry, relative photometry fo…
RX J0529.8-6556: a BeXRB pulsar with an evolving optical period and out of phase X-ray outbursts
Haberl, F.; Udalski, A.; Ray, P. S. +12 more
We report the results of eROSITA and NICER observations of the 2020 June outburst of the Be/X-ray binary pulsar RX J0529.8-6556 in the Large Magellanic Cloud, along with the analysis of archival X-ray and optical data from this source. We find two anomalous features in the system's behaviour. First, the pulse profile observed by NICER during maxim…
A parsec-scale faint jet in the nearby changing-look Seyfert galaxy Mrk 590
Komossa, S.; Paragi, Zsolt; Yuan, Feng +9 more
Broad Balmer emission lines in active galactic nuclei (AGN) may display dramatic changes in amplitude, even disappearance and re-appearance in some sources. As a nearby galaxy at a redshift of z = 0.0264, Mrk 590 suffered such a cycle of Seyfert type changes between 2006 and 2017. Over the last 50 yr, Mrk 590 also underwent a powerful continuum ou…
Superresolving Herschel imaging: a proof of concept using Deep Neural Networks
Serjeant, Stephen; Wang, Wei-Hao; Lim, Chen-Fatt +4 more
Wide-field submillimetre surveys have driven many major advances in galaxy evolution in the past decade, but without extensive follow-up observations the coarse angular resolution of these surveys limits the science exploitation. This has driven the development of various analytical deconvolution methods. In the last half a decade Generative Adver…
Characterizing the magnetic fields of nearby molecular clouds using submillimeter polarization observations
Soler, J. D.; Fissel, L. M.; Li, Z. -Y. +3 more
Of all the factors that influence star formation, magnetic fields are perhaps the least well understood. The goal of this paper is to characterize the 3D magnetic field properties of nearby molecular clouds through various methods of statistically analysing maps of polarized dust emission. Our study focuses on nine clouds, with data taken from the…
Determination of Planetary Nebulae angular diameters from radio continuum spectral energy distribution modelling
Filipović, M. D.; Galvin, T. J.; Parker, Q. A. +2 more
Powerful new, high-resolution, high-sensitivity, multifrequency, wide-field radio surveys such as the Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe are emerging. They will offer fresh opportunities to undertake new determinations of useful parameters for various kinds of extended astrophysical phenomena. Her…
Lithium in red giants: the roles of the He-core flash and the luminosity bump
Lambert, David L.; Deepak
Lithium abundances for red giants in the GALAH DR3 survey are studied. The rare examples of Li-enriched stars with abundances A(Li) ≥1.5 are confirmed to be He-core burning stars belonging to or evolved from the red clump with similar masses and metallicity: M ≃ 1.1 ± 0.2 M⊙ and [Fe/H] ≃ -0.3 ± 0.3. Li enrichment over the Li abundance p…
Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection
Tamura, M.; Pallé, E.; Béjar, V. J. S. +24 more
Up to now, WASP-12b is the only hot Jupiter confirmed to have a decaying orbit. The case of WASP-43b is still under debate. Recent studies preferred or ruled out the orbital decay scenario, but further precise transit timing observations are needed to definitively confirm or refute the period change of WASP-43b. This possibility is given by the Tr…
The GALAH+ survey: a new library of observed stellar spectra improves radial velocities and hints at motions within M67
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +25 more
GALAH+ is a magnitude-limited survey of high-resolution stellar spectra obtained by the HERMES spectrograph at the Australian Astronomical Observatory. Its third data release provides reduced spectra with new derivations of stellar parameters and abundances of 30 chemical elements for 584 015 dwarfs and giants, 88 per cent of them in the Gaia magn…