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First detection of a magnetic field in low-luminosity B[e] stars. New scenarios for the nature and evolutionary stages of FS CMa stars
Manset, N.; Sestito, F.; Raj, A. +8 more
We report the first detection of the magnetic field in a star of FS CMa type, a subgroup of objects characterized by the B[e] phenomenon. The split of magnetically sensitive lines in IRAS 17449+2320 determines the magnetic field modulus of 6.2 ± 0.2 kG. Spectral lines and their variability reveal the presence of a B-type spectrum and a hot continu…
Gaussian process model for the local stellar velocity field from Gaia data release 2
Widrow, Lawrence M.; Nelson, Patrick
We model the local stellar velocity field using position and velocity measurements for 4M stars from the second data release of Gaia. We determine the components of the mean or bulk velocity in $\sim 27\, 000$ spatially defined bins. Our assumption is that these quantities constitute a Gaussian process where the correlation between the bulk veloci…
Unravelling UBC 274: A morphological, kinematical, and chemical analysis of a disrupting open cluster
Castro-Ginard, A.; Casamiquela, L.; Soubiran, C. +8 more
Context. Open clusters in the process of disruption help to understand the formation and evolution of the Galactic disk. The wealth and homogeneity of Gaia data have led to the discovery of several open clusters with signs of disruption. Detailed chemical information for these clusters is essential in order to study the timescales and interplay be…
Ultralight scalar dark matter detection with ZAIGA
Wang, Jin; Zhao, Wei; Mei, Xitong +2 more
Zhaoshan long-baseline atom interferometer gravitation antenna (ZAIGA) is a proposed underground long-baseline atom interferometer (AI) facility, aiming for experimental research on gravitation and related problems. In this paper, we study the possibility of detecting the ultralight scalar dark matter (DM) with ZAIGA. According to a popular scalar…
Flexible Models for Galaxy Star Formation Histories Both Shift and Scramble the Optical Color-Mass-to-light Ratio (M/L) Relationship
Leja, Joel; Li, Yijia
The remarkably tight relationship between galaxy optical color and stellar mass-to-light ratio (M */L) is widely used for efficient stellar mass estimates. However, it remains unclear whether this low scatter comes from a natural order in the galaxy population, or whether it is driven by simple relationships in the models used to descri…
Twin Extreme Ultraviolet Waves in the Solar Corona
Zhang, Liang; Chen, Yao; Zheng, Ruisheng +2 more
Solar extreme ultraviolet (EUV) waves are spectacular propagating disturbances with EUV enhancements in annular shapes in the solar corona. These EUV waves carry critical information about the coronal magnetized plasma that can shed light on the elusive physical parameters (e.g., the magnetic field strength) by global solar coronal magnetoseismolo…
SRG/eROSITA discovery of 164 s pulsations from the SMC Be/X-ray binary XMMU J010429.4-723136
Haberl, F.; Schwope, A.; Monageng, I. M. +5 more
Context. The Small Magellanic Cloud (SMC) hosts many known high-mass X-ray binaries (HMXBs), and all but one (SMC X-1) have a Be companion star. Through the calibration and verification phase of eROSITA on board the Spektrum-Roentgen-Gamma (SRG) spacecraft, the Be/X-ray binary XMMU J010429.4-723136 was in the field of view during observations of t…
Efficient dust radial drift around young intermediate-mass stars
Garufi, Antonio; Pinilla, Paola; Gárate, Matías
The radial velocities and direct imaging observations of exoplanets have suggested that the frequency of giant planets may decrease for intermediate-mass stars (2.5 − 8 M⊙). The key mechanism that could hinder their formation remains unclear. From a theoretical point of view, planet formation around intermediate-mass stars may take plac…
Average bolometric corrections and optical to X-ray flux measurements as a function of accretion rate for X-ray binaries
Zezas, A.; Steiner, J. F.; Reig, P. +1 more
In this paper, we use an RXTE library of spectral models from 10 black hole and 9 pulsar X-ray binaries, as well as model spectra available in the literature from 13 extra-galactic ultra-luminous X-ray sources (ULXs). We compute average bolometric corrections (BC = Lband/Lbol) for our sample as a function of different accreti…
A CaSSIS and HiRISE map of the Clay-bearing Unit at the ExoMars 2022 landing site in Oxia Planum
Quantin-Nataf, Cathy; Pajola, Maurizio; Cremonese, Gabriele +8 more
In preparation for the operations of the ExoMars Rosalind Franklin rover, characterising its landing site in Oxia Planum is essential. Of particular interest is the extensive Clay-bearing Unit present at the site, a key target in the search for biosignatures. In this paper we provide a map based on variations in colour and spectral information wit…