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Superorbital Modulation in the High-mass X-Ray Binary 4U 1538-52 and Possible Modulation in IGR J16393-4643
Roche, Paul; Pottschmidt, Katja; Corbet, Robin H. D. +2 more
Hard X-ray observations with the Neil Gehrels Swift Observatory Burst Alert Telescope (BAT) reveal superorbital modulation in the wind-accreting supergiant high-mass X-ray binary (HMXB) 4U 1538-52 at a period of 14.9130 ± 0.0026 days that is consistent with four times the 3.73 day orbital period. These periods agree with a previously suggested cor…
Investigation and application of fitting models for centering algorithms in astrometry
Lin, F. R.; Peng, Q. Y.; Zheng, Z. J. +2 more
To determine the precise positions of stars in CCD frames, various centering algorithms have been proposed for astrometry. The effective point spread function (ePSF) and the Gaussian centering algorithms are two representative centering algorithms. This paper compares in detail and investigates these two centering algorithms in performing data red…
NGTS and HST insights into the long-period modulation in GW Librae
Reichart, D. E.; Hermes, J. J.; Gänsicke, B. T. +17 more
Light curves of the accreting white dwarf pulsator GW Librae spanning a 7.5-month period in 2017 were obtained as part of the Next-Generation Transit Survey. This data set comprises 787 h of photometry from 148 clear nights, allowing the behaviour of the long (hours) and short-period (20 min) modulation signals to be tracked from night to night ov…
Ultraviolet Imaging Telescope (UVIT) observation of the Galactic globular cluster NGC 7492
Pradhan, Ananta C.; Mohapatra, Abhisek; Parthasarathy, M. +4 more
We present detailed photometric observations of the Galactic globular cluster NGC 7492 using the data obtained with two far-ultraviolet (FUV; 1300-1800 Å) and three near-ultraviolet (NUV; 2000-3000 Å) filters of Ultraviolet Imaging Telescope (UVIT) onboard the AstroSat satellite. We confirmed the cluster membership of the extracted sources using G…
Star cluster survival in dark matter haloes: an old cluster in Eridanus II?
Alzate, Jairo A.; Bruzual, Gustavo; Lomelí-Núñez, Luis +2 more
The star formation history and the internal dynamics of Milky Way satellite galaxies are often complicated. In the last years, a substantial fraction of the known faint dwarf satellites have been studied. Some of them show embedded stellar substructures, such as star clusters and even globular star clusters. In this work, we study Eridanus II, a d…
Revisiting the Spectral Features of Ellerman Bombs and UV Bursts. I. Radiative Hydrodynamic Simulations
Ding, M. D.; Li, Ying; Hong, Jie +1 more
Ellerman bombs (EBs) and UV bursts are both small-scale solar activities that occur in active regions. They are now believed to form at different heights in the lower atmosphere. In this paper, we use one-dimensional radiative hydrodynamic simulations to calculate various line profiles in response to heating in different atmospheric layers. We con…
Science Commissioning of NIHTS: The Near-infrared High Throughput Spectrograph on the Lowell Discovery Telescope
Cushing, Michael C.; Gustafsson, Annika; Moskovitz, Nicholas +3 more
The Near-Infrared High Throughput Spectrograph (NIHTS) is in operation on the 4.3 m Lowell Discovery Telescope (LDT) in Happy Jack, AZ. NIHTS is a low-resolution spectrograph (R ∼ 200) that operates from 0.86 to 2.45 microns. NIHTS is fed by a custom dichroic mirror which reflects near-infrared wavelengths to the spectrograph and transmits the vis…
Exploring the pulsational properties of two ZZ Ceti stars
Sódor, Á.; Kalup, Cs.; Bognár, Zs.
Context. We continued our ground-based observing project with the season-long observations of ZZ Ceti stars at the Konkoly Observatory. Our present targets are the newly discovered PM J22299+3024 and the already known LP 119-10 variables. LP 119-10 was also observed by the TESS space telescope in 120-second cadence mode.
Aims: Our main aims a…
Effects of the chromospheric Lyα line profile shape on the determination of the solar wind H I outflow velocity using the Doppler dimming technique
Sasso, C.; Romoli, M.; Andretta, V. +15 more
Context. The determination of solar wind H I outflow velocity is fundamental to shedding light on the mechanisms of wind acceleration occurring in the corona. Moreover, it has implications in various astrophysical contexts, such as in the heliosphere and in cometary and planetary atmospheres.
Aims: We aim to study the effects of the chromosph…
Constraints on Optical Emission of FAST-detected FRB 20181130B with GWAC Synchronized Observations
Huang, L.; Wang, J.; Li, H. L. +17 more
Multiwavelength simultaneous observations are essential to the constraints on the origin of fast radio bursts (FRBs). However, it is a significant observational challenge due to the nature of FRBs as transients with a radio millisecond duration, which occur randomly in the sky regardless of time and position. Here, we report the search for short-t…