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Deriving physical parameters of unresolved star clusters. VII. Adaptive aperture photometry of the M 31 PHAT star clusters
Stonkutė, Rima; Vansevičius, Vladas; Kriščiūnas, Eimantas +1 more
Context. This work is the seventh study in a series dedicated to investigating degeneracies of simultaneous age, mass, extinction, and metallicity determinations of partially resolved or unresolved star clusters with Hubble Space Telescope broadband aperture photometry. In the sixth work (hereafter, Paper I), it was demonstrated that the adaptive …
A uvbyCaHβ CCD Analysis of the Open Cluster Standard, M67, and Its Relation to NGC 752
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P.
Precision CCD uvbyCaHβ photometry is presented of the old cluster, M67, covering one square degree with typical internal precision at the 0.005-0.020 mag level to V ~ 17. The photometry is calibrated using standards over a wide range in luminosity and temperature from NGC 752 and zeroed to the standard system via published photoelectric observatio…
Discovery of a New Molecular Bubble-Outflow Structure in the Taurus B18 Cloud
Ching, Tao-Chung; Duan, Yan; Li, Di +5 more
Star formation can produce bubbles and outflows, as a result of stellar feedback. Outflows and bubbles inject momentum and energy into the surrounding interstellar medium, and so are related to the overall energy balance of the molecular cloud. Molecular bubbles can be resolved by higher-resolution radio telescopes to quantify the effect of star f…
Simulation of Phobos gravity field estimation from Tianwen-1 flybys and implications for the modelling of Phobos' internal structure
Liu, L.; Chen, Y. H.; Guo, X. +4 more
Doppler radio tracking data from Tianwen-1, China's first Mars mission, could contribute to a better estimate of the gravity field of Phobos. In this study, we show that a determination up to degree and order 3 is feasible by considering five additional flybys of Phobos by the Tianwen-1 spacecraft, in addition to the previous flybys already done b…
The "Canonical" White Dwarf Cooling Sequence of M5
Cadelano, Mario; Pallanca, Cristina; Salaris, Maurizio +5 more
Recently, slowly cooling white dwarfs (WDs) are a new class of WD that have been identified in two globular clusters (namely M13 and NGC 6752), showing a horizontal branch (HB) morphology with an extended blue tail. The cooling rate of these WDs is reduced by stable thermonuclear hydrogen burning in their residual envelope, and they are thought to…
Discovery of periodic hot subdwarf variables through a systematic search in Zwicky Transient Facility data
Kupfer, Thomas; Barlow, Brad N.; Wang, Kevin
We conduct a systematic search for periodic variables in the hot subdwarf catalogue using data from the Zwicky Transient Facility. We present the classification of 67 HW Vir binaries, 496 reflection effect, pulsation or rotation sinusoids, 11 eclipsing signals, and 4 ellipsoidally modulated binaries. Of these, 486 are new discoveries that have not…
Effective Temperature and the Light Curve Solution of Contact Binary Systems
Filipović, M. D.; Tothill, N. F. H.; Wadhwa, S. +1 more
With an increasing number of contact binary discoveries and the recognition that luminous red novae are the result of contact binary merger events, there has been a significant increase in the number of light curve solutions appearing in the literature. One key element of such solutions is assigning and fixing the effective temperature of the prim…
Phase locking among Saturn radio emissions revealed by Cassini observations
Xu, Yan; Fischer, Georg; Yao, Zhonghua +7 more
Context. Rotational modulation has been observed in different magnetospheric phenomena at Saturn, including radio emissions, which reflect the fundamental plasma processes in key regions. Though previous studies have shown Saturn's kilometric radiation, 5 kHz narrowband emissions, and auroral hiss to be rotationally modulated, the modulation featu…
Spectral Energy Distributions of Southern Binary X-Ray Sources
Tomsick, John A.; Vrtilek, S. D.; Dickey, John M. +5 more
The rapid variability of X-ray binaries (XRBs) produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to study a sample of sources large enough to include all types in their various states, and to cover the full range of frequencies that show flux density variations. Si…
A trio of month-long flares in the nova-like variable V704 And
Pringle, J. E.; Naylor, T.; Page, K. L. +2 more
We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF for the nova-like variable V704 And, we discovered a trio of brightening events that occurred during the high state. These events elevate the optical brightness of the source from ∼13.5 to ∼12.5 mag. The events last for …