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The magnetic, spectroscopic, and photometric variability of the Wolf-Rayet star WR 55
Hubrig, S.; Cikota, A.; Schöller, M. +2 more
Studies of magnetic fields in the most evolved massive stars, the Wolf-Rayet stars, are of special importance because they are progenitors of certain types of supernovae. The first detection of a magnetic field of the order of a few hundred gauss in the WN7 star WR 55, based on a few FORS2 low-resolution spectropolarimetric observations, was repor…
A Surprising Periodicity Detected during a Super-outburst of V844 Herculis by TESS
Thorstensen, John R.; Garnavich, Peter; Littlefield, Colin +6 more
We identify a previously undetected periodicity at a frequency of 49.08 ± 0.01 days-1 (period of 29.34 ± 0.01 minutes) during a super-outburst of V844 Her observed by TESS. V844 Her is an SU UMa type cataclysmic variable with an orbital period of 78.69 minutes, near the period minimum. The frequency of this new signal is constant in con…
An Introduction of the 3rd Realization of the International Celestial Reference Frame (ICRF3)
Zhu, Zi; Liu, Jia-cheng; Liu, Niu +1 more
The 3rd realization of the International Celestial Reference Frame, ICRF3, has been the latest ICRF (the International Celestial Reference Frame) as the replacement of its previous realization, ICRF2, since January 1, 2019. The ICRF3 is aligned to the ICRS (the International Celestial Reference System) to within the accuracy of the ICRF2. After it…
Into the Mystic: ALMA ACA observations of the Mystic Mountains in Carina
Reiter, Megan; Klaassen, P. D.; McLeod, A. F. +2 more
We present new observations of the Mystic Mountains cloud complex in the Carina Nebula using the ALMA Atacama Compact Array (ACA) to quantify the impact of strong UV radiation on the structure and kinematics of the gas. Our Band 6 observations target CO, 13CO, and C18O; we also detect DCN J=3-2 and 13CS J=5-4. A de…
Exploring the impact of imaging cadence on inferring CME kinematics
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +2 more
The kinematics of coronal mass ejections (CMEs) are crucial for understanding their initiation mechanism and predicting their impact on Earth and other planets. With most of the acceleration and deceleration occurring below 4 R⊙, capturing this phase is vital to better understand their initiation mechanism. Furthermore, the kinematics of CMEs in t…
Far-infrared line emission from the outer Galaxy cluster Gy 3-7 with SOFIA/FIFI-LS: Physical conditions and UV fields
König, C.; Menten, K. M.; Karska, A. +13 more
Context. Far-infrared (FIR) line emission provides key information about the gas cooling and heating due to shocks and UV radiation associated with the early stages of star formation. Gas cooling via FIR lines might, however, depend on metallicity.
Aims: We aim to quantify the FIR line emission and determine the spatial distribution of the CO…
The first photometric and spectroscopic analysis of the neglected totally eclipsing contact binary NSVS 2536063
Wang, Xi; Li, Kai; Xia, Qi-Qi +4 more
We firstly studied the neglected totally eclipsing contact binary NSVS 2536063 using the newly observed g'r'i' light curves of 60 cm Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) and some public data, which come from the Transiting Exoplanet Survey Satellite (TESS), the All-Sky Automated Surv…
Radio multifrequency observations of Abell 781 with the WSRT
Venturi, T.; Dallacasa, D.; Bernardi, G. +4 more
The Main galaxy cluster in the Abell 781 system is undergoing a significant merger and accretion process with peripheral emission to the north and south-eastern flanks of the merging structure. Here we present a full polarimetric study of this field, using radio interferometric data taken at 21 and 92 cm with the Westerbork Synthesis Radio Telesco…
The Advanced Spectral Library: The Evolution of Chromospheric Wind Characteristics from Noncoronal to Hybrid Giant Stars
Carpenter, Kenneth G.; Nielsen, Krister E.; Airapetian, Vladimir S. +1 more
The Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph treasury program Advanced Spectral Library enables investigations of the characteristics and dynamics of the wind and chromosphere of cool stars using high-quality spectral data. This paper shows how the wind features change with spectral class when transferring across the Linsk…
Kronberger 55: A candidate for end-dominated collapse scenario
Pandey, Rakesh; Sharma, Saurabh; Dewangan, Lokesh +5 more
Using optical photometric observations from 1.3-m Devasthal Fast Optical Telescope and deep near-infrared (NIR) photometric observations from TANSPEC mounted on 3.6-m Devasthal Optical Telescope, along with the multi-wavelength archival data, we present our study of open cluster Kronberger 55 to understand the star-formation scenario in the region…