Publications (11)
Spectral evolution of the narrow emission line components in optical during the 2022 nova eruption of U Scorpii
Katsuki Muraoka, Naoto Kojiguchi, Junpei Ito +20
There remains debate over whether the accretion disk survives or is entirely disrupted after the nova eruption. In our previous paper, Muraoka et al. (2024, PASJ, 76, 293) have pho…
NuSTAR Detection of X-rays Concurrent with Gamma Rays in the Nova V5855 Sgr
Thomas Nelson, Koji Mukai, Kwan-Lok Li +7
We report the first detection of hard (>10 keV) X-ray emission simultaneous with gamma rays in a nova eruption. Observations of the nova V5855 Sgr carried out with the NuSTAR satel…
QZ Carinae Orbit of the Two Binary Pairs
Mark Blackford, Stan Walker, Edwin Budding +9
We present an updated O-C diagram of the light-time variations of the eclipsing binary (component B) in the system QZ Carinae as it moves in the long-period orbit around the non-ec…
An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data
Klaus Bernhard, Sebastián Otero, Stefan Hümmerich +3
We present an investigation of a large sample of confirmed (N=233) and candidate (N=54) Galactic classical Be stars (mean V magnitude range of 6.4 to 12.6 mag), with the main aim o…
A Detailed Observational Analysis of V1324 Sco, the Most Gamma-Ray Luminous Classical Nova to Date
Thomas Finzell, Laura Chomiuk, Brian D. Metzger +32
It has recently been discovered that some, if not all, classical novae emit GeV gamma rays during outburst, but the mechanisms involved in the production of the gamma rays are stil…
The variability of the BRITE-est Wolf-Rayet binary, $γ^2$ Velorum I. Photometric and spectroscopic evidence for colliding winds
Noel D. Richardson, Christopher M. P. Russell, Lucas St-Jean +26
We report on the first multi-color precision light curve of the bright Wolf-Rayet binary $γ^2$ Velorum, obtained over six months with the nanosatellites in the BRITE- Constellatio…
An Investigation of Four Chemically Peculiar Stars with Photometric Periods below 12 Hours
Stefan Hümmerich, Klaus Bernhard, Ernst Paunzen +3
We present an investigation of three chemically peculiar (CP) stars and one CP star candidate which exhibit photometric periods below 12 hours. New spectroscopic observations have…
ST Chamaeleontis and BP Coronae Australis: Two Southern Dwarf Novae Confirmed as Z Cam Stars
Mike Simonsen, Terry Bohlsen, Franz-Josef Hambsch +1
Z Camelopardalis (Z Cam) stars are a subset of dwarf novae distinguished by the occurrence of standstills, periods of relative constant brightness one to one and a half magnitudes…
From Light to Sound: Spectroscopic Evolution & Sonification of the flaring Nova V612 Scuti
Pragati Acharya, Elias Aydi, Kirill V. Sokolovsky +17
We present photometric and spectroscopic observations of the 2017 Galactic nova V612 Sct, whose optical evolution was marked by multiple unusually large maxima. The eruption includ…
The ambiguous transient ASASSN-17hx. A possible nova-impostor
Elena Mason, Steven N. Shore, Paul Kuin +1
Some transients, although classified as novae based on their maximum and early decline optical spectra, cast doubts on their true nature and whether nova impostors might exist. We…
BRITE-Constellation high-precision time-dependent photometry of the early-O-type supergiant Puppis unveils the photospheric drivers of its small- and large-scale wind structures
Tahina Ramiaramanantsoa, Anthony F. J. Moffat, Robert Harmon +33
From months of dual-band optical photometric monitoring at the mmag level, BRITE-Constellation has revealed two simultaneous types of variability in the O4I(n)fp star $ζ…