Search Publications
An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy
Gu, Shenghong; Xu, Fukun; Ioannidis, Panogiotis
We present an analysis of the starspot properties and chromospheric activity on HD 134319 using high-precision photometry by Transiting Exoplanet Survey Satellite (TESS) in sectors 14-16 (T1) and 21-23 (T2) and high-resolution spectroscopy by the ELODIE spectrograph on 1.93-m telescope of Observatoire de Haute-Provence (OHP/ELODIE) and the High Re…
Stringent limits on 28SiO maser emission from the recurrent nova T Coronae Borealis
Munari, U.; Evans, A.; Pimpanuwat, B. +5 more
There are indications that the third-known eruption of the recurrent nova T CrB is imminent, and multiwavelength observations prior to the eruption are important to characterize the system before it erupts. T CrB is known to display the SiO fundamental vibrational feature at 8 $\, \mu$m. When the anticipated eruption occurs, it is possible that th…
The mass profile of NGC 3377 from a Bayesian approach
Caso, Juan P.
The mass profile for the moderately bright elliptical NGC 3377 is studied through a spherical Jeans analysis, combined with a Bayesian approach. The prior distributions are generated from dark matter simulations and observational constraints. The observational data set consist of Gemini/Gemini Multi-Object Spectrograph long-slit observations align…
BFS 10: a nascent bipolar H II region in a filamentary molecular cloud
Kerton, C. R.; Larose, Nicholas
We present a study of the compact blister H II region BFS 10 and its highly filamentary molecular cloud. We utilize 12CO observations from the Five College Radio Astronomy Observatory to determine the distance, size, mass, and velocity structure of the molecular cloud. Infrared observations obtained from the UKIRT Infrared Deep Sky Surv…
A new estimate of galaxy mass-to-light ratios from flexion lensing statistics
Fabritius, Joseph M.; Goldberg, David M.
We perform a flexion-based weak gravitational analysis of the first two Hubble Frontier Field clusters: Abell 2744 and MACS 0416. A parametric method for using radially projected flexion signals as a probe of cluster member mass is described in detail. The normalization and slope of a L - θE (as a proxy for L - σ) scaling relation in ea…
The kinematics and ionization structure of the extended emission-line region of QSO E1821+643
Robinson, A.; Seelig, T.; Rosborough, Sara A.
The most luminous quasars are created by major, gas-rich mergers and E1821+643, an optically luminous quasar situated at the centre of a cool-core cluster, appears to be in the late stages of the post-merger blowout phase. This quasar is also identified as a gravitational recoil candidate, in which the supermassive black hole (SMBH) has received a…
WHTZ 1: a high excitation Planetary Nebula not a gaseous cocoon from runaway star HD 185806
Parker, Quentin A.; Ritter, Andreas; Garde, Olivier +6 more
We present evidence that the nebular cocoon and bow-shock emission nebula putatively and recently reported as deriving from the 9th magnitude 'runaway' star HD 185806 is the previously discovered but obscure Planetary Nebula WHTZ 1 (Ra 7). It has a Gaia DR3 G~16 blue ionizing star at its geometric centre. We present imagery, spectroscopy, other da…
Role of the companion lensing galaxy in the CLASS gravitational lens B1152+199
Zhang, L.; Zhang, M.; Yuan, Q. +1 more
We reinvestigate the Cosmic Lens All-Sky Survey (CLASS) gravitational lens B1152+199 using archived Hubble Space Telescope (HST) data and Very Long Baseline Interferometry (VLBI) data. A consistent luminosity ratio within effective radius between the host galaxy and the X-galaxy is measured from HST tri-band images, which leads to a mass ratio bet…
OGLE-BLG504.12.201843: a possible extreme dwarf nova
Strader, Jay; Udalski, Andrzej; Prieto, Jose L. +5 more
We present the analysis of existing optical photometry and new optical spectroscopy of the candidate cataclysmic variable star OGLE-BLG504.12.201843. As was shown previously, this object has an orbital period of 0.523419 d and exhibits year-long outbursts with a mean period of 973 d. Using digitized photographic archives, we show that the earliest…
Characterization of the eclipsing post-common-envelope binary TIC 60040774
Knigge, C.; Scaringi, S.; Buckley, D. A. H. +2 more
Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a relatively short orbital period. Here, we present the characterization of an eclipsing post-common-enve…