68 citations · 637 across the 38 of their papers we have counts for
18 papers · 1 filter
Polarization position angle standard stars: a reassessment of and its variability for seventeen stars based on a decade of observations
Daniel V. Cotton, Jeremy Bailey, Lucyna Kedziora-Chudczer +14
Observations of polarization position angle () standards made from 2014 to 2023 with the High Precision Polarimetric Instrument (HIPPI) and other HIPPI-class polarimeters in bot…
Epsilon Sagittarii: An Extreme Rapid Rotator with a Decretion Disk
Jeremy Bailey, Fiona Lewis, Ian D. Howarth +3
We report high-precision multi-wavelength linear-polarization observations of the bright B9 (or A0) star Sagittarii. The polarization shows the distinctive wavelength dependenc…
Deneb is a Large Amplitude Polarimetric Variable
Daniel V. Cotton, Jeremy Bailey, Jean Perkins +2
We write to report the discovery that Deneb is a large amplitude polarization variable. Over a ~400 d time span from August 2022 Deneb's polarization was typically around 3900 part…
Rapid polarization variations in the O4 supergiant Puppis
Jeremy Bailey, Ian D. Howarth, Daniel V. Cotton +5
We present time-series linear-polarization observations of the bright O4 supergiant Puppis. The star is found to show polarization variation on timescales of around an hour and…
Near-UV and optical spectroscopic investigation of late-type stars from MIRA/Oliver Observing Station
Subhajeet Karmakar, Avrajit Bandyopadhyay, Wm. Bruce Weaver +4
Late-type stars are the most abundant in the galactic stellar population. These stars, with a similar internal structure to the Sun, are expected to have solar-like atmospheres. In…
A study of the rapid rotator Aql: differential surface rotation?
Ian D. Howarth, Jeremy Bailey, Daniel V. Cotton +1
We report new, extremely precise, photopolarimetry of the rapidly-rotating A0 main-sequence star Aql, covering the wavelength range 400--900nm, which reveals a rotational…