5 papers
Hipparcos period-luminosity relations for Miras and semiregular variables
T. R. Bedding, A. A. Zijlstra
We present period-luminosity diagrams for nearby Miras and semiregulars, selecting stars with parallaxes better than 20 per cent and well-determined periods. Using K-band magnitude…
ATOMIUM: Continuum emission and evidence of dust enhancement from binary motion
T. Danilovich, N. Samaratunge, Y. Mori +35
Low- and intermediate-mass stars on the asymptotic giant branch (AGB) account for a significant portion of the dust and chemical enrichment in their host galaxy. Here we present AL…
The secular evolution of planetary nebula IC 418 and its implications for carbon star formation
Albert A. Zijlstra, Quentin A. Parker
The rate of stellar evolution can rarely be measured in real time. The fastest evolution (excluding event-driven evolution), where stars may evolve measurably over decades, is duri…
FAST search for circumstellar atomic hydrogen. III. Planetary nebulae at Galactic latitudes |b|>10degree
Xu-Jia Ouyang, Yong Zhang, Albert Zijlstra +4
The detection of circumstellar atomic hydrogen (\ion{H}{1}) via the 21\,cm line remains a persistent challenge in planetary nebula (PN) studies, primarily due to contamination from…
The Structure of the Molecular Envelope of the Ring Nebula (NGC 6720)
Joel H. Kastner, David Wilner, Diana Ryder +5
We present the first interferometric imaging of molecular line emission from the Ring Nebula, NGC~6720, in the form of Submillimeter Array (SMA) observations of CO $J=2\rightarrow…