Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Frew, David J"'
Autor:
Barker, Helen, Zijlstra, Albert, De Marco, Orsola, Frew, David J., Drew, J. E., Corradi, R. L. M., Eislöffel, Jochen, Parker, Quentin A.
Publikováno v:
MNRAS 475, 4504-4523 (2018)
The majority of planetary nebulae (PNe) are not spherical, and current single-star models cannot adequately explain all the morphologies we observe. This has led to the Binary Hypothesis, which states that PNe are preferentially formed by binary syst
Externí odkaz:
http://arxiv.org/abs/1712.03194
Autor:
Frew, David J.
Determining the demographics of the Galactic planetary nebula (PN) population is an important goal to further our understanding of this intriguing phase of stellar evolution. The Galactic population has more than doubled in number over the last 15 ye
Externí odkaz:
http://arxiv.org/abs/1612.02147
Autor:
Hillwig, Todd C., Frew, David J., Reindl, Nicole, Rotter, Hannah, Webb, Andrew, Margheim, Steve
We find the central stars of the planetary nebulae (PNe) HaTr 7 and ESO 330-9 to be close binary systems. Both have orbital periods of less than half a day and contain an irradiated cool companion to the hot central star. We provide light curves, spe
Externí odkaz:
http://arxiv.org/abs/1612.01420
By incorporating our major recent discoveries with re-measured and verified contents of existing catalogues we provide, for the first time, an accessible, reliable, on-line SQL database for essential, up-to date information for all known Galactic PNe
Externí odkaz:
http://arxiv.org/abs/1603.07042
The H$\alpha$ surface brightness $-$ radius ($S-r$) relation is a robust distance indicator for planetary nebulae (PNe), further enhanced by different populations of PNe having distinct loci in $S-r$ space. Other types of photoionized nebulae also pl
Externí odkaz:
http://arxiv.org/abs/1603.00983
Autor:
Parker, Quentin A., Zijlstra, Albert A., Stupar, Milorad, Cluver, Michelle, Frew, David J., Bendo, George, Bojicic, Ivan
We report the discovery of the closest collisional ring galaxy to the Milky Way. Such rare systems occur due to "bulls-eye" encounters between two reasonably matched galaxies. The recessional velocity of about 840 km/s is low enough that it was detec
Externí odkaz:
http://arxiv.org/abs/1508.03620
Autor:
Hillwig, Todd C., Frew, David J., Louie, Melissa, De Marco, Orsola, Bond, Howard E., Jones, David, Schaub, S. C.
A growing number of close binary stars are being discovered among central stars of planetary nebulae. Recent and ongoing surveys are finding new systems and contributing to our knowledge of the evolution of close binary systems. The push to find more
Externí odkaz:
http://arxiv.org/abs/1505.07338
Publikováno v:
MNRAS, 455, 1459 (2016)
Measuring the distances to Galactic planetary nebulae (PNe) has been an intractable problem for many decades. We have now established a robust optical statistical distance indicator, the H$\alpha$ surface brightness- radius or S-r relation, which add
Externí odkaz:
http://arxiv.org/abs/1504.01534
We present an alternative interpretation for the putative symbiotic star DT Serpentis, and its proposed planetary nebula (PN), recently announced by Munari et al. Our analysis is based on their data combined with additional archival data trawled from
Externí odkaz:
http://arxiv.org/abs/1403.7847
We have commenced a detailed analysis of the known sample of Galactic post-asymptotic giant branch (PAGB) objects compiled in the Toru\'n catalogue of Szczerba et al., and present, for the first time, homogeneously derived distance determinations for
Externí odkaz:
http://arxiv.org/abs/1403.7230