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8 papers · 2 filters
WeBo 1: A Young Barium Star Surrounded by a Ring-Like Planetary Nebula
Howard E. Bond, Don L. Pollacco, Ronald F. Webbink
WeBo 1 (PN G135.6+01.0), a previously unrecognized planetary nebula with a remarkable thin-ring morphology, was discovered serendipitously on Digitized Sky Survey images. The centr…
On Why Disks Generate Magnetic Towers and Collimate Jets
D Lynden-Bell
We show that accretion disks with magnetic fields in them ought to make jets provided that their electrical conductivity prevents slippage and there is an ambient pressure in their…
Chemical composition of B-type supergiants in the OB8, OB10, OB48, OB78 associations of M31
C. Trundle, P. L. Dufton, D. J. Lennon +2
Absolute and differential chemical abundances are presented for the largest group of massive stars in M31 studied to date. These results were derived from intermediate resolution s…
More nitrogen rich B-type stars in the SMC cluster, NGC 330
D. J. Lennon, P. L. Dufton, C. Crowley
High resolution spectra of seven early B-type giant/supergiant stars in the SMC cluster NGC330 are analysed to obtain their chemical compositions relative to SMC field and Galactic…
The evolutionary status of Sher25 - implications for blue supergiants and the progenitor of SN1987A
S. J. Smartt, D. J. Lennon, R. P. Kudritzki +3
The blue supergiant Sher25 in the massive Galactic cluster NGC3603 is surrounded by a striking emission line nebula. The nebula contains an equatorial ring and probable bi-polar ou…
Optical spectroscopy of the M15 intermediate velocity cloud
J. V. Smoker, F. P. Keenan, N. Lehner +1
We present echelle spectrograph observations in NaD, at resolutions of 6.2-8.5 km/s, for 11 stars located in the line-of-sight to the M15 intermediate velocity cloud, which has a r…