Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Woolf, V M"'
Autor:
Dorsch, M., Jeffery, C. S., Monai, A. Philip, Tout, C. A., Snowdon, E. J., Monageng, I., Scott, L. J. A., Miszalski, B., Woolf, V. M.
Magnetic fields with strengths ranging from 300 to 500 kG have recently been discovered in a group of four extremely similar helium-enriched hot subdwarf (He-sdO) stars. Besides their strong magnetic fields, these He-sdO stars are characterised by co
Externí odkaz:
http://arxiv.org/abs/2410.02737
BPS CS 22940-0009 is a helium-rich B-star that shares characteristics with both helium-rich B subdwarfs and extreme helium stars. The optical spectrum of BPS CS 22940-0009 has been analysed from SALT observations. The atmospheric parameters were foun
Externí odkaz:
http://arxiv.org/abs/2208.07720
The discovery of extremely zirconium- and lead-rich surfaces amongst a small subgroup of hot subdwarfs has provoked questions pertaining to chemical peculiarity in hot star atmospheres and about their evolutionary origin. With only three known in 201
Externí odkaz:
http://arxiv.org/abs/1910.08947
The majority of hot subdwarf stars are low-mass core-helium-burning stars. Their atmospheres are generally helium deficient; however a minority have extremely helium-rich surfaces. An additional fraction have an intermediate surface-helium abundance,
Externí odkaz:
http://arxiv.org/abs/1701.03026
Akademický článek
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Autor:
Jeffery, C. S., Baran, A. S., Behara, N. T., Kvammen, A., Martin, P., N., Naslim, Østensen, R. H., Preece, H. P., Reed, M. D., Telting, J. H., Woolf, V. M.
UVO0825+15 is a hot bright helium-rich subdwarf which lies in {\it K2} Field 5 and in a sample of intermediate helium-rich subdwarfs observed with {\it Subaru/HDS}. The {\it K2} light curve shows low-amplitude variations, whilst the {\it Subaru} spec
Externí odkaz:
http://arxiv.org/abs/1611.01616
Subluminous B stars come in a variety of flavours including single stars, close and wide binaries, and pulsating and non-pulsating variables. A majority have helium-poor surfaces (helium by number nHe<1%), whilst a minority have extremely helium-rich
Externí odkaz:
http://arxiv.org/abs/1204.4387
Publikováno v:
Monthly Notices of the Royal Astronomical Society; May2024, Vol. 530 Issue 2, p1666-1678, 13p
Autor:
O'Toole, S. J., Heber, U., Jeffery, C. S., Dreizler, S., Schuh, S. L., Woolf, V. M., Falter, S., Green, E. M., For, B. -Q., Hyde, E. A., Kjeldsen, H., Mauch, T., White, B. A.
We present results and analysis for the 2m spectroscopic part of the MultiSite Spectroscopic Telescope (MSST) campaign undertaken in May/June 2002. The goal of the project was to observe the pulsating subdwarf B star PG1605+072 simultaneously in velo
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506722
Publikováno v:
Astrophys.J. 617 (2004) 1091-1114
From newly-obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3<[Fe/H]<+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0410396