Reference: ING Newsl., No. 9, page 32.
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Conference: Second Meeting on Hot Subdwarf Stars and Related Objects
Together with the Nordic Optical
Telescope, the ING is organising a meeting with the title “Hot Subdwarf Stars
and Related Objects”, to be held on La Palma from the 6 to 10 of June this
summer. The conference venue is the Real Club Náutico of Santa Cruz
de La Palma, and it will be the first major astronomy conference to be held
in the home town of the ING’s sea-level offices.
Financial support has been given by the organisers, the Excmo. Cabildo Insular
de La Palma (local government) and the Patronato de Turismo de La Palma (tourist
board). Additionally the Real Club Náutico has been extremely helpful
by making their facilities available to us at no cost.
This conference is the second meeting on hot subdwarf stars, a new biennial
series that was started at Keele University in 2003. It is an offspring of
the long running White Dwarf meetings, which counted their 14th meeting last
year. The intention is that the Subdwarf meetings will also run every second
year, in the odd years between the WD meetings. The aim of the workshop series
is to disseminate recent results on the properties, formation, and evolution
of the hot subdwarf stars and related objects, and to assess the impact of
these results on other areas of astrophysics.
Hot subdwarf stars are extreme horizontal branch (EHB) stars and pre-white
dwarf stars. The EHB stars are core helium-burning stars with extremely thin
hydrogen envelopes, and form the majority of bright stars in surveys for extremely
blue objects, where they are classified as subdwarf-B (sdB) stars. They also
appear in the colour-magnitude diagrams of some globular clusters as an extension
of the blue tail formed by classical horizontal branch stars, though it is
not clear why some clusters show this feature and others do not. The pre-white
dwarf stars are related to the sdBs, but have exhausted their capacity to
burn helium in the core. Many of the brightest hot subdwarfs in the field
are of this class, and they are classified as sdO stars.
Topics for the meeting includes: Evolutionary models and the UV-upturn phenomenon;
hot subdwarfs and hot HB stars in the field, clusters and galaxies; hot subdwarfs
in binary systems; atmospheric properties of hot subdwarf stars; asteroseismology
of sdB stars, and progenitors and progeny of sdB stars.
The capacity of the conferences is limited by the size of the available
facilities to about 90 people. More information can be found on the ING web-pages,
The registration is open until April 1. ¤
*: Email contact:
Roy H. Østensen on behalf of the Local Organising