ELFT HÍRADÓ

[uhlar AT konkoly.hu (Karola_Uhlar)]

INVITATION

to the Konkoly Observatory Seminar on 7th April, 2011. 14h, on:

Information Bulletin on Variable Stars No. 6000
(1961-2011)

1121 Budapest, Konkoly Thege M. út 15-17, Lecture Hall


1. Opening address:  Béla Szeidl (10 min)

2. On the long-term variability of the B[e] supergiant Hen-S22 over
the half-century life time of IBVS: Christiaan Sterken, Vrije 
Universiteit, Brussels (45 min)

Abstract: I present  a discussion of new and archived photometry of
the LMC B[e]
supergiant Henize-S22, covering a time base that roughly corresponds to 
the lifespan of IBVS.

The main conclusion of this study is that the object is slowly brightening
and reddening, a typical signature of an LBV S Doradus phase. But also 
that significant systematic differences between all involved systems of
photometric measurement hamper the interpretation of the color behaviour,
and that voluminous modern data catalogues  can be systematically off by 
0.1 to 0.2 magnitudes in V. This example also underlines the necessity to 
maintain the possibilities  of publishing variable-star data - whatever 
the number of measurements - in an open-access peer-reviewed journal.

3. Editorial experience Katalin Oláh (15 min)

4. Electronic IBVS technology - innovation: past, future: András Holl (15 
min)

5. Reminiscence of 1961: László Szabados (15 min)

Open discussion