Volume 423, Number 1, August III 2004
|Page(s)||L1 - L4|
|Published online||29 July 2004|
Letter to the Editor
η Carinae: The 1998 brightening and the smearing-out effect
Leiden Observatory, Postbus 9513, 2300RA Leiden, The Netherlands e-mail: firstname.lastname@example.org
2 Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
Accepted: 11 June 2004
A comparison of broad-band photometry of the Homunculus (ground-based data) and of broad-band and narrow-band photometry of the central region (HST-based) from 1997 to 2003 reveals that, apart from the brightening in 1998, the Homunculus as well as the central star varied in a very similar way. This excludes smearing-out effects as an explanation for the difference between the brightening of the central region and that of the Homunculus during 1998. A plausible reason for the homologous light behaviour is enhanced extinction decrease in the line-of-sight to the central region during a global brightening occurring after the 1998.0 spectroscopic event. From 1998 to 2004 there is indeed a brightness excess of ~03 between the Homunculus and the extrapolated secular brightening. We also illustrate that ground-based aperture photometry of the Homunculus is a reliable diagnostic tool for studying the variability of the central star.
Key words: technique: photometric - stars: individual: η Carinae - variables - supergiants
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.