Astron. Astrophys. Suppl. Ser. 144, 285-306
Analysis of correlations between polarimetric and photometric
characteristics of young stars
A new approach to the problem after eleven years' study
Central Astronomical Observatory of the Russian
Academy of Sciences at Pulkovo, 196140 Saint-Petersburg, Russia
Received March 12, 1999; accepted March 14, 2000
We present the results of the investigation of correlations between the
polarimetric and photometric characteristics of a sample (496 objects) of
young Herbig Ae/Be (HAEBE) stars and T Tauri (TT) stars. It is shown that,
for 85% of the sample stars there is a general relation between the degree
of optical polarization and the infrared colour index
the colour excess E
) due to the contribution of a circumstellar
dust shell. Polarimetric data were also compared with the value of
to search for a possible correlation between the polarization and an
inclination of circumstellar disks. Polarimetric data as well as IR excesses
are considered and compared for different subgroups of young stars namely:
HAEBE and TT stars with Algol-like minima of brightness (26 objects),
Vega-type stars and post HAEBE stars (114 objects) and young solar-type stars
(58 objects). For statistical purposes the data for young stars were compared
with those collected for different groups of evolved objects such as: classical
Be stars (
300 objects), Mira Ceti stars (39 objects), early-type
supergiants from the Serkowski et al. catalogue (120 objects)
and main sequence (MS) stars within 50 pc from the Sun from the Leroy catalogue (68 objects). The value of polarization is discussed
in context with the stages of evolution of circumstellar shells which were
established by comparison of spectral energy distribution in the far IR
(using the IRAS data). It is shown that most young stars have statistically
larger value of polarization in comparison with the stars which are on a
stage of evolution close to MS. We are able to contend that the
changes in polarimetric behaviour of young stars are connected with evolution
of their circumstellar shells.
Key words: polarization -- circumstellar matter --
stars: evolution -- star: pre-mains sequence
Copyright The European Southern Observatory (ESO)
The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.
An OpenURL link contains article metadata and directs it to the
OpenURL server of your choice. The OpenURL server can provide access
to the resource and also offer complementary services (specific
search engine, export of references...). The OpenURL link can be
generated by different means.
If your librarian has set up your subscription with an
OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your
In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see
You should disable this module if you wish to use the OpenURL server that you or your library have defined.