Free access
Astron. Astrophys. Suppl. Ser.
Volume 144, Number 2, June I 2000
Page(s) 285 - 306
DOI: 10.1051/aas:2000343

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 $(V-L)_{\rm obs}$ and the colour excess E(V-L) due to the contribution of a circumstellar dust shell. Polarimetric data were also compared with the value of $v\sin{i}$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 ($\approx$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

SIMBAD Objects

Copyright The European Southern Observatory (ESO)

What is OpenURL?

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 EDPS Account.
    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.