Free access
Astron. Astrophys. Suppl. Ser.
Volume 130, Number 2, June_I 1998
Page(s) 215 - 222
DOI: 10.1051/aas:1998226

Astron. Astrophys. Suppl. Ser. 130, 215-222

Effective temperatures of Ap stars

N.A. Sokolov 1,2

Send offprint request: N.A. Sokolov (first address)

1 - Central Astronomical Observatory at Pulkovo, St. Petersburg 196140, Russia
2 - St. Petersburg State University, St. Petersburg, Russia

Received September 9; accepted December 3, 1997


A new method of determination of the effective temperatures of Ap stars is proposed. The method is based on the fact that the slopes of the energy distribution in the Balmer continuum near the Balmer jump for "normal" main sequence stars and chemically peculiar stars with the same $T_\mathrm{eff}$ are identical. The effective temperature calibration is based on a sample of main sequence stars with well known temperatures (Sokolov 1995). It is shown that the effective temperatures of Ap stars are derived by this method in good agreement with those derived by the infrared flux method and by the method of Stepien & Dominiczak (1989). On the other hand, the comparison of obtained $T_\mathrm{eff}$ with $T_\mathrm{eff}$ derived from the color index (B2-G) of Geneva photometry shows a large scatter of the points, nevertheless there are no systematical differences between two sets of the data.

Key words: stars: chemically peculiar -- stars: fundamental parameters

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.