EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 373/1 Article
Free access article

Issue A&A
Volume 373, Number 1, July I 2001
Page(s) 56 - 62
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010598



A&A 373, 56-62 (2001)
DOI: 10.1051/0004-6361:20010598

The oxygen abundance distribution in M 101

L. S. Pilyugin

Main Astronomical Observatory of National Academy of Sciences of Ukraine, Goloseevo, 03680 Kiev-127, Ukraine

(Received 15 March 2001 / Accepted 23 April 2001 )

Abstract
The well-observed spiral galaxy M 101 was considered. The radial distributions of oxygen abundances determined in three different ways (with the classic $T_{\rm e}$-method, with the R23-method, and with the P-method) were compared. It was found that the parameters (the central oxygen abundance and the gradient) of the radial (O/H)P abundance distribution are close to those of the (O/H) $_{T_{\rm e}}$ abundance distribution. The parameters of the (O/H)R23 abundance distribution differ significantly from those of the (O/H) $_{T_{\rm e}}$ abundance distribution: the central (O/H)R23 oxygen abundance is higher by around 0.4 dex and the gradient is steeper by a factor of around 1.5 as compared to those values in the (O/H) $_{T_{\rm e}}$ abundance distribution. The dispersion in (O/H)P abundance at fixed radius is rather small, ~0.08 dex, and is equal to that in (O/H) $_{T_{\rm e}}$ abundance. The dispersion in (O/H)R23 abundance at fixed radius is appreciably larger, ~0.16 dex, compared to that in (O/H) $_{T_{\rm e}}$ abundance. It has been shown that the extra dispersion in (O/H)R23 abundances is an artifact and reflects scatter in excitation parameter P at fixed radius.


Key words: galaxies: abundances -- galaxies: ISM -- galaxies: spiral -- galaxies: individual: M 101

Offprint request: L. S. Pilyugin, pilyugin@mao.kiev.ua

SIMBAD Objects



© ESO 2001


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 http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.