EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 375/2 Article
Free access article

Issue A&A
Volume 375, Number 2, August IV 2001
Page(s) 366 - 374
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20010814



A&A 375, 366-374 (2001)
DOI: 10.1051/0004-6361:20010814

The stellar content of the Hamburg/ESO survey

II. A large, homogeneously-selected sample of high latitude carbon stars
N. Christlieb1, P. J. Green2, L. Wisotzki3 and D. Reimers1

1  Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
    e-mail: dreimers@hs.uni-hamburg.de
2  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02140, USA
    e-mail: pgreen@cfa.harvard.edu
3  Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
    e-mail: lutz@astro.physik.uni-potsdam.de

(Received 26 April 2001 / Accepted 5 June 2001 )

Abstract
We present a sample of 403 faint high latitude carbon (FHLC) stars selected from the digitized objective prism plates of the Hamburg/ESO Survey (HES). Because of the $\sim $15 Å spectral resolution and high signal-to-noise ratio of the HES prism spectra, our automated procedure based on the detection of C2 and CN molecular bands permits high-confidence identification of carbon stars without the need for follow-up spectroscopy. From a set of 329 plates (87 % of the survey), covering 6 400 deg2 to a magnitude limit of $V\sim16.5$, we analyze the selection efficiency and effective surface area of the HES FHLC survey to date. The surface density of FHLC stars that we detect ( $0.072\pm 0.005$ deg-2) is 2-4 times higher than that of previous objective prism and CCD surveys at high galactic latitude, even though those surveys claimed a limiting magnitude up to 1.5 magnitudes fainter. This attests to the highest selection sensitivity yet achieved for these types of stars.


Key words: stars: carbon -- surveys -- Galaxy: halo

Offprint request: N. Christlieb, nchristlieb@hs.uni-hamburg.de

SIMBAD Objects
Tables at the CDS



© 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.