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19 April 2024 |
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The stellar content of the Hamburg/ESO survey. II. A large, homogeneously-selected sample of high latitude carbon stars | | N. Christlieb
; P.J. Green
; L. Wisotzki
; D. Reimers
; | | Date: |
13 Jun 2001 | | Subject: | astro-ph | | Affiliation: | Hamburger Sternwarte, Universitaet Hamburg, Germany), P.J. Green (Harvard-Smithsonian Center for Astrophysics, USA), L. Wisotzki (Institut fuer Physik, Universitaet Potsdam, Germany), D. Reimers (Hamburger Sternwarte, Universtaet Hamburg, Germany | | 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 ~15 Angstroem spectral resolution and high signal-to-noise ratio of the HES prism spectra, our automated procedure based on the detection of C_2 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 6400 square degrees to a magnitude limit of V~16.5, 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 +/- 0.005 square degrees) 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. | | Source: | arXiv, astro-ph/0106240 | | Services: | Forum | Review | PDF | Favorites | |
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