Issue |
A&A
Volume 371, Number 2, May IV 2001
|
|
---|---|---|
Page(s) | 560 - 570 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20010397 | |
Published online | 15 May 2001 |
A search for faint galactic carbon stars from the First Byurakan Spectral Sky Survey. I.*
1
378433 Byurakan Astrophysical Observatory & Isaac Newton Institute of Chile, Armenian Branch, Ashtarak d-ct, Armenia
2
Groupe d'Astrophysique, CNRS & Univ. de Montpellier, CC 072, Place Bataillon, 34095 Montpellier Cedex 5, France
3
IAM, Observatoire de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 4, France
Corresponding author: K. Gigoyan, kgigoyan@bao.sci.am
Received:
6
December
2000
Accepted:
16
February
2001
We present and analyse in this paper the first results of a systematic search
for Galactic carbon (C) stars using the First Byurakan Spectral Sky Survey
(FBS). The present surveyed area extends over ~6140 deg2 on the sky
corresponding to ~ of the complete FBS Survey. Accurate positions,
spectral classifications, approximate B and R magnitudes, and finding
charts are provided for 35 objects. Identification and spectral subclasses
(R or N) of those stars, belonging to the magnitude range
10.5 ≤
R
≤ 16.4, were determined
by scrutinizing the
Byurakan Schmidt telescope
objective-prism plates. Subsequent slit-spectroscopic
observations were
obtained by us for 21 stars, confirming the carbon nature of them all.
From this result, it is assumed that the remaining C star candidates
are most likely carbon-rich stars as well. 18 of the listed objects
at a Galactic latitude (
°) are faint enough (
) to be
considered as Faint High Latitude Carbon (FHLC) stars according to the
definition of Totten & Irwin ([CITE]). JHK magnitudes for 23 objects of
our list are provided by the 2MASS database. Approximate distances are
estimated from R and/or JHK data. Most of the stars are located between
7 and
25 kpc from the Sun while their distances
z to the Galactic plane range from about 2 to 25 kpc.
The most distant object of our
sample is found at
45 kpc and
kpc. It is interesting
to note that the rate of newly discovered FBS FHLC stars -one object per
200 deg2 -is comparable to that achieved by other previous surveys.
Consequently it is reasonable to expect that the full exploitation of the
FBS plates might result in the identification of about 45 new FHLC stars.
Key words: stars: carbon / surveys / Galaxy: halo / Galaxy: stellar content
© ESO, 2001
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