J/A+A/375/366 Carbon stars from the Hamburg/ESO survey (Christlieb+ 2001)
The stellar content of the Hamburg/ESO survey.
II. A large, homogeneously-selected sample of high latitude carbon stars.
Christlieb NN., Green P.J., Wisotzki L., Reimers D.
<Astron. Astrophys. 375, 366 (2001)>
=2001A&A...375..366C 2001A&A...375..366C
ADC_Keywords: Stars, carbon ; Positional data ; Photometry, UBV ;
Equivalent widths
Keywords: stars: carbon - surveys - Galaxy: halo
Description:
This catalog contains 403 Faint High Latitude Carbon (FHLC) stars
selected from the digitized objective prism plates of the Hamburg/ESO
Survey (HES). Because of the ∼15Å 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. 329 plates (87% of the survey) were
examined, covering 6400deg2 to a magnitude limit of V∼16.5.
The catalog lists coordinates, photometry, and carbon band indices for
403 FHLC stars found in the Hamburg/ESO survey. BJ magnitudes are
accurate to better than ±0.2mag, including zero point errors. V
magnitudes, B-V and U-B colors were derived by the procedure described
in Christlieb et al. (2001A&A...366..898C 2001A&A...366..898C). We also list an object
classification for the sources, where "stars", "bright" and "ext"
refer to point sources, sources above a saturation threshold, and
sources detected as extended in DSS I images, respectively. We do not
list V, B-V and U-B for saturated objects, because our color
calibrations are not valid for them. Finally, we list two selection
flags.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanitions
--------------------------------------------------------------------------------
ReadMe 80 . This file
hesfhlcs.dat 120 403 Faint High Latitude Carbon (FHLC) stars (Table A1)
--------------------------------------------------------------------------------
See also:
J/A+A/363/1040 : DB white dwarfs from Hamburg/ESO survey (Friedrich+, 2000)
J/A+AS/115/235 : The Hamburg/ESO survey for bright QSOs. II. (Reimers+, 1996)
J/A+A/358/77 : Hamburg/ESO survey for bright QSOs. III. (Wisotzki+, 2000)
Byte-by-byte Description of file: hesfhlcs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- HE HE designation
14- 15 I2 h RAh Right ascension at equinox J2000.0,
derived from DSS I
17- 18 I2 min RAm Right ascension at equinox J2000.0
20- 23 F4.1 s RAs Right ascension at equinox J2000.0
25- 25 A1 --- DE- Declination sign at equinox J2000.0,
derived from DSS I
26- 27 I2 deg DEd Declination at equinox J2000.0
29- 30 I2 arcmin DEm Declination at equinox J2000.0
32- 33 I2 arcsec DEs Declination at equinox J2000.0
37- 39 I3 --- Field ESO-SERC field number
42- 45 I4 --- Plate HES plate number
47 A1 --- q [abcd] Plate quarter
49- 54 A6 --- Type Object type (stars/bright/ext) (1)
56- 59 F4.1 mag BJmag ? BJ magnitude
61- 64 F4.1 mag Vmag ? V magnitude
67- 70 F4.2 mag B-V ? B-V colour index, derived from HES spectra
73- 76 F4.2 mag U-B ? U-B colour index, derived from HES spectra
79- 83 F5.1 0.1nm C25165 Band index of C2 5165Å
86- 90 F5.1 0.1nm C24737 Band index of C2 4737Å
92- 99 F8.2 0.1nm CN4216 Band index of CN 4216Å
101-106 F6.2 0.1nm CN3883 Band index of CN 3883Å
113 I1 --- n_C2 [0/1] C2 band index selection flag (2)
120 I1 --- n_CN [0/1] CN band index selection flag (2)
--------------------------------------------------------------------------------
Note (1): Object types:
"stars" refers to point sources
"bright" refers to sources above a saturation threshold
"ext" refers to sources detected as extended in DSS I images
Note (2): Stars are selected if both of their C2 indices or both of their
CN indices fall into the indicated ranges.
--------------------------------------
Feature Index range Å
--------------------------------------
C2 5165Å [10, 91]
C2 4737Å [15, 114]
CN 4216Å [ 2, 56]
CN 3883Å [13, 55]
--------------------------------------
--------------------------------------------------------------------------------
Acknowledgements: Norbert Christlieb,
(End) Patricia Bauer [CDS] 15-Aug-2001