J/A+AS/134/489 Be stars in MC young clusters (Keller+ 1999)
Be stars in and around young clusters in the Magellanic Clouds
Keller S.C., Wood P.R., Bessell M.S.
<Astron. Astrophys. Suppl. Ser. 134, 489 (1999)>
=1999A&AS..134..489K 1999A&AS..134..489K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Be ; Magellanic Clouds ; Photometry ; Clusters, open
Keywords: stars: emission-line - stars: Be - galaxies: clusters -
galaxies: Magellanic Clouds
Abstract:
We present the results of a search for Be stars in six fields centered
on the young clusters NGC 330 and NGC 346 in the SMC, and NGC 1818,
NGC 1948, NGC 2004 and NGC 2100 in the LMC. Be stars were identified
by differencing R band and narrow-band Hα CCD images. Our
comparatively large images provide substantial Be star populations
both within the clusters and in their surrounding fields. Magnitudes,
positions and finding charts are given for the 224 Be stars found. The
fraction of Be stars to normal B stars within each cluster is found to
vary significantly although the average ratio is similar to the
average Be to B star ratio found in the Galaxy. In some clusters, the
Be star population is weighted to magnitudes near the main sequence
turn-off. The Be stars are redder in V-I than normal main-sequence
stars of similar magnitude and the redness increases with increasing
Hα emission strength.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ngc1818.dat 69 40 Hα emission stars near NGC 1818
ngc1948.dat 62 27 Hα emission stars near NGC 1948
ngc2004.dat 62 67 Hα emission stars near NGC 2004
ngc2100.dat 70 60 Hα emission stars near NGC 2100
ngc330.dat 74 76 Hα emission stars near NGC 330
ngc346.dat 66 48 Hα emission stars near NGC 346
tables.ps 72 863 PostScript version of the tables
tables.tex 164 344 LaTeX version of the tables
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See also:
J/AJ/108/932 : Variable stars in the SMC cluster NGC 330 (Sebo+, 1994)
J/A+A/317/448 : BVRHalpha photometry of NGC 1818 (Grebel 1997)
Byte-by-byte Description of file: ngc*.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name IAU designation (starting by the cluster name)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 30 F4.1 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 40 I2 arcsec DEs Declination (J2000)
42- 46 F5.2 mag Vmag V magnitude
48- 52 F5.2 mag V-I V-I colour index
54- 57 F4.2 mag R-Ha R-Hα colour index
59- 78 A20 --- Names Other names (1)
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Note (1): Other designations;
A/B/C/D refer to Robertson, 1974A&AS...15..261R 1974A&AS...15..261R
Bal to Balona, 1992MNRAS.256..425B 1992MNRAS.256..425B
sw to Sebo and Wood, 1994, Cat. J/AJ/108/932
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Acknowledgements: Stephan Keller
History:
* 17-Mar-1999: In table "ngc2100.dat", star #428, mis-identification
is C24 instead of B24.
(End) Patricia Bauer [CDS] 06-Nov-1998