J/A+A/317/54 Fornax cluster 1 and 3 photometry (Jorgensen+ 1997)
Globular clusters 1 and 3 in the Fornax dwarf galaxy
Jorgensen U.G., Jimemez R.
<Astron. Astrophys. 317, 54 (1997)>
=1997A&A...317...54J 1997A&A...317...54J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, CCD
Keywords: stars: carbon - stars: AGB - galaxies: formation -
galaxies: individual: Fornax dSph (A0237-34) - galaxies: star clusters
Description:
We have performed photometric CCD observations of the giant and
horizontal branches of the globular cluster1, and of the giant branch
of cluster3, in the Fornax dwarf spheroidal galaxy. The observations
were performed in the V and I standard broad-band filters as well as
through two narrow-band filters especially designed to distinguish
between carbon and M type stars. The AGB is richly populated with
carbon-rich stars, and all of them are considerably below the
theoretical lower luminosity limit for such stars. If the Fornax
clusters are interpreted as resembling an earlier epoch of the
Galactic globular clusters, the low luminosities of the carbon stars
therefore point to a larger role of the low-mass stars in the chemical
enrichment of our Galaxy. The giant branches of the Fornax clusters
are much broader than canonical giant branches in Galactic globulars,
and the AGB is more well populated. We suggest that the morphology and
stellar population of the giant branches indicate that the dwarf
galaxies are ≃3Gyr younger than the Galactic halo, which in turn
seems to be ≃3Gyr younger than the Galactic globular clusters.
For a description of the N2-N3 photometric system, see e.g. GCPD/39
Objects:
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RA (2000) DE Designation(s)
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02 37.0 -34 11 Cluster 1 in Fornax
02 39.8 -34 16 Cluster 3 in Fornax
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 54 51 Cluster 1 photometry
table2 49 30 Cluster 3 photometry
tables.tex 79 114 LaTeX version of the tables
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Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID Identification number
4- 8 F5.2 mag Vmag V magnitude
10- 13 F4.2 mag B-V B-V color index
15- 18 F4.2 [solLum] logL Reduced luminosity
20- 23 F4.2 [K] logTeff Effective temperature
25- 29 F5.2 mag Mbol Absolute bolometric magnitude
31- 35 F5.2 mag 81-78 ? Narrow band color
{DELTA}m(81-78)=m(8120A)-m(7795A)
37- 38 I2 --- N2 ? Number in Buonanno et al. (1985) catalogue
40- 44 F5.2 mag Vmag2 ? V magnitude in Buonanno et al. (1985)
46- 48 I3 --- N3 ? Number in Demers et al. (1990) catalogue (1)
50- 54 F5.2 mag Vmag3 ? V magnitude in Demers et al. (1990) (1)
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Note (1): These data are only in table1
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Acknowledgements: Raul Jimenez
References:
Buonanno R. et al., 1985, A&A 152, 65 =1985A&A...152...65B 1985A&A...152...65B
Demers et al., 1990, PASP 102, 632 =1990PASP..102..632D 1990PASP..102..632D
(End) Patricia Bauer [CDS] 03-Jun-1996