J/MNRAS/441/L36 UBVI photometry of NGC4337 (Carraro+, 2014)
NGC 4337: an overlooked old cluster in the inner disc of the Milky Way.
Carraro G., Giorgi E.E., Costa E., Vazquez R.A.
<Mon. Not. R. Astron. Soc., 441, L36-L40 (2014)>
=2014MNRAS.441L..36C 2014MNRAS.441L..36C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: open clusters and associations: general -
open clusters and associations: individual: NGC 4337
Abstract:
Galactic open clusters do not survive long in the high-density regions
of the inner Galactic disc. Inside the solar ring only 11 open
clusters are known with ages older than 1Gyr. We show here, basing on
deep, high-quality photometry, that NGC 4337, contrary to earlier
findings, is indeed an old open cluster. The cluster is located very
close to the conspicuous star cluster Trumpler 20, as well
misclassified in the past, and that has received so much attention in
recent years. NGC 4337 shows a significant clump of He-burning stars
which was not detected previously. Its beautiful colour-magnitude
diagram is strikingly similar to the one of the classical old open
clusters IC 4651, NGC 752, and NGC 3680, and this suggests similar age
and composition. A spectroscopic study is much needed to confirm our
findings. This, in turn, would also allow us to better define the
inner disc radial abundance gradient and its temporal evolution. To
this aim, a list of clump star candidates is provided.
Description:
We took UBVI images of NGC 4337 in a 20x20 squared arcmin area during
two observing runs, on 2010 Feb 14 and 2010 Mar 11, at Cerro Tololo
Inter-American Observatory, using the 0.9m and the 1.0m telescopes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 95 8197 Photometric data
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See also:
J/A+A/361/929 : IC 4651 uvby photometry (Meibom, 2000)
J/AJ/127/1000 : NGC 3680 Stromgren and Ca photometry (Anthony-Twarog+, 2004)
J/MNRAS/356/647 : NGC 6404 and 6583 VI photometry (Carraro+, 2005)
J/MNRAS/371/1301 : BVI photometry of six old open clusters (Carraro+, 2006)
J/A+A/464/573 : VI photometry of 5 open clusters (Carraro+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/8197] Sequential number
6- 12 F7.2 pix Xpos X position
14- 20 F7.2 pix Ypos Y position
22- 32 F11.7 deg RAdeg Right ascension (J2000.0)
34- 44 F11.7 deg DEdeg Declination (J2000.0)
46- 51 F6.3 mag Vmag V magnitude
53- 57 F5.3 mag e_Vmag rms uncertainty on Vmag
59- 64 F6.3 mag B-V B-V colour index
66- 70 F5.3 mag e_B-V rms uncertainty on B-V
72- 77 F6.3 mag U-B ?=9.999 U-B colour index
79- 83 F5.3 mag e_U-B ?=9.999 rms uncertainty on U-B
85- 89 F5.3 mag V-I ?=9.999 V-I colour index
91- 95 F5.3 mag e_V-I ?=9.999 rms uncertainty on V-I
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Acknowledgements:
Giovanni Carraro, gcarraro(at)eso.org
(End) Patricia Vannier [CDS] 10-Dec-2015