J/MNRAS/446/730 VIJK photometry of Whiting 1 stars (Valcheva+, 2015)
Properties of the Young Milky Way globular cluster Whiting 1 from near-infrared
photometry.
Valcheva A.T., Ovcharov E.P., Lalova A.D., Nedialkov P.L., Ivanov V.D.,
Carraro G.
<Mon. Not. R. Astron. Soc., 446, 730-736 (2015)>
=2015MNRAS.446..730V 2015MNRAS.446..730V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry
Keywords: globular clusters: general - globular clusters: individual: Sgr dSph -
globular clusters: individual: Whiting 1 -
galaxies: clusters: general -
galaxies: clusters: individual: ClG J020256.6-031609
Abstract:
Whiting 1 is a member of the fast-growing group of young globular
clusters in the Milky Way halo. Preliminary estimates of its
fundamental parameters have been provided using optical photometry and
low-resolution spectroscopy. In an attempt to strengthen our knowledge
of Whiting 1, in this study we employ a complementary approach.
Isochrone fitting method was applied on the near-infrared
colour-magnitude diagram and yields an age t=5.7±0.3Gyr,
metallicity z=0.006±0.001 ([Fe/H]=-0.5±0.1) and distance
modulus (m-M)0=17.48±0.10. Our results confirm that
Whiting 1 is a young and moderately metal-rich globular cluster. It is
one of the youngest from the Sgr dSph. We fitted an Elson, Fall and
Freeman (EFF) profile to the near-infrared number counts, and measured
cluster core radius rc=9.1±3.9". Two probable
eclipsing variables in the cluster were found from multi-epoch
V-band photometry. Finally, an unknown galaxy cluster was identified
on our K versus (J-K) colour-magnitude diagram. It
has a redshift z∼1, and it is located at about 1arcmin from the centre
of Whiting 1 at αJ2000= 02:02:56.6, δJ2000=-03:16:09,
contaminating the cluster photometry.
Description:
Whiting 1 was observed in the NIR on 2006 September 4 at the ESO NTT
(New Technology Telescope) with SofI (Son of ISAAC) in large-field
imaging mode.
Optical images of Whiting 1 were collected with EMMI (ESO Multi-Mode
Instrument) and EFOSC2 (ESO Faint Object Spectrograph and Camera) on
the 3.58-m ESO NTT at La Silla, Chile, typically to fill small gaps in
other programmes or during periods of poor weather conditions.
Objects:
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RA (2000) DE Designation(s)
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02 02 56.8 -03 15 10 Whiting 1 = NAME WHITING 1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 137 880 Photometry of the stars in Whiting 1 and the
surrounding field
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See also:
J/A+A/466/181 : BVI photometry of Whiting 1 (Carraro+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/881] Sequential number
5 I1 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17 I1 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 25 F4.1 arcsec DEs Declination (J2000)
27- 32 F6.3 mag Vmag1 ?=-9.999 First epoch V magnitude
34- 39 F6.3 mag e_Vmag1 ?=-9.999 rms uncertainty on Vmag1
41- 46 F6.3 mag Vmag2 ?=-9.999 Second epoch V magnitude
48- 53 F6.3 mag e_Vmag2 ?=-9.999 rms uncertainty on Vmag2
55- 60 F6.3 mag Vmag3 ?=-9.999 Third epoch V magnitude
62- 67 F6.3 mag e_Vmag3 ?=-9.999 rms uncertainty on Vmag3
69- 74 F6.3 mag Vmag4 ?=-9.999 Fourth epoch V magnitude
76- 81 F6.3 mag e_Vmag4 ?=-9.999 rms uncertainty on Vmag4
83- 88 F6.3 mag Vmag5 ?=-9.999 Fifth epoch V magnitude
90- 95 F6.3 mag e_Vmag5 ?=-9.999 rms uncertainty on Vmag5
97-102 F6.3 mag Imag ?=-9.999 New I magnitude
104-109 F6.3 mag e_Imag ?=-9.999 rms uncertainty on Imag
111-116 F6.3 mag Jmag ?=-9.999 J magnitude
118-123 F6.3 mag e_Jmag ?=-9.999 rms uncertainty on Jmag
125-130 F6.3 mag Kmag ?=-9.999 K magnitude
132-137 F6.3 mag e_Kmag ?=-9.999 rms uncertainty on Kmag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Jun-2015