J/MNRAS/465/2748 Haffner 9 CT1 photometry (Piatti+, 2017)
Towards a comprehensive knowledge of the open cluster Haffner 9.
Piatti A.E.
<Mon. Not. R. Astron. Soc., 465, 2748-2756 (2017)>
=2017MNRAS.465.2748P 2017MNRAS.465.2748P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CMT1T2V
Keywords: techniques: photometric - open clusters and associations: general
Abstract:
We turn our attention to Haffner 9, a Milky Way open cluster whose
previous fundamental parameter estimates are far from being in
agreement. In order to provide with accurate estimates, we present
high-quality Washington CT1 and Johnson BVI photometry of the
cluster field. We put particular care in statistically cleaning the
colour-magnitude diagrams (CMDs) from field star contamination, which
was found a common source in previous works for the discordant
fundamental parameter estimates. The resulting cluster CMD fiducial
features were confirmed from a proper motion membership analysis.
Haffner 9 is a moderately young object (age∼350Myr), placed in
the Perseus arm - at a heliocentric distance of ∼3.2kpc - , with
a lower limit for its present mass of ∼160M☉ and of nearly
metal solar content. The combination of the cluster structural and
fundamental parameters suggest that it is in an advanced stage of
internal dynamical evolution, possibly in the phase typical of those
with mass segregation in their core regions. However, the cluster
still keeps its mass function close to that of the Salpeter's law.
Description:
We used CCD images obtained on the nights of 2004 December 18 and 19
with a 2048x2048pixel Tektronix CCD attached to the 0.9-m telescope
(scale 0.396arcsec/pix) at Cerro Tololo Inter-American Observatory
(CTIO, Chile). Its field of view (FOV) is 13.6x13.6arcmin2. We
used the Washington C (Canterna, 1976AJ.....81..228C 1976AJ.....81..228C) and
Kron-Cousins R filters.
We also utilized images for the Small Magellanic Cloud cluster Lindsay
106, which was previously observed at La Silla (ESO, Chile) with the C
and T1 filters (Piatti et al., 2007MNRAS.382.1203P 2007MNRAS.382.1203P, Cat.
J/MNRAS/382/1203). Lindsay 106 was used here only as control cluster,
i.e. to verify the quality of the present CTIO photometry.
Objects:
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RA (2000) DE Designation(s)
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07 24 42 -17 00 10 Haffner 9 = Cl Haffner 9
01 30 38 -76 02 16 Lindsay 106 = ESO 29-44
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 66 1139 CT1 data of stars in the field of Haffner 9
table3.dat 63 567 CT1 data of stars in the field of Lindsay 106
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See also:
J/MNRAS/382/1203 : CT1 photometry of 5 SMC star clusters (Piatti+, 2007)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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3- 6 I4 --- Star Star sequential number
8- 15 F8.3 pix Xpos X position
17- 24 F8.3 pix Ypos Y position
28- 33 F6.3 mag T1mag Washington T1 magnitude
38- 42 F5.3 mag e_T1mag rms uncertainty on T1
45 I1 --- o_T1mag ? Number of observation for T1mag
49- 54 F6.3 mag C-T1 Washington C-T1 colour index
59- 63 F5.3 mag e_C-T1 rms uncertainty on C-T1
66 I1 --- o_C-T1 ? Number of observation for C-T1
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Nov-2018