J/AJ/152/192 WOCS. LXXII. A uvbyCaHb study of NGC 2506 (Anthony-Twarog+, 2016)
WIYN open cluster study. LXXII. A uvbyCaHβ CCD analysis of the
metal-deficient open cluster NGC 2506.
Anthony-Twarog B.J., Deliyannis C.P., Twarog B.A.
<Astron. J., 152, 192-192 (2016)>
=2016AJ....152..192A 2016AJ....152..192A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, uvby ;
Photometry, beta
Keywords: methods: observational - techniques: photometric -
open clusters and associations: individual: NGC 2506
Abstract:
Precision uvbyCaHβ photometry of the metal-deficient, old open
cluster NGC2506 is presented. The survey covers an area of 20'*20' and
extends to V∼18 for b-y and Hβ and to V∼17.0 for c1 and hk. For
V brighter than 16.0, photometric scatter among the indices leads to
the recovery of six known variables within the cluster core and five
new variables in the outer 5' of the survey field. Proper motions,
radial velocities, and precise multicolor indices are used to isolate
a highly probable sample of cluster members from the very rich
color-magnitude diagram. From 257 highly probable members at the
cluster turnoff, we derive a reddening estimate of
E(b-y)=0.042±0.001 (E(B-V)=0.058±0.001), where the errors refer to
the internal standard errors of the mean. [Fe/H] is derived from the
A/F dwarf members using both m1 and hk, leading to
[Fe/H]=-0.296±0.011 (sem) and -0.317±0.004 (sem), respectively.
The weighted average, heavily dominated by hk, is
[Fe/H]=-0.316±0.033. Based on red giant members, we place an upper
limit of ±0.010 on the variation in the reddening across the face of
the cluster. We also identify two dozen potential red giant cluster
members outside the cluster core. Victoria-Regina isochrones on the
Stromgren system produce an excellent match to the cluster for an
apparent modulus of (m-M)=12.75±0.1 and an age of 1.85±0.05Gyr.
Description:
NGC2506 was observed using the 1.0m telescope operated by the SMARTS
consortium at Cerro Tololo Inter-American Observatory (CTIO) over the
UT dates 2011 December 16-22. The telescope was equipped with an STA
4000*4000 CCD camera yielding a field of view of 20' on a side at the
Cassegrain focus of the 1.0m telescope. Filters owned by the
University of Kansas were used to obtain images in each of the
extended Stromgren system bandpasses (uvbyCa and the two Hβ
bandpasses). With the exception of 2011 December 20/21, all of the
nights were photometric. Table2 describes calibrated photometry for
2229 stars.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 156 2229 Stromgren photometry in NGC 2506
--------------------------------------------------------------------------------
See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)
II/215 : uvby-beta Catalogue (Hauck+ 1997)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
J/AJ/150/134 : uvbyCaHβ photometry of NGC 752 (Twarog+, 2015)
J/AJ/148/51 : WIYN Open Cluster. LXI. NGC 6819 (Anthony-Twarog+, 2014)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/AJ/139/2034 : NGC 6253 stars equivalent widths (Anthony-Twarog+, 2010)
J/A+A/485/303 : RVs for 1309 stars and 166 OCl (Mermilliod+, 2008)
J/A+A/465/965 : BI light curve of NGC 2506 variables (Arentoft+, 2007)
J/AJ/131/461 : Stromgren photometry of NGC 2420 (Anthony-Twarog+, 2006)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)
J/AJ/129/872 : Stromgren photometry of NGC 2243 (Anthony-Twarog+, 2005)
J/AJ/127/1000 : Stromgren photometry of NGC 3680 (Anthony-Twarog+, 2004)
J/AJ/125/1383 : Stromgren photometry of NGC 6253 (Anthony-Twarog+, 2003)
J/AJ/119/2282 : Stromgren photometry of IC 4651 (Anthony-Twarog+, 2000)
J/AJ/109/2828 : CaII H and K filter photometry II. (Twarog+ 1995)
http://webda.physics.muni.cz/ : WEBDA database
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 8 F7.2 pix Xpos [-552.35/656.22] WEBDA X pixel coordinate
10- 16 F7.2 pix Ypos [-615.61/637.53] WEBDA Y pixel coordinate
18- 27 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
29- 38 F10.6 deg DEdeg Declination in decimal degrees (J2000)
40- 43 I4 --- WEBDA [1101/5387]? WEBDA identification number
45- 48 F4.2 --- Mm [0/1]? Membership probability (1)
50- 55 F6.3 mag Vmag [10.76/18] The V-band magnitude
57- 62 F6.3 mag b-y [0.013/1.221] The Stromgren (b-y) color index
64- 69 F6.3 mag m1 [-0.165/0.867]?=9.999 The Stromgren metallicity
index m1=(v-b)-(b-y)
71- 76 F6.3 mag c1 [-0.177/1.21]?=9.999 The Stromgren discontinuity
index c1=(u-v)-(v-b)
78- 83 F6.3 mag hk [-0.053/1.937]?=9.999 The Stromgren hk index
85- 90 F6.3 mag Hb [2.37/9.51]?=9.999 The Hβ index
92- 97 F6.3 mag e_Vmag [0/0.092] The 1σ uncertainty in Vmag
99-104 F6.3 mag e_b-y [0.001/0.12] The 1σ uncertainty in b-y
106-111 F6.3 mag e_m1 [0.002/0.29]?=9.999 The 1σ uncertainty in m1
113-118 F6.3 mag e_c1 [0.002/0.4]?=9.999 The 1σ uncertainty in c1
120-125 F6.3 mag e_hk [0.002/0.25]?=9.999 The 1σ uncertainty in hk
127-132 F6.3 mag e_Hb [0.001/0.19]?=9.999 The 1σ uncertainty in Hb
134-135 A2 --- Class Calibration classification (B, BV, D, DV, G,
or GV) (2)
137-138 I2 --- Ny [2/23] Number of y filter observations
140-141 I2 --- Nb [2/14] Number of b filter observations
143-144 I2 --- Nv [0/9] Number of v filter observations
146-147 I2 --- Nu [0/14] Number of u filter observations
149-150 I2 --- NCa [0/14] Number of Ca filter observations
152-153 I2 --- Nn [0/8] Number of Hβ narrow filter observations
155-156 I2 --- Nw [0/8] Number of Hβ wide filter observations
--------------------------------------------------------------------------------
Note (1): Chiu & Van Altena (1981ApJ...243..827C 1981ApJ...243..827C).
Note (2): The classification scheme is defined as follows:
B = Blue dwarf;
BV = Blue dwarf Variable;
G = cool Giant;
GV = cool Giant Variable;
D = cool Dwarf;
DV = cool Dwarf Variable.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
von Hippel et al., Pap I 1998AJ....116.1789V 1998AJ....116.1789V
Sarajedini, et al., Pap II 1999AJ....118.2894S 1999AJ....118.2894S
Sarajedini, Pap III 1999AJ....118.2321S 1999AJ....118.2321S
Sarajedini et al., Pap IV 1999AJ....118.2894S 1999AJ....118.2894S
Barrado et al., Pap V 2001ApJ...549..452B 2001ApJ...549..452B
Sills & Deliyannis, Pap VI 2000ApJ...544..944S 2000ApJ...544..944S
Platais et al., Pap VII 2001AJ....122.1486P 2001AJ....122.1486P, Cat. J/AJ/122/1486
Platais et al., Pap VIII 2002AJ....124..601P 2002AJ....124..601P, Cat. J/AJ/124/601
Stassun et al., Pap IX 2002A&A...382..899S 2002A&A...382..899S, Cat. J/A+A/382/899
Grocholski & Sarajedini, Pap X 2002AJ....123.1603G 2002AJ....123.1603G
von Hippel et al., Pap XI 2002AJ....124.1555V 2002AJ....124.1555V
Deliyannis et al., Pap XII 2002ApJ...577L..39D 2002ApJ...577L..39D
Barnes Pap XIII 2003ApJ...586..464B 2003ApJ...586..464B
Barnes Pap XIV 2003ApJ...586L.145B 2003ApJ...586L.145B
Kafka & Honeycutt, Pap XV 2003AJ....126..276K 2003AJ....126..276K
Grocholski & Sarajedini, Pap XVI 2003MNRAS.345.1015G 2003MNRAS.345.1015G
Platais et al., Pap XVII 2003AJ....126.2922P 2003AJ....126.2922P, Cat. J/AJ/126/2922
Mathieu et al., Pap XVIII 2004ApJ...602L.121M 2004ApJ...602L.121M
Sarajedini, et al., Pap XIX 2004AJ....127..991S 2004AJ....127..991S
Kafka et al., Pap XX 2004AJ....127.1622K 2004AJ....127.1622K
Steinhauer & Deliyannis, Pap XXI 2004ApJ...614L..65S 2004ApJ...614L..65S
Meibom & Mathieu, Pap XXII 2005ApJ...620..970M 2005ApJ...620..970M
von Hippel et al., Pap XXIII 2006ApJ...645.1436V 2006ApJ...645.1436V
Hole et al. Pap XXIV 2009AJ....138..159H 2009AJ....138..159H, Cat. J/AJ/138/159
James et al., Pap XXV
Platais et al., Pap XXVI 2007A&A...461..509P 2007A&A...461..509P, Cat. J/A+A/461/509
Kafka et al., Pap XXVII
Giampapa et al., Pap XXVIII 2006ApJ...651..444G 2006ApJ...651..444G
Meibom et al., Pap XXIX 2006ApJ...653..621M 2006ApJ...653..621M
Jeffery et al., Pap XXX 2007ApJ...658..391J 2007ApJ...658..391J
Meibom et al., Pap XXXI 2007ApJ...665L.155M 2007ApJ...665L.155M
Geller et al., Pap XXXII 2008AJ....135.2264G 2008AJ....135.2264G, Cat. J/AJ/135/2264
Yadav et al., Pap XXXIII 2008A&A...484..609Y 2008A&A...484..609Y, Cat. J/A+A/484/609
Meibom et al., Pap XXXIV 2009ApJ...695..679M 2009ApJ...695..679M, Cat. J/ApJ/695/679
Platais et al., Pap XXXV 2008MNRAS.391.1482P 2008MNRAS.391.1482P, Cat. J/MNRAS/391/1482
Geller et al., Pap XXXVI 2009AJ....137.3743G 2009AJ....137.3743G, Cat. J/AJ/137/3743
Meibom et al., Pap XXXVII 2009AJ....137.5086M 2009AJ....137.5086M, Cat. J/AJ/137/5086
Geller et al., Pap XXXVIII 2010AJ....139.1383G 2010AJ....139.1383G, Cat. J/AJ/139/1383
Anthony-Twarog et al., Pap XXXIX 2010AJ....139.2034A 2010AJ....139.2034A, Cat. J/AJ/139/2034
Sarajedini et al., Pap XL 2009ApJ...698.1872S 2009ApJ...698.1872S
Chumak et al., Pap XLI 2010MNRAS.402.1841C 2010MNRAS.402.1841C
Casetti-Dinescu et al., Pap XLII 2010AJ....139.1889C 2010AJ....139.1889C
James et al., Pap XLIII 2010A&A...515A.100J 2010A&A...515A.100J, Cat. J/A+A/515/A100
Platais et al., Pap XLIV 2011MNRAS.413.1024P 2011MNRAS.413.1024P, Cat. J/MNRAS/413/1024
Meibom et al., Pap XLV 2011ApJ...733..115M 2011ApJ...733..115M, Cat. J/ApJ/733/115
Platais et al., Pap XLVI 2011ApJ...733L...1P 2011ApJ...733L...1P
Gosnell et al., Pap XLVII 2012ApJ...745...57G 2012ApJ...745...57G
Geller & Mathieu , Pap XLVIII 2012AJ....144...54G 2012AJ....144...54G
Platais et al., Pap XLIX 2012ApJ...751L...8P 2012ApJ...751L...8P
Cummings et al., Pap L 2012AJ....144..137C 2012AJ....144..137C
Geller et al., Pap LI 2013AJ....145....8G 2013AJ....145....8G
Yang et al., Pap LII 2013ApJ...762....3Y 2013ApJ...762....3Y
Sandquist et al., Pap LIII 2013ApJ...762...58S 2013ApJ...762...58S
Anthony-Twarog, Pap LIV 2013ApJ...767L..19A 2013ApJ...767L..19A
Platais et al., Pap LV 2013AJ....146...43P 2013AJ....146...43P, Cat. J/AJ/146/43
Pap LVI
Maderak et al., Pap LVII 2013AJ....146..143M 2013AJ....146..143M
Pap LVIII
Tofflemire et al., Pap LIX 2014AJ....148...61T 2014AJ....148...61T, Cat. J/AJ/148/61
Milliman et al., Pap LX 2014AJ....148...38M 2014AJ....148...38M, Cat. J/AJ/148/38
Anthony-Twarog et al., Pap LXI 2014AJ....148...51A 2014AJ....148...51A, Cat. J/AJ/148/51
Thompson et al., Pap LXII 2014AJ....148...85T 2014AJ....148...85T, Cat. J/AJ/148/85
Maderak et al., Pap LXIII 2015AJ....149..141M 2015AJ....149..141M
Pap LXIV
Lee-Brown et al., Pap LXV 2015AJ....149..121L 2015AJ....149..121L, Cat. J/AJ/149/121
Leiner et al., Pap LXVI 2015AJ....150...10L 2015AJ....150...10L, Cat. J/AJ/150/10
Geller et al., Pap LXVII 2015AJ....150...97G 2015AJ....150...97G, cat. J/AJ/150/97
Pap LXVIII
Pap LXIX
Pap LXX
Milliman et al., Pap LXXI 2016AJ....151..152M 2016AJ....151..152M, Cat. J/AJ/151/152
Anthony-Twarog et al., Pap LXXII 2016AJ....152..192A 2016AJ....152..192A, cat. J/AJ/152/192
Pap LXXIII
Pap LXXIV
Cummings et al., Pap LXXV 2017AJ....153..128C 2017AJ....153..128C
Anthony-Twarog et al., Pap LXXVI 2018AJ....155..138A 2018AJ....155..138A
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 10-Feb-2017