J/AJ/131/461 Stromgren photometry of NGC 2420 (Anthony-Twarog+, 2006)
vbyCaHβ CCD photometry of clusters.
VI. The metal-deficient open cluster NGC 2420.
Anthony-Twarog B.J., Tanner D., Cracraft M., Twarog B.A.
<Astron. J., 131, 461-472 (2006)>
=2006AJ....131..461A 2006AJ....131..461A
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, uvby
Keywords: open clusters and associations: individual (NGC 2420) -
techniques: photometric
Abstract:
CCD photometry on the intermediate-band vbyCaHβ system is
presented for the metal-deficient open cluster NGC 2420. Restricting
the data to probable single members of the cluster using the CMD and
the photometric indices alone generates a sample of 106 stars at the
cluster turnoff.
Description:
The new photometric data for NGC 2420 were obtained using the 0.9m
WIYN telescope on Kitt Peak. The S2KB detector is a 2048x2048pix CCD
mounted at the f/7.5 focus of the telescope. The field size is
approximately 20' on a side. We obtained frames of NGC 2420 over two
six-night runs in 2003 January and 2004 January, using our own 3"x3"
Hβ and Ca filters and borrowed 4"x4" y, b, and v filters from
Kitt Peak National Observatory (KPNO). Data from five nights in 2003
and four nights in 2004 were incorporated in the analysis of NGC 2420
photometry.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 1195 Extended Stromgren photometry in NGC 2420
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See also:
J/AJ/119/2282 : Stromgren photometry of IC 4651 (Anthony-Twarog+, 2000)
J/AJ/125/1383 : Stromgren photometry of NGC 6253 (Anthony-Twarog+, 2003)
J/AJ/127/1000 : Stromgren photometry of NGC 3680 (Anthony-twarog+, 2004)
J/AJ/129/872 : Stromgren photometry of NGC 2243 (Anthony-Twarog+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- WEBDA The WEBDA database number (1)
5 A1 --- m_WEBDA Multiplicity index on WEBDA
7- 13 F7.2 pix Xpos The X pixel coordinate (1)
15- 21 F7.2 pix Ypos The Y pixel coordinate (1)
24- 29 F6.3 mag Vmag Johnson V band magnitude
31- 36 F6.3 mag b-y Stromgren (b-y) color index
38- 43 F6.3 mag m1 ? Stromgren m1 band magnitude
45- 50 F6.3 mag Hb ? Stromgren Hβ band magnitude
52- 57 F6.3 mag hk ? hk index [(Ca-b) - (b-y)]
59- 63 F5.3 mag e_Vmag The 1σ error in Vmag
65- 69 F5.3 mag e_b-y The 1σ error in b-y
71- 75 F5.3 mag e_m1 ? The 1σ error in m1
77- 81 F5.3 mag e_Hb ? The 1σ error in Hb
83- 87 F5.3 mag e_hk ? The 1σ error in hk
89- 91 I3 --- Ny Number of y band observations
93- 94 I2 --- Nb Number of b band observations
96- 97 I2 --- Nv Number of v band observations
99-100 I2 --- Nw Number of w band observations
102-103 I2 --- Nn Number of n band observations
105-106 I2 --- NCa Number of Ca band observations
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Note (1): Identifications and XY-coordinates are on the system found in the
WEBDA cluster database. For those stars not included in the WEBDA
database, an identification number has been created beginning with 6000.
NNN are NGC 2420 NNN in Simbad.
NNNN are Cl* NGC 2420 ATC NNNN in Simbad.
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History:
From electronic version of the journal
References:
Anthony-Twarog & Twarog, Paper I 2000AJ....119.2282A 2000AJ....119.2282A, Cat. J/AJ/119/2282
Anthony-Twarog & Twarog, Paper II 2000AJ....120.3111A 2000AJ....120.3111A
Twarog et al., Paper III 2003AJ....125.1383T 2003AJ....125.1383T, Cat. J/AJ/125/1383
Anthony-Twarog & Twarog, Paper IV 2004AJ....127.1000A 2004AJ....127.1000A, Cat. J/AJ/127/1000
Anthony-Twarog et al., Paper V 2005AJ....129..872A 2005AJ....129..872A, Cat. J/AJ/129/872
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 03-Nov-2006