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J/MNRAS/391/1482    BVIc photometry of Trumpler 20           (Platais+, 2008)

Trumpler 20 - an old and rich open cluster. Platais I., Melo C., Fulbright J.P., Kozhurina-Platais V., Figueira P., Barnes S.A., Mendez R.A. <Mon. Not. R. Astron. Soc., 391, 1482-1488 (2008)> =2008MNRAS.391.1482P
ADC_Keywords: Clusters, open ; Photometry, UBVRI Keywords: stars: abundances - open clusters and associations: individual: Trumpler 20 Abstract: We show that the open cluster Trumpler 20, contrary to the earlier findings, is actually an old Galactic open cluster. New CCD photometry and high-resolution spectroscopy are used to derive the main parameters of this cluster. At [Fe/H]=-0.11 for a single red giant star, the metallicity is slightly subsolar. The best fit to the colour-magnitude diagrams is achieved using a 1.3-Gyr isochrone with convective overshoot. The cluster appears to have a significant reddening at E(B-V)=0.46 (for B0 spectral type), although for red giants this high reddening yields the colour temperature exceeding the spectroscopic Teff by about 200K. Trumpler 20 is a very rich open cluster, containing at least 700 members brighter than MV=+4. It may extend over the field of view available in our study at 20x20arcmin2. Description: In 2008 March 20-22, new photometric CCD observations of Tr 20 were obtained at the CTIO 1-m telescope, operated by the Small and Moderate Aperture Research Telescope System (SMARTS) consortium. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tr20.dat 67 7166 BVI photometry in Tr 20
See also: J/ApJS/161/118 : Photometry of open clusters (McSwain+, 2005) Byte-by-byte Description of file: tr20.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Sequential number, Cl* Trumpler 20 PMF NNNN in Simbad 6- 14 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000) 26- 31 F6.3 mag Vmag Johnson V magnitude 33- 38 F6.3 mag B-V ?=99.999 Johnson B-V colour index 40- 45 F6.3 mag V-Ic ?=99.999 Johnson-Cousins V-Ic colour index 47- 51 F5.3 mag e_Vmag rms uncertainty on Vmag 53- 57 F5.3 mag e_B-V ?=0.000 rms uncertainty on B-V 59- 63 F5.3 mag e_V-Ic ?=0.000 rms uncertainty on V-Ic 65 I1 --- o_B-V Number of observations in B-V 67 I1 --- o_V-Ic Number of observations in V-Ic
History: From electronic version of the journal References: von Hippel et al., Pap I 1998AJ....116.1789V Sarajedini, et al., Pap II 1999AJ....118.2894S Sarajedini, Pap III 1999AJ....118.2321S Sarajedini et al., Pap IV 1999AJ....118.2894S Barrado et al., Pap V 2001ApJ...549..452B Sills & Deliyannis, Pap VI 2000ApJ...544..944S Platais et al., Pap VII 2001AJ....122.1486P, Cat. J/AJ/122/1486 Platais et al., Pap VIII 2002AJ....124..601P, Cat. J/AJ/124/601 Stassun et al., Pap IX 2002A&A...382..899S, Cat. J/A+A/382/899 Grocholski & Sarajedini, Pap X 2002AJ....123.1603G von Hippel et al., Pap XI 2002AJ....124.1555V Deliyannis et al., Pap XII 2002ApJ...577L..39D Barnes Pap XIII 2003ApJ...586..464B Barnes Pap XIV 2003ApJ...586L.145B Kafka & Honeycutt, Pap XV 2003AJ....126..276K Grocholski & Sarajedini, Pap XVI 2003MNRAS.345.1015G Platais et al., Pap XVII 2003AJ....126.2922P, Cat. J/AJ/126/2922 Mathieu et al., Pap XVIII 2004ApJ...602L.121M Sarajedini, et al., Pap XIX 2004AJ....127..991S Kafka et al., Pap XX 2004AJ....127.1622K Steinhauer & Deliyannis, Pap XXI 2004ApJ...614L..65S Meibom & Mathieu, Pap XXII 2005ApJ...620..970M von Hippel et al., Pap XXIII 2006ApJ...645.1436V Hole et al. Pap XXIV 2009AJ....138..159H, Cat. J/AJ/138/159 James et al., Pap XXV Platais et al., Pap XXVI 2007A&A...461..509P, Cat. J/A+A/461/509 Kafka et al., Pap XXVII Giampapa et al., Pap XXVIII 2006ApJ...651..444G Meibom et al., Pap XXIX 2006ApJ...653..621M Jeffery et al., Pap XXX 2007ApJ...658..391J Meibom et al., Pap XXXI 2007ApJ...665L.155M Geller et al., Pap XXXII 2008AJ....135.2264G, Cat. J/AJ/135/2264 Yadav et al., Pap XXXIII 2008A&A...484..609Y, Cat. J/A+A/484/609 Meibom et al., Pap XXXIV 2009ApJ...695..679M, Cat. J/ApJ/695/679 Geller et al., Pap XXXVI 2009AJ....137.3743G, Cat. J/AJ/137/3743 Meibom et al., Pap XXXVII 2009AJ....137.5086M, Cat. J/AJ/137/5086 Geller et al., Pap XXXVIII 2010AJ....139.1383G, Cat. J/AJ/139/1383 Anthony-Twarog et al., Pap XXXIX 2010AJ....139.2034A, Cat. J/AJ/139/2034 Sarajedini et al., Pap XL 2009ApJ...698.1872S Chumak et al., Pap XLI 2010MNRAS.402.1841C Casetti-Dinescu et al., Pap XLII 2010AJ....139.1889C James et al., Pap XLIII 2010A&A...515A.100J, Cat. J/A+A/515/A100 Platais et al., Pap XLIV 2011MNRAS.413.1024P, Cat. J/MNRAS/413/1024 Meibom et al., Pap XLV 2011ApJ...733..115M, Cat. J/ApJ/733/115 Platais et al., Pap XLVI 2011ApJ...733L...1P Gosnell et al., Pap XLVII 2012ApJ...745...57G Geller & Mathieu , Pap XLVIII 2012AJ....144...54G Platais et al., Pap XLIX 2012ApJ...751L...8P Cummings et al., Pap L 2012AJ....144..137C Geller et al., Pap LI 2013AJ....145....8G Yang et al., Pap LII 2013ApJ...762....3Y Sandquist et al., Pap LIII 2013ApJ...762...58S Anthony-Twarog, Pap LIV 2013ApJ...767L..19A Platais et al., Pap LV 2013AJ....146...43P, Cat. J/AJ/146/43 Pap LVI Maderak et al., Pap LVII 2013AJ....146..143M Pap LVIII Tofflemire et al., Pap LIX 2014AJ....148...61T, Cat. J/AJ/148/61 Milliman et al., Pap LX 2014AJ....148...38M, Cat. J/AJ/148/38 Anthony-Twarog et al., Pap LXI 2014AJ....148...51A, Cat. J/AJ/148/51 Thompson et al., Pap LXII 2014AJ....148...85T, Cat. J/AJ/148/85 Maderak et al., Pap LXIII 2015AJ....149..141M Pap LXIV Lee-Brown et al., Pap LXV 2015AJ....149..121L, Cat. J/AJ/149/121 Leiner et al., Pap LXVI 2015AJ....150...10L, Cat. J/AJ/150/10
(End) Patricia Vannier [CDS] 07-Apr-2009
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