J/AJ/146/43 WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
WIYN open cluster study. LV. Astrometry and membership in NGC 6819.
Platais I., Gosnell N.M., Meibom S., Kozhurina-Platais V., Bellini A.,
Veillet C., Burkhead M.S.
<Astron. J., 146, 43 (2013)>
=2013AJ....146...43P 2013AJ....146...43P
ADC_Keywords: Clusters, open ; Proper motions ; Photometry, CCD ;
X-ray sources ; Cross identifications
Keywords: astrometry - open clusters and associations: individual: NGC 6819
Abstract:
We present proper motions and astrometric membership analysis for
15750 stars around the intermediate-age open cluster NGC 6819. The
accuracy of relative proper motions for well-measured stars ranges
from ∼0.2mas/yr within 10' of the cluster center to 1.1mas/yr outside
this radius. In the proper motion vector-point diagram, the separation
between the cluster members and field stars is convincing down to V∼18
and within 10' from the cluster center. The formal sum of membership
probabilities indicates a total of ∼2500 cluster members down to V∼22.
We confirm the cluster membership of several variable stars, including
some eclipsing binaries. The estimated absolute proper motion of NGC
6819 is µxabs=-2.6±0.5 and µyabs=-4.2±0.5mas/yr. A
cross-identification between the proper motion catalog and a list of
X-ray sources in the field of NGC 6819 resulted in a number of new
likely optical counterparts, including a candidate CV. For the first
time we show that there is significant differential reddening toward
NGC 6819.
Description:
As part of the WIYN Open Cluster Study (WOCS; Mathieu,
2000ASPC..198..517M 2000ASPC..198..517M), we initiated a proper motion study of NGC 6819
based upon the new measurements of archival long-focus photographic
plates in combination with recent CCD observations. A total of 30
scanned photographic plates are available for NGC 6819. However, only
23 of them are adequate for the purpose of astrometry. The plates are
taken with the McDonald 82inch, the Yale 1m, the Hale 5m, the Mt.
Wilson 60inch, and the CFHT 3.6m (Table1).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 51 5 Photographic plates and a set of CCD frames used in
this study
table4.dat 99 15750 Catalog of positions and proper motions in NGC 6819
table5.dat 82 51 Proposed optical counterparts of X-Ray sources
in NGC 6819
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See also:
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)
J/AJ/126/2922 : Astrometry & membership in NGC 188 (Platais+, 2003; Pap XVII)
J/AJ/124/601 : Absolute positions and proper motions in NGC 188
(Platais+, 2002; Paper VIII)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Tel Telescope
20- 27 A8 --- Plate Number of plates in blue (B) and visual (V)
bandpasses
29- 32 I4 yr Epoch Mean epoch (or beginning of Epoch)
33- 35 A3 --- Epoch2 Most recent epoch (1919-33)
37- 38 I2 mag Vlim [17/23] Approximate limiting V magnitude
40- 43 F4.1 arcsec/mm Scale Plate scale
45- 51 A7 arcmin FOV Size of the field-of-view
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Star [441/999643] Star number in the master catalog
<[PGM2013] NNNNNN> in Simbad
8- 17 F10.6 deg RAdeg Right ascension (Eq=J2000, Ep=2009.875)
19- 27 F9.6 deg DEdeg Declination (Eq=J2000, Ep=2009.875)
29- 34 F6.3 mag gmag Sloan g' magnitude
36- 41 F6.3 mag g-r Sloan g'-r' color index
43- 48 F6.2 mas/yr pmRA Relative proper motion in X (RA direction)
50- 55 F6.2 mas/yr pmDE Relative proper motion in Y (Dec direction)
57- 61 F5.2 mas/yr e_pmRA Standard error in pmRA
63- 67 F5.2 mas/yr e_pmDE Standard error in pmDE
69- 72 F4.2 mas/yr epm Estimated error of proper motion in X and Y (2)
74- 75 I2 % Mb [0/99] Cluster membership probability
77- 83 F7.3 arcmin oRA Tangential coordinate along RA direction (3)
85- 91 F7.3 arcmin oDE Tangential coordinate along Dec direction (3)
93 I1 --- Nt [0/6] Number of plates for McDonald 82inch (4)
94- 95 I2 --- Nu [0/13] Number of plates for Yale 1m (4)
96 I1 --- Nv [0/2] Number of plates for Hale 5m (4)
97 I1 --- Nz [0/2] Number of plates for Mt. Wilson 60inch (4)
99 I1 --- Nd [0/1] Number of deleted datasets
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Note (2): This error is estimated from an average standard error at a given
g'-magnitude and should be used only as a guide to the reliability of
calculated proper motions and their errors.
Note (3): With zeropint at the J2000 center of NGC 6819 (RA=295.32283°,
DE=+40.19639°).
Note (4): For each datasets and used for proper motion calculation.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [XMMUJ ]
7- 21 A15 arcsec XMMUJ X-ray source name (HHMMSS.s+DDMMSS; J2000)
23- 28 I6 --- Star [388118/938065] Optical counterpart number in
the master catalog
30- 35 F6.3 mag gmag Sloan g' magnitude
37- 42 F6.3 mag g-r Sloan g'-r' color index
44- 46 F3.1 arcsec Xerr X-ray source estimated positional error from
Gosnell et al. (2012ApJ...745...57G 2012ApJ...745...57G)
48- 51 F4.2 arcsec Dist [0/4] Counterpart/X-ray source total distance
53- 57 F5.2 mas/yr pmRA ? Relative proper motion in X (RA direction)
59- 63 F5.2 mas/yr pmDE ? Relative proper motion in Y (Dec direction)
65- 66 I2 % Mb [0/99]? Cluster membership probability
(from proper motion)
68 A1 --- --- [X]
69- 70 I2 --- X [1/11]? ID number in Gosnell et al. 2012 (2)
72- 75 A4 --- --- [WOCS ]
77- 82 I6 --- WOCS ? WIYN Open Cluster Study (WOCS) number (3)
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Note (2): X-ray source ID in Gosnell et al. (2012ApJ...745...57G 2012ApJ...745...57G):
X1 is a quiescent low-mass X-ray binary candidate, X2 a cataclysmic
variable candidate, X6 a RS CVn abd X9 an active binary.
Note (3): From Hole et al. (2009, cat. J/AJ/138/159) and K. Milliman et al.
(2013, in preparation).
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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
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) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 26-Jun-2014