J/MNRAS/358/795 Variable stars in NGC 6819 field (Street+, 2005)
Variable stars in the field of open cluster NGC 6819 - II.
Street R.A., Horne K., Lister T.A., Penny A., Tsapras Y., Quirrenbach A.,
Safizadeh N., Cooke J., Mitchell D., Cameron A.C.
<Mon. Not. R. Astron. Soc., 358, 795-812 (2005)>
=2005MNRAS.358..795S 2005MNRAS.358..795S
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, CCD
Keywords: binaries: eclipsing - stars: variables: other -
open clusters and associations: individual: NGC 6819
Abstract:
We report on the discovery of 141 further variable stars found in the
field of the open cluster NGC 6819. The stars were identified from
time-series photometric data obtained on the Isaac Newton Telescope,
La Palma, during two observing runs covering the 19 nights between
1999 June 22-30 and 1999 July 22-31. The variables found include 53
eclipsing binaries, of which eight stars appear to be RS CVns, in
addition to 70 stars showing spot activity, 13 showing long-period
variability and five variables of other types.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tab3-10.dat 124 155 Details of the eclipsing binary and BY Dra systems
tab11-13.dat 124 33 Details of variables stars
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Byte-by-byte Description of file: tab3-10.dat tab11-13.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- ObsID Observation ID (CCD 1 to CCD 4)
7- 11 I5 --- SHLP Star number, Cl* NGC 6819 SHLP NNNNN in Simbad
12 A1 --- n_SHLP [*] Individual note (1)
13 A1 --- --- [(]
14- 17 I4 --- OldSeq ? star's original identification number
(in Street et al., 2003MNRAS.340.1287S 2003MNRAS.340.1287S)
18 A1 --- --- [)]
20- 22 A3 --- f_SHLP Flag on star (2)
24- 25 I2 h RAh Right ascension (J2000.0)
27- 28 I2 min RAm Right ascension (J2000.0)
30- 34 F5.2 s RAs Right ascension (J2000.0)
36 A1 --- DE- Declination sign (J2000.0)
37- 38 I2 deg DEd Declination (J2000.0)
40- 41 I2 arcmin DEm Declination (J2000.0)
43- 46 F4.1 arcsec DEs Declination (J2000.0)
48- 59 F12.4 d T0 ? Epoch of minimum light in HJD
61- 66 F6.4 d e_T0 ? rms uncertainty on T0
67 A1 --- n_T0 [m] m: multi-periodic ?
68- 75 F8.5 d Per ? Period
77- 84 F8.5 d e_Per ? rms uncertainty on Per
86- 91 F6.3 mag Vmag ? V magnitude
93- 96 F4.3 mag e_Vmag ? rms uncertainty on Vmag
98-101 F4.2 mag V-R ? V-R colour index
103-105 F3.2 mag e_V-R ? rms uncertainty on V-R
107-112 A6 --- Type Binary or variable type (3)
114 A1 --- l_Amp Limit flag on Amp
115-119 F5.3 mag Amp ? Amplitude
120-124 A5 --- n_Amp Notes on multiperiodicity (4)
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Note (1): Following reanalysis, star 30608 is now below the
threshold for variability
Note (2): Flags as follows:
C = close bright companions
B = blended
E = close to edge of frame
H = in halo of very bright star
F = close to flaw in image, e.g. dead column,
light leak or diffraction spike.
S = suspected variable
Note (3): Binary and variable types as follows:
EW = W UMa type (binary)
EA = Algol type (binary)
EB = β Lyrae type (binary)
RS CVn = RS CVn type (binary)
BY Dra = BY Dra type (binary)
LP = long period variable (variable)
Cep = Cepheid (variable)
RR Lyr = RR Lyr variable (variable)
d Scu = δ Scuti variable (variable)
Uncl = Unclassified (variable)
SV = suspected variable (variable)
Note (4): 2 entries exist in the tables for stars showing signs of
stellar activity as well as eclipses; the note specifies (act)
or (ecl) in these cases.
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History:
From electronic version of the journal
References:
Street et al., Paper I 2003MNRAS.340.1287S 2003MNRAS.340.1287S
(End) Patricia Vannier [CDS] 23-Feb-2006