J/AJ/123/3460 Low-amplitude variables in NGC 6791 (Mochejska+, 2002)
Planets in stellar clusters extensive search.
I. Discovery of 47 low-amplitude variables in the metal-rich cluster NGC 6791
with millimagnitude image subtraction photometry.
Mochejska B.J., Stanek K.Z., Sasselov D.D., Szentgyorgyi A.H.
<Astron. J. 123, 3460 (2002)>
=2002AJ....123.3460M 2002AJ....123.3460M
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry
Keywords: binaries: eclipsing - color-magnitude diagrams -
novae, cataclysmic variables - stars: variables: other
Abstract:
We have undertaken a long-term project, the Planets in Stellar
Clusters Extensive Search (PISCES), to search for transiting planets
in open clusters. As our first target, we have chosen NGC 6791, a very
old, populous, metal-rich cluster. We present the results of a test
observing run at the F.L. Whipple Observatory's 1.2 m telescope, from
2001 July 6 to August 1. Our primary goal is to demonstrate the
feasibility of obtaining the accuracy required for planetary-transit
detection using image subtraction photometry on data collected with a
1 m class telescope. We present a catalog of 62 variable stars, 47 of
them newly discovered, most with low-amplitude variability. Among
those there are several BY Draconis type variables. We have also
observed outbursts in the cataclysmic variables B7 and B8.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 63 30 Eclipsing binaries in NGC 6791
table2.dat 61 21 Other periodic variables in NGC 6791
table3.dat 61 11 Other periodic variables in NGC 6791
lcurve/* . 121 Light curves
(lcR.VNN, lcV.VNN, lcr.VNN, lcR.BNN, lcV.BNN)
--------------------------------------------------------------------------------
See also:
J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)
ftp://cfa-ftp.harvard.edu/pub/bmochejs/PISCES : PISCES papers and data related
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- ID Identification name (VNN or BN)
(VNN = Cl* NGC 6791 KR NN in Simbad)
BNN = Cl* NGC 6791 KU BNN in Simbad)
5- 13 F9.6 h RAhour Decimal right ascension (J2000)
15- 23 F9.6 deg DEdeg Decimal declination (J2000)
25- 31 F7.4 d Per ? Period
34- 39 F6.3 mag Rmax ? R magnitude at maximum
40 A1 --- n_Rmax [a] a: Instrumental magnitude
42- 47 F6.3 mag Vmax ? V magnitude at maximum
50- 54 F5.3 mag AR ? Amplitude in R band
57- 61 F5.3 mag AV ? Amplitude in V band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lcurve/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d HJD-2450000 Heliocentric Julian date (HJD - 2450000)
14- 19 F6.3 mag mag Magnitude (R, r or V)
22- 26 F5.3 mag e_mag rms uncertainty on mag
--------------------------------------------------------------------------------
History:
From electronic version of the journal and
ftp://cfa-ftp.harvard.edu/pub/bmochejs/PISCES/
(End) James Marcout, Patricia Bauer [CDS] 06-Sep-2002