J/AJ/135/907 Variables in Praesepe identified with KELT (Pepper+, 2008)
A photometric survey for variables and transits in the field of Praesepe
with the kilodegree extremely little telescope.
Pepper J., Stanek K.Z., Pogge R.W., Latham D.W., Depoy D.L., Siverd R.,
Poindexter S., Sivakoff G.R.
<Astron. J., 135, 907-921 (2008)>
=2008AJ....135..907P 2008AJ....135..907P
ADC_Keywords: Planets ; Stars, variable ; Photometry, infrared
Cross identifications ; Photometry, RI
Keywords: planetary systems - stars: activity
Abstract:
The Kilodegree Extremely Little Telescope (KELT) project is a small
aperture, wide-angle search for planetary transits of solar-type
stars. In this paper, we present the results of a commissioning
campaign with the KELT telescope to observe the open cluster Praesepe
for 34 nights in early 2005. Light curves were obtained for 69337
stars, out of which we identify 58 long-period variables and 152
periodic variables. Sixteen of these are previously known as variable,
yielding 194 newly discovered variable stars for which we provide
properties and light curves. We also searched for planetary-like
transits, finding four transit candidates. Follow-up observations
indicate that two of the candidates are astrophysical false positives,
with two candidates remaining as potential planetary transits.
Description:
The commissioning campaign targeted a field centered on Praesepe (also
called M44 and NGC 2632), an open cluster at a distance of 180parsecs.
Our observation were centered on a 10.8°x10.8° field located
at J2000 08:40:06 +19:41:06. The observing campaign was conducted
every clear night from UTC 2005 February 13 until 2005 April 27,
obtaining 5220 images.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 210 Variable stars identified in KELT observations
of Praesepe
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2010)
J/A+A/375/989 : JHK photometry of Praesepe low-mass stars (Bouvier+, 2001)
J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002)
J/ApJS/175/191 : Variables from 2MASS calibration fields (Plavchan+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [KP]
3- 8 I6 --- KP [100169/414644] KELT identification number
10 A1 --- n_KP [a] 'a' indicates a Praesepe member
12- 17 F6.3 mag Rmag KELT RK band magnitude (1)
19- 27 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
29- 36 F8.5 deg DEdeg Declination in decimal degrees (J2000)
38- 43 F6.3 mag Jmag ? 2MASS J band magnitude
45- 50 F6.3 mag Hmag ? 2MASS H band magnitude
52- 57 F6.3 mag Ksmag ? 2MASS KS band magnitude
59- 75 A17 --- 2MASS 2MASS identification (JHHMMSSss+DDMMSSs)
77 A1 --- f_2MASS [b] Multiple 2MASS matches (2)
79- 85 F7.4 d Per ? Period
87- 90 A4 --- Kclass KELT classification (EB, LPV, or Puls)
92-100 A9 --- XID GCVS/NSV identification
102-109 A8 --- Vclass GCVS/NSV classification (3)
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Note (1): The RK filter is a very braod R filter; the combined Filter+CCD
response has effective wavelength = 691nm, effective width = 318nm.
Note (2): 'b' indicates stars which matched to more than one 2MASS source
within the 9.5" matching radius. The 2MASS ID and JHK colors in the
table are for the closest match within the radius.
Note (3): Classification as follows:
V = Variable (no classification)
SR = Semiregular variable
RR Lyr = RR Lyrae-type variable
BY Dra = BY Draconis-type variable
Algol = Algol-type eclipsing system
W UMa = W UMa-type eclipsing system
EA/SD = Algol-type eclipsing system / semidetached
EA/DS/RS = Algol-type eclipsing system / detached system with a subgiant /
RS Canum Venaticorum-type system (strong CaII H and K emission
lines of variable intensity)
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Nomenclature Note:
Variable stars designated by <Cl* NGC 2632 KP NNNNNN> in Simbad.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Jun-2010