J/AcA/66/31 NGC 3201 variable stars in NGC 3201 (Kaluzny+, 2016)
The Clusters AgeS Experiment (CASE).
Variable stars in the field of the globular cluster NGC 3201.
Kaluzny J., Rozyczka M., Thompson I.B., Narloch W., Mazur B., Pych W.,
Schwarzenberg-Czerny A.
<Acta Astron., 66, 31-53 (2016)>
=2016AcA....66...31K 2016AcA....66...31K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry
Keywords: globular clusters: individual: NGC 3201 - stars: variables: general -
stars: osscillations - blue stragglers - binaries: eclipsing
Abstract:
The field of the globular cluster NGC 3201 was monitored between 1998
and 2009 in a search for variable stars. BV light curves were obtained
for 152 periodic or likely periodic variables, fifty-seven of which
are new detections. Thirty-seven newly detected variables are proper
motion members of the cluster. Among them we found seven detached or
semi-detached eclipsing binaries, four contact binaries, and eight SX
Phe pulsators. Four of the eclipsing binaries are located in the
turnoff region, one on the lower main sequence and the remaining two
slightly above the subgiant branch. Two contact systems are blue
stragglers, and another two reside in the turnoff region. In the blue
straggler region a total of 266 objects were found, of which 140 are
proper motion (PM) members of NGC 3201, and another nineteen are field
stars. Seventy-eight of the remaining objects for which we do not have
PM data are located within the half-light radius from the center of
the cluster, and most of them are likely genuine blue stragglers. Four
variable objects in our field of view were found to coincide with
X-ray sources: three chromospherically active stars and a quasar at a
redshift z≈0.5.
Description:
Our paper is based on images acquired with the 1.0-m Swope telescope
using the 2048x3150 SITE3 camera. The field of view was
14.8x22.8arcmin2 at a scale of 0.435 arcsec/pixel. Observations were
conducted on 39 nights from January 5, 1998 to March 25, 2009. The
same set of filters was always used. For the analysis 975 V-band
images and 112 B-band images were selected. The seeing ranged from
1.2" to 3.6" and 1.2" to 2.1" for V and B, respectively, with median
values of 1.5" and 1.4".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 58 Basic data of NGC 3201 variables discovered
within the present survey
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See also:
V/150 : Updated catalog of variable stars in globular clusters (Clement+ 2017)
J/other/RMxAA/50.307 : RR Lyr light curves in NGC 3201 (Arellano Ferro+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Id Variable name (Vnnn or VNnn) (1)
6- 14 F9.5 deg RAdeg Right ascension (J2000)
16- 24 F9.5 deg DEdeg Declination (J2000)
26- 31 F6.3 mag Vmag V magnitude
33- 37 F5.3 mag B-V ?=- B-V colour index
39- 43 F5.3 mag DV Amplitude in V band
45- 55 F11.6 d Per ? Period
57 A1 --- n_Per Note on Per (2)
59- 64 A6 --- Type Type (3)
66 A1 --- Memb [YNU] Membership code (4)
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Note (1): We follow the naming convention of Clement et al. (2001, 2012,
2001AJ....122.2587C 2001AJ....122.2587C, Cat. V/150) continued by Arellano Ferro et al.
(2014RMxAA..50..307A 2014RMxAA..50..307A, Cat. J/other/RMxAA/50.307), whose last cataloged star
was V124. V119 is additionally listed as a system for which we provide
important new information. Stars VN1-VN22 are either not PM-members of
NGC 2301 or PM data are missing for them.
Note (2): Note on Per as follows:
1 = period taken from the unpublished PhD thesis of BM
2 = periodicity may be spurious
3 = irregular variations are also possible
4 = clear periodicity observed in May 2003 only
5 = period is the time-span between the first and the last observation
Note (3): Type as follows:
EA = detached eclipsing binary
EB = close eclipsing binary
EW = contact eclipsing binary,
SX = SX Phe-type pulsator
SP = spotted variable
LPV = long-period variable
? = roughly sinusoidal variations of unknown nature
BS = blue straggler
RG = red giant
Note (4): Membership code as follows:
Y = member
N = nonmember
U = no data or data ambiguous.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Oct-2019