J/ApJ/773/54 Variable stars in and around NGC 2264 with BEST (Klagyivik+, 2013)
Variability survey in the CoRoT SRa01 field: implications of eclipsing binary
distribution on cluster formation in NGC 2264.
Klagyivik P., Csizmadia SZ., Pasternacki T., Fruth T., Erikson A.,
Cabrera J., Chini R., Eigmuller P., Kabath P., Kirste S., Lemke R.,
Murphy M., Rauer H., Titz-Weider R.
<Astrophys. J., 773, 54 (2013)>
=2013ApJ...773...54K 2013ApJ...773...54K
ADC_Keywords: Clusters, open; Stars, variable; YSOs; Binaries, eclipsing;
Photometry, infrared; Photometry, RI
Keywords: binaries: eclipsing;
open clusters and associations: individual: NGC 2264;
stars: formation; stars: pre-main sequence; stars: variables: general
Abstract:
Time-series photometry of the CoRoT field SRa01 was carried out with
the Berlin Exoplanet Search Telescope II in 2008/2009. A total of 1161
variable stars were detected, of which 241 were previously known and
920 are newly found. Several new, variable young stellar objects have
been discovered. The study of the spatial distribution of eclipsing
binaries revealed the higher relative frequency of Algols toward the
center of the young open cluster NGC 2264. In general Algol frequency
obeys an isotropic distribution of their angular momentum vectors,
except inside the cluster, where a specific orientation of the
inclinations is the case. We suggest that we see the orbital plane of
the binaries almost edge-on.
Description:
The observations were performed with the Berlin Exoplanet Search
Telescope II (BEST II) telescope located at the Observatorio Cerro
Armazones, Chile. BEST II observed the CoRoT target field SRa01 during
a total of 50 nights between 2008 December 6 and 2009 February 10.
The telescope is not equipped with any filter but the bandwidth
corresponds approximately to a wide R-bandpass filter.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 154 1161 Catalog of variable stars detected in CoRoT
field SRa01, sorted by internal BEST II identifiers
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/MNRAS/430/1433 : NGC 2264 members periods with CoRoT (Affer+, 2013)
J/AJ/143/140 : Periodic variables in CoRoT LRa02 field. II. (Fruth+, 2012)
J/AJ/142/114 : A variable star census in a Perseus field (Pasternacki+, 2011)
J/ApJ/741/35 : NIR photometry and polarization in NGC 2264 (Kwon+, 2011)
J/AJ/140/2025 : KH 15D (V582 Mon) VI light curves (Herbst+, 2010)
J/A+A/506/569 : BEST periodic variables in CoRoT LRa02 field (Kabath+, 2009)
J/AJ/137/3911 : BEST periodic variable stars in LRc2 field (Kabath+, 2009)
J/AJ/136/654 : BEST periodic variable stars in LRa1 field (Kabath+, 2008)
J/AJ/134/1560 : BEST periodic variable stars in IR01 field (Kabath+, 2007)
J/AJ/134/999 : X-ray observations of NGC 2264 (Dahm+, 2007)
J/AJ/134/766 : BEST variable stars in LRc1 field (Karoff+, 2007)
J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)
J/ApJ/648/1090 : Radial velocities of NGC 2264 stars (Furesz+, 2006)
J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006)
J/A+A/430/1005 : VRIHα photometry of NGC 2264 variables (Lamm+, 2005)
J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)
J/AJ/128/1684 : NGC 2264: VRIHα photometry (Sung+, 2004)
J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004)
J/AJ/127/2228 : VRI photometry of PMS stars in NGC 2264 OB (Makidon+, 2004)
J/A+A/417/557 : Rotation + variability of PMS Stars in NGC 2264 (Lamm, 2004)
J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000)
J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999)
J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997)
http://www.aavso.org/vsx/ : The International Variable Star Index home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- BEST BEST II identifier (1)
14- 15 A2 --- n_BEST [kc] Note: k=known, c=star affected by crowding
17- 32 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) if any
34- 35 I2 h RAh [6] Hour of Right Ascension (J2000)
37- 38 I2 min RAm Minute of Right Ascension (J2000)
40- 43 F4.1 s RAs Second of Right Ascension (J2000)
45 A1 --- DE- [+] Sign of Declination (J2000)
46- 47 I2 deg DEd [7/10] Degree of Declination (J2000)
49- 50 I2 arcmin DEm Arcminute of Declination (J2000)
52- 55 F4.1 arcsec DEs Arcsecond of Declination (J2000)
57- 61 F5.2 mag RBmag [11.1/19.1] BEST II photometric system
RB magnitude (∼wide R-bandpass filter)
63- 67 F5.2 mag Jmag ? 2MASS J band magnitude
69- 73 F5.2 mag Hmag ? 2MASS H band magnitude
75- 79 F5.2 mag Kmag [4.9/16]? 2MASS Ks band magnitude
81- 86 F6.3 d T0 ? Reduced Julian Date epoch of first minimum
(JD-2454800)
88- 96 F9.6 d Per [0.03/29]? Period
98-105 F8.6 d e_Per [0.000001/7]? Uncertainty in Per
107-111 F5.3 mag Amp [0.006/2.5]? Amplitude of variability
113-117 F5.3 mag e_Amp ? Uncertainty in Amp
119-125 A7 --- Type Variable type (2)
127-154 A28 --- OName Other name from VSX or GCVS
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Note (1): Stars are <[KCP2013] SRa01{a/b} NNNNN> in Simbad.
Note (2): The classification of the newly discovered periodic variable stars
was based on the shape, period and amplitude of their variability
according to a simplified scheme based on the General Catalogue of
Variable Stars (GCVS; Samus et al. 2009, B/gcvs) as follows:
DSCT = pulsating variable of Delta Scuti type (72 stars)
GDOR = pulsating variable of γ Doradus type (55 stars)
DCEP = pulsating variable of Cepheid type (18 stars)
RR = pulsating variable of RR Lyrae type (30 stars)
SXPHE = pulsating variable of SX Phoenicis type (3 stars)
EA = Eclipsing binary of Algol type (114 stars)
EW = Eclipsing binary of W Ursae Majoris type (42 stars)
EB = Eclipsing binary of Beta Lyrae type (19 stars)
E = Eclipsing binary system (12 stars)
ELL = Ellipsoidal variable (stars having sinusoidal-like light curves;
186 stars)
SP = Spotted star (light curves that exhibit typical features of starspots)
BY = BY Draconis-type star (3 stars)
YSO = Young stellar object (216 stars). Since NGC 2264 is a young open
cluster, there are many periodic pre-main sequence stars.
LPV = Long periodic variable (stars that vary on time scales longer than the
observational baseline; 23 sources). These stars need further
observations to determine their accurate period or to demonstrate
their non-periodic behavior.
MISC = non-periodic variable (298 stars; most of these stars are likely
non-periodic pre-main sequence stars.)
EW/DSCT = questionable or mixed EW / DSCT (28 stars)
ELL/SP = questionable or mixed ELL / SP (42 stars)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Feb-2015