J/A+A/465/965 BI light curves of NGC 2506 variables (Arentoft+, 2007)
Oscillating blue stragglers, gamma Doradus stars and eclipsing binaries
in the open cluster NGC 2506.
Arentoft T., De Ridder J., Grundahl F., Glowienka L., Waelkens C.,
Dupret M.-A., Grigahcene A., Lefever K., Jensen H. R., Reyniers M.,
Frandsen S., Kjeldsen H.
<Astron. Astrophys. 465, 965 (2007)>
=2007A&A...465..965A 2007A&A...465..965A
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, CCD
Keywords: stars: blue stragglers - stars: variables: delta Sct, gamma Dor -
stars: binaries: eclipsing -
galaxies: open clusters and associations: individual: NGC 2506 -
techniques: photometric
Abstract:
We have obtained photometric time-series observations of stars in the
open cluster NGC 2506, in order to study pulsating blue stragglers and
eclipsing binaries. The data were obtained during a bi-site campaign
in early 2005 which involved the Danish 1.54-m telescope at ESO, La
Silla, and the Flemish Mercator telescope at La Palma, Spain. Based on
these data we increased the number of known variables in NGC 2506 from
5 to 28 through the detection of 3 new pulsating blue stragglers, 15
gamma Doradus stars and 4 new eclipsing binaries, while one variable
is of unknown type. We derived orbital periods for two previously
known binaries, we performed a tentative mode-identification of the
pulsating blue stragglers, and compared B- and I amplitude ratios and
phase differences for the gamma Doradus stars to seismic models.
Description:
Photometric B and I CCD time-series observations of variables in
NGC 2506. Not all variables are in the Mercator field, and in some
cases the photometry failed for typically bright stars on individual
images.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 100 28 Stellar parameters for the variables in NGC 2506
table1.dat 32 18898 La Silla B time-series
table2.dat 32 37048 La Silla I time-series
table3.dat 32 10240 La Palma B time-series
table4.dat 32 10299 La Palma I time-series
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- VName Variable name (V1-V28)
5 I1 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 23 I2 arcsec DEs Declination (J2000)
25- 30 F6.3 mag Vmag V magnitude
32- 36 F5.3 mag b-y b-y colour index
38- 42 F5.3 mag v-y ? v-y colour index
44- 48 F5.3 mag m1 ? m1 colour index
50- 54 F5.3 mag c1 ? c1 colour index
56- 60 F5.3 mag (b-y)0 ? (b-y)0 colour index
62- 66 F5.3 mag c0 ? c0 colour index
68- 71 I4 K Teff ? Effective temperature
73- 77 F5.3 mag VMAG ? Absolute V magnitude
79- 83 F5.3 mag Mbol ? Bolometric magnitude
85- 90 F6.3 mag BC ? Bolomatric correction
92- 96 F5.3 [solLum] logL ? Luminosity
98-100 A3 --- Type Classification type (1)
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Note (1): Classification type as follows:
BS = oscillating blue straggler
DEB = detached eclipsing binary
EB = eclipsing binary (unspecified)
GD = gamma Doradus type
CB = contact binary
? = unknown
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- VName Variable name (V1-V28)
5- 20 F16.8 d HJD Heliocentric time
23- 30 F8.5 mag dmag I or B differential magnitude
32 A1 --- Band [IB] Band
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Acknowledgements:
Torben Arentoft, toar(at)phys.au.dk
(End) T. Arentoft [University of Aarhus, Denmark], P. Vannier [CDS] 26-Mar-2007