J/MNRAS/370/1979 JHKs photometry of T2Cs in globular clusters (Matsunaga+, 2006)
The period-luminosity relation for type II Cepheids in globular clusters.
Matsunaga N., Fukushi H., Nakada Y., Tanabe T., Feast M.W., Menzies J.W.,
Ita Y., Nishiyama S., Baba D., Naoi T., Nakaya H., Kawadu T., Ishihara A.,
Kato D.
<Mon. Not. R. Astron. Soc., 370, 1979-1990 (2006)>
=2006MNRAS.370.1979M 2006MNRAS.370.1979M
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, infrared
Keywords: stars: Population II - stars: variables: other -
globular clusters: general - infrared: stars
Abstract:
We report the result of our near-infrared observations (JHKs) for type
II Cepheids (including possible RV Tau stars) in galactic globular
clusters. We detected variations of 46 variables in 26 clusters (10
new discoveries in seven clusters) and present their light curves.
Their periods range from 1.2d to over 80d. They show a well-defined
period-luminosity relation at each wavelength. Two type II Cepheids in
NGC 6441 also obey the relation if we assume the horizontal branch
stars in NGC 6441 are as bright as those in metal-poor globular
clusters in spite of the high metallicity of the cluster.
Description:
Data for type II Cepheids (T2Cs) were obtained during our project to
observe variables of various types in globular clusters. We used the
Infrared Survey Facility (IRSF) 1.4-m telescope and the Simultaneous
3-Colour Imager for Unbiased Survey (SIRIUS) near-infrared camera
constructed by Nagoya University and the National Astronomical
Observatory of Japan, and sited at the Sutherland station of the South
African Astronomical Observatory. Images of a 7.7x7.7arcmin2 field
of view are obtained simultaneously in JHKs. The seeing size was
typically 1.5arcsec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 91 46 List of type II Cepheids in globular clusters
table3.dat 63 862 Light variation
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See also:
V/48 : A catalogue of field type II Cepheids (Harris, 1985)
J/AJ/114/341 : Type II Cepheids (Gonzalez+ 1997)
J/AJ/128/1748 : VR photometry of type II Cepheids. I (Schmidt+, 2004)
J/AJ/129/2007 : VR Photometry of type II Cepheids. II (Schmidt+, 2005)
J/AJ/130/832 : VR photometry of type II Cepheids. III (Schmidt+, 2005)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name of the variable (Cluster VNNN)
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 24 F4.1 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 34 I2 arcsec DEs Declination (J2000)
36- 42 F7.4 d Per Period
44- 52 F9.3 d T0 First date of phase zero after MJD 53000
(2003 December 27)
54- 58 F5.2 mag <Jmag> Mean J magnitude
60- 64 F5.2 mag <Hmag> Mean H magnitude
66- 70 F5.2 mag <Ksmag> Mean Ks magnitude
72- 75 F4.2 mag DHmag Amplitude in Hmag
77- 80 F4.2 mag DJmag Amplitude in Jmag
82- 85 F4.2 mag DKsmag Amplitude in Ksmag
87- 88 I2 --- Nobs Number of observation
89 A1 --- n_Nobs [*] * when some of the measurements were
unavailable
91 A1 --- new [n] n for newly discovered object
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name of the variable (Cluster VNNN)
15- 24 F10.4 d MJD Modified Julian date
26- 30 F5.3 --- Phase [0/1] Phase (zero for the maxima)
32- 36 F5.2 mag Jmag ?=99.99 J magnitude
38- 41 F4.2 mag e_Jmag ?=0.00 rms uncertainty on Jmag
43- 47 F5.2 mag Hmag ?=99.99 H magnitude
49- 52 F4.2 mag e_Hmag ?=0.00 rms uncertainty on Hmag
54- 58 F5.2 mag Ksmag ?=99.99 Ks magnitude
60- 63 F4.2 mag e_Ksmag ?=0.00 rms uncertainty on Ksmag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Nov-2006