J/AJ/112/618 CCD photometry of variable stars in M9 (Clement+, 1996)
The structure of the light curves of the RR Lyrae variables in the
Oosterhoff type II cluster M9.
Clement C.M., Shelton I.
<Astron. J., 112, 618-627 (1996)>
=1996AJ....112..618C 1996AJ....112..618C
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD
Keywords: globular clusters: M9 - stars: variables
Abstract:
CCD observations have been used to derive precise light curves for six
of the previously known RR Lyrae variables in the Oosterhoff type II
globular cluster M9 and to search for additional variables. Nine
variables have been discovered, eight of the RR Lyrae type. As a
result, the total number of RR Lyrae variables has been revised from 9
to 17 (9 RRc and 8 RRab), the mean period of the RRc stars has been
revised from 0.341d to 0.342d and that of the RRab stars from 0.621d
to 0.638d. Simon's method that relates physical properties of RRc
stars to the pulsation period and Fourier phase parameter φ31
has been used to determine the mass, luminosity, and temperature for
one of the RRc stars. Published observations of RR Lyrae stars in M15
have been used to test Simon's method (1993ApJ...410..526S 1993ApJ...410..526S, 1993,
IAUCo, 139, 315) and the results are promising. The formulae of
Jurcsik and Kovacs (1996A&A...312..111J 1996A&A...312..111J) for relating Fourier
parameters of RRab stars to [Fe/H] have been used to derive a metal
abundance for M9.
Description:
CCD time-series B photometry for 15 variable stars in the globular
cluster M9 observed with the University of Toronto 61cm Helen Sawyer
Hogg telescopoe at the Las Campanas Observatory in 1991.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 49 15 List of variables
table1.dat 101 91 CCD time-series B photometry for 15 variable
stars in Messier 9 (NGC 6333)
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See also:
J/AJ/89/1707 : M9 variable stars photographic observations (Clement+, 1984)
J/AJ/101/1352 : Observations of variable stars in M9 (Clement+, 1991)
J/AJ/118/453 : M9 RR Lyrae CCD observations (Clement+, 1999)
J/MNRAS/434/1220 : Vi light curves of NGC6333 variables (Arellano Ferro+, 2013)
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 (VNN),
<Cl* NGC 6333 SAW VNN> in Simbad
6- 7 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
9- 10 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
12- 16 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
18 A1 --- DE- Simbad Sign of the Declination (J2000.0)
19- 20 I2 deg DEd Simbad Degree of Declination (J2000.0)
22- 23 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
25- 28 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
30- 34 F5.2 mag Bmag Simbad B band magnitude
36- 39 F4.1 mag Vmag ? Simbad V band magnitude
41- 49 F9.7 d Per ? Period (from table2 of the paper)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian day
13- 17 F5.2 mag V2mag ?=- B magnitude of V2
19- 23 F5.2 mag V4mag ?=- B magnitude of V4
25- 29 F5.2 mag V5mag ?=- B magnitude of V5
31- 35 F5.2 mag V6mag ?=- B magnitude of V6
37- 41 F5.2 mag V7mag ?=- B magnitude of V7
43- 47 F5.2 mag V10mag ?=- B magnitude of V10
49- 53 F5.2 mag V11mag ?=- B magnitude of V11
55- 59 F5.2 mag V14mag ?=- B magnitude of V14
61- 65 F5.2 mag V15mag ?=- B magnitude of V15
67- 71 F5.2 mag V16mag ?=- B magnitude of V16
73- 77 F5.2 mag V17mag ?=- B magnitude of V17
79- 83 F5.2 mag V18mag ?=- B magnitude of V18
85- 89 F5.2 mag V19mag ?=- B magnitude of V19
91- 95 F5.2 mag V20mag ?=- B magnitude of V20
97-101 F5.2 mag V21mag ?=- B magnitude of V21
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Acknowledgements:
Daniel Bramich, ESO, Germany
Armando Arellano Ferro, Instituto de Astronomia, UNAM, Mexico
(End) Daniel Bramich [ESO], Patricia Vannier [CDS] 15-Oct-2013