J/AJ/139/2300 BVIc light curves of 3 type II Cepheids (Rabidoux+, 2010)
Light curves and period changes of type II Cepheids in the globular clusters
M3 and M5.
Rabidoux K., Smith H.A., Pritzl B.J., Osborn W., Kuehn C., Randall J.,
Lustig R., Wells K., Taylor L., De Lee N., Kinemuchi K., LaCluyze A.,
Hartley D., Greenwood C., Ingber M., Ireland M., Pellegrini E.,
Anderson M., Purdum G., Lacy J., Curtis M., Smolinski J., Danford S.
<Astron. J., 139, 2300-2307 (2010)>
=2010AJ....139.2300R 2010AJ....139.2300R
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, UBVRI
Keywords: globular clusters: individual (NGC 5272, NGC 5904) -
stars: variables: Cepheids
Abstract:
Light curves in the B, V, and Ic passbands have been obtained for the
type II Cepheids V154 in M3 and V42 and V84 in M5. Alternating cycle
behavior, similar to that seen among RV Tauri variables, is confirmed
for V84. Old and new observations, spanning more than a century, show
that V154 has increased in period while V42 has decreased in period.
V84, on the other hand, has shown large, erratic changes in period
that do not appear to reflect the long-term evolution of V84 through
the Hertzsprung-Russel diagram.
Description:
Images of M3 and M5 covering 10x10-arcmin were taken with the 0.6m
reflector on the campus of Michigan State University during 2003-2005
using an Apogee Ap47p CCD camera. Additional Michigan State University
observations were obtained of M5 in 2006 utilizing an Apogee Alta U47
CCD camera. Supplemental images were also obtained with two 0.4m
reflectors-in 2003 at the Brooks Astronomical Observatory of Central
Michigan University with a Photometrics Star-1 camera and in 2004 with
an SBIG ST-8 CCD on the Macalester College telescope.
Objects:
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RA (2000) DE Designation(s)
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13 42 11.73 +28 22 13.7 M3-V154 = Cl* NGC 5272 SAW V154
15 18 24.84 +02 02 53.4 M5-V42 = Cl* NGC 5904 SAW V42
15 18 36.15 +02 04 16.3 M5-V84 = Cl* NGC 5904 SAW V84
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 35 554 BVIc photometry of V154 in M3, V42 and V84 in M5
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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 A1 --- Filter [BVI] Photometry filter in the
Johnson-Cousins system
3- 6 A4 --- ID Identification number for the variable star
8- 18 F11.3 d HJD Heliocentric Julian Date of mid-exposure
20- 25 F6.3 mag mag Observed magnitude in Filter
27- 31 F5.3 mag e_mag Uncertainty in mag
33- 35 A3 --- Source Data source: MSU, MAC, or CMU
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 30-May-2012