J/AJ/147/155 BV photometry in and around 5 globular clusters (Jeon+, 2014)
B, V photometry for ∼19,000 stars in and around the Magellanic Cloud globular
clusters NGC 1466, NGC 1841, NGC 2210, NGC 2257, and Reticulum.
Jeon Y.-B., Nemec J.M., Walker A.R., Kunder A.M.
<Astron. J., 147, 155 (2014)>
=2014AJ....147..155J 2014AJ....147..155J
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Photometry, UBV
Keywords: galaxies: star clusters: general - Magellanic Clouds -
globular clusters: individual: (NGC 1466,NGC 1841,NGC 2210,NGC 2257,Reticulum)
Abstract:
Homogeneous B, V photometry is presented for 19324 stars in and around
5 Magellanic Cloud globular clusters: NGC 1466, NGC 1841, NGC 2210,
NGC 2257, and Reticulum. The photometry is derived from eight nights
of CCD imaging with the Cerro Tololo Inter-American Observatory 0.9m
SMARTS telescope. Instrumental magnitudes were transformed to the
Johnson B, V system using accurate calibration relations based on a
large sample of Landolt-Stetson equatorial standard stars, which were
observed on the same nights as the cluster stars. Residual analysis of
the equatorial standards used for the calibration, and validation of
the new photometry using Stetson's sample of secondary standards in
the vicinities of the five Large Magellanic Cloud clusters, shows
excellent agreement with our values in both magnitudes and colors.
Color-magnitude diagrams reaching to the main-sequence turnoffs at
V∼22mag, sigma-magnitude diagrams, and various other summaries are
presented for each cluster to illustrate the range and quality of the
new photometry. The photometry should prove useful for future studies
of the Magellanic Cloud globular clusters, particularly studies of
their variable stars.
Description:
On eight photometric nights in 2010 (Jan 16-18, Dec 2-6), CCD images
of the five cluster fields were taken with the 0.9m (36 inch)
telescope operated by the SMARTS Consortium at the CTIO. A Tek2K_3 CCD
imager, with Johnson B and V filters, was used for both the January
and December observations.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 84 1418 B, V photometry for 1418 stars in and around NGC 1466
table5.dat 84 2004 B, V Photometry for 2004 Stars in and around NGC 1841
table6.dat 84 13087 B, V Photometry for 13087 Stars in and around NGC 2210
table7.dat 84 2049 B, V Photometry for 2049 Stars in and around NGC 2257
table8.dat 84 766 B, V Photometry for 766 Stars in and around Reticulum
table11.dat 37 5 Physical parameters for fitting theoretical model on
the CMDs of the five globular clusters
--------------------------------------------------------------------------------
See also:
J/AJ/145/160 : Variables in LMC GCs. III. Reticulum (Kuehn+, 2013)
J/AJ/142/107 : Variable stars in NGC 1466 (Kuehn+, 2011)
J/AcA/60/165 : VI light curves of SMC RR Lyrae (Soszynski+, 2010)
J/AJ/138/1310 : Variable stars in NGC 2257. I. (Nemec+, 2009)
J/AcA/59/1 : VI light curves of LMC RR Lyrae stars (Soszynski+, 2009)
J/AJ/127/334 : MACHO LMC first-overtone RR Lyrae variables (Alcock+, 2004)
J/ApJ/542/257 : MACHO LMC first-overtone RR Lyrae (Alcock+, 2000)
J/ApJ/527/199 : HST observations of old clusters in the LMC (Johnson+, 1999)
J/AJ/112/2020 : UBV Photometry of globular cluster NGC1841 (Alcaino+ 1996)
J/AJ/98/2086 : CCD photometry of NGC 2257 RR Lyrae (Walker 1989)
Byte-by-byte Description of file: table[45678].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Star Star number
6 A1 --- f_Star [vwxyz] Known, suspected, or newly discovered
variable star (1)
8 I1 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000)
31- 37 F7.2 pix Xpos X pixel coordinate (2)
39- 45 F7.2 pix Ypos Y pixel coordinate (2)
47- 51 F5.1 arcsec r Distance from cluster center
53- 58 F6.3 mag Bmag [11.897/23.183] Johnson B band magnitude
60- 64 F5.3 mag e_Bmag Standard deviation in Bmag
66- 71 F6.3 mag Vmag [11.192/22.822] Johnson V band magnitude
73- 77 F5.3 mag e_Vmag Standard deviation in Vmag
79- 84 F6.3 mag <B-V> Mean Johnson (B-V) color index
--------------------------------------------------------------------------------
Note (1): Flags on Star are defined as follows:
v = 62 known or suspected variable stars (see Kuehn et al. 2011,
cat. J/AJ/142/107) in and around NGC 1466 (Table4);
w = 20 known or suspected variable stars (Walker, 1990AJ....100.1532W 1990AJ....100.1532W) and 8
newly discovered variable stars (Jeon et al. 2014, in preparation) in and
around NGC 1841 (Table5);
x = 89 known or suspected variable stars (from Jeon et al. 2014, in
preparation) in and around NGC 2210 (Table6);
y = 48 known or suspected variable stars (Nemec et al. 2009,
cat. J/AJ/138/1310) in and around NGC 2257 (Table7);
z = 32 known or suspected variable stars (see Kuehn et al. 2013,
cat. J/AJ/145/160) in and around Reticulum (Table8).
Note (2): On each frame, which are the offsets from the North-East corner of
the frame (+X is W, +Y is S).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table11.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Cluster Cluster name
11- 15 F5.2 [Sun] [Fe/H] [-2.11/-1.79] Metal abundance
17- 23 F7.5 --- Z [0.00025/0.0005] Metallicity
25- 28 F4.2 mag E(B-V) [0.03/0.18] Reddening
30- 34 F5.2 mag (m-M)0 [18.38/18.53] Distance modulus
36- 37 I2 Gyr Age [9/12] Age
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 08-Oct-2014