J/MNRAS/367/1441 UBV(RI)cJHK photometry of NGC 2401 (Baume+, 2006)
NGC 2401: a template of the young population of the Norma-Cygnus arm in the
Third Galactic Quadrant.
Baume G., Moitinho A., Vazquez R.A., Solivella G., Carraro G., Villanova S.
<Mon. Not. R. Astron. Soc., 367, 1441-1449 (2006)>
=2006MNRAS.367.1441B 2006MNRAS.367.1441B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared
Keywords: stars: emission-line, Be - stars: imaging -
stars: individual: LSS 440 -
stars: luminosity function, mass function -
Galaxy: open clusters and associations: individual: NGC 2401 -
Galaxy: structure
Abstract:
Based on a deep optical CCD (UBV(RI)_C) photometric survey and on the
Two-Micron All-Sky-Survey (2MASS, II/246) data we derived the main
parameters of the open cluster NGC 2401. We found this cluster is
placed at 6.3±0.5kpc (Vo-Mv=14.0±0.2) from the Sun and is 25Myr
old, what allows us to identify NGC 2401 as a member of the young
population belonging to the innermost side of the extension of the
Norma-Cygnus spiral-arm in the Third Galactic Quadrant. A
spectroscopic study of the emission star LSS 440 that lies in the
cluster area revealed it is a B0Ve star; however, we could not confirm
it is a cluster member. We also constructed the cluster luminosity
function (LF) down to V∼22 and the cluster initial mass function (IMF)
for all stars with masses above M∼1-2M☉. It was found that the
slope of the cluster IMF is x∼1.8±0.2. The presence of a probable
PMS star population associated to the cluster is weakly revealed.
Description:
Our photometric data set comes from CCD photometric observations
carried out in the course of two runs on different telescopes:
- The European Southern Observatory (ESO): CCD VI observations using
the EMMI read arm camera at the NTT in the photometric night of
December 9, 2002.
- The Cerro Tololo Inter-American Observatory (CTIO): UBV(RI)c CCD
data were acquired with the 0.9m telescope during an observing run in
January 1998.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 151 3261 Photometric catalogue of the NGC 2401 region
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/other/BASI/32.295 : CCD UBVRI phot. of 3 open clusters (Sujatha+, 2004)
J/A+A/417/961 : UBV(RI)c phot. of NGC 2580 & NGC 2588 (Baume+, 2004)
J/A+A/445/493 : UBV(RI)c phot. of NGC 2425 & NGC 2635 (Moitinho+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Identification number (this work)
6- 11 F6.1 arcsec Xpos X position in arcseconds from the center (1)
13- 18 F6.1 arcsec Ypos Y position in arcseconds from the center (1)
20- 21 I2 h RAh Right Ascension (J2000)
23- 24 I2 min RAm Right Ascension (J2000)
26- 29 F4.1 s RAs Right Ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 48 F6.3 mag Vmag ?=- Johnson V magnitude
50- 54 F5.3 mag e_Vmag ?=- Error in Vmag
56- 61 F6.3 mag B-V ?=- Johnson B-V color index
63- 67 F5.3 mag e_B-V ?=- Error in B-V
69- 74 F6.3 mag U-B ?=- Johnson U-B color index
76- 80 F5.3 mag e_U-B ?=- Error in U-B
82- 87 F6.3 mag V-Rc ?=- Johnson-Cousins V-Rc color index
89- 93 F5.3 mag e_V-Rc ?=- Error in V-Rc
95-100 F6.3 mag V-Ic ?=- Johnson-Cousins V-Ic color index
102-106 F5.3 mag e_V-Ic ?=- Error in V-Ic
108-113 F6.3 mag Kmag ?=- 2MASS K magnitude
115-119 F5.3 mag e_Kmag ?=- Error in Kmag
121-126 F6.3 mag J-K ?=- 2MASS J-K color index
128-132 F5.3 mag e_J-K ?=- Error in J-K
134-139 F6.3 mag H-K ?=- 2MASS H-K color index
141-145 F5.3 mag e_H-K ?=- Error in H-K
147-148 A2 --- zone Zone where star is located (2)
150-151 A2 --- Memb Membership assignment (3)
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Note (1): Adopted center (J2000): RA = 07:29:25.2; DE = -13:57:54.0
Note (2): Zones as follows:
CA = cluster area
CF = comparison field
Note (3): Membership assignment as follows:
lm = likely member
pm = probable member
nm = non member
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Acknowledgements: Gustavo L. Baume, gbaume(at)fcaglp.fcaglp.unlp.edu.ar
Andre Moitinho, andre(at)oal.ul.pt
(End) Patricia Vannier [CDS] 09-Jun-2006