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. =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, ) 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_{sun}_. 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 151 3261 Photometric catalogue of the NGC 2401 region -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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