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J/ApJ/646/269       Multiwavelength analysis of NGC 2362     (Delgado+, 2006)

Multiwavelength analysis of the young open cluster NGC 2362. Delgado A.J., Gonzalez-Martin O., Alfaro E.J., Yun J. <Astrophys. J., 646, 269-274 (2006)> =2006ApJ...646..269D
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Equivalent widths Keywords: open clusters and associations: individual (NGC 2362) - stars: pre-main-sequence Abstract: We present a multi-wavelength analysis of the young open cluster NGC 2362; UBVRcIc CCD photometric observations, together with available data in the Chandra database, near-infrared data from the Two Micron All Sky Survey (2MASS), and recently published Hα spectroscopy were used to get information about the evolutionary stage of the cluster and the main physical properties of its stellar content. Cluster membership is estimated for every individual star by means of zero-age main sequence (ZAMS) and isochrone fitting. The cluster is confirmed to host a rich population of pre-main-sequence (PMS) objects and to contain a large number of X-ray-emitting stars, which reach from the PMS members of GK spectral type up to the most luminous OB main-sequence (MS) members. The PMS cluster members show no significant age spread, and the comparison to both PMS and post-MS isochrones suggests an homogeneous age for all cluster members. The analysis allows us to assess the validity of currently used PMS evolutionary models and supports the suggestion of a well-defined positive correlation of the X-ray emission from PMS stars with their bolometric luminosity. Clear differences are found between the X-ray activity properties of MS and PMS cluster members, both in the relation between X-ray luminosity and bolometric luminosity, and in spectral properties as well. Description: The optical observations were secured during two nights in 2000 December at the Cerro Tololo Inter-American Observatory with the YALO 1m telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 119 178 Optical, Near Infrared, and X-ray data for NGC 2362
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Star Star identification number, Cl* NGC 2362 DGA NNNN in Simbad 6 I1 --- Mm Membership identification (1) 8- 17 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 19- 28 F10.6 deg DEdeg Declination in decimal degrees (J2000) 30- 35 F6.3 mag Vmag The Johnson V band magnitude 37- 42 F6.3 mag U-B ? The Johnson (U-B) color index 44- 49 F6.3 mag B-V ? The Johnson (B-V) color index 51- 56 F6.3 mag V-Rc ? The Johnson-Cousins (V-Rc) color index 58- 63 F6.3 mag V-Ic ? The Johnson-Cousins (V-Ic) color index 65- 70 F6.3 mag d(H-K) ? The (H-K) increment with respect to the reddening line in the (J-H),(H-K) diagram 72- 77 F6.3 0.1nm EWHa ? Hα equivalent width in Angstroms 79- 83 F5.3 0.1nm EWLi ? Li I (6708Å) equivalent width in Angstroms 85- 94 E10.4 mW/m2 SFlux ? Soft (0.6-2keV) band flux (2) 96-105 E10.4 mW/m2 HFlux ? Hard (2-8keV) band flux (2) 107-112 F6.3 [10-7W] logLx ? Log of the X-ray luminosity (3) 114-119 F6.3 [10-7W] logLB Log of the bolometric luminosity (3)
Note (1): Membership identification as follows: 0 = no membership assignment 1 = main sequence 2 = pre-main sequence Note (2): In units of erg/s/cm2. Note (3): In units of erg/s.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-May-2008
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