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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 119 178 Optical, Near Infrared, and X-ray data for NGC 2362
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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- 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)
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-May-2008