J/AJ/130/1805 Hα emission stars in NGC 2362 (Dahm+, 2005)
The young cluster NGC 2362.
Dahm S.E.
<Astron. J., 130, 1805-1828 (2005)>
=2005AJ....130.1805D 2005AJ....130.1805D
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, Cousins ;
Equivalent widths ; Stars, emission
Keywords: accretion, accretion disks -
open clusters and associations: individual (NGC 2362) -
stars: formation - stars: pre-main-sequence
Abstract:
An Hα emission survey of the young cluster NGC 2362 resulted in
the detection of 130 Hα emission stars in an 11'x11' field
approximately centered on the fourth magnitude O9 Ib multiple star
τ CMa. The survey was carried out using the wide-field grism
spectrograph on the University of Hawaii 2.2m telescope and the Gemini
Multi-Object Spectrograph (GMOS) on Gemini North. Deep optical
VRCIC (to V∼23.0) and near-infrared (NIR) photometry (JHK) to K∼16
were obtained for several fields within the cluster. Spectra covering
the 6000-8000Å region at a resolution of R∼3000 (adequate for the
determination of LiIλ6708 line strengths) were also acquired
for ∼200 pre-main-sequence (PMS) candidates with GMOS.
Description:
The optical VRCIC images were obtained in 1999 October, 2000
December, and 2003 January at the f/10 focus of the UH 2.2m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 130 Hα emission stars in NGC 2362
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- D Number (Cl* NGC 2362 D NNN in Simbad)
5- 7 I3 --- IfAHa IHα number (IfAHA NNN in Simbad)
9 I1 h RAh Hour of Right Ascension (J2000) (1)
11- 12 I2 min RAm Minute of Right Ascension (J2000) (1)
14- 18 F5.2 s RAs Second of Right Ascension (J2000) (1)
20 A1 --- DE- Sign of the Declination (J2000) (1)
21- 22 I2 deg DEd Degree of Declination (J2000) (1)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000) (1)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
32- 36 F5.2 mag Vmag The V band magnitude (2)
38- 41 F4.2 mag V-Rc The (V-Rc) color (2)
43- 46 F4.2 mag V-Ic The (V-Ic) color (2)
48- 52 F5.2 mag Jmag ? The J band magnitude (3)
54- 57 F4.2 mag J-H ? The (J-H) color (3)
59- 62 F4.2 mag H-K ? The (H-K) color (3)
64- 67 A4 --- SpType Spectral type from GMOS data
69- 74 F6.2 0.1nm EW(Ha) Hα equivalent width in Angstroms (4)
75 A1 --- u_EW(Ha) Uncertainty flag on EW(Ha)
77- 80 F4.2 0.1nm EW(Li) ? The LiI equivalent width in Angstroms (5)
81- 82 A2 --- u_EW(Li) [:/::/NP/ ] Uncertainty flag on EW(Li) (6)
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Note (1): Astrometry from UH 2.2m optical images.
Note (2): Optical photometry from UH 2.2m.
Note (3): NIR photometry obtained using QUIRC on the UH 2.2m and the
2MASS Point Source Catalog (Cat. II/246).
Note (4): From WFGS (Wide-Field Grism Spectrograph) or GMOS (Gemini Multi-Object
Spectrograph) spectroscopy.
Note (5): From GMOS (Gemini Multi-Object Spectrograph) spectroscopy.
Note (6): Flag on EW(Li), with the following conventions:
: = uncertain;
:: = highly uncertain;
NP = Wavelength region was covered, but, the feature was not present in
the spectrum.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 02-Nov-2005