J/MNRAS/454/3597 NGC 2282 BVI Ha observations (Dutta+, 2015)
The young cluster NGC 2282: a multiwavelength perspective.
Dutta S., Mondal S., Jose J., Das R.K., Samal M.R., Ghosh S.
<Mon. Not. R. Astron. Soc., 454, 3597-3612 (2015)>
=2015MNRAS.454.3597D 2015MNRAS.454.3597D (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; YSOs ; Stars, pre-main sequence ;
Photometry, UBVRI
Keywords: stars: formation - stars: low-mass - stars: pre-main-sequence -
stars: variables: T Tauri, Herbig Ae/Be - HII region - stars: low-mass
Abstract:
We present the analysis of the stellar content of NGC 2282, a young
cluster in the Monoceros constellation, using deep optical BVI and INT
Photometric Hα Survey (IPHAS) photometry along with infrared
(IR) data from UKIRT Infrared Deep Sky Survey and Spitzer-IRAC. Based
on the stellar surface density analysis using nearest neighbourhood
method, the radius of the cluster is estimated as ∼3.15-arcmin. From
optical spectroscopic analysis of eight bright sources, we have
classified three early B-type members in the cluster, which includes,
HD 289120, a previously known B2V-type star, a Herbig Ae/Be star (B0.5
Ve) and a B5 V star. From spectrophotometric analyses, the distance to
the cluster has been estimated as ∼1.65kpc. The K-band extinction map
is estimated using nearest neighbourhood technique, and the mean
extinction within the cluster area is found to be AV∼3.9mag. Using
IR colour-colour criteria and Hα-emission properties, we have
identified a total of 152 candidate young stellar objects (YSOs) in
the region, of which, 75 are classified as Class II, nine are Class I
YSOs. Our YSO catalogue also includes 50 Hα-emission line
sources, identified using slitless spectroscopy and IPHAS photometry
data. Based on the optical and near-IR colour-magnitude diagram
analyses, the cluster age has been estimated to be in the range of
2-5Myr, which is in agreement with the estimated age from disc
fraction (∼58 per cent). Masses of these YSOs are found to be
∼0.1-2.0M☉. Spatial distribution of the candidate YSOs shows
spherical morphology, more or less similar to the surface density map.
Description:
The CCD BVI observations of the cluster were acquired using the 1.04-m
Sampurnanand telescope at Nainital, India during 2007 December 14.
The grism slitless spectroscopic observations were obtained to
identify Hα emission line stars using HFOSC of HCT on 2011
January 25 and 2013 November 08. The observations were carried out
using a combination of Grism 5 (5200-10300Å) or Grism 8
(5800-8350Å) and the Hα broad-band filter
(6300-6740Å).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 130 5601 Multi-wavelength catalog of NGC 2282
table3.dat 106 8 Details of the spectroscopically studied stars
table4.dat 139 179 Catalog of YSOs (Class I, Class II, other PMS
stars and Hα sources)
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See also:
J/AJ/113/1788 : Near-IR Imaging Survey of NGC 2282 (Horner+ 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number
6- 16 F11.7 deg RAdeg Right ascension (J2000)
18- 26 F9.7 deg DEdeg Declination (J2000)
28- 33 F6.3 mag Vmag ?=- ST Johnson V magnitude
35- 39 F5.3 mag e_Vmag ? rms uncertainty on Vmag
41- 46 F6.3 mag B-V ?=- ST Johnson B-V colour index
48- 52 F5.3 mag e_B-V ? rms uncertainty on B-V
54- 59 F6.3 mag V-I ?=- ST Johnson-Cousins V-I colour index
61- 65 F5.3 mag e_V-I ? rms uncertainty on V-I
67- 72 F6.3 mag Jmag ?=- UKIDSS J magnitude
74- 78 F5.3 mag e_Jmag ? rms uncertainty on Jmag
80- 85 F6.3 mag Hmag ?=- UKIDSS H magnitude
87- 91 F5.3 mag e_Hmag ? rms uncertainty on Hmag
93- 98 F6.3 mag Kmag ?=- UKIDSS K magnitude
100-104 F5.3 mag e_Kmag ? rms uncertainty on Kmag
106-111 F6.3 mag [3.6] ?=- IRAC 3.6µm magnitude
113-117 F5.3 mag e_[3.6] ? rms uncertainty on 3.6µm magnitude
119-124 F6.3 mag [4.5] ?=- IRAC 4.5µm magnitude
126-130 F5.3 mag e_[4.5] ? rms uncertainty on 4.5µm magnitude
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 I1 --- Seq Sequential number
3- 4 I2 h RAh Right ascension (J2000)
6- 7 I2 min RAm Right ascension (J2000)
9- 14 F6.3 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17 I1 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 27 F6.3 arcsec DEs Declination (J2000)
29- 34 F6.3 mag Vmag V magnitude
36- 40 F5.3 mag V-I V-I colour index
42- 45 F4.2 mag AVsp Spectroscopic absorption
47- 50 F4.2 mag e_AVsp rms uncertainty on AVsp
52- 56 F5.2 mag AVph ?=- Photometric absorption (1)
58- 61 F4.2 mag e_AVph ? rms uncertainty on AVsp
63- 67 F5.2 mag MOD ?=- Distance modulus (2)
69- 72 F4.2 mag e_MOD ? rms uncertainty on MOD
74- 77 I4 pc Dist ?=- Distance
79- 81 I3 pc e_Dist ? rms uncertainty on Dist
83- 88 A6 --- SpType MK spectral type
90-106 A17 --- Rem Remarks
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Note (1): Photometric AV's are calculated from extinction map.
Foreground stars have not considered here.
Note (2): Distance moduli refers to the intrinsic distance moduli obtained from
near-IR apparent distance moduli.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Code Code for object type (1)
5- 8 I4 --- Seq Sequential number
10- 20 F11.7 deg RAdeg Right ascension (J2000)
22- 30 F9.7 deg DEdeg Declination (J2000)
32- 37 F6.3 mag Vmag ?=- ST Johnson V magnitude
39- 43 F5.3 mag e_Vmag ? rms uncertainty on Vmag
45- 49 F5.3 mag B-V ?=- ST Johnson B-V colour index
51- 55 F5.3 mag e_B-V ? rms uncertainty on B-V
57- 61 F5.3 mag V-I ?=- ST Johnson-Cousins V-I colour index
63- 67 F5.3 mag e_V-I ? rms uncertainty on V-I
69- 74 F6.3 mag Jmag ?=- UKIDSS J magnitude
76- 80 F5.3 mag e_Jmag ? rms uncertainty on Jmag
82- 87 F6.3 mag Hmag ?=- UKIDSS H magnitude
89- 94 F6.4 mag e_Hmag ? rms uncertainty on Hmag
96-102 F7.4 mag Kmag ?=- UKIDSS K magnitude
103-108 F6.4 mag e_Kmag ? rms uncertainty on Kmag
110-115 F6.3 mag [3.6] ?=- IRAC 3.6µm magnitude
117-122 F6.4 mag e_[3.6] ? rms uncertainty on 3.6µm magnitude
124-129 F6.3 mag [4.5] ?=- IRAC 4.5µm magnitude
131-135 F5.3 mag e_[4.5] ? rms uncertainty on 4.5µm magnitude
137-139 A3 --- Ha [YES/NO ] Hα emission?
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Note (1): Code as follows:
I = Class I
II = Class II
O = Other YSOs selected from JHK
A = Hα emission sources detected from both slitless spectroscopy
and IPHAS photometry
DS = Hα emission sources detected from slitless spectroscopy only
DI = Detected from IPHAS photometry only
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Jul-2016