J/ApJ/573/366 Infrared photometry of Trapezium cluster (Muench+, 2002)
The luminosity and mass function of the Trapezium cluster:
from B stars to the deuterium-burning limit.
Muench A.A., Lada E.A., Lada C.J., Alves J.
<Astrophys. J. 573, 366 (2002)>
=2002ApJ...573..366M 2002ApJ...573..366M
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, infrared
Keywords: infrared: stars - stars: low-mass, brown dwarfs -
open clusters and associations: individual (Trapezium) -
stars: luminosity function, mass function - stars: pre-main-sequence
Abstract:
We use the results of a new multiepoch, multiwavelength, near-infrared
census of the Trapezium cluster in Orion to construct and analyze the
structure of its infrared (K-band) luminosity function. Specifically,
we employ an improved set of model luminosity functions to derive this
cluster's underlying initial mass function (IMF) across the entire
range of mass from OB stars to substellar objects down to near the
deuterium-burning limit.
The observations were performed at FLWO (Fred Lawrence Whipple
Observatory, Smithsonian Astrophysical Observatory), and ESO-NTT
(European Southern Observatory, New Technology Telescope), between
Dec. 1997 and Marche 2000 (see the "Table 5" section below)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 153 1059 FLWO-NTT Near-Infrared Catalog
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See also:
B/2mass : The 2MASS database (IPAC/UMass, 2000)
Table 5: Summary of Near-Infrared Observations
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Observatory Date Band Plate Scale Beam size Comments
arcsec/pix arcsec
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FLWO 1997 Dec 14 H 0.596 3.58 See also Lada et al.
2000AJ....120.3162L 2000AJ....120.3162L
FLWO 1997 Dec 14 K 0.596 3.58
FLWO 1997 Dec 15 H 0.596 3.58
FLWO 1997 Dec 15 K 0.596 3.58
FLWO 1997 Dec 16 J 0.596 3.58
FLWO 1998 Nov 04 J 0.596 3.58 See also Lada et al.
2000AJ....120.3162L 2000AJ....120.3162L
FLWO 1998 Nov 04 H 0.596 3.58
FLWO 1998 Nov 04 L 0.596 3.58
NTT 2000 Mar 14 Ks 0.288 1.73 See also Muench et al.
2001pJ...558L..51M
NTT 2000 Mar 14 H 0.288 1.73
NTT 2000 Mar 14 J 0.288 1.73
NTT 2000 Mar 14 Ks 0.288 1.73
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Notes: FLWO: Fred Lawrence Whipple Observatory, Smithsonian Astrophysical
Observatory
NTT: New Technology Telescope, European Southern Observatory
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- MLLA Sequential Running Number (1)
9 A1 --- m_MLLA [ABC] Unresolved System Component (2)
13 I1 h RAh Hour of Right Ascension (J2000) (3)
15- 16 I2 min RAm Minute of Right Ascension (J2000) (3)
18- 22 F5.2 s RAs Second of Right Ascension (J2000) (3)
25 A1 --- DE- Sign of the Declination (J2000) (3)
26 I1 deg DEd Degree of Declination (J2000) (3)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000) (3)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000) (3)
38- 42 F5.2 mag Jmag1 ?=99 FLWO J (1.25 micron) magnitude
44- 48 F5.2 mag Hmag1 ?=99 FLWO H (1.65 micron) magnitude
50- 54 F5.2 mag Kmag1 ?=99 FLWO K (2.20 micron) magnitude
56- 60 F5.2 mag Lmag1 ?=99 FLWO L (3.50 micron) magnitude
62- 66 F5.2 mag e_Jmag1 ?=-1 FLWO J magnitude error
68- 72 F5.2 mag e_Hmag1 ?=-1 FLWO H magnitude error
74- 78 F5.2 mag e_Kmag1 ?=-1 FLWO K magnitude error
80- 84 F5.2 mag e_Lmag1 ?=-1 FLWO L magnitude error
88- 92 F5.2 mag Jmag2 ?=99 NTT J (1.25 micron) magnitude
94- 98 F5.2 mag Hmag2 ?=99 NTT H (1.65 micron) magnitude
100-104 F5.2 mag Ksmag2 ?=99 NTT Ks (2.16 micron) magnitude
106-110 F5.2 mag e_Jmag2 ?=-1 NTT J magnitude error
112-116 F5.2 mag e_Hmag2 ?=-1 NTT H magnitude error
118-122 F5.2 mag e_Ksmag2 ?=-1 NTT Ks magnitude error
124-125 I2 --- phFlag Photometry Flag (4)
127-130 I4 --- [H97b] ? Optical identification (5)
131 A1 --- m_[H97b] Multiplicity index in [H97b] (5)
133-135 I3 --- [HC2000] ? Infrared identification (6)
137-154 A18 --- Name Alternative identification (7)
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Note (1): According to the IAU naming format:
Acronym + Sequence + (Specifier).
For this catalog we chose the acronym 'MLLA'
Note (2): The (Specifier) is chosen to designate system components
unresolved in the FLWO-NTT catalog. If they were resolved in other
catalogs and their coordinates could be placed on the 2MASS/ACT
astrometric system (See note 3), their equatorial positions were
included.
Note (3): Coordinates derived from an astrometric solution to the 2MASS
coordinate system as of the 2nd Incremental Point Source Catalog.
The 2MASS coordinates system is aligned to the ACT catalog.
Note (4): Photometry Flag indicating morphological or environmental
characteristics of the identified source that may limit the precision
of the quoted photometry, e.g, presence of diffraction spikes,
nebulous shapes, etc.
0 : No Flag
1 : Source is saturated in all FLWO-NTT images. Photometry taken from
the Hillenbrand et al, (1998, Cat. J/AJ/116/1816) catalog and
is listed here to reference to the photometry used in the
analysis of this catalog by Lada et al. ( 2000AJ....120.3162L 2000AJ....120.3162L),
Muench, Alves, Lada and Lada (2001ApJ...558L..51M 2001ApJ...558L..51M),
and Muench, Lada, Lada, and Alves (2002, this paper).
2 : Source is known binary/multiple NOT resolved in the FLWO-NTT catalog.
3 : (Flag 1 + 2) Source(s) FLWO-NTT photometry is saturated and
source is a known unresolved multiple.
5 : Known source not detected in the formal FLWO-NTT catalog. In some
cases the source was later identified by visual inspection of
the images, and its FLWO-NTT photometry is listed for completeness.
7 : (Flag 2 + 5) Known binary companion not detected/unresolved in
FLWO-NTT images.
9 : Sources FLWO-NTT photometry likely corrupted by extreme
nebulosity or bright star PSF effects.
10 : Source is very nebulous based on PSF or presence of H2 knots in
other published images.
15 : (Flag 5 + 10) Source not detected in formal FLWO-NTT catalog and
which appears as a very nebulous source in the NTT images.
Note (5): Cross Reference to the Hillenbrand (1997, Cat. J/AJ/113/1733)
ONC Catalog
Note (6): Cross Reference to the Hillenbrand & Carpenter (2000,
Cat. J/ApJ/540/236) Keck Trapezium Catalog
Note (7): Other Cross References. These are identified by the code "(X)"
where X is:
1 : "TCC" Sequence number from McCaughrean & Stauffer (1994AJ....108.1382M 1994AJ....108.1382M)
2 : Luhman et al (2000, cat. J/ApJ/540/1016) Sequence Number
3 : Lucas & Roche (2000MNRAS.314..858L 2000MNRAS.314..858L) Coordinate Based Sequence Number
4 : 2MASS (2nd Incremental Catalog) Coordinate based Sequence Number
Designations 3 and 4 are listed only where needed to identify
sources that have no prior cross-reference or that were not
detected by the FLWO-NTT observations.
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History:
* 01-Oct-2002: From electronic version of the journal
* 21-Feb-2007 : MLLA 129B: position changed to 5 35 23.05 -5 25 00.2
by the CDS team (instead of 5 35 23.05 -5 24 00.2
in the original table).
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 01-Oct-2002