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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 154 1059 FLWO-NTT Near-Infrared Catalog
See also: B/2mass : The 2MASS database (IPAC/UMass, 2000) Table 5: Summary of Near-Infrared Observations -------------------------------------------------------------------------------- Observatory Date Band Plate Scale Beam size Comments arcsec/pix arcsec -------------------------------------------------------------------------------- FLWO 1997 Dec 14 H 0.596 3.58 See also Lada et al. 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 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 -------------------------------------------------------------------------------- Notes: FLWO: Fred Lawrence Whipple Observatory, Smithsonian Astrophysical Observatory NTT: New Technology Telescope, European Southern Observatory Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
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)
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), Muench, Alves, Lada and Lada (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) 2 : Luhman et al (2000, cat. J/ApJ/540/1016) Sequence Number 3 : Lucas & Roche (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.
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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