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J/ApJ/540/1016   K-band & NICMOS photometry of Trapezium Cluster (Luhman+, 2000)

The initial mass function of low-mass stars and brown dwarfs in young clusters. Luhman K.L., Rieke G.H., Young E.T., Cotera A.S., Chen H., Rieke M.J., Schneider G., Thompson R.I. <Astrophys. J. 540, 1016 (2000)> =2000ApJ...540.1016L
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Infrared sources ; Magnitudes ; Spectra, infrared Mission_Name: HST Keywords: infrared: stars - stars: evolution - stars: formation - stars: low-mass, brown dwarfs - stars: luminosity function, mass function - stars: pre-main-sequence Abstract: We have obtained images of the Trapezium Cluster (140"x140"; 0.3pc x 0.3pc) with the Hubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Combining these data with new ground-based K-band spectra (R=800) and existing spectral types and photometry, we have constructed an H-R diagram and used it and other arguments to infer masses and ages. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 189 320 Data for the Trapezium Cluster
See also: I/134 : Trapezium Multiple Systems (Salukvadze, 1978) J/A+A/299/39 : Orion Trapezium area ROSAT PSPC obs. I. (Geier+, 1995) J/AN/321/81 : Orion Trapezium area ROSAT PSPC obs. II. (Lohmann+, 2000) J/AJ/117/1375 : Orion Trapezium cluster (Simon+, 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [LRY2000] Sequential number 4- 6 A3 --- n_[LRY2000] [ghijkl ] Individual notes (1) 8- 14 A7 --- TCC Designations of McCaughrean & Stauffer, 1994AJ....108.1382M 15- 18 I4 --- [H97b] ? Designations of Hillenbrand, 1997AJ....113.1733H 19 A1 --- m_[H97b] [ab] Multiplicity index on [H97b] 21- 22 I2 h RAh Right ascension (J2000) 24- 25 I2 min RAm Right ascension (J2000) 27- 32 F6.3 s RAs Right ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 45 F5.2 arcsec DEs Declination (J2000) 47- 95 A49 --- SpTypel Previous spectral type determinations (2) 97-123 A27 --- IRType IR type (3) 125-133 A9 --- SpType Adopted spectral type 135-139 I5 K Teff ? Effective temperature 141-144 F4.2 mag AH ? Absorption in H band 146-155 F10.3 solLum Lbol ? Bolometric luminosity 157 A1 --- l_V-I Limit flag on V-I 158-162 F5.2 mag V-I ? V-I colour index (2) 164-168 F5.2 mag Imag ? I magnitude (2) 170 A1 --- l_m100-m160 Limit flag on 100-160 171-175 F5.2 --- m100-m160 ? F100W(0.8-1.4um)-F160W(1.4-1.8um) colour index (4) 177-181 F5.2 mag m160mag ? F160W (1.4-1.8um) magnitude 183-187 F5.2 mag Kmag ? K magnitude from McCaughrean & Stauffer, 1994AJ....108.1382M
Note (1): Individual notes: g: Member of a binary system that is resolved in the optical measurements while unresolved in the IR photometry. h: The spectral type assigned to source 97 applies to the composite system of 97, 100, and 101. i: Within a diffraction spike. j: Hillenbrand, 1997AJ....113.1733H k: Optical measurement listed for TCC046 probably includes both TCC039 and TCC046. l: Optical measurement listed for TCC073 includes both TCC070 and TCC073. Note (2): References for spectral types: T: Trumpler, 1931PASP...43..255T Par: Parenago, 1954, Cat. II/171 J: Johnson, 1965ApJ...142..964J S: Strand, 1958ApJ...128...14S LA: Levato & Abt, 1976PASP...88..712L or Abt & Levato, 1977PASP...89..797A CK: Cohen & Kuhi, 1979ApJS...41..743C HT: Herbig & Terndrup, 1986ApJ...307..609H, and reference therein P: C. F. Prosser & J. R. Stauffer 1993, private communication vA: van Altena et al., 1988AJ.....95.1744V Eetal: Edwards et al., 1993AJ....106..372E Sam: Samuel 1993, Ph. D. thesis, Australian National Univ. Ham: Hamilton 1994, Masters thesis, Wesleyan University H: Hillenbrand, 1997AJ....113.1733H Hp: L. A. Hillenbrand 2000, private comm. (Hp). Note (3): The spectral type, K-band continuum veiling, and CO band head strength measured from the K-band spectra. The veiling at K is defined as r{K}=I2.2(IR excess)/I2.2(star), which is estimated from the spectra. The strength of the CO band head is given as a percentage increase in CO absorption over that of a dwarf of the same spectral type. Note (4): Blank entries indicate sources that are saturated or are too close to bright stars to be measured. The one exception is TCC003, which is not detected in the NICMOS data.
Table 2: Low-Mass Candidates in IC 348 -------------------------------------------------------------------------------- ID RA (J2000) DE R-I I J-H H-KS KS -------------------------------------------------------------------------------- 435 03 44 30.33 +32 11 33.9 1.45 18.95 1.20 0.85 14.24 603 03 44 33.43 +32 10 29.8 19.93 1.01 0.65 15.17 609 03 44 44.92 +32 09 34.7 21.20 0.99 0.36 16.89 618 03 44 43.92 +32 08 34.3 21.47 0.94 0.47 16.89 624 03 44 26.30 +32 08 08.7 21.83 1.01 0.67 16.43 -------------------------------------------------------------------------------- Note: The optical and IR photometry is from the work of Luhman 1999, Cat. J/ApJ/525/466 and Luhman et al. 1998ApJ...499..799L, respectively. History: * 27-Nov-2000: From ApJ electronic version * 05-Mar-2001: the designation "TCC" corrected for 2 entries of table1 (dot removed in TCC names for entries 98 and 99)
(End) James Marcout, Patricia Bauer [CDS] 27-Nov-2000
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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