J/A+A/357/219 ISOCAM observations in Cha I. (Persi+, 2000)
ISOCAM observations of the Chamaeleon I dark cloud
Persi P., Marenzi A.M., Olofsson G., Kaas A.A., Nordh L., Huldtgren M.,
Abergel A., Andre Philippe M., Bontemps S., Boulanger F., Burgdorf M.,
Casali M.M., Cesarsky C., Copet E., Davies J.I., Falgarone E., Montmerle T.,
Perault M., Prusti T., Puget J.L., Sibille F.
<Astron. Astrophys. 357, 219 (2000)>
=2000A&A...357..219P 2000A&A...357..219P
ADC_Keywords: Molecular clouds ; Photometry, infrared ; Stars, pre-main sequence
Mission_Name: ISO
Keywords: stars: formation - stars: low-mass, brown dwarfs -
stars: luminosity function, mass function - stars: pre-main sequence -
infrared: stars
Abstract:
We present the results of an ISOCAM survey of the Chamaeleon I dark
cloud conducted in two broad-band filters at 6.7 and 14.3µm. In an
area of 0.59deg2. we have detected a total of 282 mid-IR sources
with 103 sources observed in both filters. Combining the ISOCAM
observations with the I, J, and Ks data obtained with DENIS, we have
found 108 pre-main-sequence (PMS) stars in the region, of which 34
were previously unidentified. Several of these newly discovered young
stellar objects are relatively faint suggesting a population in Cha I
of very low mass objects that probably includes brown dwarfs in their
early contraction phases. Finally, most of the PMS stars show the
spectral index computed between 2.2 and 14.3µm typical of Class II
sources. The luminosity function (LF)
derived for our detected PMS stars is discussed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 48 List of known members in Cha I with IR excess
table2.dat 70 34 Positions and photometry of the new members in
Cha I with IR excess
table3.dat 57 62 Physical parameters of the identified ChaI
cloud members
table4.dat 50 34 Physical parameters of new Cha I cloud members
tables.tex 279 243 LaTeX version of the tables
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See also:
J/A+A/350/883 : R CrA ISOCAM observations (Olofsson+, 1999)
J/AJ/121/974 : JHK photometry in Cha I (Gomez+, 2001)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Name ISO Name
4 A1 --- n_Name [*+] *: ISOCAM-DENIS identification uncertainty
+: New YSOs candidates proposed by
Cambresy et al. (1998A&A...338..977C 1998A&A...338..977C)
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 15 F4.1 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 25 I2 arcsec DEs Declination (J2000)
27- 31 F5.2 mag Imag ? I magnitude
33- 37 F5.2 mag Jmag ? J magnitude
39- 43 F5.2 mag Ksmag ? Ks magnitude
45- 50 F6.1 mJy F6.7um Flux at 6.7um
52- 55 F4.1 mJy e_F6.7um rms uncertainty on F6.7um
57- 63 F7.1 mJy F14.3um ? Flux at 14.3um
65- 69 F5.1 mJy e_F14.3um ? rms uncertainty on F14.3um
71- 84 A14 --- ID Identification (only in table1)
86- 87 I2 --- r_ID ? Reference for ID (1)
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Note (1): References for identifications in table1:
1: Gauvin & Strom (1992ApJ...385..217G 1992ApJ...385..217G)
2: Lawson et al. (1996MNRAS.280.1071L 1996MNRAS.280.1071L)
3: Huenemoerder et al. (1994MNRAS.271..967H 1994MNRAS.271..967H)
4: Prusti et al. (1991MNRAS.251..303P 1991MNRAS.251..303P)
5: Comeron et al. (1999A&A...343..477C 1999A&A...343..477C)
6: Alcala (1994, Ph. D. Thesis. Ruprecht-Karls-Universitat, Heidelberg);
7: Hartigan (1993AJ....105.1511H 1993AJ....105.1511H)
8: Jones et al. (1985AJ.....90.1191J 1985AJ.....90.1191J)
9: Persi et al. (1999AJ....117..439P 1999AJ....117..439P)
10: Baud et al. (1984ApJ...278L..53B 1984ApJ...278L..53B)
11: Schwartz (1991, in Reipurth B. (ed.) Scientific Report No. 11.
ESO, p. 93)
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Name ISO Name
5- 7 F3.1 mag A(J) ? Absorption in J band
9- 12 F4.2 solLum Lum Star luminosity
14- 17 F4.1 --- alpha(IR) ? IR spectral index
19- 22 A4 --- SpType Spectral type (table3 only)
24- 38 A15 --- ID Identification (table3 only)
40- 57 A18 --- IRclass IR class
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Acknowledgements: Paolo Persi
Historical note:
* 27-Mar-2000: preparation
* 05-Sep-2000: In table3.dat, Object 46, HH 8 corrected into HH 48.
(End) Patricia Bauer [CDS] 27-Mar-2000