J/A+A/372/173 ISOCAM observations of the rho Ophiuchi cloud (Bontemps+, 2001)
ISOCAM observations of the rho Ophiuchi cloud:
Luminosity and mass functions of the pre-main sequence embedded cluster.
Bontemps S., Andre P., Kaas A.A., Nordh L., Olofsson G., Huldtgren M.,
Abergel A., Blommaert J., Boulanger F., Burgdorf M., Cesarsky C.J.,
Cesarsky D., Copet E., Davies J., Falgarone E., Lagache G., Montmerle T.,
Perault M., Persi P., Prusti T., Puget J.L., Sibille F.
<Astron. Astrophys. 372, 173 (2001)>
=2001A&A...372..173B 2001A&A...372..173B
ADC_Keywords: Infrared sources ; YSOs ; Photometry, infrared
Mission_Name: ISO
Keywords: stars: formation - stars: low-mass, brown dwarfs -
stars: luminosity function, mass function - stars: pre-main sequence -
ISM: individual objects: rho Ophiuchi cloud
Description:
File table1 contains the list of the 212 ISOCAM sources recognized as
members of the rho Ophiuchi embedded cluster. It lists their J2000
coordinates, flux densities at 6.7 and 14.3 micron and associated rms
uncertainties, as well as the corresponding near-infrared
identifications and the adopted IR classes (Class I, II or III).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 212 List of the 212 ISOCAM sources.
table2.dat 35 16 Class I YSOs
table3.dat 54 123 Class II YSOs
table4.dat 52 38 Class III YSOs
table5.dat 51 39 Class III candidates located within the
CS contours of Fig. 1
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See also:
J/A+A/359/113 : X-ray and IR study of rho Oph dark cloud (Grosso+, 2000)
J/ApJS/112/109 : rho Oph Near IR Positions and Photometry (Barsony+, 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ISO ISO number in the list
4 A1 --- n_ISO *[ *abc] Notes on individual sources
6- 7 I2 h RAh Right ascension (J2000.0) (1)
9- 10 I2 min RAm Right ascension (J2000.0)
12- 15 F4.1 s RAs Right ascension (J2000.0)
17 A1 --- DE- Declination sign
18- 19 I2 deg DEd Declination (J2000.0)
21- 22 I2 arcmin DEm Declination (J2000.0)
24- 25 I2 arcsec DEs Declination (J2000.0)
27- 32 F6.3 Jy F6.7um ?=99.999 Flux density at 6.7 micron
34- 38 F5.3 Jy e_F6.7um ?=9.999 rms uncertainty on F6.7um (2)
40- 45 F6.3 Jy F14.3um ?=99.999 Flux density at 14.3 micron
47- 51 F5.3 Jy e_F14.3um ?=9.999 rms uncertainty on F14.3um (2)
53- 69 A17 --- Ident Near-IR identification or adopted name (3)
71- 74 A4 --- Class SED Class of the source (4)
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Note on n_ISO:
(*) Completely new IR sources with respect to published surveys.
(a) ISO#16 = SR3, ISO#48 = S1, ISO#90 = WL22 , and ISO#92 = WL16 are
extended sources in the mid-IR range, most probably due to PAH-like
emission. No attempt has been made to estimate their integrated F6.7
and F14.3 fluxes.
No precise mid-IR position could be derived for ISO#48 = S1/GY70. The
quoted coordinates correspond to the near-IR position of Barsony et al.
(1997ApJS..112..109B 1997ApJS..112..109B).
(b) The position of ISO#53 is offset by ∼16arcsec to the south of the
near-IR source GY84. This large offset is most likely due to the
presence of extended, structured emission from the bright neighboring
source S1.
(c) ISO#88 = SR24 is a binary system (SR24S/GY167 and SR24N/GY168; e.g.
Greene et al. 1994ApJ...434..614G 1994ApJ...434..614G) which is not resolved in the ISOCAM
images.
Note (1): The absolute ISOCAM coordinates have been determined using the
Barsony et al. (1997ApJS..112..109B 1997ApJS..112..109B) database as a reference frame.
The resulting positional uncertainty is estimated to be ∼3arcsec (rms).
Note (2): The quoted rms uncertainties on F6.7 and F14.3 comprise the random
errors estimated from the temporal and spatial noises measured on the
data. They do not include the systematic errors due to absolute
calibration and aperture correction uncertainties. The maximum
systematic error is estimated to be less than ∼15%.
Note (3): For a more complete cross-identification of the rho Ophiuchi IR
sources, see, e.g., Table 1 of Andre & Montmerle (1994ApJ...420..837A 1994ApJ...420..837A)
and Table 3 of Barsony et al. (1997ApJS..112..109B 1997ApJS..112..109B).
The following abbreviations are used:
ISO: refers to the present survey. Twelve ISO sources are
completely new sources with respect to published IR surveys.
B: Barsony et al. (1997ApJS..112..109B 1997ApJS..112..109B).
CRBR: Comeron et al. (1993ApJ...416..185C 1993ApJ...416..185C)
DoAr: Dolidze & Arakelian (1959AZh....36..444D 1959AZh....36..444D)
EL: Elias (1978ApJ...224..453E 1978ApJ...224..453E)
GSS: Grasdalen, Strom & Strom (1973ApJ...184L..53G 1973ApJ...184L..53G)
GY: Greene & Young (1992ApJ...395..516G 1992ApJ...395..516G)
IRS: Wilking, Lada & Young (1989ApJ...340..823W 1989ApJ...340..823W)
LFAM: Leous et al. (1991ApJ...379..683L 1991ApJ...379..683L)
L1689-IRS: Greene et al. (1994ApJ...434..614G 1994ApJ...434..614G)
SR: Struve Rudkjobing (1949ApJ...109...92S 1949ApJ...109...92S)
SKS: Strom, Kepner & Strom (1995ApJ...438..813S 1995ApJ...438..813S)
VSSG: Vrba et al. (1975ApJ...197...77V 1975ApJ...197...77V)
WL: Wilking & Lada (1983ApJ...274..698W 1983ApJ...274..698W)
WSB: Wilking, Schwartz & Blackwell (1987AJ.....94..106W 1987AJ.....94..106W)
Note (4): Adopted SED classes for the ISOCAM sources (see text in Sect. 3).
``nI'' and ``nII'' indicate newly identified Class I and Class II YSOs;
a question mark indicates an uncertain classification.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ISO ISO number
5- 20 A16 --- Name Identification
21 A1 --- n_Name [c] Note on Name (1)
24- 28 F5.2 --- SpIndex Infrared spectral index 2-14
30- 35 F6.3 mag Lbol Bolometric magnitude (2)
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Note (1): c: Although ISO159=IRS48 and ISO167=IRS51 formally lie below
our practical Class I-Class II limit SpIndexIR2-14=0.55, they are
still considered as Class I YSOs here (cf. WLY89 and AM94).
Note (2): Mbol is estimated by integrating under the observed SED
from 1.2µm to 60µm or 100µm and extrapolating from 60µm or
100µm to 200µm with a spectral index of -1.0. For the 9 weak
sources (ISO 137, 99, 31, 65, 146, 21, 209, 54 and 133) without
reliable IRAS fluxes, Mbol is estimated using a typical
Lbol/Lcal(6.7-14.3µm) ratio of 9.8 (see Sect. 4.3).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ISO ? ISO number
5- 18 A14 --- Name Identification
19 A1 --- n_Name [deg] Note on Name (1)
21- 25 F5.2 --- SpIndex ? Infrared spectral index 2-14
27- 30 F4.1 mag JMAG ? Absolute J magnitude
31 A1 --- n_JMAG [b] Individual note (1)
33- 35 F3.1 mag HMAG ? Absolute H magnitude
37- 40 F4.1 mag AV ? Absorption in V band
42- 47 F6.3 solLum Lstar Star luminosity
48 A1 --- n_Lstar [cf] Individual note (1)
50- 54 F5.3 solLum Ldisk ? Disk luminosity
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Note (1): Individual notes:
b: the J-band flux of ISO127=GY245 is taken from Greene et al.
(1994ApJ...434..614G 1994ApJ...434..614G).
c: ISO77=GY152, ISO85=CRBR51, and the last 13 sources are not detected
in all near-IR bands, and no reliable MJ or MH can be
estimated. Lstar has been obtained using Eq. (8) (Sect. 4.2).
d: ISO204=L1689-IRS5 and ISO212=L1689-IRS7 refer to the IR sources
listed by Greene et al. (1994ApJ...434..614G 1994ApJ...434..614G) in L1689.
e: ISO196=WSB60 corresponds to the source B162816-243657 in Barsony et
al. (1997ApJS..112..109B 1997ApJS..112..109B).
f: Since ISO90=WL22 and ISO92=WL16 are young early-type stars (see
Sect. 3.1), Lstar cannot be derived accurately using the method
described in Sect. 4.1. The quoted luminosities for WL22 and WL16
are taken from Wilking et al. (1989ApJ...340..823W 1989ApJ...340..823W) and Comeron et
al. (1993ApJ...416..185C 1993ApJ...416..185C), respectively.
They have been scaled to d=140pc.
g: The adopted names and the J2000 coordinates of the completely new
IR sources are given in Table 1.
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Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ISO ? ISO number
5- 18 A14 --- Name Identification
19 A1 --- n_Name [bd] Note on Name (1)
22- 26 F5.2 --- SpIndex ? Infrared spectral index 2-14
27 A1 --- u_SpIndex [)] Uncertainty flag on SpIndex
29- 31 F3.1 mag JMAG ? Absolute J magnitude
34- 37 F4.1 mag HMAG ? Absolute H magnitude
39- 42 F4.1 mag AV ? Absorption in V band
44- 51 F8.3 solLum Lstar ? Star luminosity
52 A1 --- n_Lstar [c] Note (1)
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Note (1): Notes:
b: Class III YSOs located inside the CS contours of Fig. 1
(see Sects. 3.5 and 4.4).
c: For the two B stars ISO16=SR3 and ISO48=S1 (e.g. Elias,
1978ApJ...224..453E 1978ApJ...224..453E), Lstar cannot be derived using the method
described in Sect. 4.1. The quoted values are taken from Lada &
Wilking (1984ApJ...287..610L 1984ApJ...287..610L), and have been scaled to d=140pc
d: AV and Lstar were not derived for these sources as they were
detected only in the K band by Barsony et al.
(1997ApJS..112..109B 1997ApJS..112..109B).
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Acknowledgements: Sylvain Bontemps
History:
* 25-Jul-2001: tables 2, 3, 4 and 5 added from electronic version.
(End) Patricia Bauer [CDS] 10-Apr-2001