J/A+A/420/945 L1551 ISOCAM observations (Galfalk+, 2004)
ISOCAM observations of the L1551 star formation region.
Galfalk M., Olofsson G., Kaas A.A., Olofsson S., Bontemps S., Nordh L.,
Abergel A., Andre P., Boulanger F., Burgdorf M., Casali M.M., Cesarsky C.J.,
Davies J., Falgarone E., Montmerle T., Perault M., Persi P., Prusti T.,
Puget J.L., Sibille F.
<Astron. Astrophys. 420, 945 (2004)>
=2004A&A...420..945G 2004A&A...420..945G
ADC_Keywords: Infrared sources ; Stars, pre-main sequence ; Stars, late-type ;
Photometry, infrared
Keywords: stars: formation - stars: low-mass, brown dwarfs -
stars: pre-main sequence - stars: late-type - infrared: stars
Abstract:
The results of a deep mid-IR ISOCAM survey of the L1551 dark molecular
cloud are presented. The aim of this survey is a search for new YSO
(Young Stellar Object) candidates, using two broad-band filters
centred at 6.7 and 14.3µm. Although two regions close to the centre
of L1551 had to be avoided due to saturation problems, 96 sources were
detected in total (76 sources at 6.7µm and 44 sources at
14.3µm). Using the 24 sources detected in both filters, 14 were
found to have intrinsic mid-IR excess at 14.3µm and were therefore
classified as YSO candidates. Using additional observations in B, V,
I, J, H and K obtained from the ground, most candidates detected at
these wavelengths were confirmed to have mid-IR excess at 6.7µm as
well, and three additional YSO candidates were found.
Description:
Six regions (total area 0.122sq.deg.) were observed 26 27 September
1997 with ISOCAM, avoiding the mid-IR bright regions around IRS 5/NE
and HL/XZ Tau due to saturation problems.
The B, V, and I observations were carried out on 1 and 3 December 2001
using the ALFOSC instrument (Andalucia Faint Object Spectrograph and
Camera) mounted on the 2.56m NOT telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 118 102 All ISOCAM sources in L1551 with additional
optical, near-IR photometry and source comments
table2.tex 159 177 LaTeX version of table2
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See also:
J/A+A/350/883 : R CrA ISOCAM observations (Olofsson+, 1999)
J/A+A/357/219 : Cha I ISOCAM observations (Persi+, 2000)
J/A+A/372/173 : rho Ophiuchi cloud ISOCAM observations (Bontemps+, 2001)
J/A+A/318/879 : IR photometry of L1551/IRS5 (Men'shchikov+ 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq ISOCAM (L1551) source number
3 A1 --- n_Seq [)] ) indicates YSO candidates based on mid-IR
excess emission in the ISOCAM
m(6.7)-m(14.3) index
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 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 mJy S6.7um ? Flux at 6.7 micron
32 A1 --- u_S6.7um Uncertainty flag on S6.7um
34- 38 F5.2 mJy S14.3um ? Flux at 14.3 micron
39 A1 --- u_S14.3um Uncertainty flag on S14.3um
41- 45 F5.2 mag Bmag ? B magnitude
46 A1 --- n_Bmag [d] d: USNO A-2 catalogue has been used
48- 52 F5.2 mag Vmag ? V magnitude
53 A1 --- n_Vmag [:os] : for uncertainty,
o for out and s for saturated
55- 58 F4.1 mag Rmag ? R magnitude
60- 64 F5.2 mag Imag ? I magnitude
65 A1 --- n_Imag [os] o for out and s for saturated
67- 71 F5.2 mag Jmag ? J magnitude
74- 78 F5.2 mag Hmag ? H magnitude
81- 85 F5.2 mag Ksmag ? Ks magnitude
86 A1 --- n_Ksmag [e] e: K-band magnitude (ARNICA/NOT)
88- 92 F5.2 mag m(6.7) ? 6.7 micron magnitude
93 A1 --- u_m(6.7) Uncertainty flag on m(6.7)
95- 99 F5.2 mag m(14.3) ? 14.3 micron magnitude
100 A1 --- u_m(14.3) Uncertainty flag on m(14.3)
102-121 A20 --- Rem Remarks (1)
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Note (1): Notes and references:
a: Carkner et al., 1996ApJ...464..286C 1996ApJ...464..286C
b: Briceno et al., 1998AJ....115.2074B 1998AJ....115.2074B
c: Giovanardi et al., 2000ApJ...538..728G 2000ApJ...538..728G
Could be an extragalactic triple radio source
(Rodriguez & Canto 1983RMxAA...8..163R 1983RMxAA...8..163R)
f: XMM-Newton-15, Favata et al., 2003A&A...403..187F 2003A&A...403..187F
g: XMM-Newton-35
h: XMM-Newton-49
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Acknowledgements: Magnus Galfalk
(End) Patricia Bauer [CDS] 05-Apr-2004