J/A+A/500/1045 Cool stars and brown dwarfs in Lupus clouds (Comeron+, 2009)
A new population of cool stars and brown dwarfs in the Lupus clouds.
Comeron F., Spezzi L., Lopez Marti B.
<Astron. Astrophys., 500, 1045-1063 (2009)>
=2009A&A...500.1045C 2009A&A...500.1045C
ADC_Keywords: Molecular clouds; Stars, pre-main sequence; Photometry, infrared
Keywords: stars: low-mass, brown dwarfs - stars: formation -
stars: pre-main sequence - ISM: individual objects: Lupus -
ISM: clouds
Abstract:
Most studies of the stellar and substellar populations of star-forming
regions rely on using the signatures of accretion, outflows, disks, or
activity characterizing the early stages of stellar evolution.
However, these signatures rapidly decay with time.
We present the results of a wide-area study of the stellar population
of clouds in the Lupus star-forming region. When combined with 2MASS
photometry, our data allow us to fit the spectral energy distributions
of over 150000 sources and identify possible new members based on
their photospheric fluxes, independent of any display of the signposts
of youth.
Description:
We used the Wide Field Imager (WFI) at the La Silla 2.2m telescope to
image an area of more than 6 square degrees in the Lupus 1, 3 and 4
clouds in the Rc, Ic, and zWFI bands, selected so as to overlap with
the areas observed in the Spitzer Legacy Program "From molecular
cores to planet-forming disks". We complement our data with 2MASS
photometry to sample the spectral energy distribution from 0.6um to
2.2um.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 101 105 Derived physical parameters for known,
non-saturated members of Lupus 1, 3, and 4
table9.dat 122 143 New candidate members of Lupus 1, 3, and 4
notes.dat 80 65 Individual notes
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+A/454/595 : X-ray emission of T Tau stars in Lupus 3 (Gondoin, 2006)
J/A+AS/123/329 : New weak-line T Tauri stars in Lupus (Krautter+ 1997)
J/A+A/320/185 : UBVRIcJHKL photometry in Lup (Wichmann+ 1997)
J/MNRAS/331/474 : ubvyβ photometry in the Lupus dark cloud (Franco, 2002)
J/ApJ/658/480 : Pre-main-sequence stars in Lupus association (Makarov+, 2007)
J/ApJS/177/551 : Spitzer c2d survey XI. Lupus with IRAC and MIPS (Merin+ 2008)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [Lupus]
7 I1 --- Lup Lupus region (1, 3, or 4)
9- 23 A15 --- SSTc2dJ Object name (HHMMSS.s+DDMMSS, J2000)
25- 29 I5 K Teff Effective temperature
31- 37 F7.4 solLum L Estimated luminosity
39- 42 F4.1 mag AV Absorption in V band
44- 48 F5.3 solMass Mass ?=- Estimated stellar mass
51 A1 --- l_Age Limit flag on Age
52- 56 F5.1 Myr Age ? Estimated age
59- 68 A10 --- ONames Other name(s)
70- 71 A2 --- Mm Membership reference (1)
73- 80 A8 --- SpT MK spectral type
83- 87 A5 --- r_SpT Spectral type references (2)
89-101 A13 --- Notes Notes, in notes.dat file
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Note (1): Membership references as follows::
m1 = Schwartz, 1977ApJS...35..161S 1977ApJS...35..161S
m2 = Allers et al., 2006ApJ...644..364A 2006ApJ...644..364A
m3 = Merin et al., 2008, ApJ, submitted
m4 = Chapman et al., 2007ApJ...667..288C 2007ApJ...667..288C
m5 = Lopez Marti et al., 2005A&A...440..139L 2005A&A...440..139L
m6 = Allen et al., 2007ApJ...655.1095A 2007ApJ...655.1095A
m7 = Nakajima et al., 2000AJ....119..873N 2000AJ....119..873N
m8 = Comeron et al., 2003A&A...406.1001C 2003A&A...406.1001C
m9 = Merin et al., 2007ApJ...661..361M 2007ApJ...661..361M
Note (2): Spectral type references as follows:
s1 = Hughes et al., 1994AJ....108.1071H 1994AJ....108.1071H
s2 = Jayawardhana & Ivanov, 2006ApJ...647L.167J 2006ApJ...647L.167J
s3 = Luhman et al., 2007ApJ...659.1629L 2007ApJ...659.1629L
s4 = Allen et al., 2007ApJ...655.1095A 2007ApJ...655.1095A
s5 = Comeron et al., 2003A&A...406.1001C 2003A&A...406.1001C
s6 = Merin et al., 2007ApJ...661..361M 2007ApJ...661..361M
s7 = Lopez Marti et al., 2005A&A...440..139L 2005A&A...440..139L
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [Lupus]
7 I1 --- Lup Lupus region (1, 3, or 4)
9- 23 A15 --- SSTc2dJ Object name (HHMMSS.s+DDMMSS, J2000)
25- 29 F5.2 mag Rcmag Cousins R magnitude
31- 35 F5.2 mag Icmag Cousins I magnitude
37- 41 F5.2 mag zmag WFI z magnitude
43- 47 F5.2 mag Jmag 2MASS J magnitude
49- 53 F5.2 mag Hmag 2MASS H magnitude
55- 59 F5.2 mag Ksmag 2MASS Ks magnitude
61- 65 F5.2 mag 3.6mag ? IRAC 3.6um magnitude
67- 71 F5.2 mag 4.5mag ? IRAC 4.5um magnitude
73- 77 F5.2 mag 5.8mag ? IRAC 5.8um magnitude
79- 83 F5.2 mag 8.0mag ? IRAC 8.0um magnitude
85- 89 F5.2 mag 24mag ? IRAC 24um magnitude
91- 93 F3.1 mag AV Absorption in V band
95- 98 I4 K Teff Effective temperature
100-105 F6.4 solLum L Estimated luminosity
107-111 F5.3 solMass Mass ?=- Estimated stellar mass
112 A1 --- l_Age Limit flag on Age
113-116 F4.1 Myr Age ? Estimated age
119-122 A4 --- Notes Notes (1)
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Note (1): Notes as follows:
1 = Weak T Taur star in Krautter et al., 1997, Cat. J/A+AS/123/329
2 = Most likely background giant
3 = X-ray source in Gondoin, 2006, Cat. J/A+A/454/595
4 = Detected at 70µm; [70]=0.62
5 = High residual fit (over 0.2mag rms)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Note Note number
4- 80 A77 --- Text Text of the note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Aug-2009