J/A+A/438/663 JHKL photometry of 30 Dor (Maercker+, 2005)
L-band (3.5 micron) IR-excess in massive star formation. I. 30 Doradus.
Maercker M., Burton M.G.
<Astron. Astrophys. 438, 663 (2005)>
=2005A&A...438..663M 2005A&A...438..663M
ADC_Keywords: Clusters, open ; Photometry, infrared
Keywords: stars: circumstellar matter -stars: formation -stars: evolution -
Hertzsprung-Russel (HR) and C-M diagrams -
planetary systems: protoplanetary disks - stars: pre-main sequence
Abstract:
L-band data of 30 Doradus at 3.5 micron taken with SPIREX (South Pole
Infrared Explorer) is presented. The photometry was combined with
2MASS (II/246) JHK data at 1.25 -2.2 micron. Colour-colour and
colour-magnitude diagrams are constructed and used to determine the
sources with infrared excess. These are interpreted as circumstellar
disks, and enable the fraction of sources with disks (the cluster disk
fraction or CDF) to be determined. We find that ∼42% of the sources
detected at L-band in 30 Doradus have an IR-excess.
Description:
Magnitudes for all sources (including foreground sources and sources
below the 90% completeness limit) in 30 Doradus. Stars with
measurements in all four bands are listed first. Then stars with
measurements in K and L only, and finally stars just detected in
L-band. For each source the source ID, RA and Dec in J2000, the JHKL
magnitudes and photometric errors and comments on IR-excess, likely
foreground stars and matches with Rubio et al. (1998AJ....116.1708R 1998AJ....116.1708R),
Brandner et al. (2001AJ....122..858B 2001AJ....122..858B) and Parker et al. (1993,
Cat. II/187) are given. The coordinates for sources found in all
four bands are from the point source catalogue, positions for the
remaining stars are determined from reference 2MASS (II/246) images.
For sources detected in all bands, the JHK magnitudes and errors are
taken from the 2MASS PSC (II/246).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 93 215 Magnitudes for all sources (including foreground
sources and sources below the 90% completeness
limit) in 30 Doradus
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/107/1054 : 30 Dor region UBV photometry (Malumuth+, 1994)
J/ApJ/413/604 : 30 Dor (Hill+, 1993)
J/ApJ/466/254 : NIR Imaging of R136 in 30 Dor (Brandl+ 1996)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
6 I1 h RAh Right ascension J2000 (hours)
8- 9 I2 min RAm Right ascension J2000 (minutes)
11- 14 F4.1 s RAs Right ascension J2000 (seconds)
16 A1 --- DE- Declination J2000 (sign)
17- 18 I2 deg DEd Declination J2000 (degrees)
20- 21 I2 arcmin DEm Declination J2000 (arcmin)
23- 26 F4.1 arcsec DEs Declination J2000 (arcsec)
28- 31 F4.1 mag Jmag ? Johnson J-band magnitude (1)
33- 36 F4.2 mag e_Jmag ? Error in J-band magnitude (2)
38- 41 F4.1 mag Hmag ? Johnson H-band magnitude (1)
43- 46 F4.2 mag e_Hmag ? Error in H-band magnitude (2)
48- 51 F4.1 mag Kmag ? Johnson K-band magnitude (1)
53- 56 F4.2 mag e_Kmag ? Error in K-band magnitude (2)
58- 61 F4.1 mag Lmag ? Johnson L-band magnitude (1)
63- 66 F4.2 mag e_Lmag ? Error in L-band magnitude (2) (3)
68- 93 A26 --- Com Comments (4)
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Note (1): Sources only detected in the K- and L-bands have magnitudes
from this work. For sources not detected at J,H or K the upper
limits on these magnitudes are 15.8, 15.1 and 14.3 respectively.
Note (2): A '----' as error indicates that no photometric error was
given in the 2MASS-PSC (II/246).
Note (3): The L-band errors are combined from the errors in daophot
and the errors due to the zero point correction.
Note (4): Comments as follows:
e = stars with IR-excess
fg = Likely foreground stars
Rubio = Stars matched with Rubio et al. (1998AJ....116.1708R 1998AJ....116.1708R)
[RBW98] IRSW-NNN in Simbad
Parker = Stars matched with Parker (1993, Cat. II/187)
[P93] NNNN in Simbad
Brandner = Stars matched with Brandner et al. (2001AJ....122..858B 2001AJ....122..858B)
30Dor-NIC NNa in Simbad
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Acknowledgements: Matthias Maercker, maercker(at)astro.su.se
(End) Matthias Maercker [Stockholm Obs.], Patricia Vannier [CDS] 28-Apr-2005