J/A+A/488/987 Near-infrared survey of R CrA cloud (Haas+, 2008)
A near-infrared survey of the entire R Corona Australis cloud.
Haas M., Heymann F., Domke I., Drass H., Chini R., Hoffmeister V.
<Astron. Astrophys. 488, 987 (2008)>
=2008A&A...488..987H 2008A&A...488..987H
ADC_Keywords: Infrared sources ; Photometry, infrared
Keywords: stars: formation - stars: pre-main sequence -
stars: low-mass, brown dwarfs - infrared: stars
Abstract:
To understand low- to intermediate-mass star-formation in the nearby
R CrA molecular cloud, we try to identify the stellar content that is
accessible with near-infrared observations.
We obtained a JHKs band mosaic of ∼10'x60' covering the entire R CrA
molecular cloud with unprecedented sensitivity. We present a catalogue
of about 3500 near-infrared sources fainter than the saturation limit
Ks∼10mag, reaching Ks∼18mag. We analysed the extended sources by
inspecting their morphology and point sources by means of
colour-colour and colour-magnitude diagrams. Additionally, we compared
the extinction inferred from the NIR data with the line-of-sight dust
emission at 1.2mm. Sources towards high dust emission but relatively
low H-Ks show a projected mm-excess; these sources are either
immediately surrounded by cold circumstellar material or, if too red
to be a true foreground object, they are embedded in the front layer
of the 1.2mm emitting dust cloud. In both cases they are most likely
associated with the cloud.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 82 3451 List of point sources
--------------------------------------------------------------------------------
See also:
J/ApJ/397/520 : IRAS observations in Cr A (Wilking+, 1992)
J/A+AS/116/21 : Extinction toward CrA and Lup (Andreazza+, 1996)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Fld Field name
4- 6 I3 --- Seq Sequential number of source in the field
7 A1 --- m_Seq [ab] Flag for sources with same name (G1)
8- 17 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
19- 28 F10.6 deg DEdeg Declination in decimal degrees (J2000)
30- 34 F5.2 mag Jmag ?=0 J magnitude
36- 39 F4.2 mag e_Jmag ?=0 rms uncertainty on Jmag
41- 45 F5.2 mag Hmag ?=0 H magnitude
47- 50 F4.2 mag e_Hmag ?=0 rms uncertainty on Hmag
52- 56 F5.2 mag Kmag ?=0 K magnitude
58- 61 F4.2 mag e_Kmag ?=0 rms uncertainty on Kmag
63- 67 F5.1 MJy/sr S1.2mm Flux at 1.2mm (250GHz)
69- 72 F4.1 MJy/sr e_S1.2mm rms uncertainty on S1.2mm
74- 80 A7 --- Fields Field(s) (1)
82 A1 --- Mm [m] probable member from table3 (2)
--------------------------------------------------------------------------------
Note (1): The fields are C, D, B, A3, A and NW.
WJ and WH indicate that the J- and H-band photometry has been taken
from Wilking et al., 1997AJ....114.2029W 1997AJ....114.2029W.
----------------------------------------------------
Field RAJ2000 DEJ2000 Field size Obs.date
----------------------------------------------------
C 285.971985 -37.246700 9.5'x9.3' 31/07/2004
D 285.788513 -37.214447 8.6'x9.1' 29/07/2004
B 285.689514 -37.108849 8.5'x9.2' 29/07/2004
A3 285.559021 -37.003448 9.4'x9.5' 29/07/2004
A 285.429504 -36.941799 9.4'x9.1' 30/07/2004
NW 285.447498 -36.925301 8.9'x9.2' 29/07/2004
----------------------------------------------------
Note (2): the 'm' indicates stars belonging to table 3 of the paper
(probable members found via the mm excess technique).
--------------------------------------------------------------------------------
Global notes:
Note (G1): In field C, numbers 9, 10 and 11 appears twice with different
positions. We added a flag, [ab], to differenciate the sources:
-------------------------------------------------------------------------------
Name Seq RAdeg DEdeg Jmag Hmag Kmag S1.2mm F
-------------------------------------------------------------------------------
C 9a 9 285.874603 -37.285294 0.00 0.00 0.00 0.00 17.88 0.29 -1.5 1.4 C
C 9b 9 285.945496 -37.232090 0.00 0.00 17.39 0.04 15.31 0.09 8.8 3.8 C
C 10a 10 285.874725 -37.182022 18.16 0.13 16.85 0.07 15.95 0.07 -1.9 1.6 C
C 10b 10 285.993500 -37.209549 18.16 0.11 16.90 0.07 15.73 0.05 -0.3 1.8 C
C 11a 11 285.875214 -37.177738 19.61 0.27 18.18 0.21 17.11 0.16 0.0 1.2 C
C 11b 11 285.945099 -37.214382 17.25 0.07 16.13 0.04 15.31 0.04 4.4 1.3 C
-------------------------------------------------------------------------------
Nomenclature note:
* Field A, No 1-596
* Field A3, No 1-373
* Field B, No 1-513
* Field C, No 1-936
* Field D, No 1-644
--------------------------------------------------------------------------------
Acknowledgements:
M. Hass, haas(at)astro.rub.de
History:
* 16-Jul-2008: original version
* 17-Dec-2008: multiplicity flag added (see Note (G1) section above)
* 13-Oct-2009: added the probable membership flag (column 'Mm')
(End) Patricia Vannier [CDS] 16-Jul-2008