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J/ApJ/397/520 IRAS observations in Cr A (Wilking+, 1992)
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IRAS observations of young stellar objects in the Corona Australis dark cloud
Wilking B.A., Thomas P.G., Lada C.J., Meyer M.R., Young E.T.
<Astrophys. J. 397, 520 (1992)>
=1992ApJ...397..520W (SIMBAD/NED Reference)
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ADC_Keywords: Infrared sources; Photometry, infrared; Associations, stellar
Keywords: infrared: stars - ISM: clouds -
ISM: individual (Corona Australis Cloud) - stars: pre-main sequence
Description:
An analysis of IRAS data is presented for a 57pc^2^ area of the nearby
Corona Australis dark cloud complex. A total of 79 far-infrared sources
are detected at 12{mu}m or in at least three IRAS bands. Combining
these data with both newly obtained and previously published
optical/infrared data, a total of 16 IRAS sources are identified with
young stellar objects which are in close proximity to the R Coronae
Australis cloud or Rossano Cloud B. Among these objects is a cold,
heavily obscured young stellar object, IRAS 32, which radiates only
in the 25-100{mu}m bands and is found to be associated with an
extended near-infrared nebula. The majority of the remaining 63 IRAS
sources in the sample appear to be related to field stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 127 15 *IRAS Sources with S(25)/S(12)>0.8.
table2 93 64 *IRAS Sources with S(25)/S(12)<0.8.
table3 108 59 Near-infrared photometry of IRAS sources
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Note on table1 and table2: IRAS sources positions are:
18h52mn<=RA<=19h20mn, -36deg30"<=DE<=-38deg30"
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 2 I2 --- No []? Source number
4- 5 I2 h RAh Right ascension 1950
7- 8 I2 min RAm Right ascension 1950
10- 13 F4.1 s RAs Right ascension 1950
15 A1 --- DE- Declination sign
16- 17 I2 deg DEd Declination 1950
19- 20 I2 arcmin DEm Declination 1950
22- 23 I2 arcsec DEs Declination 1950
25 A1 --- l_S12 [<] Limit flag on S12
26- 31 F6.2 Jy S12 Flux density at 12 {mu}m (1)
32 A1 --- u_S12 Uncertainty flag on S12
34- 37 F4.2 arcmin W12 []? Source size deconvolved with a Gaussian
beam of 0.76' (12{mu}m)
38 A1 --- u_W12 Uncertainty flag on W12
39 A1 --- n_W12 [p] p indicates that source size is consistent
with point source
41- 46 F6.2 Jy S25 Flux density at 25 {mu}m (1)
47 A1 --- u_S25 Uncertainty flag on S25
49- 52 F4.2 arcmin W25 []? Source size deconvolved with a Gaussian
beam of 0.77' (25{mu}m)
53 A1 --- u_W25 Uncertainty flag on W25
54 A1 --- n_W25 [p] p indicates that source size is consistent
with point source
56 A1 --- l_S60 [<] Limit flag on S60
57- 62 F6.2 Jy S60 Flux density at 60 {mu}m (1)
63 A1 --- u_S60 Uncertainty flag on S60
65- 68 F4.2 arcmin W60 []? Source size deconvolved with a Gaussian
beam of 1.39' (60{mu}m)
69 A1 --- n_W60 [p] p indicates that source size is consistent
with point source
71 A1 --- l_S100 [<] Limit flag on S100
72- 77 F6.1 Jy S100 []? Flux density at 100 {mu}m (1)
78 A1 --- u_S100 Uncertainty flag on S100
79 A1 --- n_S100 [c] c indicates source confusion
81- 83 F3.1 arcmin W100 []? Source size deconvolved with a Gaussian
beam of 2.96' (100{mu}m)
84 A1 --- u_W100 Uncertainty flag on W100
85 A1 --- n_W100 [p] p indicates that source size is consistent
with point source
87- 93 A7 --- Star Visible stars? (2)
95-134 A40 --- Notes Associations, notes (3)
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Note (1): Flux densities and source sizes followed by a colon are uncertain due
to low signal-to-noise and/or source confusion. "c" indicates source
confusion which did not permit a flux determination. All flux
densities were determined from in-scan slices using the ADDSCAN
utility, except for Sources 21 and 34 which were derived from the
Pointed Observations
Note (2): "TT" denotes T Tauri star. References to spectral types and H{alpha}
emission from Knacke et al. 1973 and Marraco & Rydgren 1981.
Note (3): (1) Near-infrared photometry for 2{mu}m sources presented in Table 3
(2) Extended emission associated with visible reflection nebula.
(3) Source is badly confused in all bands. Integrated fluxes are
greater than 60Jy at 60 mum and greater than 240Jy at 100{mu}m.
(4) S CrA is a double with separation of 1.4 (Herbig 1962).
(5) Far-infrared source also mapped by Cruz-Gonzales, McBreen, &
Fazio 1984 and/or Wilking et al. 1985.
(6) TS 13.1, R1, and R2 are from the 2{mu}m survey of
Taylor & Storey 1984.
(7) The HH100-IR source is confused with R CrA. Flux densities for
both sources were derived assuming R CrA is a point source in
all bands.
(8) VV CrA is a double star with separation of 2" with companion
brightest in the infrared (B. Reipurth 1991, private comm.).
(9) VSS 10 is from the 2 mum survey of Vrba, Strom, & Strom 1976a.
(10) Source associated with Cloud B (Rossano 1978).
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 2 I2 --- No []? Source number
4- 5 I2 h RAh Right ascension 1950
7- 8 I2 min RAm Right ascension 1950
10- 13 F4.1 s RAs Right ascension 1950
15 A1 --- DE- Declination sign
16- 17 I2 deg DEd Declination 1950
19- 20 I2 arcmin DEm Declination 1950
22- 23 I2 arcsec DEs Declination 1950
25- 30 F6.2 Jy S12 Flux density at 12 {mu}m (1)
31 A1 --- u_S12 Uncertainty flag on S12
33 A1 --- l_S25 [<] Limit flag on S25
34- 39 F6.2 Jy S25 Flux density at 25 {mu}m (1)
40 A1 --- u_S25 Uncertainty flag on S25
42 A1 --- l_S60 [<] Limit flag on S60
43- 47 F5.2 Jy S60 Flux density at 60 {mu}m (1)
49 A1 --- l_S100 [<] Limit flag on S100
50- 54 F5.2 Jy S100 []? Flux density at 100 {mu}m (1)
55 A1 --- n_S100 [c] c indicates source confusion
57- 64 A8 --- Star Visible stars? (2)
67-106 A40 --- Notes Associations, notes (3)
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Note (1): Flux densities and source sizes followed by a colon are uncertain due
to low signal-to-noise and/or source confusion. "c" indicates where
source confusion did not permit a flux determination. All flux
densities were determined from in-scan slices using the ADDSCAN.
Upper limits are 3 times the rms noise. Except where noted in col.
"Notes", all in-scan sources sizes are consistent with point sources.
Note (2): "Yes" denotes star(s) of magnitude 13 or brighter at photographic B
or V within 45" in r.a. and 25" in decl. of the IRAS position. Star
names are from either the SAO catalog or the Guide Star Catalog.
Spectral classifications are given as recorded in the SIMBAD database.
Note (3): (1) Also GSC 7421.0894
(2) Cirrus heated by nearby B8 IV star (Leene 1986). Deconvolved
source sizes are W(12)=1.9", W(25)=3.0', W(60)=1.8', and
W(100)=4.1". See Leene for integrated fluxes.
(3) Mira variable (Feast, 1963)
(4) A foreground eclipsing binary star (Tapia & Whelan, 1975).
(5) Photometry for 2{mu}m sources associated with IRAS source is
presented in table3.
(6) Visible star in polarimetric study of Vrba, Strom & Strom 1976b
(VSSb) or Vrba, Coyne & Tapia 1984 (VCT).
(7) Deconvolved source sizes are W(12)=0.82', W(25)=1.1', and
W(60)=1.0'.
(8) IRAS LRS spectrum displays 10{mu}m emission feature plus "blue"
continuum characteristics of an AGB star (Olnon & Raimond 1986)
(9) Also GSC 7917.0901 which appears to be variable.
(10) A foreground star which is double (Penny 1979).
(11) A foreground star, HR 7232
(12) A foreground star, HR 7254
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Source name
12- 13 I2 h RAh Right ascension 1950
15- 16 I2 min RAm Right ascension 1950
18- 21 F4.1 s RAs Right ascension 1950
23 A1 --- DE- Declination sign
24- 25 I2 deg DEd Declination 1950
27- 28 I2 arcmin DEm Declination 1950
30- 31 I2 arcsec DEs Declination 1950
35- 39 A5 --- Vis Visibility (1)
40 A1 --- l_Jmag [>] limit flag on Jmag
41- 45 F5.2 mag Jmag []? J magnitude (2)
48 A1 --- l_Hmag [>] limit flag on Hmag
49- 53 F5.2 mag Hmag []? H magnitude (2)
57- 60 F4.2 mag e_Hmag []? rms uncertainty on Hmag
63 A1 --- l_Kmag [>] limit flag on Kmag
64- 68 F5.2 mag Kmag []? K magnitude (2)
71- 74 F4.2 mag e_Kmag []? rms uncertainty on Kmag
76 A1 --- l_Lmag [>] limit flag on Lmag
77- 81 F5.2 mag Lmag []? L magnitude (2)
82 A1 --- u_Lmag Uncertainty flag on Lmag
84- 87 A4 --- Obs Type of observations (CTIO or IRTF)
91-120 A30 --- Notes Notes (3)
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Note (1): "Yes" denotes either star was visible in focal plane camera
(V <14 mag) or has published spectrum as referenced in col. "Notes".
TT denotes a T Tauri star.
Note (2): Magnitudes at H and K are given in cols. Hmag and Kmag and are
followed by their statistical one sigma errors in cols. e_Hmag and
e_Kmag respectively, when they exceed absolute uncertainties.
L photometry is quoted for a 4" (CTIO) or 6" aperture (IRTF).
H and K photometry are quoted for a 6" apertures, except where noted
in col. "Notes".
Note (3): Source names from Glass & Penston 1975 (GP), Vrba, Strom, &
Strom 1976a (VSS), Vrba, Strom, & Strom 1976b (VSSb), Marraco &
Rydgren 1981 (H{alpha}), Vrba, Coyne, & Tapia 1984 (VCT), and the
Guide Star Catalog (GSC, Laskeret al.1990).
d: Magnitude could be slightly underestimated due to faint source in
sky annulus.
e: Spectral type from Vrba & Rydgren 1984.
f: Companion to HD 176386. Magnitudes could be slightly overestimated
due to contamination from primary.
g: Spectral type from Marraco & Rydgren 1981.
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Historical Notes: Keypunched at CDS
References:
Cruz-Gonzales I., McBreen B., & Fazio G.G., 1984,ApJ, 279, 679
Feast M.W., 1963, MNRAS, 125, 367
Glass I.S. & Penston M.V., 1975, MNRAS, 172, 227 (GP)
Herbig G.H., 1962, Adv. Astron. Astrophys., 1, 47
Knacke R.F. et al., 1973, ApJ, 179, 847
Lasker B.M. et al., 1990, AJ, 99, 2019 (GSC)
Leene A., 1986, A&A, 154, 295
Marraco H.G. & Rydgren A.E., 1981, AJ, 86, 62
Olnon F.M. & Raimond E., 1986, A&AS, 65, 607
Penny A.J., 1979, MNRAS, 187, 829
Rossano G.S., 1978, AJ, 83, 234
Tapia S. & Whelan J., 1975, ApJ, 200, 98
Taylor K.N.R. & Storey J.W.V., 1984, MNRAS, 209, 5P (TS)
Vrba F.J., Coyne G.V. & Tapia S., 1984, ApJ, 243, 489 (VCT)
Vrba F.J. & Rydgren A.E., 1984, ApJ, 283, 123
Vrba F.J., Strom S.E. & Strom K.M., 1976a, AJ, 81, 317 (VSS)
Vrba F.J., Strom S.E. & Strom K.M., 1976b, AJ, 81, 958 (VSSb)
Wilking B.A. et al., 1985, ApJ, 293, 165
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(End) Marie-Jose Wagner, Patricia Bauer [CDS] 08-Mar-1995