J/AJ/135/2496 Near-IR survey of Class I protostars (Connelley+, 2008)
The evolution of the multiplicity of embedded protostars.
I. Sample properties and binary detections.
Connelley M.S., Reipurth B., Tokunaga A.T.
<Astron. J., 135, 2496-2525 (2008)>
=2008AJ....135.2496C 2008AJ....135.2496C
ADC_Keywords: Stars, double and multiple ; YSOs ; Photometry, infrared
Keywords: binaries: general - infrared: stars - stars: formation -
stars: statistics
Abstract:
We present the observational results of a near-infrared survey of a
large sample of Class I protostars designed to determine the Class I
binary separation distribution from ∼100AU to ∼5000AU. We have
selected targets from a new sample of 267 nearby candidate Class I
objects. This sample is well understood, consists of mostly Class I
young stellar objects (YSOs) within 1kpc, has targets selected from
the whole sky, and is not biased by previous studies of star
formation.
Description:
We used the UH 2.2m telescope with QUIRC (1024 HgCdTe 1-2.5um 3' field
of view (FOV)), the NASA IRTF with the SpeX guider (512 InSb 1-5um 1'
FOV) and NSFCam2 (2048 Hawaii-2RG 1-5.5um 82" FOV), UKIRT with UIST
(1024 InSb 1-5um 1' FOV), and Subaru Telescope with CIAO (10242 InSb
1-5um 22" FOV) and IRCS (1024 InSb 1-5um 1' FOV).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 128 242 Source characteristics
table4.dat 91 483 Target photometry
table5.dat 78 89 Binary properties
table6.dat 73 189 Binary detection limits
refs.dat 124 53 References
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See also:
VII/233 : The 2MASS Extended sources, 2MASX (IPAC/UMass, 2003-2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- IRAS IRAS identification
15- 57 A43 --- Assoc Association(s) (1)
59- 63 I5 pc Dist ? Estimated heliocentric distance
65- 66 I2 --- r_Dist Reference for Dist, in refs.dat file
68- 75 F8.1 solLum Lbol ? Bolometric luminosity
77- 78 I2 h RAh 2MASS Hour of Right Ascension (J2000)
80- 81 I2 min RAm 2MASS Minute of Right Ascension (J2000)
83- 87 F5.2 s RAs 2MASS Second of Right Ascension (J2000)
89 A1 --- pf [I*] Position flag (2)
91 A1 --- DE- Sign of the the 2MASS Declination (J2000)
92- 93 I2 deg DEd 2MASS Degree of Declination (J2000)
95- 96 I2 arcmin DEm 2MASS Arcminute of Declination (J2000)
98-101 F4.1 arcsec DEs 2MASS Arcsecond of Declination (J2000)
103-108 F6.3 mag Jmag ? 2MASX J band magnitude
110-115 F6.3 mag Hmag ? 2MASX H band magnitude
117-122 F6.3 mag Kmag ? 2MASX Ks band magnitude
124-128 F5.2 --- alpha ? Lada (1991) source spectral index (3)
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Note (1): RNO designates objects in "Red and Nebulous Objects in Dark
Clouds: a Survey". (Cohen, 1980AJ.....85...29C 1980AJ.....85...29C).
Note (2): Position flag as follows:
I = A near-IR counterpart could not be identified in the 2MASS
images so the coordinates are from IRAS
* = Not explicited in the paper
Note (3): Lada, 1991, The Physics of Star Formation and Early Stellar
Evolution, ed. C. J. Lada & N. D. Kylafis (Dordrecht: Kluwer), 329
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- IRAS IRAS identification
15- 16 A2 --- m_IRAS Identifier number in L' source finder chart
18 A1 --- f_Hmag Limit or approximate flag on Hmag
19- 24 F6.3 mag Hmag ? The H band magnitude
25 A1 --- n_Hmag [*] confused Hmag (1)
27- 30 F4.2 mag e_Hmag ? Uncertainty in Hmag; see Section 3.5
32- 41 A10 "D/M/Y" HObs Date of the H band observation
42 A1 --- n_HObs [2]? 2 if 2MASS observation
43 A1 --- f_Kmag Limit flag on Kmag
44- 49 F6.3 mag Kmag ? The K band magnitude
50 A1 --- n_Kmag [*] confused Kmag (1)
52- 55 F4.2 mag e_Kmag ? Uncertainty in Kmag; see Section 3.5
57- 66 A10 "D/M/Y" KObs Date Day of the K band observation
67 A1 --- n_KObs [2]? 2 if 2MASS observation
69- 74 F6.3 mag Lmag ? The L band magnitude
75 A1 --- n_Lmag [*] confused Lmag (1)
77- 80 F4.2 mag e_Lmag ? Uncertainty in Lmag; see Section 3.5
82- 91 A10 "D/M/Y" LObs Date Day of the L' band observation
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Note (1): * indicates that the photometry includes flux from this source
and an adjacent source, which were not resolved in this wavelength
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- IRAS IRAS identification
15- 16 I2 --- m_IRAS ? Primary star number in finding chart (1)
18- 21 I4 pc Dist ?=- Estimated heliocentric distance
23- 26 F4.2 mag DelL L' magnitude difference (2)
28- 32 F5.2 arcsec Sep Angular separation (2)
34- 38 F5.1 deg PA Position angle of secondary star
40- 78 A39 --- Disc Discoverer
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Note (1): If there is more than one primary object per IRAS source.
Note (2): Between primary and secondary stars.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- IRAS IRAS identification
15- 16 I2 --- m_IRAS ? Primary star number in finding chart (1)
18- 21 I4 pc Dist ? Estimated heliocentric distance (2)
23- 28 F6.2 arcsec inL1 ? ΔL'=1mag inner detection limit (3)
30- 35 F6.2 arcsec inL2 ? ΔL'=2mag inner detection limit (3)
37- 42 F6.2 arcsec inL3 ? ΔL'=3mag inner detection limit (3)
44- 49 F6.2 arcsec inL4 ? ΔL'=4mag inner detection limit (3)
51- 55 F5.2 arcsec outL1 ΔL'=1mag outer detection limit (4)
57- 61 F5.2 arcsec outL2 ΔL'=2mag outer detection limit (4)
63- 67 F5.2 arcsec outL3 ΔL'=3mag outer detection limit (4)
69- 73 F5.2 arcsec outL4 ΔL'=4mag outer detection limit (4)
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Note (1): If there is more than one primary object per IRAS source.
Note (2): A blank indicates that a distance estimate was searched for but
one couldn't be found.
Note (3): The closest distance from the primary star that a fake companion
star of the stated magnitude difference could be detected. If inner
detection limit is 999., then a companion of that contrast cannot be
detected at any separation.
Note (4): The farthest that a binary companion could be accepted. This is
limited by our 5000AU separation limit or the 5% contamination
criterion.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 52 A29 --- Aut Author's name
54-124 A71 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 14-Jan-2011