J/AJ/126/1916 JHK photometry of young clusters near the Sun (Porras+, 2003)
A catalog of young stellar groups and clusters within 1 kiloparsec of the Sun.
Porras A., Christopher M., Allen L., Di Francesco J., Megeath S.T.,
Myers P.C.
<Astron. J., 126, 1916-1924 (2003)>
=2003AJ....126.1916P 2003AJ....126.1916P
ADC_Keywords: Associations, stellar ; Photometry, infrared
Keywords: catalogs - infrared: general -
open clusters and associations: general - stars: formation
Abstract:
We present a catalog of near-infrared surveys of young
(≲a few 106yr) stellar groups and clusters within 1kpc from the
Sun, based on an extensive search of the literature from the past ten
years. We find 143 surveys from 69 published articles, covering 73
different regions. The number distribution of stars in a region has a
median of 28 and a mean of 100. About 80% of the stars are in clusters
with at least 100 members. By a rough classification of the groups and
clusters based on the number of their associated stars, we show that
most of the stars form in large clusters. The spatial distribution of
catalogued regions in the Galactic plane shows a relative lack of
observed stellar groups and clusters in the range 270°<l<60°
of Galactic longitude, reflecting our location between the Local and
Sagittarius arms. This compilation is intended as a useful resource
for future studies of nearby young regions of multiple star formation.
Description:
Our surveys catalog contains 143 entries compiled from 69 different
papers and covering 73 star-forming regions. Twenty-five of the
entries in our catalog were recorded in the Hodapp (1994, Cat.
J/ApJS/94/615) survey of IRAS sources with molecular outflows and
14 are in recent surveys of Herbig Ae/Be stars by Testi et al.
(1997A&A...320..159T 1997A&A...320..159T), Testi, Palla, & Natta (1998A&AS..133...81T 1998A&AS..133...81T,
1999A&A...342..515T 1999A&A...342..515T). Forty-seven of the 73 entries in our catalog of
groups and clusters also appear in the catalog of Bica et al. (2003,
Cat. J/A+A/397/177), and 25 clusters in the catalog of Lada & Lada
(2003ARA&A..41...57L 2003ARA&A..41...57L). Twenty-seven of the 30 regions studied by Ridge
et al. (2003AJ....126..286R 2003AJ....126..286R) are coincident with our catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 143 Near-IR Surveys of Young Stellar Groups and
Clusters within 1 kiloparsec
table2.dat 98 73 Young Stellar Groups and Clusters within 1kpc
refs.dat 56 71 References
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See also:
J/ApJS/94/615 : Molecular outflow sources (Hodapp, 1994)
J/A+A/397/177 : IR star clusters and stellar groups catalog (Bica+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SNum [1/143] Survey number
5- 15 A11 --- GNum Group or cluster identification numbers
17- 18 I2 h RAh Hour of right ascension (J2000)
20- 21 I2 min RAm Minute of right ascension (J2000)
23- 24 I2 s RAs Second of right ascension (J2000)
26 A1 --- DE- Sign of the declination (J2000)
27- 28 I2 deg DEd Degree of declination (J2000)
30- 31 I2 arcmin DEm Arcminute of declination (J2000)
33- 34 I2 arcsec DEs Arcsecond of declination (J2000)
36- 41 F6.2 arcmin DRA Spatial extent in right ascension
43- 48 F6.2 arcmin DDE Spatial extent in declination
50- 74 A25 --- Name Name of the star-forming region
76- 79 F4.1 mag JLim ? J-band quoted completeness limit magnitude
81- 84 F4.1 mag HLim ? H-band quoted completeness limit magnitude
86- 89 F4.1 mag KLim ? K-band quoted completeness limit magnitude
91 A1 --- n_KLim Note on KLim (1)
93- 97 A5 --- r_SNum References on SNum, in refs.dat file
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Note (1): Notes on KLim as follows:
a = From 2MASS data
b = 90% completeness limit
c = 5 σ detection limit
d = 10 σ detection limit
e = 75% completeness limit
f = 95% completeness limit
g = 92% completeness limit
h = 3 σ detection limit
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- GNum [1/73] Group or cluster number
4- 20 A17 --- SNum Survey identification numbers (.. for interval)
22- 48 A27 --- Name Cluster name
50- 51 I2 h RAh Hour of right ascension (J2000)
53- 54 I2 min RAm Minute of right ascension (J2000)
56- 57 I2 s RAs Second of right ascension (J2000)
59 A1 --- DE- Sign of the declination (J2000)
60- 61 I2 deg DEd Degree of declination (J2000)
63- 64 I2 arcmin DEm Arcminute of declination (J2000)
66- 67 I2 arcsec DEs Arcsecond of declination (J2000)
69- 72 I4 pc Dist Distance to the group or cluster (1)
74- 77 I4 pc EDist ? Upper limit on Dist if given
79 A1 --- l_Nst Limit flag on NStars
80- 83 I4 --- Nst ? Number of associated stars within the
star-forming region (2)
85 I1 --- e_Nst ? Uncertainty in associated stars
87- 88 A2 --- r_RAh References for adopted coordinates,
see refs.dat file
90- 94 A5 --- r_Dist References for adopted distance,
see refs.dat file
96- 97 A2 --- r_Nst References for adopted associated stars,
see refs.dat file
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Note (1): In cases where more than one survey has covered the region and the
distances differ, we have adopted the value more generally accepted.
Note (2): When there are several estimates in the literature of the number of
associated stars in one region, we adopt values that seem to be more
complete, according to the size of the surveyed area and the
sensitivity of the photometric measurements.
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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 number
4- 22 A19 --- BibCode BibCode
25- 56 A32 --- Aut Author's name
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Mar-2004