Access to Astronomical Catalogues

← Click to display the menu
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
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), Testi, Palla, & Natta (1998A&AS..133...81T, 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). Twenty-seven of the 30 regions studied by Ridge et al. (2003AJ....126..286R) are coincident with our catalog. File Summary:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 25- 56 A32 --- Aut Author's name
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Mar-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact