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J/A+A/405/111       LMC Survey of Young Stellar Systems      (Gouliermis+, 2003)

OB stellar associations in the Large Magellanic Cloud: Survey of young stellar systems. Gouliermis D., Kontizas M., Kontizas E., Korakitis R. <Astron. Astrophys. 405, 111 (2003)> =2003A&A...405..111G
ADC_Keywords: Magellanic Clouds ; Surveys ; Clusters, open ; Associations, stellar Keywords: galaxies: individual: LMC - galaxies: star clusters - galaxies: stellar content - surveys Abstract: The method developed by Gouliermis et al. (2000AJ....119.1737G), for the detection and classification of stellar systems in the LMC, was used for the identification of stellar associations and open clusters in the central area of the LMC. This method was applied on the stellar catalog produced from a scanned 1.2m UK Schmidt Telescope Plate in U with a field of view almost 6.5degx6.5deg, centered on the Bar of this galaxy. The survey of the identified systems is presented here followed by the results of the investigation on their spatial distribution and their structural parameters, as were estimated according to our proposed methodology. The detected open clusters and stellar associations show to form large filamentary structures, which are often connected with the loci of HI shells. The derived mean size of the stellar associations in this survey was found to agree with the average size found previously by other authors, for stellar associations in different galaxies. This common size of about 80pc might represent a universal scale for the star formation process, whereas the parameter correlations of the detected loose systems support the distinction between open clusters and stellar associations. Description: Structural parameters for 412 newly detected young stellar systems in the central area of LMC are presented. From them 259 were classified as `intermediate' and 153 as `unbound' systems, according to their central stellar density. The intermediate systems represent mostly open clusters, while the unbound are stellar associations. The set of parameters given here includes the positions of the systems, their dimensions, half-mass and Spitzer radii, as well as their estimated total masses and central densities (within their half-mass radii). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog1.dat 69 259 Parameters for the detected intermediate systems catalog2.dat 69 153 Parameters for the detected unbound systems table3.dat 153 640 Catalog of objects found by SIMBAD located in areas covered by the intermediate and unbound systems of this survey
Byte-by-byte Description of file: catalog?.dat
Bytes Format Units Label Explanations
1- 4 A4 --- ID ID number (1) 7- 8 I2 h RAh Right ascension (J2000) 10- 13 F4.1 min RAm Right ascension (J2000) 16 A1 --- DE- Declination sign (J2000) 17- 18 I2 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 25 I3 pc Size Size of each system 27- 30 I4 --- NStar Number of counted stars 32- 34 I3 --- e_NStar Mean error of number of counted stars 37- 40 F4.1 pc rsp Spitzer radius 43- 46 F4.1 pc rh Half-mass radius 49- 52 F4.1 ksolMass MassMin Minimum estimated mass 54- 57 F4.1 ksolMass MassMax Maximum estimated mass 60- 63 F4.2 solMass/pc3 dens Central stellar density 66- 69 F4.2 solMass/pc3 e_dens Mean error of central stellar density
Note (1): The ID of each system consists of one character followed by four digits. For the intermediate systems (catalog1.dat) we used the character `O' from `Open clusters'. For the unbound systems (catalog2.dat) we used the character `A' from `Associations'.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- ID Identification 6- 28 A23 --- SName Simbad Name 30-128 A99 ---- RObjects Additional related objects 130-131 I2 h RAh Right ascension (J2000) 133-134 I2 min RAm Right ascension (J2000) 136-137 I2 s RAs Right ascension (J2000) 139 A1 --- DE- Declination sign (J2000) 140-141 I2 deg DEd Declination (J2000) 143-146 F4.1 arcmin DEm Declination (J2000) 149-152 A4 --- Type Type of object
Acknowledgements: Dimitrios Gouliermis History: * 24-Oct-2003: table3 was added (kindly supplied by the author)
(End) Dimitrios Gouliermis [Sternwarte Bonn], Patricia Bauer [CDS] 17-Jun-2003
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

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