J/A+A/371/497 OB associations in the spiral galaxy NGC 300 (Pietrzynski+, 2001)
A catalog of OB associations in the spiral galaxy NGC 300.
Pietrzynski G., Gieren W., Fouque P., Pont F.
<Astron. Astrophys. 371, 497 (2001)>
=2001A&A...371..497P 2001A&A...371..497P
ADC_Keywords: Associations, stellar ; Stars, OB
Keywords: galaxies: NGC 300: star clusters - galaxies: stellar content -
stars: early type
Abstract:
We present results of a search for OB associations in NGC 300. Using
an automatic and objective method (PLC technique) 117 objects were
found. Statistical tests indicate that our sample is contaminated by
less than 10 detections due to random concentrations of blue stars.
Spatial distributions of detected associations and H II regions are
strongly correlated. The size distribution reveals a significant peak
at about 60µrad which corresponds to 125 parsecs if a distance
modulus of 26.66mag is assumed. Besides the objects with sizes
corresponding to typical associations we also found several much
larger objects. A second level application of our detection method
revealed that most of these are composed of smaller subgroups, with
sizes of about 100pc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 117 OB association candidates in NGC 300
table3.dat 52 36 OB association candidates in the NGC 300 found
in the regions of potential stellar-complexes
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Byte-by-byte Description of file: table1.dat table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [PGF2001] Name (AS NNN)
7 A1 --- m_[PGF2001] [abcde] Multiplicity index on Name
(in table3.dat only)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 18 F4.1 s RAs Right ascension (J2000)
20 A1 --- DE- Declinationn sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 32 I3 --- Nblue Number of blue stars belonging to the group
34- 36 I3 urad Size Size of the group (in µrad≃0.2arcsec)
38- 40 I3 pc Sizepc Size of the group (in pc)
42 A1 --- Note [*] * more detailed cross-identification
given in table3.dat
43- 60 A18 --- Cross-ID Cross-identification (1)
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Note (1): Arabic numbers correspond to H II regions
(Deharveng et al., 1988A&AS...73..407D 1988A&AS...73..407D), [DCL88] NNNA in Simbad
Roman numbers correspond to objects studied by
Breysacher et al. (1997A&A...326..976B 1997A&A...326..976B), [BAT97] R in Simbad
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 10-Sep-2001