J/AJ/127/1632 UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004)
Massive field stars and the stellar clustering law.
Oey M.S., King N.L., Parker J.W.
<Astron. J., 127, 1632-1643 (2004)>
=2004AJ....127.1632O 2004AJ....127.1632O
ADC_Keywords: Magellanic Clouds ; Photometry, UBVRI
Keywords: galaxies: star clusters - galaxies: stellar content -
Magellanic Clouds - stars: early-type - stars: formation -
stars: statistics
Abstract:
The distribution of N*, the number of OB stars per association or
cluster, appears to follow a universal power-law form (N*)-2 in the
local universe. We evaluate the distribution of N* in the Small
Magellanic Cloud using recent broadband optical and space-ultraviolet
data, with special attention to the lowest values of N*. We find that
the power-law distribution in N* continues smoothly down to N*=1. This
strongly suggests that the formation of field massive stars is a
continuous process with those in associations and that the field stars
do not originate from a different star formation mode.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 43 111 Groups from the candidate OB sample
table3.dat 43 29 Groups from the candidate O-star sample
table4.dat 84 1360 Group Membership for the Candidate OB Sample
table5.dat 83 382 Group Membership for the Candidate O Star Sample
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See also:
II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [OKP2004] Group designation (G1)
8- 14 F7.4 deg RAdeg Right ascension in decimal degrees (J2000.0) (1)
16- 23 F8.4 deg DEdeg Declination in decimal degrees (J2000.0) (1)
25- 29 F5.2 arcmin Diam Mean diameter in arcmin
33- 38 F6.2 pc Diampc Mean diameter in pc
42- 43 I2 --- NStar Number of stars in the group
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Note (1): Group centroid position
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Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 deg RAdeg Right ascension in decimal degrees (J2000)
9- 16 F8.4 deg DEdeg Declination in decimal degrees (J2000)
18- 22 F5.2 mag Umag The U-band magnitude
24- 27 F4.2 mag e_Umag Error in Umag
29- 33 F5.2 mag Bmag The B-band magnitude
35- 38 F4.2 mag e_Bmag Error in Bmag
40- 44 F5.2 mag Vmag The V-band magnitude
46- 49 F4.2 mag e_Vmag Error in Vmag
51- 55 F5.2 mag Rcmag The Cousins R-band magnitude
57- 60 F4.2 mag e_Rcmag Error in Rcmag
62- 66 F5.2 mag UITmag ? The UIT B5-band magnitude (1)
68- 71 F4.2 mag e_UITmag ? Error in UITmag (1)
73- 77 I5 --- [M2002] Massey (2002, Cat. II/236) identification
number, [M2002] LMC NNNNNN in Simbad
79- 84 A6 --- [OKP2004] This work's group identification number (G1)
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Note (1): Only in table5.dat.
B5 filter of Ultraviolet Imaging Telescope:
λeff=161.5nm, width 22.5nm
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Global notes:
Note (G1): Nomenclature:
In tables 2 and 4: [OKP2004] OB NNN in Simbad
In tables 3 and 5: [OKP2004] O NNN in Simbad
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004