J/AJ/107/1054 UBV photometry of the 30 Dor region (Malumuth+, 1994)
UBV stellar photometry of the 30 Doradus region of the Large Magellanic Cloud
with the Hubble Space Telescope
Malumuth E.M., Heap S.R.
<Astron. J. 107, 1054 (1994)>
=1994AJ....107.1054M 1994AJ....107.1054M
ADC_Keywords: H II regions ; Photometry, UBV
Abstract:
We report on Planetary Camera observations of the central region of 30
Doradus in the Large Magellanic Cloud. These images of 30 Doradus are
the first "deep" HST exposures that have appropriate photometric
calibration. The B band (F439W) image, which shows R136a at the center
of the PC6 CCD chip, reveals over 200 stars within 3" of the center of
R136a, and over 800 stars in a 35"x35" area. We used Malumuth et al.'s
[The First Year of HST Observations, edited by A. L. Kinney and J. C.
Blades (ST ScI, Baltimore) (1991)] PSF-fitting method to measure the
magnitudes of all stars on the PC6 chip. These new B magnitudes, along
with U and V magnitudes from archival PC images, yield a luminosity
function, mass density profile, and initial mass function of the 30
Doradus ionizing cluster. The mass distribution is well fit by a King
model with a core radius, Rc=0.96" (0.24pc), a tidal radius, Rt=110"
(28pc), and a total mass, M=16800M☉. Both the luminosity
function and initial mass function show evidence for mass segregation,
in the sense that the central region has a higher fraction of massive
stars than the outer regions. This is the first observational evidence
for mass segregation in a very young cluster (age ∼3 million years).
The observations admit the hypothesis that the mass segregation
occurred in the process of star formation and/or that the mass
segregation is the result of dynamical evolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aasman.sty 77 164 aasmanuscript.sty LaTeX style file
table2.tex 99 1130 LaTeX version of table2.dat
table2.dat 48 1010 30 Doradus photometry
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Byte-per-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Identification number
(Cl* NGC 2070 MH in Simbad)
7- 8 I2 h RAh Right ascension J2000
10- 11 I2 min RAm Right ascension J2000
13- 17 F5.2 s RAs Right ascension J2000
19 A1 --- DE- Declination sign
20- 21 I2 deg DEd Declination J2000
23- 24 I2 arcmin DEm Declination J2000
26- 29 F4.1 arcsec DEs Declination J2000
32- 36 F5.2 mag Umag ? Johnson U magnitude
38- 42 F5.2 mag Bmag ? Johnson B magnitude
44- 48 F5.2 mag Vmag ? Johnson V magnitude
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Table 3. Other designations for bright stars.
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ID # Name Parker # Campbell #
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#17 Melnick 36 706 6019
#57 Melnick 39 767 6003
#71 R 134 786 6001
#283 Melnick 37Wb 897 6018
#339 Melnick 37Wa 917 6005
#374 Melnick 42 922 6002
#454 R 136a6
#467 R 136a3
#474 R 136a4
#480 R 136a8
#493 Melnick 37 949 6007
#498 R 136a1
#509 R 136a7
#511 R 136a2
#519 R 136a5
#637 R 136b 985 26
#681 R 136c 998 25
#716 Melnick 35N 1013 6017
#728 Melnick 30 1018 7005
#742 Melnick 35 1029 6006
#749 Melnick 35Sa 1036 6010
#859 Melnick 33Sb 1111 6013
#870 Melnick 33Sa 1120 6009
#878 Melnick 32 1130 7003
#880 Melnick 34 1134 6004
#887 Melnick 33Na 1140 6008
#900 Melnick 33Nb 1152 6014
#959 R 141 1253 7002
#963 Melnick 24 1260 7009
#980 Melnick 15Sb 1304 7029
#983 Melnick 15Sa 1306 7021
#984 Melnick 15 1312 7160
#986 Melnick 14N 1317 6020
#999 Melnick 14 1350 5004
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Origin: AAS CD-ROM series, Volume 2, 1994
(End) L. Brotzman [ADS] 05-May-1994, P. Bauer, J. Marcout [CDS] 19-Oct-1994