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II/187 30 Doradus OB Associations (Parker 1992)
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30 Doradus in the Large Magellanic Cloud: The Stellar Content and
Initial Mass Function
Parker J.W.
<Publ. Astron. Soc. Pac. 104, 1107 (1992)>
=1992PASP..104.1107P (SIMBAD/NED RefCode)
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ADC_Keywords: Magellanic Clouds; Clusters, open; Photometry, UBV
Abstract:
Johnson UBV photometry is presented for 2395 stars in the OB
associations of 30 Doradus in the Large Magellanic Cloud. The CCD
fields cover an area of 50 square arcminutes in the central
region. The entire catalog (exclusive of the dense core cluster R
136) is photometrically complete to V = B = 18 mag and U = 17 mag,
although the completeness magnitudes are fainter for regions with
less nebular contamination.
Introduction:
These data have been reduced from 39 CCD frames (with short,
medium, and long exposure times ranging from 3 to 1000 seconds)
using the photometry program DAOPHOT written by Peter Stetson
(1987, PASP, 99, 191). The photometric errors listed in these
tables are the errors derived by DAOPHOT using the relative
magnitude of the star on the CCD and the goodness of the fit of
the point spread function. Most stars appear on more than one CCD
frame per filter, and their resulting tabulated magnitudes are the
averages of the individual measurements inversely weighted by the
squares of their errors.
The stars in these tables are from two regions: the central region
and a non-overlapping northern region. The latter are designated
by four digit numbers starting with 9. The X,Y coordinates are the
positions relative to the northwestern-most corner of each region.
The celestial coordinates have been calculated using full plate
solutions of a few dozen stars measured on ESO sky survey plates
and the X,Y coordinates from the catalogs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tbl4-5.dat 101 2395 Positional and photometric data
tbl11-12.dat 125 302 Spectroscopic data
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Byte-by-byte Description of file: tbl4-5.dat
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Bytes Format Units Label Explanations
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3- 6 I4 --- Num *Running number
9- 10 I2 h RAh Right ascension 2000
12- 13 I2 min RAm Right ascension 2000
15- 18 F4.1 s RAs Right ascension 2000
21 A1 --- DE- Declination sign 2000
22- 23 I2 deg DEd Declination 2000
25- 26 I2 arcmin DEm Declination 2000
28- 29 I2 arcsec DEs Declination 2000
33- 38 F6.2 pix X *X position
41- 47 F7.2 pix Y *Y position
51- 56 F6.3 mag V *V magnitude
60- 65 F6.3 mag B-V *B-V color
69- 74 F6.3 mag U-B *U-B color
79- 83 F5.3 mag e_V V accuracy
88- 92 F5.3 mag e_B-V B-V accuracy
97-101 F5.3 mag e_U-B *U-B accuracy
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Note on U-B: 99.000 indicates no value for U-B
Note on e_U-B: 9.000 indicates no U-B value
Note on Num: Stars without the suffix r are the Bluest (Q < -0.7) and
Brightest (V < 16) Stars in 30 Doradus.
Note on X, Y: coordinates are from the CCD finder charts in the reference
Pixel sizes (in X and Y columns) are approximately 0.49 arcsec/pixel.
Note on V, B-V, U-B: magnitudes and colors in the Johnson UBV system.
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Byte-by-byte Description of file: tbl11-12.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Num *Running number
6 A1 --- rej [r] An r indicates a star too faint or red
7- 8 I2 h RAh Right ascension 2000
10- 11 I2 min RAm Right ascension 2000
13- 16 F4.1 s RAs Right ascension 2000
19 A1 --- DE- Declination sign 2000
20- 21 I2 deg DEd Declination 2000
23- 24 I2 arcmin DEm Declination 2000
26- 27 I2 arcsec DEs Declination 2000
31- 35 F5.1 pix X *X position
39- 43 F5.1 pix Y *Y position
46- 50 F5.2 mag V *V magnitude
53- 57 F5.2 mag B-V *B-V color
60- 64 F5.2 mag U-B *U-B color
67- 71 F5.2 mag Q Q = (U-B) - 0.72(B-V)
75- 78 F4.2 mag E(B-V) *Color excess in B-V
81- 85 F5.2 mag Mv *Absolute magnitude
88- 91 F4.2 K Teff *Log effective temperature
93- 98 F6.2 mag Mbol *Bolometric magnitude
101-112 A12 --- Sp *Spectral type
115-125 A11 --- com *Comments
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Note on Num: Stars without the suffix r are the Bluest (Q < -0.7) and
Brightest (V < 16) Stars in 30 Doradus.
Note on X, Y: coordinates are from the CCD finder charts in the reference
Pixel sizes (in X and Y columns) are approximately 0.49 arcsec/pixel.
Note on V, B-V, U-B: magnitudes and colors in the Johnson UBV system.
Note on E(B-V): is the color excess calculated from Q as discussed
in Section 2 of Paper II.
Note on Mv: is the absolute V magnitude = V - Rv * E(B-V) - DM where
Rv = 3.1, and the distance modulus DM = 18.5 mag.
Note on Teff: is the log10 of the effective temperature, and is
calculated from Q or (B-V)0 as discussed in Section 3.1 of Paper II.
Note on Mbol: is the bolometric magnitude = Mv + BC, where BC is
calculated from Teff as discussed in Section 3.1 of Paper II.
Note on Sp: Sp. Type is the spectral type and luminosity class as
determined from spectroscopic observations. One colon ":"
indicates an uncertainty of one spectral subtype or luminosity
class, and two colons "::" indicate a larger uncertainty.
Note on com:
Comments are indicated by the following codes:
a --- strong / over-subtracted Balmer lines
b --- blend
c --- possible composite / spectrum contaminated by nearby star
e --- strong nebular emission in the Balmer lines
f --- foreground star
j,J --- has been observed by the author and the spectrogram appears in
Figure 6 or 7 of Paper I.
p --- peculiar (details in text of Paper I)
m,M --- has been observed by Melnick (1985, A&A, 153, 235)
w,W --- has been observed by Walborn (1986, IAU Symp. 116, 185; 1992 -
unpublished classifications) or Walborn & Blades (1987, ApJ,
323, L65)
z --- ZAMS O star
The uppercase letters "J", "M", "W", indicate the sources of the
spectral types listed in Column 14; two or all three letters
may be uppercase if they agree on the same classification.
References:
Paper I = Parker, J. Wm. 1993, AJ, 106, 560
Paper II = Parker, J. Wm. & Garmany, C. D. 1993, AJ, 106, 1471
Historical Notes:
* 17-May-1994: First archived
* 15-Mar-1995: Corrected reference (PASP 104) and standardized this file (CDS)
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(End) Nancy G. Roman [NASA/NSSDC/ADC] 17-May-1994