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J/ApJ/446/622         UV and optical imagery of LH 52 and LH 53 (Hill+ 1995)

UIT and optical imagery of Large Magellanic cloud associations LH 52 and LH 53: ages and initial mass function slopes Hill R.S., Cheng K.-P., Bohlin R.C., OConnell R.W., Roberts M.S., Smith A.M., Stecher T.P. <Astrophys. J. 446, 622 (1995)> =1995ApJ...446..622H
ADC_Keywords: Magellanic Clouds ; Clusters, open ; Photometry, ultraviolet Misson_Name: Astro-1 Keywords: dust, extinction - Magellanic Clouds - open clusters and associations: individual (LH 52, LH 53) - stars: luminosity function, mass function - ultraviolet: stars Abstract: A 40' field including the stellar associations LH 52 and LH 53 and the supernova remnant N49 in the Large Magellanic Cloud was observed by the Ultraviolet Imaging Telescope (UIT) during the Astro-1 Space Shuttle mission in 1990 December. The image in the 162 nm bandpass is discussed together with ground-based BV data on subfields containing LH 52 and LH 53. Point-spread function photometry in the 162nm, B, and V bands is presented in the form of color-magnitude diagrams and two-color diagrams, which are compared with stellar models. The far-ultraviolet extinction curve of the dust in LH 52 is unusually steep for the LMC. The most probable age of both associations is ∼10 Myr, which constrains the scenario for the evolution of the supergiant Halpha shell LMC 4 by stochastic self-propagated star formation. The initial mass function (IMF) slope for LH 52 is Gamma~-1, in agreement with previous work, and the slope for LH 53, which is less densely populated, is Gamma~-2. A similar relationship between surface density of stars and IMF slope is reported for a UIT field near 30 Dor. The ultraviolet morphology of N49, which is contained in LH 53, is dominated by two bright features that straddle an X-ray bright spot, consistent with an encounter between the blast wave and a cloud. The estimated age of ∼10Myr for LH 53 implies an initial mass of ∼20M for the N49 progenitor star. Objects: ------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------ 05 24 -66 24 LH 52 = NGC 1948 05 26 -66 14 LH 53 ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 99 122 Ultraviolet sources in LH 52 table3.dat 118 201 Ultraviolet sources in LH 53 lh52_bv.dat 60 1048 BV photometry of LH 52 lh53_bv.dat 60 2227 BV photometry of LH 53
Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID *Identification 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declinatin sign 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 36 F7.2 mag m162 *Magnitude at 162nm 38- 44 F7.3 mag e_m162 DAOPHOT-type internal error in m162 46- 52 F7.2 mag Bmag ?=99.99 Calibrated B magnitude 54- 60 F7.3 mag e_Bmag ?=99.999 DAOPHOT-type internal error in Bmag 62- 68 F7.2 mag Vmag ?=99.99 Calibrated V magnitude 70- 76 F7.3 mag e_Vmag ?=99.999 DAOPHOT-type internal error in V 78- 99 A22 --- Remark Remark on dup. matches or UIT image quality
Note on ID: IDs are derived from UIT photometry. Duplicates mean the same ultraviolet source had more than one candidate match on the B image, and the author could not decide between them. However, coordinates are based on the B sources and can thus differ between two appearances of the same ID. Note on m162: m162 = -2.5*alog10(f_B5) - 21.1, where f_B5 is the mean flux in the UIT B5 bandpass in mW/m2/(0.1nm); the B5 centroid wavelength is approximately 162nm.
Byte-by-byte Description of file: lh52_bv.dat lh53_bv.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID Identification derived from V photometry 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 36 F7.2 mag Bmag B magnitude 38- 44 F7.3 mag e_Bmag DAOPHOT-like internal error 46- 52 F7.2 mag Vmag V magnitude 54- 60 F7.3 mag e_Vmag DAOPHOT-like internal error
Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 10-Oct-95
(End) [CDS] 29-Jan-1996
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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