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J/AJ/127/1982       HST UBVI photometry of NGC 3081 inner regions  (Buta+, 2004)

A Hubble space telescope study of star formation in the inner resonance ring of NGC 3081. Buta R.J., Byrd G.G., Freeman T. <Astron. J., 127, 1982-2001 (2004)> =2004AJ....127.1982B
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, Cousins Keywords: galaxies: individual (NGC 3081) - galaxies: photometry - galaxies: spiral - galaxies: structure Abstract: We present Hubble Space Telescope Wide Field Planetary Camera 2 images of the inner regions of NGC 3081, an absolute magnitude MB=-20.0 early-type barred spiral having four well-defined resonance rings: a nuclear ring, an inner ring, an outer R1 ring, and an outer R'2 pseudoring. Here we focus on a photometric study of the inner ring, a feature likely associated with an inner 4:1 resonance near the ends of the bar. The ring is notable for its high contrast and sharp definition, which is due to a significant degree of active star formation. The ring is also notable for its significant intrinsic elongation and parallel alignment with the bar. Description: The Hubble Space Telescope (HST) observations of NGC 3081 were secured on 2000 June 25 with the Wide Field Planetary Camera 2 (WFPC2). The center of the galaxy was placed near the overlap section between WFPC2 sections WF3 and WF4. Five broadband filters were used to observe the galaxy: F255W, F336W, F439W, F555W, and F814W. The latter four filters are intended to approximate Johnson U, B, V, and Cousins I photometric systems, respectively, while F255W is a mid-ultraviolet filter. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 09 59 29.5 -22 49 35 NGC 3081 = IC 2529 ------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 72 58 Photometry of ring sources brighter than V=23.6
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [BBF2004] Sequential number 4- 9 F6.2 arcsec DXpos Offset along X axis from nucleus (1) 11- 16 F6.2 arcsec DYpos Offset along Y axis from nucleus (1) 18- 22 F5.2 mag V0mag Dereddened V magnitude (2) 24- 27 F4.2 mag e_V0mag rms uncertainty on V0mag 29- 33 F5.2 mag (U-B)0 Dereddened U-B colour index (2) 35- 38 F4.2 mag e_(U-B)0 rms uncertainty on (U-B)0 40- 44 F5.2 mag (B-V)0 Dereddened B-V colour index (2) 46- 49 F4.2 mag e_(B-V)0 rms uncertainty on (B-V)0 51- 55 F5.2 mag (V-Ic)0 Dereddened Cousins V-I colour index (2) 57- 60 F4.2 mag e_(V-Ic)0 rms uncertainty on (V-Ic)0 62- 67 F6.2 mag VMAG Absolute V magnitude, if the object is part of NGC 3081 69- 72 F4.2 mag DV(0.5-3) Concentration parameter (3)
Note (1): DXpos is westward while positive, DYpos is northward Note (2): Magnitudes and colors corrected only for Galactic extinction. Note (3): Concentration parameter, defined as the difference in V magnitude between a 0.5 pixel radius and a 3 pixel radius aperture. Some of the objects with ΔV<1.78 are likely to be foreground stars.
History: From electronic version of the journal
(End) James Marcout, Patricia Vannier [CDS] 02-Jul-2004
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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