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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
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