J/AJ/106/56 HII regions in NGC 6814 (Knapen+, 1993)
Statistics and properties of HII regions in NGC 6814 KNAPEN J.H., ARNTH-JENSEN N., CEPA J., BECKMAN J.E. <Astron. J. 106, 56 (1993)> =1993AJ....106...56K (SIMBAD/NED Reference)
ADC_Keywords: Galaxies, optical; H II regions; Positional data Abstract: We present a new Halpha image of high quality of the grand-design galaxy NGC 6814, and describe statistical properties of the HII region population. We have determined positions, angular sizes, and calibrated fluxes of 735 individual HII regions. We construct luminosity functions (LFs) for the complete sample, separately for arm and interarm regions, and for HII regions within and outside the limiting radius corresponding to the bright optical disk. The slope of the LF for the complete sample agrees well with values published for other Sbc and Sc galaxies. LFs for HII regions in the arms, in the interarm regions, in the inner part, and in the outer part of the galaxy all have the same slopes. We show and discuss the diameter distribution of the HII regions, both for the complete sample and for the separate arm, interarm, inner, and outer disk samples. There is no evidence for a different population of HII regions in the spiral arms, nor is there evidence for the existence of a significant population of density-bounded HII regions. We discuss implications for massive star forming processes in this galaxy, and discuss possible differences from other grand-design spirals. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table 48 735 HII regions. This table lists the 735 HII regions catalogued in the disk of the grand-design spiral galaxy NGC 6814, using a new H alpha image. The center is also included in the list.
Byte-by-byte Description of file: table
Bytes Format Units Label Explanations
1- 3 I3 --- ID Identification number of the HII region. HII regions closely grouped in the galaxy have generally closely grouped numbers. 5- 12 F8.2 arcsec dRA Right ascension offset from the nucleus. Not corrected for inclination of the galaxy. 13- 20 F8.2 arcsec dDE Declination offset from the nucleus. 21- 27 F7.1 arcsec Dist Deprojected distance from the center. An inclination angle of 20 degrees and a position angle of PA=167 degrees were used for the deprojection. 28- 34 F7.2 arcsec DHII Diameter of the HII region 35- 45 F11.4 [10-7J/s] log(LHII) HII region total integrated luminosity 48 A1 --- THII [CAIO] Type assigment given to the HII region. See note (1)
Note (1): Notes as follows: C = center (not an HII region, but included for comparison) A = Arm HII region I = interarm O = outer HII region An outer HII region is defined as lying outside the area of the strong spiral arms, d>43 arcsec or 0.4 R25.
Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 25-Jul-1994
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