J/AZh/85/794 UBVRHα photometry on 5 galaxies (Gusev+, 2008)
Age and interstellar absorption in young star-formation regions in the galaxies
NGC 1068, NGC 4449, NGC 4490, NGC 4631, and NGC 4656/57 derived from multicolor
photometry.
Gusev A.S., Myakutin V.I., Piskunov A.E., Sakhibov F.K., Khramtsova M.S.
<Astron. Zh. 85, 794 (2008)>
=2008AZh....85..794G 2008AZh....85..794G
=2008ARep...52..714G 2008ARep...52..714G
ADC_Keywords: H II regions ; Photometry, UBVRI ; Photometry, H-alpha
Abstract:
We have compared the results of multicolor UBVR and Hα
photometry for 169 young star-formation complexes in five galaxies
using a grid of evolutionary models for young star clusters. The ages
and interstellar absorptions are estimated for 102 star-formation
complexes with the standard uncertainties σt=0.30dex and
σAV=0.45mag. The accuracies of these parameters were verified
using numerical simulations.
Description:
Our multicolor photometry of young star-formation regions (giant HII
regions) was carried out in eight spectral bands centered on emission
lines, as well as in spectral intervals without emission lines (the
stellar continuum). The measurements were carried out by M.A. Smirnov
from frames obtained in 1966-1981 by I.I. Pronik and her colleagues at
the Crimean Astrophysical Observatory (Ukraine) using the 2.6-m Shain
Telescope with an electro-optical transducer (EOT).
Objects:
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RA (2000) DE Designation(s)
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02 42 40.8 -00 00 48 NGC 1068 = M 77
12 28 11.0 +44 05 33 NGC 4449 = UGC 7592
12 30 36.7 +41 38 27 NGC 4490 = UGC 7651
12 42 07.8 +32 32 27 NGC 4631 = UGC 7865
12 43 58.2 +32 10 09 NGC 4656 = UGC 7907
12 44 11.3 +32 12 19 NGC 4657 = IRAS F12416+3228
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 170 Photometry of star formation complexes (SFCs)
in galaxies
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See also:
J/ApJ/591/138 : Chandra X-ray sources of NGC 1068 (Smith+, 2003)
J/AJ/124/3157 : Velocities in NGC 4449 (Valdez-Gutierrez+, 2002)
J/A+A/305/74 : NGC 4565, 4656 + 5907 ROSAT observations (Vogler+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Galaxy Galaxy name
9- 11 A3 --- m_Galaxy [/57 ] For Galaxy = NGC 4556/57
13- 14 I2 --- HII Giant HII region number within the cluster
16- 20 F5.2 mag U-B ?=- U-B colour index
22- 26 F5.2 mag B-V ?=- B-V colour index
28- 32 F5.2 mag V-R ?=- V-R colour index
34- 38 F5.2 mag LCI ?=- Lyman continuum index (1)
40- 44 F5.2 mag Bmag B magnitude
46- 49 F4.1 arcsec D Size of the image of the object in the
Hα+[NII] filter
51- 54 F4.2 mag AV ? Interstellar absorption in V band
56- 59 F4.2 [yr] logt ? Age estimate
61- 64 F4.2 mag Delta ? Error in the colours corrected for the
interstellar absorption (2)
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Note (1): LCI=2-log(F(Ha+[NII])/F(B)), where F(Ha+[NII] is the flux in
close hydrogen and nitrogen emission lines and F(B) the flux in the
stellar continuum in the B Band.
Note (2): Error is deviations of color indices corrected for interstellar
absorption from theoretical color indices for the nearest node of
evolutionary model grid.
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(End) Veta Avedisova [INASAN], Patricia Vannier [CDS] 13-Oct-2008