J/A+A/391/857 HST UV,V,I photometry of NGC7673 star clusters (Homeier+, 2002)
The star cluster system of the NGC 7673 starburst.
Homeier N., Gallagher III J.S., Pasquali A.
<Astron. Astrophys. 391, 857 (2002)>
=2002A&A...391..857H 2002A&A...391..857H
ADC_Keywords: Galaxies, photometry ; Clusters, open ; Photometry, ultraviolet
Keywords: galaxies: evolution - galaxies: starburst -
galaxies: individual: NGC 7673 - galaxies: interactions -
galaxies: star clusters
Abstract:
We investigate the star cluster system in the starburst galaxy
NGC 7673 using archival Hubble Space Telescope WFPC2 broad-band
images. For the first time we are able to examine the internal
structures of the prominent optical clumps in this galaxy. The clumps
are composed of young stars, 16-33% of which are in bright star
clusters. We identify 268 star cluster candidates in both the F555W
and F814W images, and 50 clusters with the F255W filter. These data
allow us to estimate ages and masses using color-magnitude and
two-color diagrams for our sample. We find a population of young,
<6Myr clusters located throughout the galaxy with concentrations in
the clumps. Star cluster mass estimates are 5-50x104M☉ for the
brightest objects. The starburst remains active in physically
well-separated regions, indicating a widespread starburst trigger. We
discuss clump lifetimes, their implications for the future evolution
of NGC 7673, and possible relationships to high redshift starbursts.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 71 50 Parameters for clusters detected in the
F255W (UV), F555W (V) and F814W (I) filters
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- [HGP2002] Cluster designation
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 (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 35 F5.2 mag [255-555] Colour index [F255W-F555W] ([UV-V])
37- 40 F4.2 mag e_[255-555] rms uncertainty on [255-555]
42- 46 F5.2 mag [555-814] Colour index [F555W-F814W] ([V-I])
48- 51 F4.2 mag e_[555-814] rms uncertainty on [555-814]
53- 57 F5.2 mag F555Wmag F555W magnitude (Vmag)
59- 62 F4.2 mag e_F555Wmag rms uncertainty on F555Wmag
64- 70 A7 --- Region Region (1)
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Note (1): Region designations:
Clump B, Clump C, Nuclear or field.
Clumps are labeled following the notation of Duflot-Augarde & Alloin
(1982A&A...112..257D 1982A&A...112..257D).
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 08-Oct-2002