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Starbursts in the Irregular Galaxy VV 523

Published online by Cambridge University Press:  10 November 2010

G. Tenorio-Tagle
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
J. Hecquet
Affiliation:
Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
R. Augarde
Affiliation:
Observatoire de Marseille, 2 place Le Verrier, F-13248 Marseille cedex 4, France
G. Coupinot
Affiliation:
Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
M. Aurière
Affiliation:
Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
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Summary

Introduction

VV 523 (= NGC 3991 – UGC 6933 – IRAS11549+3237) is a typical clumpy irregular galaxy. Its distance is 42.6 Mpc, its absolute blue magnitude is −20.2 and its UB index –0.44. On CCD frames taken at the Bernard Lyot 2-m telescope of the Observatoire du Pic-du- Midi VV 523 shows a complex structure with three components of bright clumps scattered in a common envelope. The extension of the envelope is 80″ × 2″ within a surface brightness of 25 mag arcsec−2.

Observations

Three filters (B, R and I) were used for the CCD observations. The seeing was about 1 arcsecond. A wavelet transform with a scale parameter suited to the size of the starforming cells was used to detect the clumps and to provide their size, location and colour indexes. Figure 1 shows the wavelet transform of the B image. The photometric results are in Table 1. The clumps have a mean size of 200 parsecs and the BI indexes exhibit a sequence in colour which corresponds to their location in the galaxy.

Long-slit spectra with a dispersion of 33 and 260 Å mm−1 were recorded with the Carelec spectrograph at the 1.93-m telescope of the Observatoire de Haute Provence. The spectra show strong emission lines typical of HII regions. Three regions of different intensities are detected and named A, B and C. In Table 1 we give the physical properties of each of the three regions.

Type
Chapter
Information
Violent Star Formation
From 30 Doradus to QSOs
, pp. 317 - 318
Publisher: Cambridge University Press
Print publication year: 1994

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  • Starbursts in the Irregular Galaxy VV 523
    • By J. Hecquet, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, R. Augarde, Observatoire de Marseille, 2 place Le Verrier, F-13248 Marseille cedex 4, France, G. Coupinot, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, M. Aurière, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.056
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  • Starbursts in the Irregular Galaxy VV 523
    • By J. Hecquet, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, R. Augarde, Observatoire de Marseille, 2 place Le Verrier, F-13248 Marseille cedex 4, France, G. Coupinot, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, M. Aurière, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.056
Available formats
×

Send book to Google Drive

To send content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive.

  • Starbursts in the Irregular Galaxy VV 523
    • By J. Hecquet, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, R. Augarde, Observatoire de Marseille, 2 place Le Verrier, F-13248 Marseille cedex 4, France, G. Coupinot, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France, M. Aurière, Observatoire du Pic-du-Midi, U.R.A. 1281 du CNRS, F-65200 Bagnères de Bigorre, France
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.056
Available formats
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