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Issue A&A
Volume 435, Number 3, June I 2005
Page(s) 821 - 829
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041138



A&A 435, 821-829 (2005)
DOI: 10.1051/0004-6361:20041138

The star formation history of the LSB galaxy UGC 5889

A. Vallenari1, L. Schmidtobreick2 and D. J. Bomans3

1  Astronomical Observatory of Padova, Vicolo dell' Osservatorio 5, 35122 Padua, Italy
2  European Southern Observatory, Casilla 19001, Santiago 19, Chile
3  Astronomisches Institut der Ruhruniversität Bochum, 44780 Bochum, Germany
    e-mail: vallenari@astrpd.pd.astro.it

(Received 21 April 2004 / Accepted 24 January 2005 )

Abstract
We present HST photometry of the LSB galaxy UGC 889 and derive its recent star formation history. In the last 200 Myr the star formation proceeded in modest bursts at a rate of the order of 10-2-10-3 $M_{\odot}$/yr, with periods of extremely low SFR or even quiescence. The rate derived from the present study for the last 20 Myr is in agreement with the H$_\alpha$ emission from the galaxy. The presence of a consistent population older than 200 Myr is suggested by the data. However, observational errors and completeness correction prevent any firm conclusion on the oldest age. The total mass of stars is of the order of 5.5  $\times 10^7$ $M_{\odot}$. Even if the recent episodes of star formation have heated the gas and carved a hole in the disk, blow-away of the gas is unlikely to occur.


Key words: stars: formation -- galaxies: stellar content -- ISM: bubbles -- stars: AGB and post-AGB

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