The blue compact dwarf galaxy UGC 6456 resolved into single stars with HST

Details The blue compact dwarf galaxy UGC 6456 resolved into single stars with HST The blue compact dwarf galaxy UGC 6456 resolved into single stars with HST

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..395s&link_type=abstract

The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 395-402 (1997).

Astronomy and Astrophysics

Astronomy

1

Dwarf Galaxies, Characteristics And Properties Of External Galaxies And Extragalactic Objects, Astronomical Observations

Scientific paper

We present single-star photometry for the blue compact dwarf galaxy UGC 6456 (=VII Zw 403), imaged with the HST/WFPC2 in F336W, F555W, F814W, and F656N (i.e., U, V, I, and Hα). Whereas ground-based, large telescope images of UGC 6456 resolved a few tens of objects in this galaxy, DAOPHOT/ALLSTAR finds several thousand pointlike sources with signals larger than 3 σ above the background noise in the V-band HST/PC image alone. As expected, a young population of massive stars is indicated from the Hα as well as the broad-band images. However, more interesting is the evidence for a much older stellar population in this galaxy; the color-magnitude diagrams show the presence of blue supergiants, main-sequence stars, and blue-loop stars, but also of red supergiants, asymptotic giant branch and red giant stars. The features in the V-I color-magnitude diagram known as the ``red-tail'' and the brightest part of the ``red-tangle'' specifically suggest intermediate-age (and possibly old) stars. Therefore, UGC 6456 is clearly not undergoing its first burst of star formation at the present epoch.

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