Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0905s&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #09.05; Bulletin of the American Astronomical Society, Vol. 28, p.836
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used the Hubble Space Telescope to observe the resolved stars of the nearby (D = 1.4 Mpc) dwarf irregular galaxy Sextans A. The data consist of WF/PC2 images in 3 bands: F439W (1 hour), F555W (30 minutes), and F814W (30 minutes). The stellar photometry was extracted using the DoPHOT program developed by Schechter, Mateo & Saha (1993, PASP, 105, 1342) with modifications for WF/PC2 data by Saha et al. (1996, ApJ, submitted). From this photometry, we were able to construct color-magnitude diagrams (CMD) and color-color diagrams down to a limiting magnitude of 26 in V. The CMD shows excellent detail. The main sequence, blue-loop stars, red supergiants, and red giant branch are all clearly distinct distributions in the CMDs. From these diagrams, we can constrain the star formation history of Sextans A through a statistical comparison with stellar evolution models.
Chiosi Cesare
Dohm-Palmer Robbie C.
Dufour Reginald James
Gallagher John Jay
Hoessel John
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