AAS 205th Meeting, 9-13 January 2005
Session 93 Dwarf Galaxies
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

Previous   |   Session 93   |   Next

[93.01] WIYN observations of And IX: A metal poor, low-mass dSph Galaxy

D. Harbeck (UC Berkeley, SSL), E. Grebel (Uni Basel), J. Gallagher (UW Madison), A. Koch (Uni Basel), D. Zucker (MPIA)

We present WIYN follow-up observations of the recently discovered And IX dwarf spheroidal (dSph) satellite galaxy of M\,31. Our data obtained at a natural seeing of 0.5'' confirms And IX as an dSph galaxy with a distance similar to M\,31. There is no evidence for an intermediate-age (1-10\,Gyr) stellar population in And IX. From the red giant branch we determine a metallicity of order of -2 dex, letting the low-mass And IX fit well into the luminosity-metallicity relation of Local Group dSph galaxies. We conclude that And IX is indeed an extremely faint, low mass of member the Local Group and discuss implications for dwarf galaxy formation.

Previous   |   Session 93   |   Next

Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.