Spectra of Post-AGB Stars in the Halo of M31

Details Spectra of Post-AGB Stars in the Halo of M31 Spectra of Post-AGB Stars in the Halo of M31

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20311609s&link_type=abstract

American Astronomical Society Meeting 203, #116.09; Bulletin of the American Astronomical Society, Vol. 35, p.1398

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a photometric system that combines the Gunn-Thuan u filter with the standard BVI filters, we have identified more than two dozen candidate post-asymptotic-giant-branch (PAGB) A- and F-type stars in the halo of M31. In order to confirm that these are indeed M31 stars with extremely large Balmer jumps, we have obtained moderate-resolution spectra of a sample of the candidates, using the 6.5-m MMT blue channel spectrograph. The vast majority of the PAGB candidates are indeed extremely low-gravity A-F stars with radial velocities suggestive of M31 membership; only one ``interloper'' was a high-z QSO. At V≃21, these are the visually brightest stars in the M31 halo, and they show great utility both as halo tracers and as standard extragalactic candles.

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