NOAO > Library > NOAO Preprint Series > Preprint 898
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NOAO > Library > NOAO Preprint Series > Preprint 898 |
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Author(s): Pritzl, B.J., Armandroff, T.E., Jacoby, G.H., and Da Costa, G.S.
Title: The Dwarf Spheroidal Companions to
M31:
Variable Stars in Andromeda VI
Abstract:
We have surveyed Andromeda VI, a dwarf spheroidal galaxy companion to M31, for
variable stars using F450W and F555W observations obtained with the Hubble
Space
Telescope. A total of 118 variables were found, with 111 being RR Lyrae, 6
anomalous Cepheids, and 1 variable we were unable to classify. We find that
the
Andromeda VI anomalous Cepheids have properties consistent with those of
anomalous Cepheids in other dwarf spheroidal galaxies. We revise the existing
period-luminosity relations for these variables. Further, using these and
other
available data, we show that there is no clear difference between fundamental
and first-overtone anomalous Cepheids in a period-amplitude diagram at shorter
periods, unlike the RR Lyrae. For the Andromeda VI RR Lyrae, we find that they
lie close to the Oosterhoff type I Galactic globular clusters in the
period-amplitude diagram, although the mean period of the RRab stars,
Date Received:
May 22, 2002
Publication Info:
AJ 124:1464-1485
Downloadable version (4796 Kb PDF)
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NOAO > Library > NOAO Preprint Series > Preprint 898 |
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