Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-22
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures; STScI mini-workshop "When and How do Bulges Form and Evolve?", September 1998, ed. C. M. Carollo and H. Fe
Scientific paper
We present first results from an on-going survey of the stellar populations of the bulges and inner disks of spirals at various points along the Hubble sequence. In particular, we are investigating the hypotheses that bulges of early-type spirals are akin to (and may in fact originally have been) intermediate-luminosity ellipticals while bulges of late-type spirals are formed from dynamical instabilities in their disks. Absorption-line spectroscopy of the central regions of Sa--Sd spirals is combined with stellar population models to determine integrated mean ages and metallicities. These ages and metallicities are used to investigate stellar population differences both between the bulges and inner disks of these spirals and between bulges and ellipticals in an attempt to place observational constraints on the formation mechanisms of spiral bulges.
Dalcanton Julianne J.
Trager Scott Charles
Weiner Benjamin J.
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