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New and old roles for narrowband Hα

Published online by Cambridge University Press:  21 October 2010

Janet E. Drew
Janet E. Drew*
Affiliation:
CAR/STRI, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK
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Abstract

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Until recently, Hα has been seen as the tracer of ionized gas, picking out both star formation and the late stages of stellar evolution. This has been reaffirmed, spectacularly, by the recent WHAM and SHS surveys. But the advent of large-area digital detectors creates a new role for narrowband Hα as a direct, simultaneous, measure of intrinsic stellar colour and reddening when e.g. r'-Hα is combined with a nearby broad band colour e.g. r'- i'. This new capability has been clearly demonstrated by the nearly-complete IPHAS survey.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 778
Copyright
Copyright © International Astronomical Union 2010

References

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