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New and old roles for narrowband Hα

Published online by Cambridge University Press:  21 October 2010

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
Copyright
Copyright © International Astronomical Union 2010

References

Drew, J. E. et al. 2005, MNRAS 362, 753CrossRefGoogle Scholar
Drew, J. E., Greimel, R., Irwin, M. J., & Sale, S. E. 2008, MNRAS 386, 1761CrossRefGoogle Scholar
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Parker, Q. A. et al. 2005, MNRAS 362, 6899CrossRefGoogle Scholar
Parker, Q. A. et al. 2006, MNRAS 373, 79CrossRefGoogle Scholar
Sale, S. E. et al. 2009, MNRAS 392, 497CrossRefGoogle Scholar
Witham, A. R. et al. 2008, MNRAS 369, 581CrossRefGoogle Scholar
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