H II regions and the extinction of Cepheids in NGC 2403

Details H II regions and the extinction of Cepheids in NGC 2403 H II regions and the extinction of Cepheids in NGC 2403

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..801m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, April 15, 1984, p. 801-808. Research supported by

Astronomy and Astrophysics

Astronomy

7

Cepheid Variables, H Ii Regions, Interstellar Extinction, Reference Stars, Spectrophotometry, Spiral Galaxies, Astrometry, Balmer Series, Cosmic Dust, Distance

Scientific paper

Spectrophotometric observations of H II regions can be used to constrain the extinction of Population I objects in external galaxies. An analysis of NGC 2403 reveals that the Cepheids used to determine the distance are reddened on average by less than 0.2 mag. Either they are redder intrinsically than the Cepheids used to calibrate the PLC relation, or their photometry suffers from systematic errors.

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