Reddening-distances for late-type stars from broad-band BVI(c) CCD imaging

Details Reddening-distances for late-type stars from broad-band BVI(c) CCD imaging Reddening-distances for late-type stars from broad-band BVI(c) CCD imaging

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..228p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 15, 1992, p. 228-246.

Astronomy and Astrophysics

Astronomy

13

Interstellar Extinction, Late Stars, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Distance, Planetary Nebulae, Star Clusters, Stellar Spectra

Scientific paper

If the zero-age main sequence is expressed in the (V-I) versus (B-V)-(V-I) plane, the reddening lines are found to lie at a great enough angle to allow reasonably accurate spectral-type classification for stars later than about F5. Earlier spectral types can also be identified but with lower accuracy. Comparisons with the Q method of UBV photometry with spectra of some of the program stars show that the BVI(c) technique produces reliable results. As late-type stars constitute the most numerous spectral types and are plentiful in all galactic-plane directions, BVI(c) reddening-distances can be derived close to the desired direction (although to smaller distances than techniques that utilize early-type stars). The applicability of the technique is further enhanced by the use of CCDs which generally have a spectral response well suited for BVI(c) imaging observations. Using the new technique, the distance to the PN NGC 2440 was found to be (3100 +/- 320) pc.

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