Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92...60a&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Feb.-Mar. 1980, p. 60-65.
Astronomy and Astrophysics
Astronomy
3
Astronomical Photography, Nebulae, Star Clusters, Stellar Spectra, H Beta Line, H Ii Regions, Light Curve, Shell Stars, Stellar Evolution, Stellar Magnitude, Ubv Spectra
Scientific paper
A small group of stars near the edge of the IC 1805 (W4) H II region has been studied partly for evidence of a physical association with the nebula. The two brightest stars have pronounced shell spectra and evidence of hydrogen emission lines. A B8 V star with weak Hg lines, two normal B stars, and four fainter stars in the field were studied. UBV, H-beta, and Stromgren four-color photometry of nine stars yield a reddening of E(B - V) = 0.54 m, a distance of 485 pc, and an age of not greater than 10 to the 7.4th yr. The two shell stars and two normal B stars fall on the ZAMS but the Hg star is either a multiple or foreground star and the three fainter stars are probably background stars. The group is not associated with the more distant (2200 pc) IC 1805.
Abt Helmut A.
Grauer Albert D.
Olsen E. H.
Perry Charles L.
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