A small cluster near IC 1805.
Abstract
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.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- February 1980
- DOI:
- 10.1086/130615
- Bibcode:
- 1980PASP...92...60A
- Keywords:
-
- Astronomical Photography;
- Nebulae;
- Star Clusters;
- Stellar Spectra;
- H Beta Line;
- H Ii Regions;
- Light Curve;
- Shell Stars;
- Stellar Evolution;
- Stellar Magnitude;
- Ubv Spectra;
- Astronomy