Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..514b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Aug.-Sept. 1980, p. 514-517.
Astronomy and Astrophysics
Astronomy
9
Interstellar Extinction, Polarimetry, Star Clusters, Stellar Spectrophotometry, Binary Stars, Mass Transfer, Open Clusters, Spectrum Analysis, Stellar Evolution, Stellar Mass, Stellar Spectra
Scientific paper
The colors of the blue straggler K1211 in the open cluster NGC 7789 have been redetermined and the reddening of the cluster has been reexamined in view of existing inconsistencies in the basic data. Two approaches were taken: (1) the reddening was calculated from the photometric indices alone, and (2) the spectral type was matched with the observed color or colors. As a result of reanalysis of cluster reddening, E(B-V) = 0.27 m, and (B-v)o = -0.08 have been adopted for K1211. If the star is evolving normally off the main sequence, it has a mass of about 3 solar masses in a cluster with turnoff mass about 1.5 solar mass. Thus, K1211 is just at or slightly beyond the limiting mass allowed in the simplest scenario in which blue stragglers are produced by binary mass transfer.
Breger Michel
Wheeler Justin C.
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