Other
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1132t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 3, Sept. 1992, p. 1132-1143. Research supported by NSERC.
Other
28
Cepheid Variables, Galactic Clusters, Ubv Spectra, Astronomical Photometry, B Stars, Interstellar Extinction, Stellar Luminosity
Scientific paper
The paper presents new photoelectric UBV photometry of 27 stars and spectroscopic observations of 12 stars for NGC 129, the cluster containing the 8.00-d Cepheid DL Cas. The photometry is used to restandardize previously published photoelectric and photographic observations of stars in NGC 129, including transformed Stromgren system data. A compilation of the best available photometric data for stars with V less than 15.3 is used in conjunction with published proper motion data and spectroscopic observations of the brighter stars for a detailed cluster analysis. The newly obtained distance modulus of NGC 129 is 11.11 +/-0.02 s.e., and a value of 3.20 +/-0.30 s.e. is found to describe the dust extinction in the field. A list of 94 candidate cluster members is presented, and a cluster radial velocity of -36.0 +/-1.8 km/s is derived using the supergiants and bright B stars. The membership status of the supergiants is discussed in connection with other available information for cluster stars.
Forbes Douglas
Pedreros Mario
Turner David G.
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