Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..724e&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, June 1988, p. 724-729. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
11
Binary Stars, Cepheid Variables, Companion Stars, Stellar Spectra, Main Sequence Stars, Stellar Mass
Scientific paper
Polaris has a spectroscopic orbit determined from an extensive series of observations as well as a more uncertain astrometric orbit. The determination of its mass and evolutionary state is of considerable interest because it is a low-amplitude classical Cepheid with unusual period and amplitude variations. In this study, IUE spectra are investigated to search for light from the companion. The spectra of Polaris from 1600 A to 3200 A are a good match for nonvariable supergiants of similar spectral type. The lack of any excess flux at the shortest wavelengths implies that a main-sequence companion must be later than A8 V. Although this is the most likely companion, the ultraviolet observations cannot rule out a white dwarf 15,000 K or cooler. Both these companions are consistent with either an evolutionary mass or a smaller pulsation mass for the Cepheid.
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