Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..572p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 572-582.
Other
23
Hot Stars, R Coronae Borealis Stars, Stellar Spectra, Stellar Spectrophotometry, Color-Magnitude Diagram, Line Spectra, Power Spectra, Spectrum Analysis
Scientific paper
The first observations of the short-term photometric behavior of the hot R CrB star DY Cen along with spectroscopic data are presented. Analysis of the latter yields nH less than 0.9 nHe and T(eff) = (14,000 + or - 1500) K, while the star has been found to exhibit low-amplitude, short-period (3.8-5.5 d) photometric variations superimposed on one of much longer duration (longer than 25 d). Provided DY Cen is extremely hydrogen-deficient, and these variations may be interpreted as radial pulsations, then L of about 13,000-18,000 solar luminosities and M of about 0.71-0.78 solar mass are implied. The long-term variation cannot be interpreted within the framework of the period-temperature law for hydrogen-deficient stars. The classification criteria and evolutionary status of the hot R CrB stars are reviewed and, in this context, it is shown that DY Cen displays marked differences compared to the other members, indicating a different evolutionary status for this object. The star's physical properties are intermediate between the Extreme Helium stars and the classical R CrB stars and, hence, may represent a unique transition object between these groups.
Hill Philip W.
Pollacco Don L.
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