Cepheid temperature scale

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6913552

Teays, T J

In this study the temperatures of Cepheid variable stars are determined by obtaining their energy distributions, using the technique of spectrum scanning. The observations were obtained with Kitt Peak National Observatory's Intensified Reticon Scanner and Cerro Tololo Inter-American Observatory's two-channel scanner. Six well-observed Cepheids in galactic open clusters were examined at various phases of their pulsation cycles. Recently determined color excesses, based on the uvby photometry of Schmidt, were used to scale the reddening curves of Nandy and thereby correct the scans for the effects of interstellar reddening. The temperature of each energy distribution was found by matching them to the emergent flux calculated from Kurucz's model atmospheres. B-V color curves, taken from the literature, were used to establish the color index of the Cepheids at the phases for which temperatures were measured. A linear least-squares fit to these data yielded the color temperature relation: Log T/sub eff/ = 3.904 - 0.237 (B-V)/sub 0/.

• Research Organization: Nebraska Univ., Lincoln (USA)
• OSTI ID: 6913552
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CEPHEIDS
COLOR
ENERGY SPECTRA
GALAXY CLUSTERS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
PULSATING VARIABLE STARS
SPECTRA
STARS
TEMPERATURE MEASUREMENT
VARIABLE STARS