Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-07-04T21:14:21.974Z Has data issue: false hasContentIssue false

The Temperatures and Pulsation Modes of 9-day Cepheids

Published online by Cambridge University Press:  25 April 2016

A. W. Rodgers
Affiliation:
Mount Stromlo Observatory, Australian National University, Canberra
R. A. Bell
Affiliation:
Mount Stromlo Observatory, Australian National University, Canberra

Extract

It can be shown that cepheids pulsating in the first harmonic when evolving through the instability zone at constant bolometric luminosity and mass, are at a given period 0.09 magnitudes bluer than stars pulsating in the fundamental mode. Bell and Rodgers have shown that effective temperatures of cepheids can be obtained by comparison of observed and computed profiles of the wings of the Hα line. Hα cores of cepheids are affected by strongly doppler broadened chromospheric emission and absorption. Using a modified Oke effective temperature-intrinsic colour relation, observations of the Hα line of the Eggen C cepheids β Dor and S Mus have been made at Mt. Stromlo and intrinsic colours obtained for these stars.

Type
Contributions
Copyright
Copyright © Astronomical Society of Australia 1967

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)