Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars

Details Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..351l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 2/NOV15, P. 351, 1993

Other

11

Stars: Chemically Peculiar - Stars: Evolution - Hertzsprung-Russell (Hr) Diagram - Stars: Variables: Other

Scientific paper

A photometric and radial velocity survey of the six coolest extreme helium (eHe) stars confirms that at least five, and probably all, of these objects are both photometric and radial velocity variables. The stars have photometric variations on time-scales ranging from 8 to perhaps 25 d, and radial velocity amplitudes of 6 to 20 km s-1. In at least one case the variations appear to indicate that the star is pulsating in a radial mode.
The pulsational characteristics of these objects appear to represent a direct extension of the cool, hydrogen-deficient carbon star sequence to higher temperatures. Known eHe stars range in effective temperature (Teff) from 8400 to 55 000 K. The six stars included in the survey have Teff of 8400 to 12400 K. The periods and temperatures of these stars are consistent with evolutionary models for hydrogen-deficient carbon stars evolved through the region of the HR diagram occupied by the cooler R Coronae Borealis (RCB) and hydrogen-deficient carbon (HdC) stars (Teff range of 5000 to 7500 K) to the eHe star region.

Affiliated with

Also associated with

No associations

Rating

Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Luminosity and Radial Velocity Variations of the Six Coolest Extreme Helium Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-811470