Photometric Variability of Helium Stars in the Z-bump Instability Strip

Bibcode
2000ASPC..203..438A
Aznar Cuadrado, R.; Montañés Rodríguez, P.; Jeffery, C. S.; Pollacco, D.
Bibliographical reference

The Impact of Large-Scale Surveys on Pulsating Star Research, ASP Conference Series, Vol. 203; also IAU Colloquium #176. Edited by L. Szabados and D. Kurtz. ISBN: 1-58381-030-7 (2000), p.438-439

Advertised on:
0
2000
Number of authors
4
IAC number of authors
0
Citations
1
Refereed citations
1
Description
Z-bump opacities are known to excite radial pulsations in helium stars with 102~<= L/M~<=104 and Teff ~ 25 000 K. Well-studied cases are V652 Her and BX Cir. The absence of variations in the metal-poor star HD 144941 demonstrates the importance of Z-bump opacitiesto drive these pulsations. Several other helium-rich stars lie close to the theoretical blue-edge of the Z-bump instability strip. One of these, LS IV+6o2, is a known radial velocity variable. We report on recent (1999 June) observations of two helium stars close to the Z-bump instability boundary. Both appear to be variable.
Type
Non-refereed

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