Deep Photospheric Emission Lines as Probes for Pulsational Waves
Abstract
Weak line emission originating in the photosphere is well known from O stars and widely used for luminosity classification. The physical origin of the line emission are NLTE effects, most often optical pumping by far-UV lines. Analogous lines in B stars of lower luminosity are identified in radially pulsating β Cephei stars. Their diagnostic value is shown for radially pulsating stars, as these lines probe a much larger range of the photosphere than absorption lines, and can be traced to regions where the pulsation amplitude is much lower than seen in the absorption lines.
- Publication:
-
New Windows on Massive Stars
- Pub Date:
- January 2015
- DOI:
- 10.1017/S1743921314006826
- arXiv:
- arXiv:1407.8133
- Bibcode:
- 2015IAUS..307..228R
- Keywords:
-
- stars: oscillations;
- stars: atmospheres;
- stars: individual (ξ<SUP>1</SUP> CMa;
- BW Vul);
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Contributed paper to appear in Proc. IAU307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry, Editors: G. Meynet, C. Georgy, J.H. Groh &