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LINE-PROFILE VARIABILITY FROM TIDAL FLOWS IN ALPHA VIRGINIS (SPICA)
- Source :
- The Astrophysical Journal. 704:813-830
- Publication Year :
- 2009
- Publisher :
- American Astronomical Society, 2009.
-
Abstract
- We present the results of high precision, high resolution (R~68000) optical observations of the short-period (4d) eccentric binary system Alpha Virginis (Spica) showing the photospheric line-profile variability that in this system can be attributed to non-radial pulsations driven by tidal effects. Although scant in orbital phase coverage, the data provide S/N>2000 line profiles at full spectral resolution in the wavelength range delta-lambda = 4000--8500 Angstroms, allowing a detailed study of the night-to-night variability as well as changes that occur on ~2 hr timescale. Using an ab initio theoretical calculation, we show that the line-profile variability can arise as a natural consequence of surface flows that are induced by the tidal interaction.<br />Accepted in ApJ, Version 2 reformatted figure layout
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
Stellar rotation
Ab initio
Stellar atmosphere
FOS: Physical sciences
Astronomy and Astrophysics
Spica
Astrophysics
01 natural sciences
Stars
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
0103 physical sciences
Astrophysics::Earth and Planetary Astrophysics
Spectral resolution
Astrophysics - Instrumentation and Methods for Astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Line (formation)
Dimensionless quantity
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 704
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....a010960a95383993627c2ba85910dfad