The long-term variability of Vega

Details The long-term variability of Vega The long-term variability of Vega

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011an....332..956b&link_type=abstract

Astronomische Nachrichten, Vol.332, Issue 9/10, p.956

Astronomy and Astrophysics

Astronomy

Stars: Early-Type, Stars: Individual (Α Lyrae), Stars: Magnetic Fields, Stars: Variables: General

Scientific paper

Over the time of 60 years Vega (α Lyrae = HD 172167, A0V) has been generally accepted as a standard star in the near-infrared, optical, and ultraviolet regions. But is the spectrophotometric standard Vega really non-variable star? Researchers give very different answers to this question. We aim to search a periodicity in our results of spectropolarimetric study of Vega, namely periodic variations in equivalent width of the spectral lines and longitudinal magnetic field measurements. High-accuracy spectropolarimetric observations of Vega have been performed during 26 nights from 1997 to 2010 using the Coudé spectrograph of the 2.6-m Shain reflector at the Crimean Astrophysical Observatory (CrAO, Ukraine) and during 4 nights in 2007 and 2008 using the echelle spectrograph BOES at the Bohyunsan Optical Astronomy Observatory (BOAO, South Korea). The long-term (year-to-year) variability of Vega was confirmed. It was concluded that this variability does not have magnetic nature.
The paper is dedicated to the memory of V.P. Merezhin.

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