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The long‐term variability of Vega
Author(s) -
Butkovskaya V.,
Plachinda S.,
Valyavin G.,
Baklanova D.,
Lee B.C.
Publication year - 2011
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201111587
Subject(s) - vega , spectrograph , physics , observatory , astrophysics , astronomy , corsican , spectral line , linguistics , philosophy
Over the time of 60 years Vega ( α Lyrae = HD 172167, A0V) has been generally accepted as a standard star in the nearinfrared, 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 (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)