Photometric variability and evolutionary status of the supergiant with an infrared excess HD 179821=V1427 aquilae

Details Photometric variability and evolutionary status of the supergiant with an infrared excess HD 179821=V1427 aquilae Photometric variability and evolutionary status of the supergiant with an infrared excess HD 179821=V1427 aquilae

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astl...35..764a&link_type=abstract

Astronomy Letters, Volume 35, Issue 11, pp.764-779

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present new results of our UBV photometry for HD 179821=V1427 Aql, an F supergiant with an infrared excess, from 2000 to 2008. The semiregular low-amplitude (Δ V = 0{./ m }05-0{./ m }20) photometric variability of the star with a cycle period from 130 to 200 days is caused by pulsations, along with the instability of a variable stellar wind. V1427 Aql also exhibits a long-term trend in the brightness and colors that is probably attributable to a change in the stellar temperature as a result of mass loss episodes, which cause variations in the continuum formation level. We present the results of our JHKLM photometry for V1427 Aql in 1992-2008. We trace the trend in the near-infrared brightness, which agrees with the long-term variability in the V band. Based on broadband photometry, we have determined the color excess for V1427 Aql: E( B- V) = 0.7. Based on low-resolution spectroscopy, we have estimated the stellar temperature and revealed variability of the H α line caused by a change in the contribution from the emission component. The hypotheses of whether the star belongs to post-AGB objects or to massive yellow hypergiants are discussed.

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