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J/PAZh/32/662       Photometric Variability of HD 51585      (Arkhipova+, 2006)

Spectroscopic and Photometric Variability of HD 51585 As a Manifestation of Stellar Wind. Arkhipova V.P., Ikonnikova N.P., Komissarova G.V., Esipov V.F. <Pis'ma Astron. Zh. 32, 662 (2006)> =2006PAZh...32..662A =2006AstL...32..594A
ADC_Keywords: Stars, Be; Spectroscopy; Photometry, UBV Abstract: Photoelectric observations of HD 51585 (OY Gem), a B[e] star with an infrared excess and a candidate for protoplanetary nebulae, obtained with a 60-cm telescope at the Crimean Station of the Sternberg Astronomical Institute in 1992-2005 are presented. The star exhibited rapid irregular brightness variations with amplitudes from 0.1mag in the V band to 0.2mag in the U band within the observing season as well as slow systematic variations with amplitudes from 0.3mag in the V band to 0.65mag in the U band and with a quasi-period of ∼2800days. The B-V color index varied within 0.1mag and did not follow the slow systematic brightness variations, while U-B correlated with the U brightness and varied between 0.7mag at maximum light and 0.35mag at minimum light. Our low-resolution spectroscopy performed in 1994-2005 has revealed significant variability of the Balmer and Paschen hydrogen emission lines as well as the He I and OI lines. Equivalent widths are given for the HI, He I, OI, and Fe II lines; a correlation has been found between the star's photometric variability and the hydrogen line intensities. Our joint analysis of the photometric and spectroscopic data suggests that variations in a strong stellar wind are responsible for the variability of the star. Objects: ------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------- 06 58 30.3 +16 19 25 HD 51585 = V* OY Gem = EM* MWC 162 ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 41 113 UBV observations of HD 51585
See also: J/A+AS/117/281 : Spectroscopy of HD 51585 (= OY Gem) (Jaschek+, 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 I7 d JD Julian date 9- 14 F6.3 mag Vmag V magnitude 16- 21 F6.3 mag Bmag B magnitude 23- 28 F6.3 mag Umag U magnitude 30- 34 F5.3 mag B-V B-V color index 36- 41 F6.3 mag U-B U-B color index

(End) Veta Avedisova (INASAN) 20-Feb-2007
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