Elements of σ Coronae borealis
نویسندگان
چکیده
منابع مشابه
H α emission in the chromospherically active binary σ 2 Coronae Borealis ( TZCrB )
Spectrophotometry of the chromospherically active system σ2 Coronae Borealis was obtained in the Hα region, during two observing campaigns at Catania Observatory. During the first campaign, 1988 June 22 – 29, 135 spectra were collected, while 12 spectra were obtained during the second campaign which spanned from June 2nd to June 12th 1989. We have recorded the spectra of the two stars composing...
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Neutral fluorine (F i) lines are identified in the optical spectra of several RCoronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is enriched in some RCBs by factors of 800 to 8000 relative to its likely initial abundance. The overabundances of fluorine are evidence for the synthesis of fluorine. These res...
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We present new spectroscopic observations of the He I λ10830 line in R Coronae Borealis (RCB) stars which provide the first strong evidence that most, if not all, RCB stars have winds. It has long been suggested that when dust forms around an RCB star, radiation pressure accelerates the dust away from the star, dragging the gas along with it. The new spectra show that nine of the ten stars obse...
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We present the results of UBV JHKLM photometry of RCrB spanning the period from 1976 to 2001. Studies of the optical light curve have shown no evidence of any stable harmonics in the variations of the stellar emission. In the L band we found semi-regular oscillations with the two main periods of ∼ 3.3 yr and ∼ 11.9 yr and the full amplitude of ∼ 0. 8 and ∼ 0. 6, respectively. The colors of the ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1875
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18750852103