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• W2025315501 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The spectrum of R Geminorum at its unusually bright maximum in 1955. Keenan, P. C. ; Teske, R. G. Abstract R Geminorum, which is one of the brightest long-period variables having a nearly pure S-type spectrum, normally reaches a visual magnitude near 7.1 at maximum. In 1955 the maximum occurred early in March, about 20 days ahead of the predicted date, and the greatest brightness was 6.6 or 6.7 mag. Spectra covering the range from 5000 A to 8500 A were obtained with the coude' spectrograph of the 100-inch reflector at Mount Wilson both at, and slightly before, maximum. At the bright maximum the temperature, as indicated by the level of excitation of the spectrum, was slightly higher than at a normal maximum. Near magnitude 7.4 on the rising branch of the light curve the 1955 spectrum was similar to that usually observed when the star is several tenths of a magnitude brighter. Thus this Se star behaved much like an Me variable, such as Mira, at its brightest maxima. Among the few strong lines of ionized elements which are observed in the red part of the spectrum of R Gem are those of the heavy metals BalI and Laii. Several resonance lines of the corresponding neutral atoms occur in the same spectral region and are very strong when the star is fainter than one magnitude below maximum. The rapid increase in such ratios as Laii 7o66/LaI 7068 as R Gem passes a magnitude of about 7.5 on the way to maximum indicates that at an effective temperature of the order of 28000K much of the lanthanum is already ionized. This is consistent with the low ionization potential (5.61 e.v.) of Lal, and explains the sudden disappearance of the bands of LaO at about the same temperature. On the other hand, the ZrO bands persist to a higher temperature even though the two molecules are probably of comparable stability. This difference is due to the higher ionization potential (6.95 e.v.) of Zri. Perkins Observatory, Delaware, Ohio. Publication: The Astronomical Journal Pub Date: May 1956 DOI: 10.1086/107316 Bibcode: 1956AJ.....61..181K full text sources ADS | data products SIMBAD (1)" @default.
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• W2025315501 date "1956-05-01" @default.
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• W2025315501 title "The spectrum of R Geminorum at its unusually bright maximum in 1955." @default.
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