He 2-467 - A yellow symbiotic star

Kaler, J. B.; Lutz, J. H.

doi:10.1086/130620

Cited by 2 publications

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“…Lutz et al (1976) were the first to measure the relative intensities of the HI, HeI, HeII λ4686 and CII λ4267. Subsequently, Lutz (1977) detected a change in the intensity ratio of the HeII λ4686 and Hβ, lines, while Kaler and Lutz (1980) found variations of the fluxes in the continuum and Hβ, Hα and HeII λ4686 emission lines. Navarro et al (1987) derived the relative emission line intensities in the optical spectral range and compared their results with the data of Lutz et al (1976) and Lutz (1977).…”

Section: Introductionmentioning

confidence: 99%

Spectrum of the Yellow Symbiotic Star LT Delphini before, during, and after the 2017 Outburst

et al. 2019

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LT Del is a yellow symbiotic system that consists of a bright K3-type giant and a hot subdwarf with a temperature ∼ 10 5 K. We present the results of our spectroscopic observations of LT Del over the period 2010-2018. In 2017 the star experienced a second low-amplitude (∆V ∼ 0. m 7) outburst in the history of its studies. The emission spectrum of the star represented in the optical range by hydrogen, neutral and ionized helium lines underwent significant changes in the outburst. The fluxes in the HI and HeI emission lines increased by a factor of 5-6, the HeII λ4686 line grew by a factor of 10. According to our estimates, in the 2017 outburst the temperature of the exciting star rose to T hot ∼130 000 K, while during the first 1994 outburst the change in temperature was insignificant. This suggests cool and hot outbursts of LT Del by analogy with similar events of another yellow symbiotic star, AG Dra.

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Section: Introductionmentioning

confidence: 99%

Spectrum of the Yellow Symbiotic Star LT Delphini before, during, and after the 2017 Outburst

et al. 2019

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“…The emission-line object He 2-467 from the catalogue of Henize (1967), which was deemed a planetary nebula for some time after its discovery, was assigned by Kaler and Lutz (1980) to a small group of yellow symbiotic stars whose cool components have a spectral type no later than K5. The binary system He 2-467 consists of a bright G or K giant and a compact hot star with a temperature of ∼ 10 5 K. The emission-line spectrum is excited by radiation from the hot star and consists of hydrogen, neutral and ionized helium lines in the optical band.…”

Section: Introductionmentioning

confidence: 99%

Second Outburst of the Yellow Symbiotic Star LT Delphini

2019

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We present the results of our photoelectric U BV observations of the yellow symbiotic star LT Del over 2010-2018. The binary system LT Del, which consists of a bright K giant and a compact hot star with a temperature of ∼100 000 K, has an orbital period of 476 days. In 2017 the variable experienced a second low-amplitude (∆V ∼ 0. m 7) outburst in the history of its studies whose maximum occurred at an orbital phase of 0.15±0.05. The outburst duration was ∼60 days. The B − V and U − B colors in the outburst became noticeably bluer. A difference in the photometric behavior of the star in the 1994 and 2017 outburst has been detected. In the orbital cycle preceding the 2017 outburst a secondary minimum with a depth of 0. m 15 and 0. m 20 appeared in the B and V light curves, respectively, whose cause is discussed. The phase light and color curves are presented and explained; the position of the star on the color-color diagram is interpreted. We have estimated the parameters of the cool and hot components of the system based on the distance determination from Gaia DR2.

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He 2-467 - A yellow symbiotic star

Cited by 2 publications

References 3 publications

Spectrum of the Yellow Symbiotic Star LT Delphini before, during, and after the 2017 Outburst

Spectrum of the Yellow Symbiotic Star LT Delphini before, during, and after the 2017 Outburst

Second Outburst of the Yellow Symbiotic Star LT Delphini

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