UBV observations of post-AGB supergiants and peculiarities of their photometric variability

Архипова, В. П.; Иконникова, Н. П.; Noskova, R. I.; Sokol, G. V.

doi:10.1134/1.1307895

Cited by 26 publications

(48 citation statements)

References 5 publications

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“…However in these previous studies, two post-AGB stars have been reported with the same kind of pulsation amplitude and period as HD 179821: V887 Her (Arkhipova et al 2000) and IRAS 07430+1115 (Hrivnak et al 2001). Nevertheless, for a low mass star, non-linear radiative pulsation models are not able to reproduce long periods (P > 130 days) with low amplitudes (∆m 0.2) such as the ones found for HD 179821 (A. Fokin, private communication).…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of the few post-AGB stars that have been studied for variability (see Arkhipova et al 2000;Hrivnak et al 2001), a long period (P > 130 days, like the one we found in HD 179821) is generally associated with a pulsation amplitude higher than 0.2 mag. However in these previous studies, two post-AGB stars have been reported with the same kind of pulsation amplitude and period as HD 179821: V887 Her (Arkhipova et al 2000) and IRAS 07430+1115 (Hrivnak et al 2001).…”

Section: Resultsmentioning

confidence: 99%

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Observational survey of the puzzling star HD 179821: Photometric variations and period analysis

Coroller¹,

Lèbre²,

Gillet³

et al. 2003

A&A

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Abstract.From new photometric observations (UBVRI), we present the characteristic features of the light variations of the evolved star HD 179821 (= SAO 124414 = IRAS 19114+0002). Our data, collected through 1999 and 2000, have been combined together with previous photometric measurements available in the literature. Thus, a long term V-light curve (gathering more than 10 years of observations for HD 179821) has been composed. We have analysed it with the Fourier transform method. Two main frequencies are present in the resulting power spectrum, reflecting a dominant bimodal pulsator behavior. A long term phenomenon is also found, but it is not possible to decide whether it is periodic. The Fourier analysis has also been applied on two other filters (U and B) and confirms the detected frequencies. On the basis of our period analysis, we discuss the nature of HD 179821: low-mass post-AGB star or high-mass star.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Observational survey of the puzzling star HD 179821: Photometric variations and period analysis

Coroller¹,

Lèbre²,

Gillet³

et al. 2003

A&A

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“…In this model we considered only amorphous grains with two different sizes. The LRS IRAS spectrum was taken from http://www.iras.ucalgary.ca/˜volk/getlrs.plot.html and IRAS fluxes as well as optical and near infrared photometry were taken from Fouqué et al (1992) and Arkhipova et al (2000). All these data were used to constrain the models.…”

Section: Modellingmentioning

confidence: 99%

Optical and infrared spectroscopic analysis of the post-AGB star candidate IRAS 19386+0155

Pereira¹,

Lorenz-Martins

Machado³

2004

A&A

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Abstract. This work reports high-resolution spectroscopic stellar parameters and abundance analysis of the post-AGB star IRAS 19386+0155. The analysis of the high resolution spectrum shows that it has an effective temperature of T eff = 6800 ± 100 K and a surface gravity of log g = 1.4 ± 0.2. The abundance analysis reveals IRAS 19386+0155 to be a metal-poor object having [Fe/H] = −1.1. Carbon, oxygen and nitrogen are found to be slight underabundant than solar, and so are the α-elements (Mg, Si and Ca). The analysis of ISO spectra revealed an oxygen-rich envelope and showed crystalline silicate features. The dust envelope of this object was modelled using a Monte Carlo type numerical method and amorphous and crystalline silicate grains were considered. The photospheric temperature obtained through the optical spectroscopy was used to constrain these models. The Spectral Energy Distribuition (SED) of this object is broad and extensive suggesting the presence of a dust disk around IRAS 19386+0155.

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“…6a). Arkhipova et al (1999Arkhipova et al ( , 2000 found that it shows irregular rapid light variations in the optical with an amplitude of upto 0. m 3 in V. We adopted mean V = 11. m 54 (Arkhipova et al 1999). Following the prescription in Sect.…”

Section: Variations In the Uv(iue) Spectra Of Iras 16206-5956 (Sao 24mentioning

confidence: 99%

UV(IUE) spectra of hot post-AGB candidates

Gauba

Parthasarathy

2003

A&A

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UBV observations of post-AGB supergiants and peculiarities of their photometric variability

Cited by 26 publications

References 5 publications

Observational survey of the puzzling star HD 179821: Photometric variations and period analysis

Observational survey of the puzzling star HD 179821: Photometric variations and period analysis

Optical and infrared spectroscopic analysis of the post-AGB star candidate IRAS 19386+0155

UV(IUE) spectra of hot post-AGB candidates

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