FBS 2213+421: A dust-enshrouded long-period AGB Mira variable?

Gigoyan, K. S.; Russeil, D.

doi:10.1007/s10511-006-0008-0

Cited by 3 publications

(5 citation statements)

References 14 publications

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“…The USNO-B1.0 catalogue B and R magnitude differences (R2 -R1 = 6.86 mag, and B2 -B1 = 2.38 mag) between two epochs (POSS I and POSS II) presented in our previous paper [1] for ERO FBS 2213+421 indicate the confident variability for this object.…”

Section: Variabilitymentioning

confidence: 58%

“…We turn our attention again to late-type star FBS 2213+421 [1], after revision of all possible data in modern astronomical catalogues for this object. We have detected this object on the First Byurakan Survey (FBS) [2] plate and estimated it as a star of M5-M6 subclass, according to the energy distribution in the low-resolution (lr) FBS spectrum (~1800A/mm near γ H ; see more details in the paper [3] and Digitized First Byurakan Survey -DFBS database at http://www.aras.am for FBS lr spectral characteristics for various type of objects).…”

Section: Introductionmentioning

confidence: 99%

“…Finding charts from the DSS database, optical and near-infrared photometric data from USNO-B1.0 [4], and the 2MASS Point Source Catalogue (PSC) are presented in our previous paper [1] …”

Section: Introductionmentioning

confidence: 99%

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FBS 2213+421, an extremely red object with C-rich characteristics

Gigoyan

Russeil²,

Sarkissian

et al. 2009

Astrophysics

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Section: Variabilitymentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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FBS 2213+421, an extremely red object with C-rich characteristics

Gigoyan

Russeil²,

Sarkissian

et al. 2009

Astrophysics

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“…Only two stars(FBS 1812+455 and FBS 2213+421) have been also detected in spectroscopic mode. IRAS spectra for FBS 0137+400 and FBS 2213+421 are presented in papers [21,22]. The long period variable FBS 1812+455 will be discussed below.…”

Section: Ir-datamentioning

confidence: 99%

Investigation of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey. III. Infrared Characteristics

et al. 2017

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International audienceInfraRed (IR) astronomical databases, namely, IRAS, 2MASS, WISE, and Spitzer, are used to analyze photometric data of 126 carbon (C) stars whose spectra are visible in the First Byurakan Survey (FBS) low-resolution(lr) spectral plates. Among these, six new objects, recently confirmed on the digitized FBS plates, are included. For three of them, moderate-resolution CCD optical spectra are also presented. In this work several IR color-color diagrams are studied. Early and late-type C stars are separated in the JHK Near-InfraRed (NIR) color-color plots, as well as in the WISE W3-W4 versus W1-W2 diagram. Late N-type Asymptotic Giant Branch (AGB) stars are redder in W1-W2, while early-types (CH and R giants) are redder in W3-W4 as expected. Objects with W2-W3 > 1.0 mag. show double-peaked spectral energy distribution (SED), indicating the existence of the circumstellar envelopes around them. Twnty-six N-type stars have IRAS Point Source Catalog (PSC) associations. For FBS 1812+455, IRAS Low-Resolution Spectra (LRS) in the wavelength range 7.7 ÷ 22.6 μm and Spitzer Space Telescope Spectra in the range 5 ÷ 38μm are presented, clearly showing absorption features of C₂H₂ (acetylene) molecule at 7.5 and 13.7 μm, and the SiC (silicone carbide) emission at 11.3 μm. The mass-loss rates for eight Mira-type variables are derived from the K-[12] color and from the pulsation periods. The reddest object among the targets is N-type C star FBS 2213+421, which belongs to the group of the cold post-AGB R Coronae Borealis (R CrB) variables

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“…Over the years the star has been subject to periods of high luminosity and of rapid, severe obscuration episodes. Classified as a Dwarf Nova by (Dahlmark 1996) and by Hoard et al (2002) on the basis of the photometric variability, then as an M5-M6 star by Gigoyan et al (2006) from a low dispersion objective-prism plate of the First Byurakan Survey (Markarian et al 1989), it was finally recognised as a Carbon star by Gigoyan et al (2009). To clarify its nature we started since 2012 a photometric and spectroscopic campaign and collected the available data from literature and public catalogs.…”

Section: Introductionmentioning

confidence: 99%

The variable V381 Lac and its possible connection with the R CrB phenomenon

Rossi¹,

Dell’Agli²,

Paola³

et al. 2015

Mon. Not. R. Astron. Soc.

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We have performed new medium resolution spectroscopy, optical and near infrared photometry to monitor the variability of the AGB carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the optical and near infrared bands. Most notably we observed the change of NaI D lines from deep absorption to emission, and the progressive growing of the [N ii] doublet 6548-6584Å emission, strongly related to the simultaneous photometric fading. V381 Lac occupies regions of 2MASS and WISE colour-colour diagrams typical of stars with dust formation in the envelope. The general framework emerging from the observations of V381 Lac is that of a cool AGB carbon star undergoing episodes of high mass ejection and severe occultation of the stellar photosphere reminiscent of those characterising the RCB phenomenon.Comparing the Spectral Energy Distribution obtained with the theoretical model for AGB evolution with dust in the circumstellar envelope, we can identify V381 Lac as the descendant of a star of initial mass ∼2M , in the final AGB phases, evolved into a carbon star by repeated Third Dredge Up episodes. According to our model the star is moderately obscured (τ 10 ∼ 0.22) by dust, mainly formed by amorphous carbon (∼ 80%) and SiC (∼ 20%), with dust grain dimensions around ∼ 0.2µm and 0.08µm respectively.

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FBS 2213+421: A dust-enshrouded long-period AGB Mira variable?

Cited by 3 publications

References 14 publications

FBS 2213+421, an extremely red object with C-rich characteristics

FBS 2213+421, an extremely red object with C-rich characteristics

Investigation of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey. III. Infrared Characteristics

The variable V381 Lac and its possible connection with the R CrB phenomenon

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