Laizé (Saône-et-Loire). En Bouton n° 2

Tisserand, Nicolas

doi:10.4000/archeomed.22624

Cited by 2 publications

(3 citation statements)

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“…The absolute magnitude of V532 Oph should be M V ∼-5 mag (Clayton 1996;Alcock et al 2001), so assuming V max =11.7 and a reddening of A V =2-3 mag, then it lies at a distance of 5.5-8.7 kpc. Therefore, this star may lie in the Galactic bulge similar to some other recently discovered RCB stars (Zaniewski et al 2005;Tisserand et al 2008).…”

Section: Discussionsupporting

confidence: 66%

“…It has been predicted that there may be as many as 3000 RCB stars in the Galaxy as a whole based on the numbers found in the Magellanic Clouds but only about 65 RCB stars have been discovered so far (Alcock et al 2001;Tisserand et al 2004;Zaniewski et al 2005). The pace of discovery of RCB stars in the Galaxy has been accelerating with about 25 new RCB stars identified in the last 15 years (Benson et al 1994;Clayton et al 2002;Hesselbach et al 2003;Zaniewski et al 2005;Tisserand et al 2008). A more accurate knowledge of the birthrates of RCB stars will constrain the frequency of lowmass WD mergers that produce them in the DD scenario.…”

Section: Introductionmentioning

confidence: 99%

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V532 Oph is a New R Coronae Borealis Star

Clayton,

Kilkenny,

Wils

et al. 2009

Preprint

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V532 Oph has been found to be a member of the rare, hydrogen-deficient R Coronae Borealis (RCB) stars from new photometric and spectroscopic data reported in this paper. The lightcurve of V532 Oph shows the sudden, deep, irregularly spaced declines characteristic of RCB stars. Its optical spectrum is typical of a warm (T ef f ∼ 7000 K) RCB star, showing weak or absent hydrogen lines, the C 2 Swan bands, and no evidence for 13 C. In addition, the star shows small pulsations typical of an RCB star and an infrared excess due to circumstellar dust. It also appears to be significantly reddened by foreground dust. The distance to V532 Oph is estimated to be 5.5-8.7 kpc. These new data show that this star was misclassified as an eclipsing binary in the General Catalog of Variable Stars. The new data presented here for V532 Oph reveal the power of high-quality, high-cadence all-sky photometric surveys, such as ASAS-3, to identify new RCB candidates on the basis of lightcurve data alone, now that they have been collecting data for durations sufficiently long to reveal multiple declines. Despite their small numbers, RCB stars may be of great importance in understanding the late stages of stellar evolution. In particular, their measured isotopic abundances imply that many, if not most, RCB stars are produced by WD mergers, which may be the low-mass counterparts of the more massive mergers thought to produce type Ia supernovae. Therefore, establishing the population of RCB stars in the Galaxy will help constrain the frequency of these WD mergers.

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Section: Discussionsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

V532 Oph is a New R Coronae Borealis Star

Clayton,

Kilkenny,

Wils

et al. 2009

Preprint

View full text Add to dashboard Cite

show abstract

“…There could be as many as 3000 RCB stars in the Galaxy based on the numbers found in the Large Magellanic Cloud (LMC), but only 55 have been discovered in the Galaxy so far (Clayton 1996;Alcock et al 2001;Zaniewski et al 2005;Tisserand et al 2008).…”

Section: Introductionmentioning

confidence: 99%

NSV 11154 Is a New R Coronae Borealis Star

Kijbunchoo,

Clayton,

Vieux

et al. 2011

Preprint

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NSV 11154 has been confirmed as a new member of the rare hydrogendeficient R Coronae Borealis (RCB) stars based on new photometric and spectroscopic data. Using new photometry, as well as archival plates from the Harvard archive, we have constructed the historical lightcurve of NSV 11154 from 1896 to the present. The lightcurve shows the sudden, deep, irregularly spaced declines characteristic of RCB stars. The visible spectrum is typical of a cool (T ef f 5000 K) RCB star showing no hydrogen lines, strong C 2 Swan bands, and no evidence of 13 C. In addition, the star shows small pulsations typical of an RCB star, and an infrared excess due to circumstellar dust with a temperature of ∼800 K. The distance to NSV 11154 is estimated to be ∼14.5 kpc. RCB stars are very rare in the Galaxy so each additional star is important to population studies leading to a better understanding the origins of these mysterious stars. Among the known sample of RCB stars, NSV 11154 is unusual in that it lies well above the Galactic plane (5 kpc) and away from the Galactic Center which suggests that its parent population is neither thick disk nor bulge.

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Laizé (Saône-et-Loire). En Bouton n° 2

Cited by 2 publications

References 0 publications

V532 Oph is a New R Coronae Borealis Star

V532 Oph is a New R Coronae Borealis Star

NSV 11154 Is a New R Coronae Borealis Star

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