Identification of peculiar A-stars. I. Analysis of the equivalent width of the 2786–2810 Å spectral band and the MgII 4481 Å line for 137 A-stars

Ohanesyan, J. B.

doi:10.1007/s10511-008-9041-5

Cited by 4 publications

(1 citation statement)

References 24 publications

(16 reference statements)

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“…Actual values of the separation and magnitude difference from the WDS catalogue are 0.2 arcsec and 1.1 mag (Mason et al 2001). HD 220278 does appear in the catalogue of λ Boo stars by Renson et al (1990), and is given as ‘λ Boo, CP(Mg wk), close binary’ in Ohanesyan (2008), where the EW of the and 4481 features are described for many stars, but its status as a true λ Boo star is clearly doubtful. Recommendation: uncertain member.…”

Section: Notes On Members Of the λ Boo Classmentioning

confidence: 99%

An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue

Murphy

Corbally²,

Gray

et al. 2015

Publ. Astron. Soc. Aust.

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The literature on the λ Boo stars has grown to become somewhat heterogenous, as different authors have applied different criteria across the UV, optical and infrared regions to determine the membership status of λ Boo candidates. We aim to clear up the confusion by consulting the literature on 212 objects that have been considered as λ Boo candidates, and subsequently evaluating the evidence in favour of their admission to the λ Boo class. We obtained new spectra of ∼90 of these candidates and classified them on the MK system to aid in the membership evaluations. The re-evaluation of the 212 objects resulted in 64 members and 103 non-members of the λ Boo class, with a further 45 stars for which membership status is unclear. We suggest observations for each of the stars in the latter category that will allow them to be confidently included or rejected from the class. Our reclassification facilitates homogenous analysis on group members, and represents the largest collection of confirmed λ Boo stars known. c 0000 RAS

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Section: Notes On Members Of the λ Boo Classmentioning

confidence: 99%

An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue

Murphy

Corbally²,

Gray

et al. 2015

Publ. Astron. Soc. Aust.

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Further detections of exocomet absorbing gas around Southern hemisphere A-type stars with known debris discs

Welsh

Montgomery

2017

Monthly Notices of the Royal Astronomical Society

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Utilizing Synthetic Uv Spectra to Explore the Physical Basis for the Classification of Lambda Boötis Stars

Cheng

Neff

Johnson

et al. 2016

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Lambda Boo-type stars are a group of late B to early F-type Population I dwarfs that show mild to extreme deficiencies of iron-peak elements (up to 2 dex), but their C, N, O, and S abundances are near solar. This intriguing stellar class has recently regained the spotlight because of the directly imaged planets around a confirmed Lambda Boo star, HR 8799, and a suggested Lambda Boo star, Beta Pictoris. The discovery of a giant asteroid belt around Vega, another possible Lambda Boo star, also suggests hidden planets. The possible link between Lambda Boo stars and planet-bearing stars motivates us to study Lambda Boo stars systematically. Since the peculiar nature of the prototype Lambda Boötis was first noticed in 1943, Lambda Boo candidates published in the literature have been selected using widely different criteria. In order to determine the origin of Lambda Boo stars’ unique abundance pattern and to better discriminate between theories explaining the Lambda Boo phenomenon, a consistent working definition of Lambda Boo stars is needed. We have re-evaluated all published Lambda Boo candidates and their available ultraviolet and visible spectra. In this paper, using observed and synthetic spectra, we explore the physical basis for the classification of Lambda Boo stars, and develop quantitative criteria that discriminate metal-poor stars from bona fide Lambda Boo stars. Based on these stricter Lambda Boo classification criteria, we conclude that neither Beta Pictoris nor Vega should be classified as Lambda Boo stars.

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Identification of peculiar A-stars. I. Analysis of the equivalent width of the 2786–2810 Å spectral band and the MgII 4481 Å line for 137 A-stars

Cited by 4 publications

References 24 publications

An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue

An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue

Further detections of exocomet absorbing gas around Southern hemisphere A-type stars with known debris discs

Utilizing Synthetic Uv Spectra to Explore the Physical Basis for the Classification of Lambda Boötis Stars

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