Phosphorus Abundances of B-Type Stars in the Solar Neighborhood

• Autorzy: Takeda Y.

Identyfikatory

DOI

10.32023/0001-5237/74.1.3

• Języki publikacji: EN

Abstrakty

EN

Phosphorus abundances of ≈80 apparently bright sharp-lined early-to-late B-type stars on the upper main sequence are determined by applying the non-LTE analysis to the PII line at 6043.084 Å, with the aim of getting information on the P abundance of the galactic gas (from which these young stars were formed) in comparison to the reference solar abundance (A_☉≅5.45). These sample stars turned out to be divided into two distinct groups with respect to their P abundances. Chemically peculiar late B-type stars of HgMn group show considerable overabundances of P (supersolar by ≈0.5-1.5 dex), the extent of which progressively increases with Teff. In contrast, the P abundances of normal B-type stars are comparatively homogeneous, though a notable difference is observed between the LTE and non-LTE cases. Although their LTE abundances are near-solar, a slight gradual trend with T_eff is observed. However, after applying the negative non-LTE corrections (amounting ≈0.1-0.5 dex), this T_eff-dependence is successfully removed, but the resulting non-LTE abundances (their mean is ≅5.20) are appreciably underabundant relative to the Sun by ≈0.2-0.3 dex. The cause of this systematic discrepancy, contradicting the galactic chemical evolution, is yet to be investigated.

Słowa kluczowe

EN

solar neighborhood; stars: abundances; stars: chemically peculiar; stars: early-type

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2024
• Tom: Vol. 74, No. 1
• Strony: 43--67
• Opis fizyczny: Bibliogr. 37 poz., tab., wykr.

Twórcy

autor

Takeda Y.

• 11-2 Enomachi, Naka-ku, Hiroshima-shi, Japan 730-0851

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).