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Detection of cesium in the atmosphere of the hot He-rich white dwarf HD 149499B

Chayer, P. and Mendoza, C. and Meléndez, M. and Deprince, J. and Dupuis, J. (2023) Detection of cesium in the atmosphere of the hot He-rich white dwarf HD 149499B. Monthly Notices of the Royal Astronomical Society, 518 (1). pp. 368-381. ISSN 0035-8711. doi:10.1093/mnras/stac3138.

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We report the first detection of cesium (Z = 55) in the atmosphere of a white dwarf. Around a dozen absorption lines of Cs IV, Cs V, and Cs VI have been identified in the Far Ultraviolet Spectroscopic Explorer spectrum of the He-rich white dwarf HD 149499B (T_(eff) = 49 500 K, log g = 7.97). The lines have equivalent widths ranging from 2.3 to 26.9 mÅ. We performed a spectral synthesis analysis to determine the cesium content in the atmosphere. Non-local thermodynamic equilibrium atmosphere models were computed by considering cesium explicitly in the calculations. For this purpose we calculated oscillator strengths for the bound–bound transitions of Cꜱ ɪᴠ–Cꜱ ᴠɪ with both AUTOSTRUCTURE (multiconfiguration Breit–Pauli) and GRASP2K (multiconfiguration Dirac–Fock) atomic structure codes as neither measured nor theoretical values are reported in the literature. We determined a cesium abundance of log N(Cs)/N(He) = −5.45 ± 0.35, which can also be expressed in terms of the mass fraction logX_(Cꜱ) = −3.95 ± 0.35.

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Chayer, P.0000-0001-7653-0882
Mendoza, C.0000-0002-2854-4806
Deprince, J.0000-0002-3409-8232
Additional Information:This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. All of the astronomical observation data presented in this paper were obtained from the Mikulski Archive for Space Telescope (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX13AC07G and by other grants and contracts. This research has made use of NASA’s Astrophysics Data System.
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ID Code:118498
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Deposited On:20 Jan 2023 20:52
Last Modified:20 Jan 2023 20:52

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