| Online-Ressource |
Verfasst von: | Latour, Marilyn [VerfasserIn]  |
| Heber, U. [VerfasserIn]  |
| Irrgang, A. [VerfasserIn]  |
| Schaffenroth, V. [VerfasserIn]  |
| Geier, S. [VerfasserIn]  |
| Hillebrandt, W. [VerfasserIn]  |
| Röpke, Friedrich [VerfasserIn]  |
| Taubenberger, S. [VerfasserIn]  |
| Kromer, M. [VerfasserIn]  |
| Fink, M. [VerfasserIn]  |
Titel: | Quantitative spectral analysis of the sdB star HD 188112 |
Titelzusatz: | a helium-core white dwarf progenitor |
Verf.angabe: | M. Latour, U. Heber, A. Irrgang, V. Schaffenroth, S. Geier, W. Hillebrandt, F. K. Röpke, S. Taubenberger, M. Kromer, M. Fink |
E-Jahr: | 2016 |
Jahr: | 05 January 2016 |
Umfang: | 17 S. |
Teil: | volume:585 |
| year:2016 |
| pages:1-17 |
| extent:17 |
Fussnoten: | Gesehen am 16.06.2020 |
Titel Quelle: | Enthalten in: Astronomy and astrophysics |
Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
Jahr Quelle: | 2016 |
Band/Heft Quelle: | 585(2016) Artikel-Nummer A115, 17 Seiten |
ISSN Quelle: | 1432-0746 |
Abstract: | <i>Context. <i/>HD 188112 is a bright (<i>V<i/> = 10.2 mag) hot subdwarf B (sdB) star with a mass too low to ignite core helium burning and is therefore considered a pre-extremely low-mass (ELM) white dwarf (WD). ELM WDs (<i>M<i/> ≲ 0.3 <i>M<i/><sub>⊙<sub/>) are He-core objects produced by the evolution of compact binary systems.<i>Aims. <i/>We present in this paper a detailed abundance analysis of HD 188112 based on high-resolution <i>Hubble <i/>Space Telescope (HST) near- and far-ultraviolet spectroscopy. We also constrain the mass of the star’s companion. <i>Methods. <i/>We use hybrid non-LTE model atmospheres to fit the observed spectral lines, and to derive the abundances of more than a dozen elements and the rotational broadening of metallic lines. <i>Results. <i/>We confirm the previous binary system parameters by combining radial velocities measured in our UV spectra with the previously published values. The system has a period of 0.60658584 days and a WD companion with <i>M<i/> ≥ 0.70 <i>M<i/><sub>⊙<sub/>. By assuming a tidally locked rotation combined with the projected rotational velocity (<i>v<i/> sin <i>i<i/> = 7.9 ± 0.3 km s<sup>-1<sup/>), we constrain the companion mass to be between 0.9 and 1.3 <i>M<i/><sub>⊙<sub/>. We further discuss the future evolution of the system as a potential progenitor of an underluminous type Ia supernova. We measure abundances for Mg, Al, Si, P, S, Ca, Ti, Cr, Mn, Fe, Ni, and Zn, and for the trans-iron elements Ga, Sn, and Pb. In addition, we derive upper limits for the C, N, O elements and find HD 188112 to be strongly depleted in carbon. We find evidence of non-LTE effects on the line strength of some ionic species such as Si ii and Ni ii. The metallic abundances indicate that the star is metal-poor, with an abundance pattern most likely produced by diffusion effects. |
DOI: | doi:10.1051/0004-6361/201527445 |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1051/0004-6361/201527445 |
| Volltext: https://www.aanda.org/articles/aa/abs/2016/01/aa27445-15/aa27445-15.html |
| DOI: https://doi.org/10.1051/0004-6361/201527445 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1700627279 |
Verknüpfungen: | → Zeitschrift |
Quantitative spectral analysis of the sdB star HD 188112 / Latour, Marilyn [VerfasserIn]; 05 January 2016 (Online-Ressource)