| Autor: |
Marcus L. Marcussen, Simon H. Albrecht, Joshua N. Winn, Yubo Su, Mia S. Lundkvist, Kevin C. Schlaufman |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 975, Iss 1, p 149 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad75fa |
| Popis: |
The degree of spin–orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin–orbit angles ( ψ ) are random, rotational broadening should not depend on orbital inclination. Using this technique, we investigated a sample of 2727 astrometric binaries from Gaia DR3 with F-type primaries and orbital periods between 50 and 1000 days (separations 0.3–2.7 au). We found that ψ is strongly associated with e , the orbital eccentricity. When e < 0.15, the mean spin–orbit angle is $\langle \psi \rangle ={6.9}_{-4.1}^{+5.4}$ degrees, while for e > 0.7, it rises to $\langle \psi \rangle ={46}_{-24}^{+26}$ degrees. These results suggest that some binaries are affected by processes during their formation or evolution that excite both orbital eccentricity and inclination. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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