Asteroseismology of the ultramassive ZZ Ceti star WD 0246+326
| Autor: | Li, Chun, Fu, Jianning, Fox-Machado, Lester, Su, Jie, Chen, Fangfang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | New Astronomy, Volume 55, p. 48-54, 2017 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.newast.2017.03.003 |
| Popis: | The internal structures of pulsating white dwarfs can be explored only with asteroseismology. Time series photometric observations were made for the pulsating DA white dwarf (ZZ Ceti star) WD~0246+326 during 9 nights in 2014 with a bi-site observation campaign. Eleven frequencies were detected including 1 triplet, 2 doublets, and 4 single modes, which are identified as either $l=1$ or $l=2$ modes with the complementarity of frequencies present in the literature. From the multiplets, the rotation period of \astrobj{WD~0246+326} is derived as $3.78\pm 0.11$ days. The average period spacing of the l=1 modes $\Delta P=29.3\pm 0.2s$, implies that \astrobj{WD~0246+326} may be a massive ZZ Ceti star concerning the $\Delta P-M_*$ relationship for the DAVs. Preliminary analysis derives the stellar parameters of $M_*=0.98\pm0.01$~${\rm M_\odot}$ and $T_{\rm eff}=11700\pm100$~K by fitting the theoretical frequencies of the eigen modes to the observed ones. Comment: 17 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|