English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We carried out an extensive observational study of the Slowly Pulsating B(SPB) star, HD 25558. The ~2000 spectra obtained at different observatories,the ground-based and MOST satellite light curves revealed that this object is adouble-lined spectroscopic binary with an orbital period of about 9 years. Theobservations do not allow the inference of an orbital solution. We determinedthe physical parameters of the components, and found that both lie within theSPB instability strip. Accordingly, both show line-profile variations due tostellar pulsations. Eleven independent frequencies were identified in the data.All the frequencies were attributed to one of the two components based onPixel-by-pixel variability analysis of the line profiles. Spectroscopic andphotometric mode identification was also performed for the frequencies of bothstars. These results suggest that the inclination and rotation of the twocomponents are rather different. The primary is a slow rotator with ~6 dperiod, seen at ~60 deg inclination, while the secondary rotates fast with ~1.2d period, and is seen at ~20 inclination. Spectropolarimetric measurementsrevealed that the secondary component has a magnetic field with at least a fewhundred Gauss strength, while no magnetic field can be detected in the primary.

Extensive study of HD 25558, a long-period double-lined binary with two SPB components