1 / 6

Magnetic activity of F stars

Magnetic activity of F stars. Savita Mathur Space Science Institute. Magnetic activity: photometry. VIRGO/SPM. VIRGO/SPM. Sunspot number. [Mathur et al. 2013]. [Garc ía et al. 2010]. [ Salabert et al. 2009]. Stellar parameters: F5V dwarf 1.2 M  ; 1.3 R 

sade-mack
Download Presentation

Magnetic activity of F stars

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Magnetic activity of F stars Savita Mathur Space Science Institute

  2. Magnetic activity: photometry VIRGO/SPM VIRGO/SPM Sunspotnumber [Mathuret al.2013] [García et al. 2010] [Salabert et al. 2009] APS colloquium 2014

  3. Stellar parameters: F5V dwarf 1.2 M; 1.3 R Observed by CoRoT during 60 + 137 days + 90 days 50 oscillation modes measured Prot= 3.4 days TheCoRoT target: HD49933 // // // // [Appourchaux et al. 2008; Benomar et al. 2009] APS colloquium 2014

  4. Hints of a magnetic-activitycycle Spectroscopy HD49933 Seismology [García et al. 2010] • Complementaryobservations • Ca HK: Mount Wilson index of 0.31 • Active star Anticorrelation between amplitude variation and frequency shifts Pcyc>120days APS colloquium 2014

  5. Coming back to surface rotation Prot<12d HD49933 [Garcia et al. in preparation] [García et al. in prep.] APS colloquium 2014

  6. Results: Kepler • We observe: • Magnetic Cycle-like behaviour • Long-lived active longitudes during maximum activity [Mathur et al. 2014, in press] Shere-Khan Prot=2.5d <Sph> = 250 ppm Asteroseismology: M~1.4M DCZ~3% APS colloquium 2014

More Related