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Search for candidate main target early B stars

Search for candidate main target early B stars. Karolien Lefever, Katrien Uytterhoeven, Carla Maceroni, Josefina Montalban, Ennio Poretti, Anwesh Mazumdar, Maryline Briquet, Mario Ausseloos, Joris De Ridder, Caroline Schoenaers, and Conny Aerts. Strategy.

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Search for candidate main target early B stars

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  1. Search for candidate main target early B stars • Karolien Lefever, Katrien Uytterhoeven, Carla Maceroni, Josefina Montalban, Ennio Poretti, Anwesh Mazumdar, Maryline Briquet, Mario Ausseloos, Joris De Ridder, Caroline Schoenaers, and Conny Aerts

  2. Strategy • After Marseille: search for early-type B stars as candidate main targets • Search in center direction (note: several OB stars are available in field of HD 46558) • Selection of 5 stars of SpT B0-B2 • Check HIPPARCOS and GAUDI data (vsini,Ha) • Observe them with Mercator before Berlin • Take additional spectra if possible

  3. Selected stars HD 170580 HD 172028 HD 172488 HD174069 HD 180642

  4. Data Ennio HD 170580 HD 172028 HD 172488 HD174069 HD 180642

  5. HD 170580: periodograms Hp data

  6. HD 170580: phase diagrams for Hp

  7. HD 170580: periodograms U data

  8. HD 170580: phase diagrams for U

  9. HD 170580: profile variations ?

  10. HD 170580: basic parameters

  11. Instability strips (Pamyatnykh 1999)

  12. HD 180642: periodograms

  13. HD 180642: periodograms

  14. HD 180642: predicted modes

  15. Conclusions • First priority: HD 170580 (several good sismo fields - COROTSKY) • Second priority: HD 180642, together with main target HD 181555 (and new d Scuti candidate HD 181147 or G-type star) if Magali ! (good choice of other targets in environment - COROTSKY) • In anticenter direction: can we select several B0III stars while doing HD 46558 , and also HD 47240 (B1Ib, Aerts, CW2)

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