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[Fizinfo] MTA CSFK CSI szeminárium, 2013.08.08. csütörtök 14:00

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  • From: Uhlár Karola <uhlar AT>
  • To: szeminar AT, fizinfo AT
  • Subject: [Fizinfo] MTA CSFK CSI szeminárium, 2013.08.08. csütörtök 14:00
  • Date: Thu, 01 Aug 2013 14:50:23 +0200
  • List-archive: <>
  • List-id: ELFT HÍRADÓ <>


Elo~adó:*Sódor Ádám* (Royal Observatory of Belgium, MTA CSFK)

Elo~adás címe: **Extensive spectroscopic and photometric study of HD 25558, a long orbital period double-lined binary with two SPB components? *
Our project aims at investigating main-sequence g-mode pulsators in detail by collecting and analysing time-series of photometric and high-resolution spectroscopic measurements. In this talk, I introduce the project and the results obtained for the SPB (Slowly Pulsating B star) system, HD 25558. The investigation of the ~2000 spectra obtained at 13 observatories during 5 observing seasons, the ground-based multi-colour light curves and the photometric data from the MOST stellite revealed that this object is a double-lined spectroscopic binary with a very long orbital period of about 9 years. We determined the physical parameters of the components individually, and have found that both lie within the SPB instability strip. Accordingly, both components show line-profile variations consistent with stellar pulsations. Altogether, 11 independent frequencies were identified. The observational data do not allow the inference of a reliable orbital solution, thus, disentangling cannot be performed on the spectra. Since the lines of the two components are never completely separated, the analysis is very complicated. Nevertheless, pixel-by-pixel variation analysis of the cross-correlated line profiles was succesful, and we were able to attribute all the frequencies either to the primary or to the secondary component. Both spectroscopic and photometric mode-identification was also performed for several of these frequencies of both binary components. Comparison of the mode-identification results on the two components suggests some properties of a mode-selection mechanism in action.

Elo~adás ido~pontja: *2013. augusztus 8. (csütörtök), 14:00**
Elo~adás helyszíne: MTA CSFK CSI Elo~adóterme
1121 Budapest, Konkoly T. M. út 15-17.
fn:Karola Uhlar
org:Konkoly Observatory
adr:;;Konkoly Thege M. u. 13-17.;Budapest;;1121;Hungary
email;internet:uhlar AT

  • [Fizinfo] MTA CSFK CSI szeminárium, 2013.08.08. csütörtök 14:00, Uhlár Karola, 08/01/2013

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