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Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy


Walker, G. A. H.; Kuschnig, R.; Matthews, J. M.; Reegen, P.; Kallinger, T.; Kambe, E.; Saio, H.; Harmanec, P.; Guenther, D. B.; Moffat, A. F. J. et al.
Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy // The Astrophysical journal, 623 (2005), 2; L145-L148 (međunarodna recenzija, članak, znanstveni)


Naslov
Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy

Autori
Walker, G. A. H. ; Kuschnig, R. ; Matthews, J. M. ; Reegen, P. ; Kallinger, T. ; Kambe, E. ; Saio, H. ; Harmanec, P. ; Guenther, D. B. ; Moffat, A. F. J. ; Rucinski, S. M. ; Sasselov, D. ; Weiss, W. W. ; Bohlender, D. A. ; Božić, Hrvoje ; Hashimoto, O. ; Koubský, P. ; Mann, R. ; Ruždjak, Domagoj ; Škoda, P. ; Šlechta, M. ; Sudar, Davor ; Wolf, M. ; Yang, S.

Izvornik
The Astrophysical journal (0004-637X) 623 (2005), 2; L145-L148

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Line: Profiles; Stars: Early-Type; Stars: Emission-Line; Be; Stars: Individual: Constellation Name: zeta Ophiuchi; Stars: Oscillations; Stars: Rotation

Sažetak
Twenty-four days of highly precise Microvariability and Oscillations of Stars (MOST) satellite photometry obtained in mid-2004 of the rapidly rotating O9.5 V star zeta Oph have yielded at least a dozen significant oscillation frequencies between 1 and 10 cycles day-1, clearly indicating its relationship to beta Cephei variables. Eight periods were found in He I alpha 4922 and H beta line profile variations (LPV) of which six coincide with those from the MOST photometry. This unique photometric and spectroscopic detection of radial and nonradial pulsations leads to a plausible model in which high l-modes are excited when their frequencies in the corotating frame are similar to those of low-order radial modes. We propose that the dominant photometric 4.6 hr period (f1) corresponds to a radial first overtone excited by the kappa -mechanism associated with the Fe opacity bump. No unambiguous rotational period can be identified in either the light curve or the LPV.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0007016

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Domagoj Ruždjak (autor)

Avatar Url Davor Sudar (autor)

Avatar Url Hrvoje Božić (autor)

Citiraj ovu publikaciju

Walker, G. A. H.; Kuschnig, R.; Matthews, J. M.; Reegen, P.; Kallinger, T.; Kambe, E.; Saio, H.; Harmanec, P.; Guenther, D. B.; Moffat, A. F. J. et al.
Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy // The Astrophysical journal, 623 (2005), 2; L145-L148 (međunarodna recenzija, članak, znanstveni)
Walker, G., Kuschnig, R., Matthews, J., Reegen, P., Kallinger, T., Kambe, E., Saio, H., Harmanec, P., Guenther, D. & Moffat, A. (2005) Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy. The Astrophysical journal, 623 (2), L145-L148.
@article{article, year = {2005}, pages = {L145-L148}, keywords = {Line: Profiles, Stars: Early-Type, Stars: Emission-Line, Be, Stars: Individual: Constellation Name: zeta Ophiuchi, Stars: Oscillations, Stars: Rotation}, journal = {The Astrophysical journal}, volume = {623}, number = {2}, issn = {0004-637X}, title = {Pulsations of the Oe Star zeta Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy}, keyword = {Line: Profiles, Stars: Early-Type, Stars: Emission-Line, Be, Stars: Individual: Constellation Name: zeta Ophiuchi, Stars: Oscillations, Stars: Rotation} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus