SPECTRAL VARIABILITY OF THE UNUSUAL SOUTHERN Be STAR HD 152478

Автор(и)

  • M. A. Pogodin Pulkovo Observatory, St. Petersburg 196140, Russia, Російська Федерація
  • N. A. Drake Sobolev Astronomical Institute, St. Petersburg State University, St. Petersburg, 198504, Russia, Російська Федерація
  • E. G. Jilinski Pulkovo Observatory, St. Petersburg 196140, Russia; Observat´orio Nacional/MCT, Rio de Janeiro, 20921-400, Brazil; Instituto de F´ısica, Universidade do Estado do Rio de Janeiro Rio de Janeiro, 200550-900, Brazil, Російська Федерація
  • V. G. Ortega Observat´orio Nacional/MCT, Rio de Janeiro, 20921-400, Brazil, Бразилія
  • R. de la Reza Observat´orio Nacional/MCT, Rio de Janeiro, 20921-400, Brazil, Бразилія

DOI:

https://doi.org/10.18524/1810-4215.2010.23.85240

Ключові слова:

Stars, Be, circumstellar matter, stars, spectroscopy, individual, HD 152478

Анотація

We present results of the spectroscopic investigation
of the unusual southern Be star HD 152478. Five
echelle high-resolution spectra of the object were
obtained in 2007 - 2009 with the FEROS spectrograph
mounted at the 2.2 m telescope of the European Southern Observatory (La Silla, Chile). The star exhibits
a specific remarkable variability of the numerous line
profilesofsuchelementsasHi,Hei,Feii,etc. The
analysis of the spectral behaviour of the object has
shown that the assumption of global oscillations in
the rotating equatorial gaseous disk is not confirmed
by the observations. The alternative hypothesis of a
variable magnetized stellar wind of flattened geometry
flowing close to the equatorial disk can qualitatively
explain the observed profile variations.

Посилання

Bjorkman J.E., Cassinelli J.P.: 1993,ApJ, 409, 429.

Jilinski E.G., Ortega V.G., Drake N.A., de la Reza R.:2010,ApJ, 721, 469.

Hanuschik R.W., Hummel W., Dietle O., Sutorius E.:1995,A&A, 300, 163.

Hoogerwerf R., de Bruijne J.H.J., de Zeeuw P.T.:2001,A&A, 365, 49.

Hubrig S., Sch¨oller M., Savanov I., Yudin R.V.,Pogodin M.A., Stefl St., Rivinius Th., Cur´eM.:2009,AN, 330, 708.

Kato S.: 1983,PASJ, 35, 249.

Levenhagen R.S., Leister N.V.: 2006,MNRAS, 371,252

Okazaki A.T.: 1991,PASJ, 43, 75.

Piskunov N.E.: 1992,Stellar Magnetism, 92.

Porter J.M.: 1997,A&A, 324, 597.

##submission.downloads##

Опубліковано

2010-12-02

Номер

Розділ

Статті