Stromgren photometry of the supergiants HD 4841 (B5 IA) and HD 194279 (B2 IA)

Adelman S. J., YÜCE K.

BALTIC ASTRONOMY, cilt.16, sa.3-4, ss.311-326, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 16 Sayı: 3-4
  • Basım Tarihi: 2007
  • Dergi Adı: BALTIC ASTRONOMY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.311-326
  • Anahtar Kelimeler: stars : supergiants, variable : general, stars : individual (HD 4841, HD 194279), GALACTIC B-SUPERGIANTS, SUPER-GIANTS, TIME-SERIES, MASS-LOSS, VARIABILITY, SPECTRA, ALPHA
  • Ankara Üniversitesi Adresli: Evet

Özet

This paper investigates the photometric variability of the B la type supergiants HD 4841 and HD 194279 in the Stromgren four-color uvby system. The data are from the 0.75 m Four College Automated Photoelectric Telescope (FCAPT) of the Fairborn Observatory, Arizona, and the 0.4 m telescope of the TUBITAK National Observatory (TUG), Turkey. These two supergiants exhibit total amplitudes of the order of 0.10 mag in all filters. TUG photometry with several observations per night suggests a more rapid variability than the once per night Arizona photometry. If the variability is periodic, then the periods are likely to be of the order of I day.