Title of article :
Two new bright Ae stars
Author/Authors :
Monin، D. N. نويسنده , , Wade، G. A. نويسنده , , Fabrika، S. N. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Abstract :
Two newly identified Ae stars, (nu)Cyg and (kappa)UMa, were discovered in the course of the Magnetic Survey of Bright main sequence stars (Monin et al. 2002). We present their H (alpha)profiles along with measurements of their equivalent width and parameters of emission features. Emission in the H (alpha) line of (nu)Cyg is variable on a time scale of 3 years. (kappa)UMa exhibits weak emission which is rather stable. The emission is thought to arise from a circumstellar disk, and we have estimated the size of that disk.Both new emission stars are IRAS sources. Their IR color excesses are consistent with those of classical Ae stars. Thus, (nu) Cyg and (kappa) UMa appear not to belong to the class of Herbig Ae/Be stars. We argue that the frequency of Ae stars may be underestimated due to the difficulty of detection of weak emission in some A stars.
Keywords :
stars: individual: (nu)Cyg , stars: individual: (kappa)UMa , stars: emission line, Be
Journal title :
Astronomy and Astrophysics
Journal title :
Astronomy and Astrophysics