Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050)

Details Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050) Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050)

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..177f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 177-183.

Astronomy and Astrophysics

Astrophysics

23

B Stars, Stellar Oscillations, Variability, Line Spectra, Spectral Line Width, Stellar Atmospheres, Stellar Envelopes, Stellar Spectrophotometry, Time Series Analysis

Scientific paper

The detection of a multifrequency in rapid variations of the equivalent width and profile of He I 6678 is reported. Strong bumps (not greater than 1.5 percent of the continuum) moving from blue to red through the line profile were observed. EW Lac is the first Be star for which very good agreement exists between frequencies previously discovered from photometric variations and those displayed in spectroscopic data. The three common frequencies (2.75, 1.60, and 1.25 c/d) are interpreted in terms of nonradial pulsations and are associated with retrograde sectorial modes l = m = 6, 4, and 2, respectively. A fourth frequency (0.45 c/d), only detected in spectroscopy, could be caused by the rotation of inhomogeneities located near the base of the stellar envelope. EW Lac appears to be a very good candidate for multisite photometric and spectroscopic campaigns to study the role of nonradial pulsations in connection with mass loss in Be stars.

Affiliated with

Also associated with

No associations

Rating

Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Short-term spectroscopic variability of the Be star EW Lacertae (HD 217050) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1868151