Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers

Details Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..333s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 333-345. Research supported by NSERC and Erindale Co

Astronomy and Astrophysics

Astrophysics

39

Atmospheric Boundary Layer, Cepheid Variables, Infrared Spectroscopy, Line Shape, Line Spectra, Stellar Atmospheres, Atmospheric Models, High Resolution, Mira Variables

Scientific paper

The first analysis of high-resolution IR spectra at 1.08 and 1.6 microns is presented for classical Cepheid variables. Three of the seven program stars were observed with complete phase coverage. The photospheric lines in the spectra were measured for asymmetries and compared to synthetic profiles from model atmospheres. An additional absorption component is shown to appear at certain phases in the 1.08 micron lines of X Sgr, Delta Cep, Eta Aql, and possibly T Mon. The kinematics of this component is similar to that observed in line-doubling IR spectra of Mira variables. This resemblance suggests the existence of pulsationally driven shock waves in the atmospheres of Cepheids to explain their IR line asymmetries and splitting. The systematically larger Baade-Wesselink radii derived earlier for Eta Aql and X Sgr are confirmed. The magnitude of the effect is about 20 percent.

Affiliated with

Also associated with

No associations

Rating

Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers 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 Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared spectroscopy of Cepheids. II - Line profiles from different atmospheric layers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1302328