Abstract
view Abstract Citations (49) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Nonradial pulsation in Iota Herculis and 10 Lacertae (1975 - 1977). Smith, M. A. Abstract Model line profiles are fitted to observations of two line-profile-variable B stars, Iota Her (B3 IV) and 10 Lac (O8 III), which straddle the Beta Cep strip. The periods observed in the two stars are confirmed; the lengths of the periods and the success in profile fitting suggest that the observed profile variations can only be identified with g-mode direct traveling waves. Both stars are shown to be complex nonradial pulsators capable of changing their amplitudes and periods on a time scale of months. The apparent documentation in Iota Her of a change from one mode to its harmonic in 2 to 3 days is discussed, and the observed variations in line strength are correlated with pulsational phase for strong lines of several ions. These variations are attributed to changes in a 'microturbulent' velocity. The results also indicate that stars of 7 to 8 solar masses may prefer to pulsate with basic periods of 10 to 14 hr, that 10 Lac may pulsate in a harmonic of a longer basic period, and that the inclinations of both Iota Her and 10 Lac appear to be large (sin i approximately equal to unity). Publication: The Astrophysical Journal Pub Date: September 1978 DOI: 10.1086/156442 Bibcode: 1978ApJ...224..927S Keywords: B Stars; Early Stars; Periodic Variations; Variable Stars; Graphs (Charts); Pulse Amplitude; Pulse Duration; Radial Distribution; Radial Velocity; Stellar Models; Tables (Data); Traveling Waves; Wave Propagation; Astronomy; Early-Type Stars:Pulsations full text sources ADS | data products SIMBAD (7)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
