Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/

Details Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/ Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..927s&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 927-947.

Astronomy and Astrophysics

Astrophysics

44

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

Scientific paper

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).

Affiliated with

Also associated with

No associations

Rating

Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/ 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 Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonradial pulsation in IOTA Herculis and 10 Lacertae /1975-1977/ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-939037