Discovery of a Possibly Rotation Induced Resonant Coupling of Two Nonradial Pulsation Modes in Gamma-Arae = B1LB

Details Discovery of a Possibly Rotation Induced Resonant Coupling of Two Nonradial Pulsation Modes in Gamma-Arae = B1LB Discovery of a Possibly Rotation Induced Resonant Coupling of Two Nonradial Pulsation Modes in Gamma-Arae = B1LB

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140...72b&link_type=abstract

Astronomy and Astrophysics, Vol.140, NO. 1, P. 72, 1984

Astronomy and Astrophysics

Astrophysics

13

Scientific paper

The first discovery that is based on line profile variations, of stable nonradial pulsations in an early type supergiant is reported. Two periods, P1 = 0.87 d and P2 = 0.17 d have been found in γ Ara and identified with two sectorial modes of orders l1 =2 and l2= 10. A big discrepancy is noted between these periods and most quasi periods and periods which other observers have found by means of different observing techniques and interpreted as nonradial pulsations of early type supergiants. The two pulsation modes of γ Ara are resonantly coupled, and this second discovery of the "magic" number 5 as the ratio of the two mode orders supports the previous conclusion (Baade, 1984) that for this ratio the mode coupling is the strongest. The episodic character of the line profile variability and the absence of stable nonradial pulsations in the very similar star ρ Leo (Smith and Ebbets, 1981) are hence re-interpreted as a lack of stabilization through resonant coupling. The unusually rapid rotation of γ Ara and the normal v sin i of ρ Leo are in accord with the earlier suggestion (Baase 1984) that resonant mode coupling of nonradial pulsations is favoured by rapid rotation.

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