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Line Profile Variations in the Spectra of the γ Dor Star HR 2740

Published online by Cambridge University Press:  08 February 2017

E. Poretti ,
L. Mantegazza ,
C. Koen ,
P. Martinez ,
F. Breuer ,
D. De Alwis  and
H. Haupt
E. Poretti
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 22055 Merate, Italy
L. Mantegazza
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 22055 Merate, Italy
C. Koen
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
P. Martinez
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
F. Breuer
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
D. De Alwis
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
H. Haupt
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa

Extract

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HR 2740 was a target for a photometric campaign carried out at La Silla (ESO) and Sutherland (SAAO) from 1997 January 14 to 1997 February 11 (Poretti et al., 1997). The campaign revealed that HR 2740 is one of the brightest γ Dor stars, a class of variable stars located near the cool border of the instability strip, and in which gravity pulsation modes are excited. Four frequencies were identified (f1=1.0434, f2=0.9951, f3=1.1088, f4=0.9019 c d−1), which together yield a satisfactory solution to the observed light curve. The frequency analysis was not simple, but thanks to the large coverage in longitude we could separate the effect of aliasing on the two terms f3=1.1088 c d−1 and f4=0.9019 c d−1, linked by the relationship f4 = 2 - f3. Moreover, only the long time baseline allowed us to resolve the two close terms f1=1.0434 c d−1 and f2=0.9951 c d−1. See Poretti et al. (1997) for a detailed discussion.

Type
VI. Asteroseismology II
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 387 - 388
Copyright
Copyright © Kluwer 1998 

References

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