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28 And: Simultaneous Strömgren Photometry

Published online by Cambridge University Press:  15 February 2018

E. Rodríguez ,
A. Rolland ,
P. López de Coca ,
R. Garrido  and
E.E. Mendoza
E. Rodríguez
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado 3004, 18080 Granada, Spain
A. Rolland
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado 3004, 18080 Granada, Spain
P. López de Coca
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado 3004, 18080 Granada, Spain
R. Garrido
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado 3004, 18080 Granada, Spain
E.E. Mendoza
Affiliation:
Inst. de Astron., UNAM, Apartado Postal 70-264, CP-4510, México D.F., México

Abstract

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We have carried out simultaneous uvby photometry of the low amplitude δ Set star 28 And. Analysis of the data, using the Fourier Transform method, establishes 28 And as a monoperiodic pulsator. Using the classical O-C method, it is found that the pulsation of this star can be well described by means of a linear ephemeris with a period of P=0.d069304118 over the last twenty-four years. Amplitude variations are also shown to be present from season to season. The physical parameters of this star are determined and the nature of radial or nonradial pulsation is discussed on the basis on the derived phase shifts and amplitude ratios between Strömgren colours. The results indicate that 28 And pulsates in a nonradial mode with ℓ = 2.

Type
Windows on the Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 430
Copyright
Copyright © Cambridge University Press 1993