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β Cephei and SPB stars in the Large Magellanic Cloud

Published online by Cambridge University Press:  12 April 2016

Z. Kołaczkowski ,
A. Pigulski ,
I. Soszyński ,
A. Udalski ,
M. Szymański ,
M. Kubiak ,
K. Żebruń ,
G. Pietrzyński ,
P.R. Woźniak  and
O. Szewczyk
...Show all authors
Z. Kołaczkowski
Affiliation:
Wrocław University Observatory, Kopernika 11, 51-622 Wrocław, Poland
A. Pigulski
Affiliation:
Wrocław University Observatory, Kopernika 11, 51-622 Wrocław, Poland
I. Soszyński
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
A. Udalski
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
M. Szymański
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
M. Kubiak
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
K. Żebruń
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
G. Pietrzyński
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
P.R. Woźniak
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
O. Szewczyk
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
L. Wyrzykowski
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

Abstract

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This is a progress report of the study of pulsating main-sequence stars in the LMC. Using the OGLE-II photometry supplemented by the MACHO photometry, we find 64 β Cephei stars in the LMC. Their periods are generally much longer than observed in stars of this type in the Galaxy (the median value is 0.27 d compared with 0.17 d in the Galaxy). In 20 stars with short periods attributable to the β Cephei-type instability, we also find modes with periods longer than ~0.4d. They are likely low-order g modes, which means that in these stars both kinds of variability, β Cephei and SPB, are observed. We also show examples of the multiperiodic SPB stars in the LMC, the first beyond our Galaxy.

Type
Part 4. Early-type stars: B, A and F pulsators
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 225 - 229
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

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