The nature of the Cepheid T Antliae

Details The nature of the Cepheid T Antliae The nature of the Cepheid T Antliae

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...407..325t&link_type=abstract

Astronomy and Astrophysics, v.407, p.325-334 (2003)

Astronomy and Astrophysics

Astrophysics

12

Stars: Distances, Stars: Variables: Cepheids, Galaxy: Open Clusters And Associations: Individual: T Ant

Scientific paper

The variable star T Antliae, sometimes suspected to be a type II pulsator, is demonstrated to be a classical Cepheid in the third crossing of the instability strip. It exhibits a positive period change of +0.514 +/- 0.016 s yr-1, consistent with a star on the blue side of the instability strip and evolving through it for the third time. The Cepheid exhibits no random fluctuations in pulsation period, although superimposed upon its evolutionary O-C trend are very subtle variations that may be indicative of orbital motion about an unseen companion. Archival spectroscopic data also indicate that the star sits on the edge of a putative cluster of B-type stars that may be physically associated with the Cepheid. Additional photometric and spectroscopic data for the Cepheid and cluster are needed to strengthen the case. The field reddening of T Ant established from nearby early-type stars is EB-V=0.30 +/- 0.01 (EB-V(B0)=0.316 +/- 0.014).

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