FN Aquilae - an unusual Cepheid with anomalous CNO abundances

Details FN Aquilae - an unusual Cepheid with anomalous CNO abundances FN Aquilae - an unusual Cepheid with anomalous CNO abundances

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...377..156u&link_type=abstract

Astronomy and Astrophysics, v.377, p.156-160 (2001)

Astronomy and Astrophysics

Astrophysics

7

Stars: Abundances, Stars: Variables: Cepheids

Scientific paper

Spectroscopic analysis of the classical Cepheid FN Aql from three high-resolution CCD spectra near minimum and maximum light gives the following results: 1) Mean Teff=5483 K; log g=1.25 and Vt=4.0 km s-1; 2) Metallicities derived for each phase are consistent with each other and close to the solar value; 3) The Cepheid is crossing the instability strip for at least the third time. 4) It has anomalously low carbon ([C/H]=-0.93 dex) and nitrogen ([N/H]=+0.09 dex) abundances, which is unusual for a Cepheid not crossing the instability strip for the first time. Since FN Aql is an IRAS object and candidate protoplanetary nebulae according to Volk & Kwok (\cite{vok89}), we assume that the star's peculiarities are caused either by envelope loss after the second dredge-up or that it is an unusual Cepheid for which existing nucleosynthesis and mixing models are unable to reproduce the CNO abundance pattern. Based on spectra collected with the 6 m telescope SAO RAS.

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