Spectroscopic investigations of classical Cepheids and main-sequence stars in galactic open clusters and associations. II. Open cluster Platais 1 (C2128+488) and small-amplitude Cepheid V1726 Cygni

Details Spectroscopic investigations of classical Cepheids and main-sequence stars in galactic open clusters and associations. II. Open cluster Platais 1 (C2128+488) and small-amplitude Cepheid V1726 Cygni Spectroscopic investigations of classical Cepheids and main-sequence stars in galactic open clusters and associations. II. Open cluster Platais 1 (C2128+488) and small-amplitude Cepheid V1726 Cygni

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..885u&link_type=abstract

Astronomy and Astrophysics, v.376, p.885-891 (2001)

Astronomy and Astrophysics

Astrophysics

5

Galaxy: Open Clusters: And Associations, Stars: Abundances, Stars: Cepheids, Stars: General

Scientific paper

The small-amplitude Cepheid V1726 Cyg and two members of open cluster Platais 1 (Platais 1 star No. 1 (1921) and Platais 1 star No. 111 (1600)) were investigated, using high-resolution CCD spectra. The following results were obtained: 1) All objects have the same metallicities, close to that of the Sun (for V1726 Cyg weighted average [Fe/H]=+0.05, for Platais 1 star No. 1 (1921) [Fe/H]=+0.13); 2) values of Teff and log g for the B-stars are in excellent agreement with those determined from (B-V) colour indices using a (B-V) ~ (Teff, log g) calibration; 3) the elemental abundances indicate that V1726 Cyg is in the post first dredge-up stage with an age near 1.5 x 108, and is crossing the Cepheid instability strip for the third time. Mean values of Teff=6100 K and log g=2.35 +/- 0.05 permit us to refine its colour excess to EB-V=0fm 33, which for a distance of d = 1568+/- 13 pc corresponds to MV=-2fm 99. The Cepheid could therefore be pulsating in the fundamental tone, although pulsation in the first overtone is not excluded; 4) Platais 1 Star No. 1 (1921) is a slowly rotating HgMn-star with a high helium content, while Platais 1 star No. 111 (1600) is a rapidly rotating main-sequence star with a helium content comparable to that of the Sun; 5) the age of the open cluster is estimated to be about 2.5 x 108 yr. Based on the spectra collected with the 6-m telescope SAO RAS.

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