• I. A. Usenko Astronomical Observatory, Odessa National University, Ukraine
  • V. V. Kravtsov Sternberg Astronomical Institute, Moscow University, Russian Federation
  • V. V. Kovtyukh Astronomical Observatory, Odessa National University, Russian Federation
  • L. N. Berdnikov Sternberg Astronomical Institute, Moscow University, Russian Federation
  • A. Yu. Knyazev South African Large Telescope, South Africa
  • R. Chini Astronomisches Institut, Ruhr-Universität Bohum, Germany
  • A. B. Fokin Institute of Astronomy, Russian Academy of Sciences, Russian Federation


Ключові слова:

Stars, Cepheids, stars, individual, l Car


Thirty three spectra (one spectrum for the each of 33 observational nights) have been performed to coverall pulsational period of the 35.5-days Cepheid l Car. Due to these data we have obtained for the first time the detailed curves of effective temperature, gravity and turbulent velocity. Curves of gravity and turbulent velocity show complicated changes, connected probably with dynamics of extensive Cepheid’s atmosphere. The mean atmosphere parameters of l Car are: Teff =4984±15K; log g = 1.13; Vt =6.67kms−1. Having a solar metallicity [Fe/H]=+0.02dex, this Cepheid demonstrate sudden results for the ”key” elements abundances of yellow supergiants evolution, – all they are close to the solar ones. In this case l Car resembles  to SV Vul, – Cepheid with 45-days pulsational period and nearly like spectral type. It is possible that l Car is an object crossing the Cepheids instability strip for the first time. The content of other elements is close to solar one too.


Berdnikov L.N.: 2013, private communication.

Berdnikov L.N., Mattei J.A., Beck S.J.: 2003, JAAVSO, 31,146.

Galazutdinov G.A.: 1992, Preprint SAO RAS, No.92

Kervella P., M´erand A., Perrin G., Coud´e du Foresto V.: 2006, A&A, 448 623.

Kovtyukh V.V., Andrievsky S.M.:1999, A&A, 351, 597.

Kovtyukh V.V., Gorlova N.I: 2000, A&A, 358, 587.

Kurucz R.: 1992, In: The Stellar Populations of Galaxies, (eds) B.Barbuyand A. Renzini, IAU Symp., 149, 225.

Luck R.E., Kovtyukh V.V., Andrievsky S.M.: 2001, A&A, 373, 589.

Luck R.E., Gieren W.P., Andrievsky S.M., Kovtyukh

V.V., Fouqu´e P., Pont F. & Kienzle F.:2003, A&A, 401, 939.

Nardetto N., Mourad D., Kervella P., Mathias Ph.,

M´erand A., Bersier D.: 2006, A&A, 453, 309.

Simon N.R. & Kanbur S.M.: 1995, ApJ, 451, 703.

Usenko I.A., Kniazev A.Yu., Berdnikov L.N., Kravtsov V.V.: 2011, AstL, 37, 499.