Zobrazeno 1 - 10
of 675
pro vyhledávání: '"Luck, R."'
Autor:
Luck, R. Earle
Parameters and abundances have been derived for 435 Cepheids based on an analysis of 1127 spectra. Results from five or more phases are available for 52 of the program stars. The latter set of stars span periods between 1.5 and 68 days. The parameter
Externí odkaz:
http://arxiv.org/abs/1808.05863
Autor:
Luck, R. Earle
Parameters and abundances for 1002 stars of spectral types F, G, and K of luminosity class IV and V have been derived. After culling the sample for rotational velocity and effective temperature, 867 stars remain for discussion. Twenty-eight elements
Externí odkaz:
http://arxiv.org/abs/1611.02897
Autor:
Luck, R. Earle
Parameters and abundances for 1133 stars of spectral types F, G, and K of luminosity class III have been derived. In terms of stellar parameters, the primary point of interest is the disagreement between gravities derived with masses determined from
Externí odkaz:
http://arxiv.org/abs/1507.01466
Akademický článek
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Autor:
Korotin, S. A., Andrievsky, S. M., Luck, R. E., Lepine, J. R. D., Maciel, W. J., Kovtyukh, V. V.
We have performed a NLTE analysis of the infrared oxygen triplet for a large number of cepheid spectra obtained with the Hobby-Eberly telescope. These data were combined with our previous NLTE results for the stars observed with Max Planck Gesellscha
Externí odkaz:
http://arxiv.org/abs/1408.6103
The determination of pulsation mode and distance for field Cepheids is a complicated problem best resolved by a luminosity estimate. For illustration a technique based on spectroscopic luminosity discrimination is applied to the 4.47d s-Cepheid FF Aq
Externí odkaz:
http://arxiv.org/abs/1306.1228
Autor:
Andrievsky, S. M., Lepine, J. R. D., Korotin, S. A., Luck, R. E., Kovtyukh, V. V., Maciel, W. J.
We derived the barium atmospheric abundances for a large sample of Cepheids, comprising 270 stars. The sample covers a large range of galactocentric distances, from about 4 to 15 kpc, so that it is appropriated to investigate the existence of radial
Externí odkaz:
http://arxiv.org/abs/1210.6211
Autor:
Luck, R. Earle, Lambert, David L.
This paper reports on the spectroscopic investigation of 238 Cepheids in the northern sky. Of these stars, about 150 are new to the study of the galactic abundance gradient. These new Cepheids bring the total number of Cepheids involved in abundance
Externí odkaz:
http://arxiv.org/abs/1108.1947
This paper reports on the spectroscopic investigation of 101 Cepheids in the Carina region. These Cepheids extend previous samples by about 35% in number and increase the amount of the galactic disk coverage especially in the direction of l \approx 2
Externí odkaz:
http://arxiv.org/abs/1106.0182
Autor:
Kovtyukh, V. V., Soubiran, C., Luck, R. E., Turner, David G., Belik, S. I., Andrievsky, S. M., Chekhonadskikh, F. A.
Accurate and homogeneous atmospheric parameters (Teff, log (g), Vt, [Fe/H]) are derived for 74 FGK non-variable supergiants from high-resolution, high signal-to-noise ratio, echelle spectra. Extremely high precision for the inferred effective tempera
Externí odkaz:
http://arxiv.org/abs/0807.2057