Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..343k&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 11, May 1985, p. 343-350) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, May-June
Astronomy and Astrophysics
Astronomy
Abundance, Globular Clusters, Helium, Horizontal Branch Stars, Stellar Spectra, Stellar Spectrophotometry, Galactic Evolution, Interstellar Extinction, Stellar Atmospheres, Stellar Gravitation, Stellar Temperature
Scientific paper
The spectra of six globular cluster stars have been obtained using a 500-channel photon counter on a 6-m telescope. The 4026- and 4471-A He I lines are found to occur in the spectra of the program stars that are located above the horizontal branch in the color-magnitude diagram (M3 II-57 and M13 B29), as well as in the horizontal branch star M13 II-25. In M13 AJ-110, only the intensity at 4026 A is estimated since the spectrum is limited to 3900-4400 A. The equivalent width of the 4026-A line is 1.8 and 1.3 A in AJ-110 and II-25, respectively. The absence of the He lines from the spectra of two stars in M92 (III-27 and II-40) does not necessarily mean that their atmospheres are helium-poor, since in this case the log g values of the 4026-A He I equivalent widths, even for a normal He abundance, should be no more than 0.5 A, the line detection limit of the spectrograms obtained in this study.
Gerashchenko A. N.
Kadla Z. I.
Yablokova N. V.
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