Results from spectral observations of known emission stars in the vicinity of Cyg OB7 are presented. 64 spectra of 9 emission stars were obtained over the period 2001-2007. The equivalent widths of the most characteristic lines for T-Tau stars were obtained in all these spectra. It is noted that all the spectral lines manifest strong variations. The spectra of these stars are in the spectral range K8-M4. Two stars (Nos. 12 and 23) have a negative Balmer jump. The forbidden [OIII] 4959 and 5007 Å and [SII] 6716/31 Å lines, which are typical of classical T-Tau stars, show up in the spectra of stars No. 23 and 86.
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Translated from Astrofizika, Vol. 63, No. 4, pp. 597-609 (November 2020)
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Melikian, N.D. Spectral Observations of Emission Stars in the Vicinity of Cyg OB7. Astrophysics 63, 523–533 (2020). https://doi.org/10.1007/s10511-020-09656-x
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DOI: https://doi.org/10.1007/s10511-020-09656-x