COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2549 Konkoly Observatory Budapest 11 July 1984 HU ISSN 0374-0676 SPECTRAL TYPES OF ECLIPSING BINARIES 37 eclipsing binaries were observed by the author utilizing the 2.1-m telescope and image-intensified White spectrograph of the Kitt Peak Observatory. 46 A/mm was achieved on forming gas baked IIIa-J plates in the second order blue. The spectra were well-exposed from nearly H12 to the Na I D-lines near 5900 A. With the exception of V766 Sgr (which was underexposed), all plates were of good quality. The spectrum of each star was visually classified by comparison with the MK classes of known standard stars. Table I contains Table I Spectral Types Variable UT Date (1983) SP. Type Previous SP. Type UU And Jul 17.472 A8IV/V F5 XZ And Jul 18.463 A1 V A0, A4 IV, A4 V CZ Aqr Jul 18.451 A7 V A5 YZ Aql Jul 17.251 A2 III A3 V343 Aql Jul 16.362 A0 V A2, A0 V, B9 V TY Cap Jul 17.347 A2/3 V A5 AQ Cas Jul 18.457 B3 V B3+ B9 FV Cas Jul 17.460 A0 V - BB Cep Jul 17.447 F1 V G0 KV Cyg Jul 17.340 B1 V B0 V687 Cyg Jul 16.343 A0 V A1 V698 Cyg Jul 16.369 A7 IV B2 V728 Cyg Jul 16.404 A0 V A0 TT Del Jul 16.432 A1 V A1 AV Del Jul 16.439 F8 V F8 BS Del Jul 16.451 G0 V - SZ Her Jul 18.145 F0 V (comp) A0, A3, A5, F0 V, F4 V TU Her Jul 16.219 F0 III/IV F5 BO Her Jul 16.326 A7 V A7 CC Her Jul 18.159 A1 V (p Sr) A0 CT Her Jul 16.206 A3 V A0, A3 V TW Lac Jul 17.438 A3 IV A2 RV Lyr Jul 16.335 A3 V A EW Lyr Jul 16.291 A8/9 V F0 SW Oph Jul 16.187 A3 V A0 SZ Oph Jul 16.226 A9 III A V535 Oph Jul 17.231 B9 V(p) A3 UX Peg Jul 18.444 G5 V A2 SX Psc Jul 17.479 A7 V F1 UZ Sge Jul 16.396 A3 V A0 V524 Sgr Jul 17.302 F8 III F8 V766 Sgr Jul 17.259 A6/9(e) -- BS Sco Jul 17.267 B5 V F8 CT Sct Jul 17.287 B7 V(n) A2 VV Vul Jul 17.366 A2/3 V -- AX Vul Jul 17.358 A1 V A2 BQ Vul Jul 16.413 A0 IV A0 the spectral types and plate information. The previous spectral type listed is usually from the GCVS. Individual comments for some of the stars follow. AQ Cas: A detailed investigation of the spectral changes was published by Struve (1946). The current spectrum was solely that of a B3 V star with the helium lines perhaps slightly enhanced in strength. No trace of either the secondary or any emission was seen. SZ Her: The spectrum of the primary has been stated to be variable. The plate obtained showed conflicting criteria, The spectrum is likely composite as both the G-band and lambda4226 seemed suppressed, though the H and K lines were approximately equal in intensity. CC Her: Strontium seems slightly enhanced in the spectral of this star. V535 Oph: The spectrum is unusual in having a typical B9 V spectrum with an unusually strong K-line of an intensity more befitting a mid-A type. This may be a function of composite nature but if so, remains the sole indication of the second star. ELAINE M. HALBEDEL* Corralitos Observatory P.O. Box 16314 Las Cruces, NM 88004 U.S.A. *Visiting Astronomer, Kitt Peak Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc., which is operated under contract with the National Science Foundation. Reference: Struve, O., 1946, Ap.J., 104, 253 [BIBCODE 1946ApJ...104..253S ]