COMMISSION 27 OF THE I. A. U INFORMATION BULLETIN ON VARIABLE STARS NUMBER 228 Konkoly Observatory Budapest 3 October 1967 SPECTRAL TYPES OF LONG-PERIOD VARIABLES IN SAGITTARIUS 137 previously discovered long-period variable stars have been classified spectroscopically using plates obtained with the Warner and Swasey Observatory Schmidt telescope and a four-degree objective prism producing a dispersion of 1700 A/mm. The Kodak IN plates plus RG8 filter used cover the wavelength range 6800-8800 A. All the stars are in Harvard Variable Star Field 193 in Sagittarius centered at 18^h23^m, -23d. The variables were classified on the Case system as described by Nassau and Velghe (1), and the resulting Case spectral subtypes were adjusted to the Mt. Wilson system using the relation derived by Blanco (2). Approximately half of the types listed are based on only one spectral classification. The number of plates on which the star was classified is given in column 5 of the tables. When subtypes obtained from two or more plates differ significantly, both are given, separated by a dash. The approximate standard error of a single spectral classification is 8 subtypes for classes earlier than M6 and 4 subtypes for classes M6 and later (3). It has been shown (3) that larger-amplitude, long-period variables undergo spectral variations with phase amounting to several subtypes. The spectral type at maximum light would be most valuable for statistical studies, but in the case of these stars the data available were insufficient for this to be achieved. Therefore it should be kept in mind that all the spectral types listed below were obtained at unknown phases. Table 1 contains data for variables which already have a variable star designation in the General Catalogue of Variable Stars (4). Stars listed in Table 2 do not yet have a variable star designation, and each is designated by the number it was assigned in the paper listed in the reference column. TABLE 1 Var. Star Coordinates (1900) Spectral No. of Reference Designation R.A. 18^h Dec. Type Plates No. V1837 Sgr 10^m02^s -27d24'.9 M5 1 10 V1845 Sgr 12 05 -24 51.2 M7 2 9 V1649 Sgr 12 09 -24 00.4 M8 1 8 V506 Sgr 12 09 -25 43.7 M7 1 6 V507 Sgr 12 18 -25 54.8 M5-6 2 6 V1852 Sgr 13 11 -24 08.5 M6-8 2 10 V510 Sgr 14 14 -26 03.7 M7 1 6 V1650 Sgr 15 16 -23 17.6 M3-8 2 8 V511 Sgr 15 39 -25 04.1 M1-5 3 6 V1862 Sgr 15 42 -27 28.1 M4 1 10 V1652 Sgr 15 53 -26 41.7 M3-5 2 8 V512 Sgr 15 54 -26 06.9 M3-6 2 6 V1653 Sgr 15 56 -26 33.0 M7 1 8 GO Sgr 16 03 -25 57.8 M7-8 2 12 GQ Sgr 16 33 -24 56.3 M4 2 13 V1868 Sgr 17 06 -24 40.2 M5:-7 2 10 V513 Sgr 17 42 -25 34.5 M3 1 6 V514 Sgr 18 08 -25 56.3 M4 2 6 V1655 Sgr 18 26 -25 04.2 M6-7 2 8 V1657 Sgr 18 59 -23 09.2 M2 2 8 V515 Sgr 19 06 -25 28.9 M7 2 8 GY Sgr 19 23 -27 28.1 M4 1 10 GZ Sgr 19 29 -23 48.1 M7 1 13 V1659 Sgr 20 06 -22 30.7 M5-6 2 8 HK Sgr 20 06 -24 42.2 M7-8 3 12 V1877 Sgr 20 14 -23 56.9 M7 1 9 HO Sgr 20 45 -25 44.2 M10 2 13 V1661 Sgr 20 59 -21 11.7 M8 2 8 V517 Sgr 21 34 -26 00.0 M7 1 6 V518 Sgr 21 48 -26 21.2 M6 1 6 V519 Sgr 21 49 -26 00.1 M8 1 6 HT Sgr 22 12 -25 44.7 M4-8 2 13 V520 Sgr 22 18 -25 51.4 M5-8 2 6 V1664 Sgr 22 20 -24 55.8 M3: 1 8 V1890 Sgr 22 52 -27 06.1 M4 1 10 HU Sgr 22 54 -25 08.3 M7 2 12 V1666 Sgr 23 03 -25 04.7 M4-6: 2 8 V1667 Sgr 23 18 -24 58.8 M6-8 2 8 HV Sgr 23 28 -26 30.5 M2 1 10 V1891 Sgr 24 01 -24 19.5 M7-8 3 9 V1669 Sgr 24 13 -25 09.5 M3 1 8 V1672 Sgr 24 37 -21 14.8 M4 2 8 V1673 Sgr 25 06 -25 20.1 M7 1 8 V1674 Sgr 25 11 -25 09.4 M8 1 8 IK Sgr 25 24 -24 51.9 M7 1 9 V1676 Sgr 25 36 -23 48.9 M7 2 8 V1677 Sgr 25 38 -22 47.9 M7 3 8 IL Sgr 25 39 -25 43.7 M2 1 12 V1678 Sgr 25 52 -22 26.2 M7 2 8 IM Sgr 25 53 -25 17.6 M9 1 4 V1900 Sgr 26 01 -24 50.9 M3 2 9 V1902 Sgr 26 16 -24 53.8 M7 1 10 V1680 Sgr 26 22 -23 20.5 M4 1 8 LS Sgr 26 25 -25 34.9 M7 2 10 V1681 Sgr 26 38 -23 41.8 M5-8 2 8 LT Sgr 26 40 -25 22.3 M3 1 10 V1682 Sgr 26 44 -23 55.6 M5-7 3 8 IP Sgr 26 51 -26 39.5 M3 1 13 V1683 Sgr 27 05 -20 59.0 M7 1 8 V1684 Sgr 27 05 -25 10.4 M7 1 8 IQ Sgr 27 16 -25 10.8 M7-8 3 8 V1904 Sgr 27 17 -24 09.8 M5 3 9 V1685 Sgr 27 23 -20 43.9 M5: 1 8 IS Sgr 27 39 -25 13.6 M8-9 2 10 V1907 Sgr 27 49 -20 17.4 M7 1 10 LU Sgr 27 51 -25 37.9 M9 2 10 V1687 Sgr 27 55 -20 53.8 M4 1 8 V1908 Sgr 27 59 -24 57.6 M7 2 9 V1688 Sgr 28 30 -23 32.4 M8 2 8 V1910 Sgr 28 42 -27 06.0 M6: 1 10 V1690 Sgr 28 50 -21 20.2 M7 2 8 V1691 Sgr 28 51 -22 09.8 M8 2 8 V1913 Sgr 28 56 -26 45.4 M7 1 10 V1692 Sgr 29 08 -19 21.2 M9 1 8 V1914 Sgr 29 12 -22 20.5 M4 2 9 V1693 Sgr 29 14 -19 12.7 M4 2 8 V1694 Sgr 29 15 -21 41.4 M5-7 2 8 IV Sgr 29 29 -24 13.9 non-M 2 12 V1696 Sgr 29 42 -25 20.3 M5-7 2 8 V1697 Sgr 30 01 -22 12.1 M6 2 8 IZ Sgr 30 33 -21 04.0 M6 2 13 V1699 Sgr 30 50 -22 37.1 M3 1 8 V1700 Sgr 31 15 -21 23.8 M4 2 8 V1917 Sgr 31 31 -20 16.8 M5 1 10 V1918 Sgr 31 37 -20 58.3 M7: 1 11 BT Sgr 31 37 -24 35.5 M6 2 5 V1701 Sgr 31 43 -24 32.6 M6-7 2 8 KL Sgr 31 57 -23 59.2 M5 1 10 V1920 Sgr 32 20 -20 35.4 M2 1 9 KM Sgr 32 43 -23 58.1 M7 1 12 V1702 Sgr 33 05 -20 48.8 M6 1 8 V1922 Sgr 33 05 -25 22.3 M8 2 10 V1923 Sgr 33 30 -25 07.7 M3 1 10 KN Sgr 33 32 -25 00.4 M4-8 2 15 V1703 Sgr 34 25 -18 48.8 M6 1 8 V1704 Sgr 34 27 -20 54.3 M7 1 8 V1926 Sgr 35 18 -24 04.0 M8 1 10 V1705 Sgr 35 19 -19 26.8 M5 1 8 V1706 Sgr 35 24 -19 48.7 M7: 1 8 V1707 Sgr 35 58 -20 15.5 M2 1 8 V1927 Sgr 36 08 -22 35.8 M7 1 9 V1929 Sgr 36 22 -25 22.2 M5 1 10 TABLE 2 Variable Coordinates (1900) Spectral No. of Reference Star No. R.A. 18^h Dec. Type Plates No. 2 07^m44^s -27d32.'0 M4 1 13 5 14 07 -23 32.3 M7 2 13 3 18 18 -22 54.0 M7 1 18 4 18 25 -23 50.0 M4 1 17 4 18 37 -23 22.9 M7 2 18 8 20 03 -19 44.8 M6 1 15 9 20 15 -21 53.6 M6 4 13 6 20 45 -22 49.5 M8 1 17 7 20 48 -21 10.9 M6 2 17 6 22 27 -23 16.6 M4-7 2 18 8 22 45 -25 51.6 M6 1 17 5 23 11 -21 40.1 M4-7 3 14 7 23 12 -22 06.3 M7 1 18 9 23 20 -24 27.9 M5 1 17 16 23 48 -19 07.8 M7 1 13 11 24 26 -22 27.6 M3 1 17 12 24 38 -23 42.5 M5-6 2 17 4 24 43 -22 01.8 M7 3 16 4 24 45 -23 09.7 M7 1 19 10 25 27 -22 39.5 M2 1 15 14 26 31 -23 18.6 M7 2 17 22 26 35 -22 17.8 M7 1 13 6 27 14 -22 56.5 M7 1 16 15 28 02 -24 29.9 M7 3 17 16 28 45 -23 57.6 M7 3 17 26 29 33 -21 07.8 M4 2 13 30 30 59 -26 15.6 M7 1 13 HV9486^+ 31 56 -27 03.7 M7 1 12 20 32 14 -25 38.2 M6 3 17 21 32 41 -23 10.7 M5 2 17 32 34 27 -24 07.6 M7 1 13 16 35 01 -25 34.9 M6 1 15 9 35 07 -24 07.8 M7 1 14 23 35 16 -25 49.2 M5 1 17 10 36 26 -26 20.2 M3 1 14 ^+ HV9486=4249 in the Catalogue of Stars Suspected of Variability (7) Some of the classifications were made during work on a doctoral thesis at Case Institute of Technology. The others were made while I was at the Maria Mitchell Observatory in August, 1967. In all cases, identification charts were provided by Dr. Hoffleit. September 27, 1967 NANCY HOUK Maria Mitchell Observatory Nantucket, Mass. (now at the Warner and Swasey Observatory East Cleveland, Ohio) References: 1. Nassau, J.J. and Velghe, A.G. 1964, Astrophys. J., 139, 190. [BIBCODE 1964ApJ...139..190N ] 2. Blanco, V.M. 1964, Astr. J., 69, 730. [BIBCODE 1964AJ.....69..730B ] 3. Houk, N. 1967, Doctoral thesis, Case Institute of Technology, Cleveland. [BIBCODE 1967PhDT.........8H ] 4. Kukarkin, B.V., Parenago, P.P., Efremov, Yu.I., and Kholopov, P.N. 1958, General Catalogue of Variable Stars (2nd ed.; Moscow: Acad. Sci. U.S.S.R.) [[BIBCODE 1958oikp.book.....K ] 5. Bailey, S.I. 1923, Harvard Bull., 781. 6. Shapley, H. and Swope, H.H. 1934, Harvard Ann., 90, 177. [BIBCODE 1940AnHar..90..177S ] 7. Kukarkin, B.V., Parenago, P.P., Efremov, Yu.I., and Kholopov, P.N. 1951, Catalogue of Stars Suspected of Variability (Moscow: Acad. Sci. U.S.S.R.) [BIBCODE 1951CSV...C......0K ] 8. Hoffleit, D. 1957, Astr. J., 62, 120. [BIBCODE 1957AJ.....62..120H ] 9. " " 1958, Astr. J., 63, 78. [BIBCODE 1958AJ.....63...78H ] 10. " " 1959, Astr. J., 64, 147. [BIBCODE 1959AJ.....64..147H ] 11. " " 1959, Astr. J., 64, 241. [BIBCODE 1959AJ.....64..241H ] 12. " " 1960, Astr. J., 65, 100. [BIBCODE 1960AJ.....65..100H ] 13. " " 1961, Astr. J., 66, 188. [BIBCODE 1961AJ.....66..188H ] 14. " " 1962, Astr. J., 67, 228. [BIBCODE 1962AJ.....67..228H ] 15. " " 1963, Astr. J., 68, 207. [BIBCODE 1963AJ.....68..207H ] 16. " " 1964, Astr. J., 69, 301. [BIBCODE 1964AJ.....69..301H ] 17, " " 1965, Astr. J., 70, 307. [BIBCODE 1965AJ.....70..307H ] 18, " " 1966, Astr. J., 71, 130. [BIBCODE 1966AJ.....71..130H ] 19, " " 1967, Astr. J., 72, 711 [BIBCODE 1967AJ.....72..711H ] [From IBVS 231] Corrections to IBVS No228: In a letter of October 11 Dr. Nancy Houk writes that there are the following changes to be made in her Table 1: 1. The reference (last column) for star IM Sgr should be 12, not 4. 2. On the final page of Table 1, the spectral type of star IV Sgr should be M6 rather than non-M. 3. On the same page the star BT Sgr should be omitted. Dr. Hoffleit has just informed her, that she had found that the coordinates of BT Sgr as listed in the GCVS are wrong, and that BT Sgr is the same variable as that designated as V1701 Sgr.