Johnson V and I photometry from TASS Data CD 23 (courtesy of Tom Droege) was analysed using the Welch-Stetson Statistic (Welch, D.L & Stetson, P.B. 1993, AJ, 105, 1813-1821) and a small subset of stars having the highest values of said examined.
Data for some known variables already listed in the GCVS or NSV supplement were found this way.
Some new variables were discovered with sufficient data to characterize the stars in terms of period and amplitude and also to attempt a preliminary classification. These will probably be dealt with elsewhere.
Below I present a list of 25 stars where there is strong evidence of variability within the data but insufficient to categorize the stars further.
The objects' identity, mean RA and Dec from the data measurements (TASS astrometry from this dataset has not been officially published as yet), mean Johnson V and I magnitude plus V and I amplitude range of the data recorded so far (outliers ignored in range) and notes with respect to the nature of the variable and/or intersting cross identities are given
# Object RA 2000 Dec 2000 V mag V ampl. I Mag I ampl. NOTE
GSC 0730 0498 06 12 46.8 +08 46 09 11.6 0.2 9.2 0.2 LPV = MSX5C_G200.6916-04.4811 -
0.2 V change in 28 days
GSC 0143 1718 06 13 48.5 +05 57 11 10.7 0.2 10.2 0.2 ecl P ~ 1.0 d
GSC 0143 0139 06 14 12.9 +07 28 42 10.7 0.4 10.4 0.4 ecl::
GSC 0731 2185 06 18 42.1 +08 51 20 11.2 0.4 10.5 0.3 SPV (largeish proper motion)
HD 256577 06 24 02.2 +08 18 03 9.7 0.03 9.5 0.03 bCep: 0.03 V full ampl., P ~ 0.02 d: -
= LSIV+8.5 = HBH 28-50 B2 IV: pe
GSC 0145 0717 06 25 55.3 +06 55 30 9.8 0.2 9.0 0.2 SPV Bright xray source
GSC 0732 1910 06 27 05.4 +07 36 19 10.2 0.3 9.8 0.3 pulsating variable
GSC 0732 1397 06 27 30.7 +08 25 15 10.2 0.4 10.0 0.4 ecl:
GSC 0732 3275 06 29 08.1 +09 22 06 11.2 0.3 10.6 0.2 SPV
HD 258583 06 30 22.3 +08 39 37 8.8 0.2 8.7 0.2 SPV V-I reversal! +0.1 to -0.1 A0
GSC 0733 1190 06 34 52.6 +08 18 33 11.0 0.1 10.7 0.3 SPV in open cluster NGC 2251 ?
GSC 0733 0873 06 36 34.1 +07 34 36 11.0 0.4 10.6 0.4 SPV
GSC 0746 0808 06 42 26.7 +08 17 28 11.2 0.3 10.1 0.2 LPV:
GSC 0747 1659 06 49 28.8 +08 35 02 9.7 0.2 9.4 0.2 SPV
GSC 0748 0686 06 58 30.0 +08 41 17 11.1 0.8 10.5 0.7 ecl P ~ 1.0 d or ~ 2.0 d with a min2
GSC 0175 3340 07 12 56.2 +06 04 17 11.3 0.5 9.0 0.2 LPV
GSC 0176 2479 07 18 07.8 +07 02 02 11.5 0.4 11.0 0.4 SPV
GSC 0763 0058 07 18 18.0 +08 57 29 12.3 0.9 9.0 0.4 LPV = MSX5C_G207.9268+10.0084 = BrhV109
GSC 0176 2290 07 20 38.7 +06 40 56 12.1 0.7 11.6 0.6 RS CVn::
GSC 0177 1084 07 23 34.1 +06 02 34 11.6 0.6 11.3 0.6 ecl. min2 has ampl.0.2 ~ P = 2.008 d
BD +08 1753 07 23 44.4 +08 39 56 9.4 0.2 8.4 0.2 SPV: spectrum K
GSC 0764 0509 07 24 19.3 +09 12 31 12.2 0.6 11.0 0.5 LPV:
GSC 0764 0235 07 27 08.3 +09 16 40 12.1 1.0 11.4 0.8 SPV P ~ 0.2 d ?
GSC 0764 2609 07 29 43.3 +07 37 57 11.3 0.4 8.8 0.2 SPV:
GSC 0820 0259 09 24 29.8 +09 10 18 10.7 0.3 10.3 0.3 SPV: / ecl:
Notes:
LPV = Long Period Variable SPV = Short Period Variable (usually < 2 d or << 2d) ecl = eclipser P = Period d = day : denotes uncertainty = preceeds cross identities