Variable Stars

Introduction

Variable Stars are the bane of my Minor Planet lightcurve work. I pick comp stars for my reductions only to find that the comp star I have chosen is variable so I have to repeat the reduction work all over again with a new star. The bonus, of course, is that I may well have discovered a new variable star in the process. Of course these 'new' discoveries are reported and are in need of follow-up work to determine their spectral type, likely variable type and an accurate measurement of the objects magnitude. Typically this will require filtered observations and all sky photometry.

On the nights that are not suited to Minor Planet Photometry I also undertake observations of Variable stars that the AAVSO report as in need of observations (those objects that have little or no coverage) Typically I can completed about 50 stars in a night which covers off most of those 'in need' targets that are visible to me at any given time.

Discovery of Variable Stars

3UCAC 138-414158 Date: 17 July 2010 Period: 8.5 + 0.5hrs Min Magnitude & Amplitude: 13.62 (A=0.08)mag J2000 RA:19:22:42.1 DEC:-21:07:28.1 (J2000) Type: Suspected Eclipsing Binary Star	Reported to VSX: 17 July 2010 - VSX J192242.1-210728 Published: AAVSO UID: 000-BJV-888 Additional data taken indicating many period fits in the 8hr band. More data required to nail it down.
3UCAC 157-133092 Date: 12 May 2010 Period: 9.2 + 0.1hrs Min Magnitude & Amplitude: 13.00 (A=0.50)mag J2000 RA:14:05:16.25 DEC:-11:33:13.7 (J2000) Type: Suspected Eclipsing Binary Star B-V: 0.473 V-R: 0.279	Reported to VSX: Not a Discovery - known ASAS Variable Known: ASAS J140516-1133.2 000-BHB-303 Type: RRC Period: 0.372035
GSC 06140-00444 Date: 16 April 2009 Period: 0.458943 + 0.000002days Min Magnitude & Amplitude: 12.9 (0.22)mag J2000 RA:13:58:06.2 DEC:-18:05:48.2 Type: Suspected Eclipsing Binary Star of type Eb	Reported to VSX: 16 April 2009 Merged with ASAS data from 2000.12.24 to 2009.04.17 (left). The ASAS data is somewhat noisy! Published
NSV 19792 Date: 03 May 2008 Period: 14.2 + 0.2hrs Min Magnitude & Amplitude: 12.7 (0.25)mag J2000 RA:13:25:49.75 DEC:-08:50:23.3 Type: Unknown	Reported to VSX: 05 May 2008 Published
UCAC2 31006803 Date: 16 February 2008 Period: 0.32762 + 0.00002d 8.301 + 0.003hrs Min Magnitude & Amplitude: 14.2 (0.6)mag J2000 RA:09:49:39.57 DEC:-02:06:55.9 Type: Suspected Eclipsing Binary	Reported to VSX: 18 February 2008 (VSX J094939.5-020655) Published
GSC 00032-00882 Date:04 October 2007 Period:0.40307 + 0.00006d 9.6738 + 0.0015hrs Min Magnitude & Amplitude: 13.5 J2000 RA:01:49:21.0 DEC:+04:59:35.0 Type: Suspected Eclipsing Binary	Reported to VSX: 04 October 2007 (000-BCY-385) Published
GSC 05051-00119 Date:10 June 2007 Period:0.49167 + 0.0002d 11.799 + 0.002hrs Min Magnitude & Amplitude: 13.5 J2000 RA:16:52:34.31 DEC:-00:48:33.4 Type: Suspected Eclipsing Binary	Reported to VSX: 13 June 2007 Published
GSC 06186-01594 Date:15 April 2007 Period:0.419 + 0.042d 10.06 + 1hrs Min Magnitude & Amplitude: 12.8 (0.14) J2000 RA:15:50:45.8 DEC:-16:49:01.9 Vmag 13.429, (B-V) 0.577, (U-B) 0.055, (V-R) 0.353, (Rc-Ic) 0.351, (V-Ic) 0.701 Type*: Suspected Eclipsing Binary of type W Uma	Reported to VSX: 17 April 2007 Published * Photometry performed by Arne Henden, Flagstaff
GSC 00252-00080 Date:07 April 2007 Period:0.2346208 + 0.0000125d 5.6309 + 0.0003hrs Min Magnitude & Amplitude: 13.72 (0.84) J2000 RA:10:20:04.61 DEC:+06:49:29.1 Type: Suspected Eclipsing Binary	Reported to VSX: 08 April 2007 Published
GSC 05802-00929 Date:26 July 2006 Period:0.34260 + 0.000021d 8.2224 + 0.0005hrs Min Magnitude & Amplitude: 14.922 (0.45) J2000 RA:22:02:16.76 DEC:-08:11:24.6 Type: Suspected Eclipsing Binary	Reported to VSX: 27 July 2006 Published here
GSC 05740-02196 Date:08 July 2006 Period:0.34730 + 0.00002d 8.3353 + 0.0005hrs Min Magnitude & Amplitude: 14.531 (0.60) J2000 RA:20:10:40.13 DEC:-07:32:41.36 Type: Suspected Eclipsing Binary	Reported to VSX: 28 July 2006 Published here
USNO A2_0750_21069256 Date:26 July 2006 Period:?? + ?d Max Magnitude & Amplitude: 16.7 (0.5)* J2000 RA:22:01:51.99 DEC:-08:14:26.5 Type: Unknown	Reported to VSX: Not reported
USNO A2_0750_19743847 Date:08 July 2006 Period:?? + ?d Max Magnitude & Amplitude: 15.9 (0.6)* J2000 RA:20:10:08.54 DEC:-07:39:24.58 Type: Possible Eclipsing Binary	Reported to VSX: Not reported

* Derived from UCAC 2 catalogue photometry and Clear filter

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